UNITED STATES LIME & MINERALS INC
10-Q, 1999-08-11
MINING & QUARRYING OF NONMETALLIC MINERALS (NO FUELS)
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<PAGE>   1
                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    Form 10-Q
(Mark One)

[X]           QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF
                       THE SECURITIES EXCHANGE ACT OF 1934

                  For the quarterly period ended JUNE 30, 1999

                                       OR

[ ]               TRANSITION REPORT PURSUANT TO SECTION 13 OR
                  15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

               For the transition period from          to
                                              ---------  ---------

                       Commission file number is 000-4197


                       UNITED STATES LIME & MINERALS, INC.
             ------------------------------------------------------
             (Exact name of registrant as specified in its charter)


            TEXAS                                                75-0789226
- -------------------------------                              -------------------
(State or other jurisdiction of                               (I.R.S. Employer
incorporation or organization)                               Identification No.)


                13800 MONTFORT DRIVE, SUITE 330, DALLAS, TX 75240
               ---------------------------------------------------
               (Address of principal executive offices) (Zip Code)


                                 (972) 991-8400
                                 --------------
              (Registrant's telephone number, including area code)


                 12221 MERIT DRIVE, SUITE 500, DALLAS, TX    75251
             -------------------------------------------------------
            (Former address of principal executive offices)(Zip Code)


Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days.

         Yes  X   No
            ----    ----

Indicate the number of shares outstanding of each of the issuer's classes of
common stock, as of the latest practicable date: As of August 10, 1999,
3,981,664 shares of common stock, $0.10 par value, were outstanding.



<PAGE>   2


PART I.           FINANCIAL INFORMATION
ITEM 1:           FINANCIAL STATEMENTS

UNITED STATES LIME & MINERALS, INC. AND SUBSIDIARIES
CONDENSED CONSOLIDATED BALANCE SHEETS
(In thousands of dollars)

<TABLE>
<CAPTION>

                                                             JUNE 30,      DECEMBER 31,
                                                              1999            1998
                                                          ------------    ------------
ASSETS                                                     (Unaudited)      (Audited)
<S>                                                       <C>             <C>
Current assets:
  Cash and cash equivalents                               $      7,977    $        688
  Trade receivables, net                                         4,242           3,360
  Inventories                                                    3,739           3,154
  Prepaid expenses and other assets                                107             139
                                                          ------------    ------------
     Total current assets                                       16,065           7,341

Property, plant and equipment at cost:                          76,273          73,228
  Less accumulated depreciation and depletion                  (34,151)        (32,152)
                                                          ------------    ------------
  Property, plant and equipment, net                            42,122          41,076

Deferred tax assets, net                                         2,136           2,465
Other assets, net                                                1,259             208
                                                          ------------    ------------

     Total assets                                         $     61,582    $     51,090
                                                          ============    ============


LIABILITIES AND STOCKHOLDERS' EQUITY
 Current liabilities:
  Current installments of long-term debt                  $        833    $      2,643
  Accounts payable                                               2,167           3,668
  Accrued expenses                                               1,586           1,666
                                                          ------------    ------------
     Total current liabilities                                   4,586           7,977

Long-term debt, excluding current installments                  29,167          16,196
Other liabilities                                                  462             253
                                                          ------------    ------------
      Total liabilities                                         34,215          24,426

Stockholders' equity:
  Common stock                                                     529             529
Additional paid-in capital                                      14,819          14,866
  Retained earnings                                             25,946          25,243
                                                          ------------    ------------
                                                                41,294          40,638
Less treasury stock at cost; 1,312,401 and
  1,316,876 shares of common stock, respectively               (13,927)        (13,974)
                                                          ------------    ------------
     Total stockholders' equity                                 27,367          26,664
                                                          ------------    ------------

     Total liabilities and stockholders' equity           $     61,582    $     51,090
                                                          ============    ============
</TABLE>

     See accompanying notes to condensed consolidated financial statements.


                                       2

<PAGE>   3



UNITED STATES LIME & MINERALS, INC. AND SUBSIDIARIES
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
(In thousands of dollars, except per share data)
(Unaudited)

<TABLE>
<CAPTION>

                                                     THREE MONTHS ENDED                            SIX MONTHS ENDED
                                                          JUNE 30,                                      JUNE 30,
                                       --------------------------------------------   --------------------------------------------
                                              1999                     1998                  1999                     1998
                                       -------------------     --------------------   -------------------     --------------------

<S>                                    <C>        <C>        <C>          <C>         <C>       <C>          <C>         <C>
REVENUES                               $  7,613      100.0%    $  8,016       100.0%  $ 14,544      100.0%      14,485       100.0%

Cost of revenues:
  Labor and other operating expenses      4,487       58.9%       5,153        64.3%     8,468       58.2%       9,680        66.8%
  Depreciation, depletion and
      amortization                        1,094       14.4%         694         8.6%     2,167       14.9%       1,360         9.4%
                                       --------   --------     --------    --------   --------   --------     --------    --------
                                          5,581       73.3%       5,847        72.9%    10,635       73.1%      11,040        76.2%
                                       --------   --------     --------    --------   --------   --------     --------    --------

GROSS PROFIT                              2,032       26.7%       2,169        27.1%     3,909       26.9%       3,445        23.8%

  Selling, general & administrative
      expenses                              887       11.7%         917        11.5%     1,805       12.4%       1,843        12.7%
                                       --------   --------     --------    --------   --------   --------     --------    --------

OPERATING PROFIT                          1,145       15.0%       1,252        15.6%     2,104       14.5%       1,602        11.1%

  Other deductions (income):
    Interest expense                        691        9.1%           3         0.0%     1,034        7.1%           6         0.0%
    Other income, net                      (121)      (1.6%)       (201)       (2.5%)     (132)      (0.9%)       (275)       (1.8%)
                                       --------   --------     --------    --------   --------   --------     --------    --------
                                            570        7.5%        (198)       (2.5%)      901        6.2%        (269)       (1.8%)
                                       --------   --------     --------    --------   --------   --------     --------    --------

INCOME BEFORE
      INCOME TAXES                          575        7.5%       1,450        18.1%     1,203        8.3%       1,871        12.9%
                                       --------   --------     --------    --------   --------   --------     --------    --------

Income taxes                                131        1.7%         387         4.8%       301        2.1%         505         3.5%
                                       --------   --------     --------    --------   --------   --------     --------    --------

  NET INCOME                           $    444        5.8%    $  1,063        13.3%  $    902        6.2%    $  1,366         9.4%
                                       ========   ========     ========    ========   ========   ========     ========    ========


INCOME PER SHARE
     OF COMMON STOCK:
          Basic                        $   0.11                $   0.27               $   0.23               $   0.34
                                       ========                ========               ========               ========

          Diluted                      $   0.11                $   0.27               $   0.23               $   0.34
                                       ========                ========               ========               ========
</TABLE>






     See accompanying notes to condensed consolidated financial statements.



                                       3

<PAGE>   4



UNITED STATES LIME & MINERALS, INC. AND SUBSIDIARIES
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(In thousands of dollars)
(Unaudited)

<TABLE>
<CAPTION>

                                                                       SIX MONTHS ENDED
                                                                          JUNE 30,
                                                                 ------------------------
                                                                    1999          1998
                                                                 ----------    ----------

OPERATING ACTIVITIES:
<S>                                                              <C>           <C>
  Net income                                                     $      902    $    1,366
  Adjustments to reconcile net income to net cash
        provided by (used in) operating activities:
     Depreciation, depletion and amortization                         2,249         1,419
     Deferred income tax benefit                                        329            72
     Amortization of financing costs                                     29            --
     Loss (gain) on sale of property, plant and equipment                (3)           32
     Current assets, net change[1]                                   (1,435)         (658)
     Other assets                                                    (1,080)           23
     Current liabilities, net change[2]                              (1,581)       (1,305)
     Other liabilities                                                  209           152
                                                                 ----------    ----------
     Net cash provided by (used in) operating activities               (381)        1,101

INVESTING ACTIVITIES:
  Purchase of property, plant and equipment                          (3,320)      (11,700)
  Proceeds from sale of property, plant and equipment                    28             3
                                                                 ----------    ----------
     Net cash used in investing activities                           (3,292)      (11,697)

FINANCING ACTIVITIES:
  Payment of common stock dividends                                    (199)         (198)
  Proceeds from borrowings on term loan                              30,000        11,000
  Principal payments on term loan                                   (17,839)          (95)
  Proceeds from borrowing on revolving credit facility                2,000            --
  Principal payments on revolving credit facility                    (3,000)           --
                                                                 ----------    ----------
     Net cash provided by financing activities                       10,962        10,707
                                                                 ----------    ----------

  Net increase in cash                                                7,289           111
     Cash at beginning of period                                        688         2,787
                                                                 ----------    ----------

     Cash at end of period                                       $    7,977    $    2,898
                                                                 ==========    ==========


  Supplemental cash flow information:
     Interest paid                                               $    1,005    $      326
                                                                 ==========    ==========

     Income taxes paid                                           $      164    $      437
                                                                 ==========    ==========
</TABLE>


[1] Exclusive of net change in cash
[2] Exclusive of net change in current portion of debt



     See accompanying notes to condensed consolidated financial statements.


                                       4

<PAGE>   5



              UNITED STATES LIME & MINERALS, INC. AND SUBSIDIARIES

              Notes to Condensed Consolidated Financial Statements
                                   (Unaudited)




1.   Basis of Presentation

     The condensed consolidated financial statements included herein have been
     prepared by the Company without independent audit. In the opinion of the
     Company's management, all adjustments of a normal and recurring nature
     necessary to present fairly the financial position, results of operations
     and cash flows for the periods presented have been made. Certain
     information and footnote disclosures normally included in financial
     statements prepared in accordance with generally accepted accounting
     principles have been condensed or omitted. It is suggested that these
     condensed consolidated financial statements be read in conjunction with the
     consolidated financial statements and notes thereto included in the
     Company's Annual Report on Form 10-K for the period ended December 31,
     1998. The results of operations for the three-month and six-month periods
     ended June 30, 1999 are not necessarily indicative of operating results for
     the full year.


2.   Inventories

<TABLE>
<CAPTION>

     Inventories consisted of the following at:
            (In thousands of dollars)                       JUNE 30,         DECEMBER 31,
                                                             1999              1998
                                                       ---------------   ---------------

<S>                                                    <C>               <C>
            Lime and limestone inventories:
                Raw materials                          $           945   $           927
                Finished goods                                   1,083               671
                                                       ---------------   ---------------
                                                                 2,028             1,598
            Service parts                                        1,711             1,556
                                                       ---------------   ---------------
                   Total inventories                   $         3,739   $         3,154
                                                       ===============   ===============
</TABLE>

3.   Long-Term Debt

     On April 22, 1999, the Company entered into a new credit agreement with a
     consortium of commercial banks for a $50,000,000 Senior Secured Term Loan
     (the "Loan"). The Loan is repayable over a period of approximately 8 years,
     maturing on March 30, 2007, and requires monthly principal payments of
     $277,777.78 beginning April 30, 2000, with a final principal payment of
     $26,944,444.26 on March 30, 2007, which equates to a 15-year amortization.

     The Company agreed to pay a fee equivalent to 2-1/2% of the Loan value to
     the placement agent. The fee due on the first $30,000,000 advanced was paid
     on closing, and the fee due on the remaining $20,000,000 will become
     payable when the first installment of this portion is funded.

     Upon execution of the Loan agreement, the first $30,000,000 was advanced,
     of which approximately $20,000,000 was used to retire all existing bank
     loans, with the balance to be used primarily for the modernization and
     expansion of the Arkansas operations. Under the terms of the Loan
     agreement, the remaining $20,000,000 of the Loan facility could be drawn
     down in four equal quarterly installments beginning June 30, 1999, and
     ending March 30, 2000, and will be used exclusively for the Arkansas
     project. Commencement of the draw down of the quarterly installments is
     conditional upon the Company receiving an operating air permit for the
     first phase






                                       5

<PAGE>   6


     of the Arkansas project by December 31, 1999. On June 22, 1999, the Company
     exercised its option to defer the first quarterly installment available on
     June 30, 1999, as the Company was still in negotiations for the operating
     air permit. In the event that the Company does not receive the operating
     air permit by December 31, 1999, and is unable to draw down the final
     $20,000,000 of installments, a break fee of 0.25% will be payable to the
     lenders.

     As of April 22, 1999, the Company also entered into a second amendment of
     its amended and restated loan and security agreement with the lead bank
     which provides for a $4,000,000 revolving credit facility. The current
     agreement contains essentially the same terms as the previous agreement and
     has a maturity date of April 21, 2000.

     The Loan is secured by a first lien on substantially all of the Company's
     assets, with the exception of accounts receivable and inventories which
     have been used to secure the amended $4,000,000 revolving credit facility.
     The interest rate on the first $30,000,000 of the Loan is 8-7/8%, and
     subsequent installment draw downs will bear interest from the date they are
     funded at 3.52% above the secondary market yield of the United States
     Treasury obligation maturing May 15, 2005. The revolving credit facility
     bears interest at LIBOR plus 1.40%, which rate will increase in accordance
     with a defined rate spread based upon the Company's then-current ratio of
     total funded debt to earnings before interest, taxes, depreciation and
     amortization (EBITDA).

     In connection with the repayment of the prior term loan, the Company
     terminated an interest rate protection agreement which it had entered into
     with its bank to modify the interest characteristics of $9,000,000 of its
     then outstanding term debt from a variable to a fixed rate (the "Swap
     Agreement"). As a result of the termination of the Swap Agreement, the
     Company was obligated to pay the bank a $102,000 termination payment, which
     was expensed in the second quarter as an adjustment to interest expense.

     The Loan agreement contains covenants that restrict the incurrence of debt,
     guaranties and liens, and places certain restrictions on the payment of
     dividends and the sale of significant assets. The Company is also required
     to meet minimum debt service coverage ratios on an on-going basis and
     maintain a minimum level of tangible net worth.


     A summary of outstanding debt at the dates indicated is as follows:
            (In thousands of dollars)

<TABLE>
<CAPTION>

                                                                   JUNE 30,              DECEMBER 31,
                                                                     1999                    1998
                                                                  ----------             -----------

<S>                                                               <C>                    <C>
              Term loan                                           $   30,000             $   17,839
              Revolving credit facility                                    -                  1,000
                                                                  ----------             ----------
              Subtotal                                                30,000                 18,839

              Less current installments and
                    revolving credit facility                            833                  2,643
                                                                  ----------             ----------
              Long-term debt, excluding current
                  installments                                    $   29,167             $   16,196
                                                                  ==========             ==========
</TABLE>

The carrying amount of the Company's long-term debt approximates its fair value.


                                       6

<PAGE>   7



ITEM 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
         RESULTS OF OPERATIONS


LIQUIDITY AND CAPITAL RESOURCES

Net cash used in operating activities was $381,000 for the six months ended June
30, 1999, as compared to $1,101,000 provided by operating activities for the six
months ended June 30, 1998. The main reason for the decrease in cash from
operating activities was the slower collection of accounts receivable.

The Company invested $3,320,000 in capital expenditures in the first six months
of 1999, of which $2,099,000 related to the Texas facility. This compared to
$11,700,000 in the same period last year, of which $10,022,000 was related to
the modernization and expansion project at the Texas facility. The Texas project
was completed in the fourth quarter of 1998.

In June 1999, the Company purchased the plant and equipment assets of Calco,
Inc. in Salida, Colorado, together with all finished product inventories. Calco,
Inc. produces pulverized limestone products in bagged and bulk form, and the
plant facilities also include a dormant lime kiln. In 1998, the Calco business
had revenues of approximately $1,000,000.

As currently planned, the Arkansas modernization and expansion project will be
completed in two phases: Phase I will cover the redevelopment of the quarry
plant, rebuilding of the railroad, establishment of an out-of-state terminal,
and installation of a rotary kiln with a preheater, along with increased product
storage and loading capacity. Depending on such factors as securing satisfactory
permits, Phase I is scheduled to be completed mid-year 2000.

Phase II of the Arkansas project would further expand the plant capacity through
the installation of a second kiln with additional storage capacity. Although the
Company could determine to defer Phase II depending upon such factors as market
demand and the availability of financing, it currently plans to complete Phase
II in the first half of 2001.

The Arkansas improvements should allow the Company to better serve its customers
by improving both quality and service while increasing the production capacity
of quicklime and hydrated lime. With the improvements, the Company expects to be
in a better position to compete for customers who currently cannot use the
Company's lime in their processes due to insufficient production capacity at the
plant or quality constraints. The rotary kiln will have lower operating costs
and a greater capacity than the six shaft kilns currently in use. In addition to
increasing capacity, this kiln will also be able to consistently produce
high-quality lime for use by certain manufacturing customers who currently do
not buy lime from the Arkansas facility. The storage, screening, and load-out
facilities will also substantially reduce the amount of time required for the
loading of bulk quicklime trucks and railcars. The planned modernization and
expansion project will increase both production and shipping capacity, will
lower operating costs, and will allow for a more efficient utilization of the
work force.

Phase I of the Arkansas project is currently projected to cost approximately
$21,500,000. If Phase II proceeds on schedule, it is currently estimated to cost
approximately $11,000,000. The Company intends to finance the Arkansas project
through a combination of internally generated funds and bank borrowings. There
can be no assurance that sufficient funds will be available to the Company to
complete Phase II of the Arkansas project as currently contemplated.

The Company is not contractually committed to any planned capital expenditures
until actual orders are placed for equipment. As of June 30, 1999, the Company
had no liability for open equipment and

                                       7

<PAGE>   8


construction orders. All future billings related to the Arkansas modernization
and expansion project will be recorded as work is performed and billed to the
Company.

On April 22, 1999, the Company entered into a new credit agreement with a
consortium of commercial banks for a $50,000,000 Senior Secured Term Loan (the
"Loan"). The Loan is repayable over a period of approximately 8 years, maturing
on March 30, 2007, and requires monthly principal payments of $277,777.78
beginning April 30, 2000, with a final principal payment of $26,944,444.26 on
March 30, 2007, which equates to a 15-year amortization.

The Company agreed to pay a fee equivalent to 2-1/2% of the Loan value to the
placement agent. The fee due on the first $30,000,000 advanced was paid on
closing, and the fee due on the remaining $20,000,000 will become payable when
the first installment of this portion is funded.

Upon execution of the Loan agreement, the first $30,000,000 was advanced, of
which approximately $20,000,000 was used to retire all existing bank loans, with
the balance to be used primarily for the modernization and expansion of the
Arkansas operations. Under the terms of the Loan agreement, the remaining
$20,000,000 of the Loan facility could be drawn down in four equal quarterly
installments beginning June 30, 1999, and ending March 30, 2000, and will be
used exclusively for the Arkansas project. Commencement of the draw down of the
quarterly installments is conditional upon the Company receiving an operating
air permit for the first phase of the Arkansas project by December 31, 1999. On
June 22, 1999, the Company exercised its option to defer the first quarterly
installment available on June 30, 1999, as the Company was still in negotiations
for the operating air permit. In the event that the Company does not receive the
operating air permit by December 31, 1999, and is unable to draw down the final
$20,000,000 of installments, a break fee of 0.25% will be payable to the
lenders.

As of April 22, 1999, the Company also entered into a second amendment of its
amended and restated loan and security agreement with the lead bank which
provides for a $4,000,000 revolving credit facility. The current agreement
contains essentially the same terms as the previous agreement and has a maturity
date of April 21, 2000.

The Loan is secured by a first lien on substantially all of the Company's
assets, with the exception of accounts receivable and inventories which have
been used to secure the amended $4,000,000 revolving credit facility. The
interest rate on the first $30,000,000 of the Loan is 8-7/8%, and subsequent
installment draw downs will bear interest from the date they are funded at 3.52%
above the secondary market yield of the United States Treasury obligation
maturing May 15, 2005. The revolving credit facility bears interest at LIBOR
plus 1.40%, which rate will increase in accordance with a defined rate spread
based upon the Company's then-current ratio of total funded debt to earnings
before interest, taxes, depreciation and amortization (EBITDA).

In connection with the repayment of the prior term loan, the Company terminated
an interest rate protection agreement which it had entered into with its bank to
modify the interest characteristics of $9,000,000 of its then outstanding term
debt from a variable to a fixed rate (the "Swap Agreement"). As a result of the
termination of the Swap Agreement, the Company was obligated to pay the bank a
$102,000 termination payment, which was expensed in the second quarter as an
adjustment to interest expense.

The Loan agreement contains covenants that restrict the incurrence of debt,
guaranties and liens, and places certain restrictions on the payment of
dividends and the sale of significant assets. The Company is also required to
meet minimum debt service coverage ratios on an on-going basis and maintain a
minimum level of tangible net worth.

As of June 30, 1999, the Company had approximately $30,000,000 in total debt
outstanding.



                                       8

<PAGE>   9


RESULTS OF OPERATIONS

Revenues were $7,613,000 in the second quarter of 1999, a decrease of $403,000,
or 5.0%, from the revenues of $8,016,000 in the second quarter of 1998. This
resulted from an 8.8% decrease in sales volume and a 3.8% increase in prices.
While demand and pricing remain strong in both the Arkansas and Texas markets,
sales volumes were slowed due to the adverse effect of heavy rainfall in the
second quarter. Revenues for the six months ended June 30, 1999 were
$14,544,000, an increase of $59,000, or 0.4%, from the $14,485,000 reported for
the six months ended June 30, 1998.
The increase resulted from a 0.8% decrease in volume and a 1.2% increase in
prices.

The Company's gross profit was $2,032,000 for the second quarter of 1999,
compared to $2,169,000 for the second quarter of 1998, a 6.3% decrease. Gross
profit margin as a percentage of revenues for the second quarter of 1999
decreased slightly to 26.7%, from 27.1% in 1998. In the second quarter, gross
profit and gross profit margins were impacted by the lower sales volumes due to
the inclement weather. Gross profit increased to $3,909,000 for the first six
months of 1999, from $3,445,000 for the first six months of 1998, a 13.5%
increase. Gross profit margin for the six months ended June 30, 1999 increased
to 26.9%, from 23.8% in 1998.

Selling, general and administrative expenses ("SG&A") decreased by $30,000, or
3.3%, to $887,000 in the second quarter of 1999, as compared to $917,000 in the
second quarter of 1998. SG&A as a percentage of sales increased marginally to
11.7%, from 11.5% a year earlier. SG&A decreased by $38,000, or 2.1%, to
$1,805,000 in the first six months of 1999, as compared to $1,843,000 in the
first six months of 1998, and as a percentage of sales decreased marginally to
12.4% from 12.7%.

Interest expense in the second quarter of 1999 was $691,000, as compared to
$3,000 in 1998. Interest expense for the first six months of 1999 was
$1,034,000, as compared to $6,000 in 1998. The 1999 increase was attributable to
a higher debt balance and miscellaneous additional interest expense, including a
$102,000 termination payment in connection with the Company's termination of the
Swap Agreement, which amount was expensed in the second quarter 1999. In 1998,
substantially all incurred interest costs were capitalized as part of the Texas
modernization and expansion project. Interest costs of approximately $204,000
and $305,000 were capitalized in the second quarter and first six months,
respectively, of 1998.

The Company reported net income of $444,000 ($0.11 per share) during the second
quarter of 1999, compared to net income of $1,063,000 ($0.27 per share) during
the second quarter of 1998. For the first six months of 1999, the Company
reported net income of $902,000 ($0.23 per share), compared to net income of
$1,366,000 ($0.34 per share) in the first six months of 1998.


EBITDA (earnings before interest, taxes, depreciation and amortization) was
$2,430,000 for the second quarter of 1999, an increase of 11.2% from the second
quarter 1998 of $2,185,000. For the six months ended June 30, 1999, EBITDA was
$4,513,000, an increase of 36.9% from the $3,296,000 generated in the same
period of 1998.


YEAR 2000 COMPLIANCE

The Company continues to address the potential impact of the Year 2000 ("Y2K")
issue on its operations. The Y2K problem arises because of computer programs
which use two digits rather than four digits to define a year. This may result
in miscalculations or complete system failures in processing data with programs
using date sensitive information.

The Company has inventoried its information technology ("IT") and non-IT
systems, including embedded systems in its production operating equipment, in an
effort to identify potential Y2K problems. The Company has begun to resolve the
problems uncovered and has moved to the

                                       9

<PAGE>   10


remediation and testing phases of its Y2K compliance program, which it expects
to complete by the third quarter of 1999.

The Company has been using certain customized accounting software which is not
Y2K compliant. To address this problem, the Company has selected, and is in the
process of installing, a commercially available accounting software which is Y2K
compliant. The cost of this installation is approximately $200,000, and the
Company expects to complete the change to the new system during the third
quarter of 1999.

The Company is in the process of obtaining confirmation from its suppliers and
customers that they are or will be Y2K compliant. The cost of replacing, or of
implementing alternative means of communication with, non-compliant or
non-responsive suppliers will not be possible to determine until the review
process has been completed.

Other than as a result of serious systemic failures in external services, or due
to a significant and extended decline in customer demand as a result of an
inadequate response to the Y2K problem by the Company's customers and their
industries, the Company does not expect the Y2K challenge to have a material
adverse effect on its financial condition, results of operations, or cash flows.

FORWARD-LOOKING STATEMENTS. Any statements contained in this Quarterly Report
that are not statements of historical fact are forward-looking statements as
defined in the Private Securities Litigation Reform Act of 1995. Forward-looking
statements in this Report, including without limitation, statements relating to
the Company's plans, strategies, objectives, expectations, intentions, and
adequacy of resources, are identified by such words as "will," "could,"
"should," "believe," "expect," "intend," "plan," "schedule," "estimate," and
"project." The Company undertakes no obligation to publicly update or revise any
forward-looking statements. Investors are cautioned that forward-looking
statements involve risks and uncertainties that could cause actual results to
differ materially from expectations, including without limitation the following:
(i) the Company's plans, strategies, objectives, expectations, and intentions
are subject to change at any time at the discretion of the Company; (ii) the
Company's plans and results of operations will be affected by the Company's
ability to manage its growth and modernization; and (iii) other risks and
uncertainties, including without limitation, those risks and uncertainties
indicated from time to time in the Company's filings with the Securities and
Exchange Commission, including the Company's Form 10-K for the fiscal year ended
December 31, 1998.

ITEM 3.  QUANTITATIVE AND QUALITATIVE DISCLOSURE ABOUT MARKET RISK

Not applicable.

                                       10

<PAGE>   11



PART II. OTHER INFORMATION

ITEM 4:  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS


         The Annual Meeting of Shareholders was held on April 20, 1999 in
         Dallas, Texas. The tables below show the two proposals submitted to
         shareholders in the Company's Proxy Statement, dated March 26, 1999,
         and the results of the shareholders vote:

         4.1    Election of Directors

<TABLE>
<CAPTION>
                                                                  FOR                     WITHHELD
                                                                ---------                 --------

<S>                                                             <C>                        <C>
                  John J. Brown                                 3,594,468                  70,481
                  Timothy W. Byrne                              3,615,776                  49,173
                  Richard W. Cardin                             3,596,380                  68,569
                  Antoine M. Doumet                             3,613,720                  51,229
                  Wallace G. Irmscher                           3,596,380                  68,569
                  Edward A. Odishaw                             3,596,380                  68,569
                  Herbert G.A. Wilson                           3,615,980                  48,969
</TABLE>

         There were no broker non-votes.

4.2      Amendment and Restatement of the 1992 Stock Option Plan

           FOR                       AGAINST              ABSTENTIONS

         3,439,136                   220,933                  4,880

         There were no broker non-votes.


ITEM 6:  EXHIBITS AND REPORTS ON FORM 8-K

              a.  Exhibits:

                  10(a)    Credit Agreement, dated April 22, 1999, among United
                           States Lime & Minerals, Inc., Arkansas Lime Company,
                           Texas Lime Company, the Lenders who are, or may
                           become, a party to this Agreement, and First Union
                           National Bank

                  10(b)    Second Amendment to Amended and Restated Loan and
                           Security Agreement, dated as of April 22, 1999, among
                           United States Lime & Minerals, Inc., Arkansas Lime
                           Company, Texas Lime Company, and First Union National
                           Bank

                  10(c)    1992 Stock Option Plan as Amended and Restated

                  11       Statement re computation of per share earnings

                  27       Financial Data Schedule



              b.  Reports on Form 8-K:

                  On June 16, 1999, the Company filed a Current Report on Form
                  8-K reporting under Items 5 and 7, the purchase, of the plant
                  and equipment assets of Calco, Inc., together with all
                  finished product inventories.



                                       11
<PAGE>   12




                                   SIGNATURES


Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.

                            UNITED STATES LIME & MINERALS, INC.






August 10, 1999             By:   /s/  Herbert G.A. Wilson
                                 -----------------------------------------------
                                 Herbert G.A. Wilson
                                 President and Chief Executive Officer
                                 (Principal Executive Officer)





August 10, 1999             By:   /s/  Larry T. Ohms
                                 -----------------------------------------------
                                 Larry T. Ohms
                                 Corporate Controller and Treasurer
                                 (Principal Financial and Accounting Officer)


                                       12

<PAGE>   13





                       UNITED STATES LIME & MINERALS, INC.



                          Quarterly Report on Form 10-Q
                                  Quarter Ended
                                  June 30, 1999

                                INDEX TO EXHIBITS


<TABLE>
<CAPTION>

  EXHIBIT NO.               DESCRIPTION
  -----------               -----------
<S>            <C>
     10(a)     Credit Agreement, dated April 22, 1999, among United States Lime
               & Minerals, Inc., Arkansas Lime Company, Texas Lime Company, the
               Lenders who are, or may become, a party to this Agreement, and
               First Union National Bank

     10(b)     Second Amendment to Amended and Restated Loan and Security
               Agreement, dated as of April 22, 1999, among United States Lime &
               Minerals, Inc., Arkansas Lime Company, Texas Lime Company, and
               First Union National Bank

     10(c)     1992 Stock Option Plan as Amended and Restated

     11        Statement re computation of per share earnings

     27        Financial Data Schedule
</TABLE>


                                      E-1


<PAGE>   1
                                                                   EXHIBIT 10(a)


================================================================================




                                CREDIT AGREEMENT



                           dated as of April 22, 1999



                                  by and among

                       UNITED STATES LIME & MINERALS, INC.
                               TEXAS LIME COMPANY
                              ARKANSAS LIME COMPANY



                                  as Borrowers,



                         the Lenders referred to herein,



                                       and



                           FIRST UNION NATIONAL BANK,

                             as Administrative Agent




================================================================================


<PAGE>   2


                                TABLE OF CONTENTS


<TABLE>
<S>                                                                                                             <C>
ARTICLE I  DEFINITIONS............................................................................................1
         SECTION 1.1  Definitions.................................................................................1
         SECTION 1.2  General....................................................................................11
         SECTION 1.3  Other Definitions and Provisions...........................................................11

ARTICLE II  LOAN FACILITY........................................................................................12
         SECTION 2.1  Loans......................................................................................12
         SECTION 2.2  Procedure for Loan Fundings................................................................12
         SECTION 2.3  Repayment of Loans.........................................................................14
         SECTION 2.4  Notes......................................................................................14
         SECTION 2.5  Termination of Loan Facility...............................................................15
         SECTION 2.6  Use of Proceeds............................................................................15
         SECTION 2.7  Charging Deposit Accounts..................................................................15

ARTICLE III  GENERAL LOAN PROVISIONS.............................................................................15
         SECTION 3.1  Interest...................................................................................15
         SECTION 3.2  Agent's Fee................................................................................16
         SECTION 3.3  Manner of Payment..........................................................................16
         SECTION 3.4  Crediting of Payments and Proceeds.........................................................17
         SECTION 3.5  Adjustments................................................................................17
         SECTION 3.6  Nature of Obligations of Lenders Regarding Extensions of Credit; Assumption by the
                      Administrative Agent.......................................................................18
         SECTION 3.7  Changed Circumstances......................................................................18
         SECTION 3.8  Capital Requirements.......................................................................19
         SECTION 3.9  Duty to Mitigate; Assignment of Pro Rata Shares............................................19
         SECTION 3.10 Security...................................................................................20

ARTICLE IV  CLOSING; CONDITIONS OF CLOSING AND BORROWING.........................................................21
         SECTION 4.1  Closing....................................................................................21
         SECTION 4.2  Conditions to Closing and Initial Extensions of Credit.....................................21
         SECTION 4.3  Conditions to All Extensions of Credit.....................................................24

ARTICLE V  REPRESENTATIONS AND WARRANTIES OF THE BORROWER........................................................25
         SECTION 5.1  Representations and Warranties.............................................................25
         SECTION 5.2  Survival of Representations and Warranties, Etc............................................32

ARTICLE VI  FINANCIAL INFORMATION AND NOTICES....................................................................32
         SECTION 6.1  Financial Statements and Projections.......................................................32
         SECTION 6.2  Officer's Compliance Certificate...........................................................33
         SECTION 6.3  Accountants' Certificate...................................................................33
         SECTION 6.4  Other Reports..............................................................................34
         SECTION 6.5. Notice of Litigation and Other Matters.....................................................34
</TABLE>



                                      (i)
<PAGE>   3

<TABLE>
<S>                                                                                                             <C>
         SECTION 6.6  Accuracy of Information....................................................................35

ARTICLE VII  AFFIRMATIVE COVENANTS...............................................................................35
         SECTION 7.1  Preservation of Corporate Existence and Related Matters....................................35
         SECTION 7.2  Maintenance of Property....................................................................35
         SECTION 7.3  Insurance..................................................................................36
         SECTION 7.4  Accounting Methods and Financial Records...................................................36
         SECTION 7.5  Payment and Performance of Obligations.....................................................36
         SECTION 7.6  Compliance With Laws and Approvals.........................................................36
         SECTION 7.7  Environmental Laws.........................................................................36
         SECTION 7.8  Compliance with ERISA......................................................................37
         SECTION 7.9  Compliance With Agreements.................................................................37
         SECTION 7.10 Conduct of Business........................................................................37
         SECTION 7.11 Visits and Inspections.....................................................................37
         SECTION 7.12 Year 2000 Compatibility....................................................................37
         SECTION 7.13 Further Assurances.........................................................................38

ARTICLE VIII  FINANCIAL COVENANTS................................................................................38
         SECTION 8.1  Debt Service Coverage Ratio................................................................38
         SECTION 8.2. Tangible Net Worth.........................................................................38

ARTICLE IX  NEGATIVE COVENANTS...................................................................................38
         SECTION 9.1  Limitations on Debt........................................................................39
         SECTION 9.2  Limitations on Guaranty Obligations........................................................40
         SECTION 9.3  Limitations on Liens.......................................................................40
         SECTION 9.4  Limitations on Loans, Advances, Investments and Acquisitions...............................41
         SECTION 9.5  Limitations on Mergers and Liquidation.....................................................42
         SECTION 9.6  Limitations on Sale of Assets..............................................................42
         SECTION 9.7  Limitations on Dividends and Distributions.................................................43
         SECTION 9.8  Limitations on Exchange and Issuance of Capital Stock......................................43
         SECTION 9.9  Transactions with Affiliates...............................................................43
         SECTION 9.10 Certain Accounting Changes.................................................................44
         SECTION 9.11 Amendments; Payments and Prepayments of Subordinated Debt..................................44
         SECTION 9.12 Restrictive Agreements.....................................................................44

ARTICLE X  DEFAULT AND REMEDIES..................................................................................44
         SECTION 10.1. Events of Default.........................................................................44
         SECTION 10.2. Remedies..................................................................................47
         SECTION 10.3 Rights and Remedies Cumulative; Non-Waiver; etc............................................47

ARTICLE XI  THE ADMINISTRATIVE AGENT.............................................................................48
         SECTION 11.1 Appointment................................................................................48
         SECTION 11.2 Delegation of Duties.......................................................................48
         SECTION 11.3 Exculpatory Provisions.....................................................................48
         SECTION 11.4 Reliance by the Administrative Agent.......................................................49
</TABLE>



                                      (ii)
<PAGE>   4

<TABLE>
<S>                                                                                                             <C>
         SECTION 11.5 Notice of Default..........................................................................49
         SECTION 11.6 Non-Reliance on the Administrative Agent and Other Lenders.................................49
         SECTION 11.7 Indemnification............................................................................50
         SECTION 11.8 The Administrative Agent in Its Individual Capacity........................................50
         SECTION 11.9 Resignation of the Administrative Agent; Successor Administrative Agent....................51

ARTICLE XII  MISCELLANEOUS.......................................................................................51
         SECTION 12.1 Notices....................................................................................51
         SECTION 12.2 Expenses; Indemnity........................................................................53
         SECTION 12.3 Set-off....................................................................................53
         SECTION 12.4 Governing Law..............................................................................54
         SECTION 12.5 Consent to Jurisdiction....................................................................54
         SECTION 12.6 Binding Arbitration; Waiver of Jury Trial..................................................54
         SECTION 12.7 Reversal of Payments.......................................................................55
         SECTION 12.8 Injunctive Relief; Punitive Damages........................................................55
         SECTION 12.9 Accounting Matters.........................................................................56
         SECTION 12.10 Successors and Assigns; Participations....................................................56
         SECTION 12.11 Amendments, Waivers and Consents..........................................................59
         SECTION 12.12 Performance of Duties.....................................................................60
         SECTION 12.13 All Powers Coupled with Interest..........................................................60
         SECTION 12.14 Survival of Indemnities...................................................................60
         SECTION 12.15 Titles and Captions.......................................................................60
         SECTION 12.16 Severability of Provisions................................................................60
         SECTION 12.17 Counterparts..............................................................................60
         SECTION 12.18 Term of Agreement.........................................................................60
         SECTION 12.19 Inconsistencies with Other Documents; Independent Effect of Covenants.....................61
         SECTION 12.20 Notice of Entire Agreement................................................................61
</TABLE>


EXHIBITS

Exhibit A         -        Form of Note
Exhibit B         -        Form of Escrow Agreement
Exhibit C         -        Form of Notice of Account Designation
Exhibit D         -        Form of Notice of Prepayment
Exhibit E         -        Form of Officer's Compliance Certificate
Exhibit F         -        Form of Assignment and Acceptance
Exhibit G         -        Plans and Specifications for Arkansas Improvements
Exhibit H         -        Form of Security Agreement

SCHEDULES

Schedule 1        -        Lenders and Pro Rata Shares
Schedule 1.1      -        Real Estate not subject to Lenders' Lien
Schedule 5.1(a)   -        Jurisdictions of Organization and Qualification
Schedule 5.1(b)   -        Subsidiaries and Capitalization
Schedule 5.1(i)   -        ERISA Plans
Schedule 5.1(l)   -        Material Contracts
Schedule 5.1(m)   -        Labor and Collective Bargaining Agreements
Schedule 5.1(t)   -        Debt and Guaranty Obligations
Schedule 5.1(u)   -        Litigation
Schedule 9.3      -        Existing Liens
Schedule 9.4      -        Existing Loans, Advances and Investments



                                     (iii)


<PAGE>   5
         CREDIT AGREEMENT, dated as of the 22nd day of April, 1999, by and among
UNITED STATES LIME & MINERALS, INC., a Texas corporation ("U.S. Lime"), TEXAS
LIME COMPANY, a Texas corporation wholly owned by U.S. Lime ("TLC"), ARKANSAS
LIME COMPANY, an Arkansas corporation wholly owned by U.S. Lime ("ALC") (U.S.
Lime, TLC and ALC are collectively referred to as "Borrowers" and individually
as a "Borrower"), the Lenders who are or may become a party to this Agreement,
and FIRST UNION NATIONAL BANK, as Administrative Agent for the Lenders.

                              STATEMENT OF PURPOSE

         The Borrowers have requested, and the Lenders have agreed to extend,
certain credit facilities to the Borrowers on the terms and conditions of this
Agreement.

         NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged by the parties hereto, such
parties, intending to be legally bound hereby, agree as follows:

                                    ARTICLE I

                                   DEFINITIONS

         SECTION 1.1 Definitions.

         The following terms when used in this Agreement shall have the meanings
assigned to them below:

         "Administrative Agent" means First Union in its capacity as
Administrative Agent hereunder, and any successor thereto appointed pursuant to
Section 11.9.

         "Administrative Agent's Office" means the office of the Administrative
Agent specified in Section 12.1(c).

         "Affiliate" means, with respect to any Person, any other Person (other
than a Subsidiary) which directly or indirectly through one or more
intermediaries, controls, or is controlled by, or is under common control with,
such first Person or any of its Subsidiaries. The term "control" means the
possession, directly or indirectly, of any other power to direct or cause the
direction of the management and policies of a Person, whether through ownership
of voting securities, by contract or otherwise.

         "Aggregate Commitment" means the aggregate amount of the Lenders'
Commitments hereunder, as such amount may be reduced or modified at any time or
from time to time pursuant to the terms hereof. On the Closing Date, the
Aggregate Commitment shall be Fifty Million Dollars ($50,000,000).

         "Agreement" means this Credit Agreement, as amended, restated or
otherwise modified.

<PAGE>   6
         "Applicable Law" means all applicable provisions of constitutions,
laws, statutes, ordinances, rules, treaties, regulations, permits, licenses,
approvals, interpretations and orders of courts or Governmental Authorities and
all applicable orders and decrees of all courts and arbitrators.

         "Assignment and Acceptance" shall have the meaning assigned thereto in
Section 12.10.

         "Available Commitment" means, as to any Lender at any time, an amount
equal to (a) such Lender's Commitment less (b) such Lender's Extensions of
Credit.

         "Borrower" means each of United States Lime & Minerals, Inc., a Texas
corporation, Texas Lime Company, a Texas corporation, and Arkansas Lime Company,
an Arkansas corporation, in their joint and several capacity as borrower
hereunder, and "Borrowers" means all of them collectively in such capacity.

         "Business Day" means any day other than a Saturday, Sunday or legal
holiday on which banks in Philadelphia, Pennsylvania and New York, New York, are
open for the conduct of their commercial banking business.

         "Capital Asset" means, with respect to Borrowers and their respective
Subsidiaries, any asset that should, in accordance with GAAP, be classified and
accounted for as a capital asset on a Consolidated balance sheet of the
Borrowers and their respective Subsidiaries.

         "Capital Lease" means, with respect to the Borrowers and their
respective Subsidiaries, any lease of any property that should, in accordance
with GAAP, be classified and accounted for as a capital lease on a Consolidated
balance sheet of the Borrowers and their respective Subsidiaries.

         "Change in Control" shall have the meaning assigned thereto in Section
10.1(i).

         "Closing Date" means the date of this Agreement or such later Business
Day upon which each condition described in Section 4.1 and Section 4.2 shall be
satisfied or waived in all respects in a manner acceptable to the Administrative
Agent, in its sole discretion.

         "Code" means the Internal Revenue Code of 1986, and the rules and
regulations thereunder, each as amended, supplemented or otherwise modified.

         "Collateral" when used with respect to a Security Document shall have
the meaning assigned thereto in such Security Document.

         "Commitment" means, as to any Lender, the obligation of such Lender to
make Loans to the Borrowers hereunder in an aggregate principal amount at any
time outstanding not to exceed the amount set forth opposite such Lender's name
on Schedule 1 hereto, as the same may be reduced or modified at any time or from
time to time pursuant to the terms hereof.

         "Commitment Percentage" means, as to any Lender at any time, the ratio
of (a) the amount of the Commitment of such Lender to (b) the Aggregate
Commitment of all of the Lenders.



                                      (2)
<PAGE>   7

         "Consolidated" means, when used with reference to financial statements
or financial statement items of the Borrowers and their respective Subsidiaries,
such statements or items on a consolidated basis in accordance with applicable
principles of consolidation under GAAP.

         "Debt" means, with respect to the Borrowers and their respective
Subsidiaries at any date and without duplication, the sum of the following
calculated in accordance with GAAP: (a) all liabilities, obligations and
indebtedness for borrowed money including but not limited to obligations
evidenced by bonds (other than sales performance bonds, mining land reclamation
bonds, appeal bonds, other security bonds and letters of credit to secure
workers compensation claims which bonds and letters of credit in aggregate face
amount do not exceed $750,000), debentures, notes or other similar instruments
of any such Person; (b) all obligations to pay the deferred purchase price of
property or services of any such Person; (c) all obligations of any such Person
as lessee under Capital Leases; (d) all Debt of any other Person secured by a
Lien on any asset of any such Person (limited to the lesser of the amount
thereof and the fair market value of the Liened property); (e) all Guaranty
Obligations of any such Person; (f) all obligations, contingent or otherwise, of
any such Person relative to the face amount of letters of credit, whether or not
drawn, including without limitation any reimbursement obligation thereon, and
banker's acceptances issued for the account of any such Person; and (g) all
obligations incurred by any such Person pursuant to Hedging Agreements.

         "Debt Service" means the sum of (a) for a period of four consecutive
quarters, Interest Expense in respect of such period, plus (b) (i) for the
period commencing with the Closing Date through June 30, 2000, an amount equal
to one fifteenth (0.667) of all outstanding funded Debt (excluding any Debt
outstanding under the Working Capital Facility), and (ii) for all times after
June 30, 2000, an amount equal to the principal payments on all Debt due and
payable during the next succeeding four quarters (except for any period which
includes the Termination Date, the Obligations due on the Termination Date).

         "Debt Service Coverage Ratio" as of last day of any fiscal quarter
means the ratio of Borrowers' EBITDA to Debt Service, both calculated for the
period of four consecutive calendar quarters most recently ended as of such day.

         "Deeds of Trust" means, collectively: (i) the Deed of Trust, Assignment
of Rents, Security Agreement, Financing Statement and Fixture Filing, of even
date herewith, from TLC, as grantor, to Jeffrey O. Greenfield, as trustee
("Trustee") for the benefit of Administrative Agent for the benefit of the
Lenders to be recorded in the Office of the County Clerk of Johnson County,
Texas, and in the Office of the County Clerk of Hill County, Texas; and (ii) the
Second Deed of Trust, Assignment of Rents, Security Agreement, Financing
Statement and Fixture Filing, of even date herewith from TLC, as grantor, to
Trustee for the benefit of Administrative Agent for the benefit of Lenders to be
recorded in the Office of the County Clerk of Johnson County, Texas and in the
Office of the County Clerk of Hill County, Texas.

         "Default" means any of the events specified in Section 10.1 which with
the passage of time, the giving of notice or any other condition, would
constitute an Event of Default.



                                      (3)
<PAGE>   8

         "Dividend" shall have the meaning set forth in Section 9.7 hereof.

         "Dollars" or "$" means dollars in lawful currency of the United States.

         "EBITDA" means, for any period, the sum of Borrowers' Consolidated Net
Income, plus (i) taxes, (ii) depreciation, (iii) amortization, (iv) Interest
Expense, and (v) depletion for such period.

         "Eligible Assignee" means, with respect to any assignment of the
rights, interest and obligations of a Lender hereunder, a Person that is at the
time of such assignment (a) a commercial bank organized under the laws of the
United States or any state thereof, having combined capital and surplus in
excess of $250,000,000, (b) a domestic finance company, savings bank, insurance
company or insured thrift institution which in the ordinary course of business
extends credit of the type extended hereunder and that has total assets in
excess of $250,000,000, (c) already a Lender hereunder (whether as an original
party to this Agreement or as the assignee of another Lender), (d) the successor
(whether by transfer of assets, merger or otherwise) to all or substantially all
of the commercial lending business of the assigning Lender, or (e) any other
Person that has been approved in writing as an Eligible Assignee by the
Borrowers and the Administrative Agent.

         "Employee Benefit Plan" means any employee benefit plan within the
meaning of Section 3(3) of ERISA which (a) is maintained for employees of the
Borrowers, any Borrower, or any ERISA Affiliate or (b) has at any time within
the preceding six years been maintained for the employees of the Borrowers, any
Borrower, or any current or former ERISA Affiliate.

         "Environmental Laws" means any and all federal, state and local laws,
statutes, ordinances, rules, regulations, permits, licenses, approvals,
interpretations and orders of courts or Governmental Authorities, relating to
the protection of human health or the environment, including, but not limited
to, requirements pertaining to the manufacture, processing, distribution, use,
treatment, storage, disposal, transportation, handling, reporting, licensing,
permitting, investigation or remediation of Hazardous Materials.

         "ERISA" means the Employee Retirement Income Security Act of 1974, and
the rules and regulations thereunder, each as amended, supplemented or otherwise
modified.

         "ERISA Affiliate" means any Person who together with the Borrower is
treated as a single employer within the meaning of Section 414(b), (c), (m) or
(o) of the Code or Section 4001(b) of ERISA.

         "Escrow Agent" means First Union National Bank in its capacity as
Escrow Agent and any successor agent appointed under the terms of the Escrow
Agreement.

         "Escrow Agreement" means the Agreement by and among Borrowers, the
Administrative Agent and Escrow Agent, in the form attached hereto as Exhibit B.

         "Event of Default" means any of the events specified in Section 10.1,
provided that any requirement for passage of time, giving of notice, or any
other condition, has been satisfied.



                                      (4)
<PAGE>   9

         "Extensions of Credit" means, as to any Lender at any time, an amount
equal to such Lender's Pro Rata Share of the aggregate principal amount of the
Loans then outstanding.

         "FDIC" means the Federal Deposit Insurance Corporation, or any
successor thereto.

         "Federal Funds Rate" means, the rate per annum (rounded upwards, if
necessary, to the next higher 1/100th of 1%) representing the daily effective
federal funds rate as quoted by the Administrative Agent and confirmed in
Federal Reserve Board Statistical Release H.15 (519) or any successor or
substitute publication selected by the Administrative Agent. If, for any reason,
such rate is not available, then "Federal Funds Rate" shall mean a daily rate
which is determined, in the opinion of the Administrative Agent, to be the rate
at which federal funds are being offered for sale in the national federal funds
market at 9:00 a.m. (Charlotte time). Rates for weekends or holidays shall be
the same as the rate for the most immediate preceding Business Day.

         "First Union" means First Union National Bank, a national banking
association, and its successors.

         "Fiscal Year" means the fiscal year of the Borrowers and their
Subsidiaries ending on December 31.

         "Funding Date" means the Closing Date and each of the other dates on
which portions of the Loan Facility shall be funded hereunder (the dates on
which Tranches B through E are scheduled to be funded being set forth in Section
2.1 hereof).

         "GAAP" means generally accepted accounting principles, as recognized by
the American Institute of Certified Public Accountants and the Financial
Accounting Standards Board, consistently applied and maintained on a consistent
basis for the Borrowers and their Subsidiaries throughout the period indicated
and, except as otherwise required by GAAP, consistent with the prior financial
practice of the Borrowers and their Subsidiaries.

         "Governmental Approvals" means all authorizations, consents, approvals,
licenses and exemptions of, registrations and filings with, and reports to, all
Governmental Authorities.

         "Governmental Authority" means any nation, province, state or political
subdivision thereof, and any government or any Person exercising executive,
legislative, regulatory or administrative functions of or pertaining to
government, and any corporation or other entity owned or controlled, through
stock or capital ownership or otherwise, by any of the foregoing.

         "Guaranty Obligation" means, with respect to the Borrowers and their
Subsidiaries, without duplication, any obligation, contingent or otherwise, of
any such Person pursuant to which such Person has directly or indirectly
guaranteed any Debt or other obligation of any other Person and, without
limiting the generality of the foregoing, any obligation, direct or indirect,
contingent or otherwise, of any such Person (a) to purchase or pay (or advance
or supply funds for the purchase or payment of) such Debt or other obligation
(whether arising by virtue of partnership arrangements, by agreement to keep
well, to purchase assets, goods, securities or services, to take-



                                      (5)
<PAGE>   10

or-pay, or to maintain financial statement condition or otherwise) or (b)
entered into for the purpose of assuring in any other manner the obligee of such
Debt or other obligation of the payment thereof or to protect such obligee
against loss in respect thereof (in whole or in part); provided, that the term
Guaranty Obligation shall not include endorsements for collection or deposit or
like obligations in the ordinary course of business.

         "Hazardous Materials" means any substances or materials (a) which are
or become defined as hazardous wastes, hazardous substances, pollutants,
contaminants, chemical substances or mixtures or toxic substances under any
Applicable Law, (b) which are toxic, explosive, corrosive, flammable,
infectious, radioactive, carcinogenic, mutagenic or otherwise harmful to human
health or the environment and are or become regulated by any Governmental
Authority, (c) the presence of which require investigation or remediation under
any Applicable Law, (d) the discharge or emission or release of which requires a
permit or license under any Applicable Law or other Governmental Approval, (e)
which are deemed to constitute a nuisance, a trespass or pose a health or safety
hazard to persons or neighboring properties, (f) which consist of underground or
aboveground storage tanks, whether empty, filled or partially filled with any
substance, or which contain asbestos, polychlorinated biphenyls, urea
formaldehyde foam insulation, petroleum hydrocarbons, petroleum derived
substances (in unsafe form) or waste, crude oil, nuclear fuel, natural gas or
synthetic gas.

         "Improvements" means the modernization and expansion (i) substantially
completed by TLC of its Cleburne Texas limestone quarrying, processing, burning
and related operations, and (ii) to be undertaken with a portion of the proceeds
of the Loans by ALC of its limestone quarrying, processing, burning and related
operations in Batesville, Arkansas and the proposed Louisiana terminal in
conformity with the Plans and Specifications.

         "Interest Expense" means, for any period, total interest expense
(including, without limitation, interest expense attributable to capital leases)
determined on a consolidated basis, without duplication, for the Borrowers and
their Subsidiaries in accordance with GAAP.

         "Investment" shall have the meaning set forth in Section 9.4 hereof.

          "Lender" means each Person executing this Agreement as a Lender set
forth on the signature pages hereto and each Person that hereafter becomes a
party to this Agreement as a Lender pursuant to Section 12.10.

         "Lending Office" means, with respect to any Lender, the office of such
Lender maintaining such Lender's Pro Rata Share of the Loans.

         "Lien" means, with respect to any asset, any mortgage, lien, pledge,
charge, security interest or encumbrance of any kind in respect of such asset.
For the purposes of this Agreement, a Person shall be deemed to own subject to a
Lien any asset which it has acquired or holds subject to the interest of a
vendor or lessor under any conditional sale agreement, Capital Lease or other
title retention agreement relating to such asset.



                                      (6)
<PAGE>   11

         "Loans" means the collective reference to the Loan Facility and "Loan"
means any Tranche under the Loan Facility.

         "Loan Documents" means, collectively, this Agreement, the Notes, the
Security Agreement, the Mortgage, the Deeds of Trust, the Escrow Agreement and
each other document, instrument, certificate and agreement executed and
delivered by the Borrowers, or their Subsidiaries in connection with this
Agreement or otherwise referred to herein or contemplated hereby, all as may be
amended, restated or otherwise modified.

         "Loan Facility" means the collective reference to the credit facility
created hereby pursuant to which Lenders have agreed to make the Loans.

         "Material Adverse Effect" means, with respect to the Borrowers or any
of their Subsidiaries, a material adverse effect on the properties, business,
prospects, operations or condition (financial or otherwise) of any such Person
or the ability of any such Person to perform its obligations under the Loan
Documents, in each case to which it is a party.

         "Material Contract" means any contract or agreement, written or oral,
of the Borrowers, any Borrower, or any of their respective Subsidiaries the
failure to comply with which could reasonably be expected to have a Material
Adverse Effect.

         "Mortgage" means the Amended and Restated Mortgage, Assignment of
Leases, Rents and Profits, Security Agreement, Financing Statement and Fixture
Filing, of even date herewith between ALC, as mortgagor, and Administrative
Agent for the benefit of Lenders, as mortgagee, to be recorded in the Office of
the Clerk of Independence County, Arkansas.

         "Multiemployer Plan" means a "multiemployer plan" as defined in Section
4001(a)(3) of ERISA to which the Borrowers or any ERISA Affiliate is making, or
is accruing an obligation to make, or within the six years immediately
preceding, has made, contributions.

         "Net Cash Proceeds" means, as applicable, (a) with respect to any sale
or other disposition of assets, the gross cash proceeds received by a Borrower
or any of its Subsidiaries from such sale less the sum of (i) all income taxes
and other taxes assessed by a Governmental Authority as a result of such sale
and any other fees and expenses incurred in connection with such sale and (ii)
the principal amount of, premium, if any, and interest on any Debt secured by a
Lien on the asset (or a portion thereof) sold, which Debt is required to be
repaid in connection with such sale, (b) with respect to any offering of capital
stock or issuance of Debt, the gross cash proceeds received by such Borrower or
any of its Subsidiaries therefrom less all legal, underwriting and other fees
and expenses incurred in connection therewith and (c) with respect to any
payment under an insurance policy or in connection with a condemnation
proceeding, the amount of cash proceeds received by such Borrower or its
Subsidiaries from an insurance company or Governmental Authority, as applicable,
net of all expenses of collection.

         "Net Income" means for any period the Consolidated net income of
Borrowers and their Subsidiaries determined in accordance with GAAP consistently
applied.



                                      (7)
<PAGE>   12

         "Notes" means the collective reference to the Notes made by the
Borrowers payable to the order of each Lender, substantially in the form of
Exhibit A hereto, evidencing the Loan Facility, and any amendments and
modifications thereto, any substitutes therefor, and any replacements,
restatements, renewals or extensions thereof, in whole or in part; "Note" means
any of such Notes.

         "Notice of Account Designation" shall have the meaning assigned thereto
in Section 2.2(b).

         "Notice of Prepayment" shall have the meaning assigned thereto in
Section 2.3(b).

         "Obligations" means, in each case, whether now in existence or
hereafter arising: (a) the principal of and interest on (including interest
accruing after the filing of any bankruptcy or similar petition) the Loans and
(b) all other fees and commissions (including attorney's fees), charges,
indebtedness, loans, liabilities, financial accommodations, obligations,
covenants and duties owing by the Borrowers to the Lenders or the Administrative
Agent, of every kind, nature and description, direct or indirect, absolute or
contingent, due or to become due, contractual or tortious, liquidated or
unliquidated, and whether or not evidenced by any note, in each case under or in
respect of this Agreement, any Note, or any of the other Loan Documents.

         "Officer's Compliance Certificate" shall have the meaning assigned
thereto in Section 6.2.

         "PBGC" means the Pension Benefit Guaranty Corporation or any successor
agency.

         "Pension Plan" means any Employee Benefit Plan, other than a
Multiemployer Plan, which is subject to the provisions of Title IV of ERISA or
Section 412 of the Code and which (a) is maintained for employees of the
Borrowers or any ERISA Affiliates or (b) has at any time within the preceding
six years been maintained for the employees of the Borrowers or any of their
current or former ERISA Affiliates.

         "Permits" means all permits, licenses and approvals required by
applicable law, rule or regulation and necessary for the operation of each
Borrower's business on the Real Estate for the use and in the manner presently
used and operated by such Borrower, including without limitation the business of
quarrying, processing and burning native limestone, such Permits to include,
without limitation, mining and extraction permits, and air and water quality
permits, and any PSD Permit.

         "Permitted Liens" means the Liens in the Collateral permitted by
Section 9.3 hereof.

         "Person" means an individual, corporation, limited liability company,
partnership, association, trust, business trust, joint venture, joint stock
company, pool, syndicate, sole proprietorship, unincorporated organization,
Governmental Authority or any other form of entity or group thereof.

         "Plans and Specifications" means the plans and specifications, with
budget amounts, for the purchase of equipment and services in connection with
the Improvements to ALC's production, crushing and pyro-processing operations in
Batesville, Arkansas and the proposed Louisiana distribution terminal as
described in Exhibit G.



                                      (8)
<PAGE>   13

         "Prime Rate" means, at any time, the rate of interest per annum
publicly announced from time to time by First Union as its prime rate. Each
change in the Prime Rate shall be effective as of the opening of business on the
day such change in the Prime Rate occurs. The parties hereto acknowledge that
the rate announced publicly by First Union as its Prime Rate is an index or base
rate and shall not necessarily be its lowest or best rate charged to its
customers or other banks.

         "Pro Rata Share" means, with respect to a Lender, such Lender's
Commitment Percentage, or if the Loans are fully funded on any date of
determination, the ratio of such Lender's Loans to all outstanding Loans.

         "PSD Permit" means a Prevention of Significant Deterioration Permit
issued by the Arkansas Department of Pollution Control and Ecology relating to
airborne emissions from a kiln operating in Arkansas.

         "Real Estate" means all of the real property owned individually or
collectively by Borrowers, all easements appurtenant to or benefiting the real
property, all improvements thereto and fixtures thereon and all replacements
thereof and additions thereto, subject to the Mortgage and the Deeds of Trust.
All parcels of Real Estate not subject to any Lien in favor of Administrative
Agent for the benefit of Lenders, and the respective book values therefor, are
described in Schedule 1.1 hereto.

         "Register" shall have the meaning assigned thereto in Section 12.10(d).

         "Required Lenders" means, at any date, any combination of holders of at
least sixty-six and two-thirds percent (66-2/3%) of the aggregate unpaid
principal amount of the Notes, or if no amounts are outstanding under the Notes,
any combination of Lenders whose Pro Rata Shares aggregate at least sixty-six
and two-thirds percent (66-2/3%).

         "Responsible Officer" with respect to a Borrower means the chief
executive officer or principal financial and accounting officer of such Borrower
or any other officer of such Borrower reasonably acceptable to the
Administrative Agent.

         "Security Agreement" means the Security Agreement by and among
Borrowers and Administrative Agent for the benefit of Lenders substantially in
the form attached hereto as Exhibit H.

         "Security Documents" means the collective reference to the Security
Agreement, the Mortgage, the Deed of Trust and each other agreement or writing
pursuant to which any Borrower or any Subsidiary thereof purports to pledge or
grant a security interest in any property or assets securing the Obligations or
any such Person purports to guaranty the payment and/or performance of the
Obligations.

         "Solvent" means, as to a Borrower or Subsidiary on a particular date,
that any such Person (a) has capital sufficient to carry on its business and
transactions and all business and transactions in which it is about to engage
and is able to pay its debts as they mature, (b) owns property having a



                                      (9)
<PAGE>   14

value, at fair valuation, greater than the amount required to pay its probable
liabilities (including contingencies), and (c) does not believe that it will
incur debts or liabilities beyond its ability to pay such debts or liabilities
as they mature.

         "Subordinated Debt" means the collective reference to Debt on Schedule
5.1(t) hereof designated as Subordinated Debt and any other Debt of any of the
Borrowers or any Subsidiary subordinated in right and time of payment to the
Obligations on terms satisfactory to the Required Lenders.

         "Subsidiary" means as to any Person, any corporation, partnership,
limited liability company or other entity of which more than fifty percent (50%)
of the outstanding capital stock or other ownership interests having ordinary
voting power to elect a majority of the board of directors or other managers of
such corporation, partnership, limited liability company or other entity is at
the time, directly or indirectly, owned by such Person (irrespective of whether,
at the time, capital stock or other ownership interests of any other class or
classes of such corporation, partnership, limited liability company or other
entity shall have or might have voting power by reason of the happening of any
contingency). Unless otherwise qualified, references to "Subsidiary" or
"Subsidiaries" herein shall refer to those of the Borrowers.

         "Tangible Net Worth" means the sum of each Borrower's (i) capital
stock, (ii) cumulative retained earnings, (iii) additions to capital, (iv)
capital in excess of par or stated value, and (v) any other account which, in
accordance with GAAP constitutes shareholders equity, less the sum of each
Borrower's (a) treasury stock, and (b) intangible assets carried on the books of
Borrowers.

         "Termination Date" means March 30, 2007, the date of scheduled maturity
of the Loan Facility.

         "Termination Event" means: (a) a "Reportable Event" described in
Section 4043 of ERISA, or (b) the withdrawal of any Borrower or any ERISA
Affiliate from a Pension Plan during a plan year in which it was a "substantial
employer" as defined in Section 4001(a)(2) of ERISA, or (c) the termination of a
Pension Plan, the filing of a notice of intent to terminate a Pension Plan or
the treatment of a Pension Plan amendment as a termination under Section 4041 of
ERISA, or (d) the institution of proceedings to terminate, or the appointment of
a trustee with respect to, any Pension Plan by the PBGC, or (e) any other event
or condition which would constitute grounds under Section 4042(a) of ERISA for
the termination of, or the appointment of a trustee to administer, any Pension
Plan, or (f) the partial or complete withdrawal of the Borrower or any ERISA
Affiliate from a Multiemployer Plan, or (g) the imposition of a Lien pursuant to
Section 412 of the Code or Section 302 of ERISA, or (h) any event or condition
which results in the reorganization or insolvency of a Multiemployer Plan under
Sections 4241 or 4245 of ERISA, or (i) any event or condition which results in
the termination of a Multiemployer Plan under Section 4041A of ERISA or the
institution by PBGC of proceedings to terminate a Multiemployer Plan under
Section 4042 of ERISA. U.S. Lime's proposed merger of its Employee Stock
Ownership Plan with and into its 401-K pension plan (expected to occur in late
1999 or 2000) shall not be deemed to constitute a Termination Event for purposes
hereof, provided that the 401-K pension



                                      (10)
<PAGE>   15

plan remains a qualified Pension Plan and U.S. Lime obtains a determination
letter to that effect from the Internal Revenue Service within 365 days after
the effective date of such merger.

         "Tranche A" means the portion of the Loan Facility to be funded on the
Closing Date.

         "Tranche B" means the portion of the Loan Facility scheduled to be
funded on June 30, 1999.

         "Tranche C" means the portion of the Loan Facility scheduled to be
funded on September 30, 1999.

         "Tranche D" means the portion of the Loan Facility scheduled to be
funded on December 30, 1999.

         "Tranche E" means the portion of the Loan Facility scheduled to be
funded on March 30, 2000.

         "UCC" means the Uniform Commercial Code as in effect in the
Commonwealth of Pennsylvania, as amended, restated or otherwise modified.

         "United States" means the United States of America.

         "Wholly-Owned" means, with respect to a Subsidiary, that all of the
shares of capital stock or other ownership interests of such Subsidiary are,
directly or indirectly, owned or controlled by a Borrower and/or one or more of
its Wholly-Owned Subsidiaries.

         "Working Capital Facility" means the indebtedness of Borrowers on a
revolving credit basis made available by First Union in its individual capacity
and not as Administrative Agent or a Lender hereunder, or another commercial
lender, and any refinancing thereof for substantially the same purpose with
First Union or another commercial lender.

         SECTION 1.2 General.

         Unless otherwise specified, a reference in this Agreement to a
particular section, subsection, Schedule or Exhibit is a reference to that
section, subsection, Schedule or Exhibit of this Agreement. Wherever from the
context it appears appropriate, each term stated in either the singular or
plural shall include the singular and plural, and pronouns stated in the
masculine, feminine or neuter gender shall include the masculine, the feminine
and the neuter. Any reference herein to "Philadelphia time" shall refer to the
applicable time of day in Philadelphia, Pennsylvania.

         SECTION 1.3 Other Definitions and Provisions.

         (a) Use of Capitalized Terms. Unless otherwise defined therein, all
capitalized terms defined in this Agreement shall have the defined meanings when
used in this Agreement, the Notes and the other Loan Documents or any
certificate, report or other document made or delivered pursuant to this
Agreement.



                                      (11)
<PAGE>   16

         (b) Miscellaneous. The words "hereof", "herein" and "hereunder" and
words of similar import when used in this Agreement shall refer to this
Agreement as a whole and not to any particular provision of this Agreement.

                                   ARTICLE II

                                  LOAN FACILITY

         SECTION 2.1 Loans.

         Subject to the terms and conditions of this Agreement and in reliance
upon the representations and warranties herein set forth, each Lender hereby
severally agrees to lend to Borrowers on each Funding Date an amount equal to
such Lender's Commitment Percentage of the Tranche to be advanced on such
Funding Date.

         SECTION 2.2 Procedure for Loan Fundings.

         (a) Funding Dates. Subject to the terms and conditions of this
Agreement, the Loan Facility shall be funded in five installments. Tranche A, in
the amount of $30,000,000, shall be funded on the Closing Date. The remaining
unfunded balance of the Loan Facility shall be advanced after the Closing Date
in the amounts and, except as provided herein, on the dates set forth below:

<TABLE>
<CAPTION>

       Installment                 Date                              Amount
       -----------                 ----                              ------
<S>                                <C>                               <C>
       Tranche B                   June 30, 1999                   $5,000,000
       Tranche C                   September 30, 1999              $5,000,000
       Tranche D                   December 30, 1999               $5,000,000
       Tranche E                   March 30, 2000                  $5,000,000
</TABLE>

All advances under the Loan Facility after the Closing Date shall be made to
Escrow Agent under and subject to the terms of the Escrow Agreement.

         (b) Disbursement of Loans. Not later than 11:00 a.m. (Philadelphia
time) on each Funding Date, each Lender will make available to the
Administrative Agent, for the account of the Borrowers, at the office of the
Administrative Agent in funds immediately available to the Administrative Agent,
such Lender's Commitment Percentage of the Tranche to be advanced on such
Funding Date. The Borrowers hereby irrevocably authorize the Administrative
Agent to disburse the proceeds of the Tranche A on the Closing Date in
immediately available funds by crediting or wiring such proceeds to the deposit
account of a Borrower identified in the most recent notice substantially in the
form of Exhibit C hereto (a "Notice of Account Designation") delivered by the
Borrowers to the Administrative Agent or may be otherwise agreed upon by the
Borrowers and the Administrative Agent from time to time. Borrowers hereby
authorize Administrative Agent to disburse the proceeds of Tranche B, Tranche C,
Tranche D and Tranche E to the deposit account



                                      (12)
<PAGE>   17

designated by Borrowers in the most recent Notice of Account Designation
delivered to Administrative Agent and Escrow Agent from time to time. All loans
funded into the escrow created by the Escrow Agreement shall be retained by
Escrow Agent and invested as provided in the Escrow Agreement. The
Administrative Agent shall not be obligated to disburse the portion of the
proceeds of any Loan due to be funded pursuant to this Section 2.2 to the extent
that any Lender has not made available to the Administrative Agent its
Commitment Percentage of such Loan.

         (c) Delayed Funding Date(s); Termination of Commitment. Borrowers
intend that the Arkansas Improvements will be constructed in two phases. The
first phase ("Phase I") includes the addition of a new 600 ton per day rotary
kiln, new stone crushing and handling equipment, the rebuilding of the internal
railroad, the construction of an out of state terminal, and new ground calcium
carbonate storage and loadout facilities. Operation of the Phase I kiln is
contingent upon ALC's receipt of a PSD Permit. Notwithstanding the scheduled
Funding Dates set forth in Section 2.2(a) hereof, if the PSD Permit for the
Phase I Kiln has not been issued on or before the scheduled Tranche B Funding
Date, Borrowers may, by providing written notice to Administrative Agent, elect
to postpone the Tranche B Funding Date, and any other Funding Date which was
scheduled during such deferment. If the Tranche B Funding Date is deferred by
any delay in the issuance of a PSD Permit for Phase I, the Funding Date for
Tranche B shall be five Business Days after Administrative Agent's receipt of
written notice from ALC regarding its receipt of the PSD Permit; and the Funding
Date for each successive Tranche shall be the earlier of (x) five Business Days
after Administrative Agent's receipt of written notice from ALC regarding its
receipt of the PSD Permit or (y) the scheduled Funding Date for such Tranche set
forth in Section 2.2.(a) hereof; provided however, that if any of Tranche B
through Tranche D shall not have been funded on or before December 31, 1999, any
unfunded amounts of the portion of the Aggregate Commitments attributable to
Tranches B, C, and D shall be terminated without notice to Borrowers or other
action by Administrative Agent as of December 31, 1999. In such event,
Administrative Agent shall promptly notify Borrowers and Borrowers shall pay
immediately to Administrative Agent, for the accounts of the Lenders pro rata, a
breakup fee equal to the product of (i) 1/4 percent (.25%) multiplied by (ii)
the sum of the unfunded portion of the Aggregate Commitment attributable to
Tranches B, C and D. Phase II of the Arkansas Improvements ("Phase II") includes
a second lime kiln, and additional lime storage facilities. Prior to advancing
Tranche E, ALC shall either: (i) have received a PSD Permit for the Phase II
kiln, or (ii) achieved at least $10,000,000 in EBITDA for the period of four
consecutive fiscal quarters ending immediately prior to the Tranche E Funding
Date. If ALC has not satisfied either clause (i) or (ii) of the preceding
sentence on or before May 31, 2000, then the unfunded portion of the Aggregate
Commitment shall be terminated as of such date without notice to Borrowers or
other action by Administrative Agent. In such event, Borrowers shall pay
immediately to Administrative Agent, for the accounts of the Lenders pro rata, a
breakup fee calculated in the same manner as for Tranches B through D above.

         (d) Fundings out of Escrow. Provided that applicable portions of the
Loan have been funded to Escrow Agent, Borrowers may request progress payments
from time to time from Administrative Agent whenever the aggregate amount of
expenditures on the Arkansas Improvements for which Borrowers seek reimbursement
exceeds $1,000,000 (the "Minimum Advance Amount"). When Borrowers desire
reimbursement from the Loans in escrow, Borrowers shall deliver to
Administrative Agent copies of construction invoices for direct construction
costs,



                                      (13)
<PAGE>   18

and with respect to indirect construction costs, such supporting information as
Administrative Agent shall reasonably require, for budgeted materials and
services in connection with the Arkansas Improvements. Within five Business Days
following submission to Administrative Agent of invoices or other supporting
documentation reasonably satisfactory to Administrative Agent in an aggregate
amount no less than the Minimum Advance Amount, Administrative Agent will
instruct Escrow Agent in writing to disburse to the account designated by
Borrowers on the most recent Notice of Account Designation the amount requested
or such lesser amount as sufficient documentation therefor has been provided to
Administrative Agent. Borrowers may request advances from the Loans in escrow
not more than five times per fiscal quarter.

         SECTION 2.3 Repayment of Loans.

         (a) Scheduled Repayments. Unless the Loan is sooner paid in full,
Borrowers shall make 83 payments of principal in the amount of $277,777.78, an
amount based on a 15-year amortization of the Aggregate Commitment, commencing
on April 30, 2000, and continuing thereafter on the last day of each month, plus
a final payment of the entire remaining outstanding principal balance of the
Loan Facility on the Termination Date.

         (b) Optional Prepayments. The Borrowers may at any time from and after
March 30, 2000 prepay the Loans, in whole or in part, upon at least one (1)
Business Day's irrevocable notice in the form attached hereto as Exhibit D (a
"Notice of Prepayment") provided that each such prepayment shall be multiplied
by the applicable percentage set forth below for prepayments made during such
period, and the product thereof shall be the amount due:

<TABLE>
<CAPTION>
                  On or after March 30:                  Multiplier:
                  --------------------                   ----------

<S>                                                     <C>
                  2000                                   1.04
                  2001                                   1.04
                  2002                                   1.03
                  2003                                   1.02
                  2004                                   1.01
                  2005                                   1.00
</TABLE>

         Upon receipt of a Notice of Prepayment, the Administrative Agent shall
promptly notify each Lender. If any Notice of Prepayment is given, the product
of the amount specified in such notice and the applicable multiplier shall be
due and payable on the date set forth in such Notice of Prepayment.

         SECTION 2.4 Notes.

         Each Lender's Loans and the obligation of the Borrowers to repay such
Loans shall be evidenced by separate Notes executed by the Borrowers payable to
the order of such Lender representing the Borrowers' joint and several
obligation to pay such Lender's Loans made and to be made by such Lender to the
Borrowers hereunder, plus interest and all other fees, charges and other



                                      (14)
<PAGE>   19

amounts due thereon. Borrowers shall make two Notes for each Lender, one in the
amount of such Lender's Pro Rata Share of $10,000,000 (being the amount of the
first priority Deed of Trust) and the other in the amount of such Lender's Pro
Rata Share of $40,000,000 (being the amount of the second priority Deed of
Trust). Each Note shall be dated the date hereof and shall bear interest on the
unpaid principal amount thereof at the applicable interest rate per annum
specified in Section 3.1.

         SECTION 2.5 Termination of Loan Facility.

         The Loan Facility shall terminate on the earlier of (a) the Termination
Date, or (b) the date of termination by the Administrative Agent on behalf of
the Lenders pursuant to Section 10.2(a).

         SECTION 2.6 Use of Proceeds.

         Borrowers shall use the proceeds of Tranche A to refinance amounts
previously expended by TLC in connection with the Improvements to the Cleburne,
Texas quarrying, burning, processing and related operations, shall reserve
$5,000,000 for the Arkansas Improvements, and may use the balance thereof for
any lawful corporate purpose of one or more of the Borrowers. Borrowers shall
use the proceeds of Tranches B through E to finance the costs of the
Improvements to the Batesville, Arkansas quarrying, burning, processing and
related operations in accordance with the Plans and Specifications.

         SECTION 2.7 Charging Deposit Accounts.

         Whenever Borrowers are obligated to make payments of any nature to
Lenders, Administrative Agent shall be entitled, and each Borrower hereby
authorizes Administrative Agent, to draw against any deposit account owned by a
Borrower at Administrative Agent on account of such payments, fees or expenses
due. Promptly after such drawing, Administrative Agent shall deliver to
Borrowers a notice setting forth, in reasonable detail, the amount of the
payments, fees or expenses satisfied by such draw and the name or number of the
account or accounts from which the draw was made.

                                   ARTICLE III

                             GENERAL LOAN PROVISIONS

         SECTION 3.1 Interest.

         (a) Tranche A. The outstanding principal balance of Tranche A shall
bear interest at the fixed rate of eight and seventy five hundredths percent
(8.75%) per annum.

         (b) Tranches B-E. The outstanding principal balance of each of Tranche
B, Tranche C, Tranche D and Tranche E shall bear interest at a rate, determined
with respect to such Tranche three Business Days prior to the Funding Date
therefor, equal to the sum of (i) three and fifty-two one hundredths percent
(3.52%) per annum, plus (ii) the secondary market yield (as published in The
Wall Street Journal on the most recent date of publication before the Funding
Date or, if no longer



                                      (15)
<PAGE>   20

published, the equivalent secondary market yield as determined by the
Administrative Agent by any reasonable method) for the United States Treasury
obligation maturing May 15, 2005 (CUSIP #91287T85).

         (c) Default Rate. Subject to Section 10.3, at the discretion of the
Administrative Agent and Required Lenders, upon the occurrence and during the
continuance of an Event of Default, all outstanding Loans shall bear interest at
a rate per annum equal to two percent (2%) in excess of the rate then applicable
to such Loans. Interest shall continue to accrue on the Notes after the filing
by or against the Borrowers of any petition seeking any relief in bankruptcy or
under any act or law pertaining to insolvency or debtor relief, whether state,
federal or foreign.

         (d) Interest Payment and Computation. Interest on each Loan shall be
payable in arrears on the last Business Day of each month commencing May 31,
1999. All interest rates, fees and commissions provided hereunder shall be
computed on the basis of a 30 day-month, 360-day year.

         (e) Maximum Rate. In no contingency or event whatsoever shall the
aggregate of all amounts deemed interest hereunder or under any of the Notes
charged or collected pursuant to the terms of this Agreement or pursuant to any
of the Notes exceed the highest rate permissible under any Applicable Law which
a court of competent jurisdiction shall, in a final determination, deem
applicable hereto. In the event that such a court determines that the Lenders
have charged or received interest hereunder in excess of the highest applicable
rate, the rate in effect hereunder shall automatically be reduced to the maximum
rate permitted by Applicable Law and the Lenders shall at the Administrative
Agent's option (i) promptly refund to the Borrowers any interest received by
Lenders in excess of the maximum lawful rate or (ii) shall apply such excess to
the principal balance of the Obligations. It is the intent hereof that the
Borrowers not pay or contract to pay, and that neither the Administrative Agent
nor any Lender receive or contract to receive, directly or indirectly in any
manner whatsoever, interest in excess of that which may be paid by the Borrowers
under Applicable Law.

         SECTION 3.2 Agent's Fee.

         In order to compensate Administrative Agent for its services in such
capacity, Borrowers agree to pay Administrative Agent, for its account, a fee
equal to twelve and one-half basis points (0.125%) per annum of the outstanding
principal balance of the Loans, which fee shall be payable on last day of each
three-month period with the first payment due on July 31, 1999 and thereafter on
each October 31, January 31, April 30, and July 31 of each year through the
final payment on March 31, 2007.

         SECTION 3.3 Manner of Payment.

         Each payment by the Borrowers on account of the principal of or
interest on the Loans or of any fee, commission or other amounts payable to the
Lenders under this Agreement or any Note shall be made not later than 1:00 p.m.
(Philadelphia time) on the date specified for payment under this Agreement to
the Administrative Agent at the Administrative Agent's Office for the account of




                                      (16)
<PAGE>   21

the Lenders (other than as set forth below) pro rata in accordance with their
respective Pro Rata Share (except as specified below), in Dollars, in
immediately available funds and shall be made without any set-off, counterclaim
or deduction whatsoever. Any payment received after such time but before 2:00
p.m. (Philadelphia time) on such day shall be deemed a payment on such date for
the purposes of Section 10.1, but for all other purposes shall be deemed to have
been made on the next succeeding Business Day. Any payment received after 2:00
p.m. (Philadelphia time) shall be deemed to have been made on the next
succeeding Business Day for all purposes. Upon receipt by the Administrative
Agent of each such payment, the Administrative Agent shall distribute to each
Lender at its address for notices set forth herein its pro rata share of such
payment in accordance with such Lender's Pro Rata Shares and shall wire advice
of the amount of such credit to each Lender. Each payment to the Administrative
Agent of Administrative Agent's fees or expenses shall be made for the account
of the Administrative Agent and any amount payable to any Lender under Sections
3.7, 3.8, 3.9, or 12.2 or shall be paid to the Administrative Agent for the
account of the applicable Lender. Whenever any payment under this Agreement or
any Note shall be specified to be made upon a day which is not a Business Day,
it shall be made on the next succeeding day which is a Business Day and such
extension of time shall in such case be included in computing any interest if
payable along with such payment.

         SECTION 3.4 Crediting of Payments and Proceeds.

         In the event that the Borrowers shall fail to pay any of the
Obligations when due and the Obligations have been accelerated pursuant to
Section 10.2, all payments received by the Lenders upon the Notes and the other
Obligations and all net proceeds from the enforcement of the Obligations shall
be applied first to all expenses then due and payable by the Borrowers
hereunder, then to all indemnity obligations then due and payable by the
Borrowers hereunder, then to all Administrative Agent's fees then due and
payable, then to all commitment and other fees and commissions then due and
payable, then to accrued and unpaid interest on the Notes, then to the principal
amount of the Notes (pro rata in accordance with all such amounts due), in that
order.

         SECTION 3.5 Adjustments.

         If any Lender (a "Benefitted Lender") shall at any time receive any
payment of all or part of the Obligations owing to it, or interest thereon, or
if any Lender shall at any time receive any collateral in respect to the
Obligations owing to it (whether voluntarily or involuntarily, by set-off or
otherwise) in a greater proportion than any such payment to and collateral
received by any other Lender, if any, in respect of the Obligations owing to
such other Lender, or interest thereon, such Benefitted Lender shall purchase
for cash from the other Lenders such portion of each such other Lender's
Extensions of Credit, or shall provide such other Lenders with the benefits of
any such collateral, or the proceeds thereof, as shall be necessary to cause
such Benefitted Lender to share the excess payment or benefits of such
collateral or proceeds ratably with each of the Lenders; provided, that if all
or any portion of such excess payment or benefits is thereafter recovered from
such Benefitted Lender, such purchase shall be rescinded, and the purchase price
and benefits returned to the extent of such recovery, but without interest. The
Borrower agrees that each Lender so purchasing a portion of another Lender's
Extensions of Credit may exercise all rights of payment



                                      (17)
<PAGE>   22

(including, without limitation, rights of set-off) with respect to such portion
as fully as if such Lender were the direct holder of such portion.

         SECTION 3.6 Nature of Obligations of Lenders Regarding Extensions of
Credit; Assumption by the Administrative Agent.

         The obligations of the Lenders under this Agreement to make the Loans
are several and are not joint or joint and several. Unless the Administrative
Agent shall have received notice from a Lender prior to a proposed borrowing
date that such Lender will not make available to the Administrative Agent such
Lender's ratable portion of the amount to be borrowed on such date (which notice
shall not release such Lender of its obligations hereunder), the Administrative
Agent may assume that such Lender has made such portion available to the
Administrative Agent on the proposed Funding Date in accordance with Section
2.2(b) and the Administrative Agent may, in reliance upon such assumption, make
available to the Borrowers on such date a corresponding amount. If such amount
is made available to the Administrative Agent on a date after such Funding Date,
such Lender shall pay to the Administrative Agent on demand an amount, until
paid, equal to the product of (a) the amount not made available by such Lender
in accordance with the terms hereof, times (b) the daily average Federal Funds
Rate during such period as determined by the Administrative Agent, times (c) a
fraction the numerator of which is the number of days that elapse from and
including such Funding Date to the date on which such amount not made available
by such Lender in accordance with the terms hereof shall have become immediately
available to the Administrative Agent and the denominator of which is 360. A
certificate of the Administrative Agent with respect to any amounts owing under
this Section shall be conclusive, absent manifest error. If such Lender's
Commitment Percentage of such Loan is not made available to the Administrative
Agent by such Lender within three (3) Business Days of such Funding Date, the
Administrative Agent shall be entitled to recover such amount made available by
the Administrative Agent with interest thereon at the rate per annum applicable
to Tranche A hereunder, on demand, from the Borrowers. The failure of any Lender
to make available its Commitment Percentage of any Loan requested by the
Borrowers shall not relieve it or any other Lender of its obligation, if any,
hereunder to make its Commitment Percentage of such Loan available on the
Funding Date, but no Lender shall be responsible for the failure of any other
Lender to make its Commitment Percentage of such Loan available on the Funding
Date.

         SECTION 3.7 Changed Circumstances.

         If, after the date hereof, the introduction of, or any change in, any
Applicable Law, or in the interpretation or administration thereof by any
Governmental Authority, central bank or comparable agency charged with the
interpretation or administration thereof, or compliance by any of the Lenders
(or any of their respective Lending Offices) with any request or directive
(whether or not having the force of law) of such Authority, central bank or
comparable agency:

                  (i) shall subject any of the Lenders (or any of their
respective Lending Offices) to any tax, duty or other charge with respect to any
Note or shall change the basis of taxation of payments to any of the Lenders (or
any of their respective Lending Offices) of the principal of or interest on any
Note or any other amounts due under this Agreement in respect thereof (except
for



                                      (18)
<PAGE>   23

changes in the rate of tax on the overall net income of any of the Lenders or
any of their respective Lending Offices imposed by the jurisdiction in which
such Lender is organized or is or should be qualified to do business or such
Lending Office is located); or

                  (ii) shall impose, modify or deem applicable any reserve
(including, without limitation, any imposed by the Board of Governors of the
Federal Reserve System), special deposit, insurance or capital or similar
requirement against assets of, deposits with or for the account of, or credit
extended by any of the Lenders (or any of their respective Lending Offices) or
shall impose on any of the Lenders (or any of their respective Lending Offices)
or the foreign exchange and interbank markets any other condition affecting any
Note;

and the result of any of the foregoing is to increase the costs to any of the
Lenders of maintaining any Loan or to reduce the yield or amount of any sum
received or receivable by any of the Lenders under this Agreement or under the
Notes, then such Lender shall promptly notify the Administrative Agent, and the
Administrative Agent shall promptly notify the Borrowers of such fact and demand
compensation therefor and, within fifteen (15) days after such notice by the
Administrative Agent, the Borrowers shall pay to such Lender such additional
amount or amounts as will compensate such Lender or Lenders for such increased
cost or reduction. The Administrative Agent will promptly notify the Borrowers
of any event of which it has knowledge which will entitle such Lender to
compensation pursuant to this Section; provided, that the Administrative Agent
shall incur no liability whatsoever to the Lenders or the Borrowers in the event
it fails to do so. A certificate of such Lender setting forth the basis for
determining such amount or amounts necessary to compensate such Lender shall be
forwarded to the Borrowers through the Administrative Agent and shall be
conclusively presumed to be correct save for manifest error.

         SECTION 3.8 Capital Requirements.

         If either (a) the introduction of, or any change in, or in the
interpretation of, any Applicable Law or (b) compliance with any guideline or
request from any central bank or comparable agency or other Governmental
Authority (whether or not having the force of law), has or would have the effect
of reducing the rate of return on the capital of, or has affected or would
affect the amount of capital required to be maintained by, any Lender or any
corporation controlling such Lender as a consequence of, or with reference to
the Commitments and other similar commitments, below the rate which the Lender
or such other corporation could have achieved but for such introduction, change
or compliance, then within five (5) Business Days after written demand by any
such Lender, the Borrowers shall pay to such Lender from time to time as
specified by such Lender additional amounts sufficient to compensate such Lender
or other corporation for such reduction. A certificate as to such amounts
submitted to the Borrowers and the Administrative Agent by such Lender, shall,
in the absence of manifest error, be presumed to be correct and binding for all
purposes.

         SECTION 3.9       Duty to Mitigate; Assignment of Pro Rata Shares.



                                      (19)
<PAGE>   24

         (a) Duty to Mitigate. If (i) any Lender shall request compensation
under Section 3.7 or 3.8 hereof, (ii) any Lender delivers a notice described in
Sections 3.7 or 3.8, or (iii) Borrowers are required to pay any additional
amount to any Lender or Governmental Authority on account of a Lender pursuant
to Sections 3.7 or 3.8, then such Lender shall use reasonable efforts (which
shall not require such Lender to incur an unreimbursed loss or unreimbursed cost
or expense or otherwise take any action inconsistent with its internal policies
or legal or regulatory restrictions or suffer any disadvantage or burden deemed
by it to be significant) (x) to file any certificate or document reasonably
requested by Borrowers, or (y) to assign its rights and delegate and transfer
its obligations hereunder to another of its offices, branches or affiliates, if
such filing or assignment would reduce its claims for compensation under
Sections 3.7 or 3.8 or enable it to withdraw a notice pursuant to either of such
Sections.

         (b) Assignment of Pro Rata Shares Under Certain Circumstances. In the
event (i) any Lender shall request compensation under Section 3.7 or 3.8 hereof,
(ii) any Lender delivers a notice described in Sections 3.7 or 3.8, or (iii)
Borrowers are required to pay any additional amount to any Lender or
Governmental Authority on account of a Lender pursuant to Section 3.7 or 3.8,
the Borrowers may, at their sole expense and effort (including with respect to
any fees for recording or filing instruments occasioned thereby), require such
Lender to transfer and assign, without recourse, all of its interests, rights
and obligations under this Agreement to an Eligible Assignee that shall assume
such assigned obligations (which Eligible Assignee may be another Lender, if a
Lender accepts such assignment); provided that (x) such assignment shall not
conflict with any law, rule or regulation or order of any court or other
Governmental Authority having jurisdiction, (y) Borrowers shall have received
the prior written consent of the Administrative Agent, which consent shall not
be unreasonably withheld, and (z) Borrowers or such Eligible Assignee shall have
paid to the affected Lender in immediately available funds an amount equal to
the sum of the principal of and interest accrued to the date of such payment on
the outstanding Loans of such Lender, plus all fees and other amounts accrued
for the account of the affected Lender (including amounts claimed under Section
3.7 or 3.8); provided further that, if prior to any such transfer and
assignment, the circumstances or event that resulted in such Lender's claim for
or notice of compensation under Section 3.7 or 3.8 cease to cause such Lender to
suffer the consequences for which compensation is claimed, or if such Lender
shall waive its right to claim further compensation under Section 3.7 or 3.8 in
respect of such circumstances or event or shall withdraw its notice under such
Sections, then such Lender shall not be required to make any such transfer and
assignment hereunder.

         SECTION 3.10 Security.

         The Obligations of the Borrowers shall be secured as provided in the
Security Documents. If any of the proceeds of the Loans are used to acquire
personal property or for Improvements not located on or at Real Estate subject
to the Mortgage or Deeds of Trust, Borrowers shall execute and deliver such
additional financing statements, mortgages, deeds of trust, leasehold mortgages,
landlords waivers and other security documents reasonably requested by
Administrative Agent as additional collateral security for the Obligations.



                                      (20)
<PAGE>   25

                                   ARTICLE IV

                  CLOSING; CONDITIONS OF CLOSING AND BORROWING

         SECTION 4.1 Closing.

         The closing shall take place at the offices of Mesirov Gelman Jaffe
Cramer & Jamieson, L.L.P. at 10:00 a.m. on April 22, 1999, or on such other date
as the parties hereto shall mutually agree.

         SECTION 4.2 Conditions to Closing and Initial Extensions of Credit.

         The obligation of the Lenders to close this Agreement and to fund
Tranche A is subject to the satisfaction of each of the following conditions:

         (a) Executed Loan Documents. This Agreement, the Notes, the Security
Agreement, the Mortgage, the Deeds of Trust, and the Escrow Agreement shall have
been duly authorized, executed and delivered to the Administrative Agent by the
parties thereto, and shall be in full force and effect and no default shall
exist thereunder, and the Borrowers shall have delivered original counterparts
thereof to the Administrative Agent.

         (b) Closing Certificates; etc.

                  (i) Officers' Certificate of the Borrowers. The Administrative
Agent shall have received a certificate from a Responsible Officer, in form and
substance satisfactory to the Administrative Agent, to the effect that all
representations and warranties of the Borrowers contained in this Agreement and
the other Loan Documents are true, correct and complete; that none of the
Borrowers is in violation of any of the covenants contained in this Agreement
and the other Loan Documents; that, after giving effect to the transactions
contemplated by this Agreement, no Default or Event of Default has occurred and
is continuing; and that the Borrowers have satisfied each of the closing
conditions which have not been waived.

                  (ii) Certificate of Secretary of each Borrower. The
Administrative Agent shall have received a certificate of the secretary or
assistant secretary of each Borrower certifying as to the incumbency and
genuineness of the signature of each officer of such Borrower executing Loan
Documents to which it is a party and certifying that attached thereto is a true,
correct and complete copy of (A) the articles of incorporation of such Borrower
and all amendments thereto, certified as of a recent date by the Secretary of
State of its jurisdiction of incorporation, (B) the bylaws of such Borrower as
in effect on the date of such certifications, (C) resolutions duly adopted by
the Board of Directors of such Borrower authorizing the borrowings contemplated
hereunder and the execution, delivery and performance of this Agreement and the
other Loan Documents to which it is a party, and (D) each certificate required
to be delivered pursuant to Section 4.2(b)(iii).

                  (iii) Certificates of Good Standing. To the extent requested
by the Administrative Agent, the Administrative Agent shall have received
long-form certificates as of a



                                      (21)
<PAGE>   26

recent date of the good standing of each Borrower under the laws of its
jurisdiction of organization and each other jurisdiction where such Borrower is
qualified to do business and a certificate of the relevant taxing authorities of
such jurisdictions certifying that such Person has filed required tax returns
and owes no delinquent taxes.

                  (iv) Opinions of Counsel. The Administrative Agent shall have
received favorable opinions of counsel to the Borrowers addressed to the
Administrative Agent and the Lenders with respect to the Borrowers, the Loan
Documents and such other matters as the Lenders shall reasonably request.

         (c) Collateral.

                  (i) Filings and Recordings. All filings and recordations that
are necessary to perfect the security interests of the Administrative Agent and
the Lenders in the collateral described in the Security Documents shall have
been forwarded for filing in all appropriate locations and the Administrative
Agent shall have received evidence reasonably satisfactory to the Administrative
Agent that upon such filings and recordations such security interests constitute
valid and perfected first priority Liens therein (except for Permitted Liens).

                  (ii) Lien Search. The Administrative Agent shall have received
the results of a Lien search (including a search as to judgments, pending
litigation and tax matters) made against the Borrowers under the Uniform
Commercial Code (or applicable judicial docket) as in effect in any state in
which any of its assets are located, indicating among other things that its
assets are free and clear of any Lien except for Liens permitted hereunder.

                  (iii) Hazard and Liability Insurance. The Administrative Agent
shall have received certificates of insurance, evidence of payment of all
insurance premiums for the current policy year of each, and, if requested by the
Administrative Agent, copies (certified by a Responsible Officer) of insurance
policies in the form required under the Security Documents and otherwise in form
and substance reasonably satisfactory to the Administrative Agent.

                  (iv) Title Insurance. The Administrative Agent shall have
received a marked-up commitment for a policy of title insurance, insuring
Lenders' first priority Liens, and showing no Liens prior to Lenders' Liens,
other than for ad valorem taxes not yet due and payable and except for other
Permitted Liens, with title insurance companies acceptable to the Administrative
Agent on the property subject to the Mortgage and the Deeds of Trust. Further,
the Borrowers agree to provide or obtain any customary affidavits and
indemnities as may be required or necessary to obtain title insurance reasonably
satisfactory to the Administrative Agent.

                  (v) Title Exceptions. The Administrative Agent shall have
received copies of all recorded documents creating exceptions to the title
policy referred to in Section 4.2(c)(iv).

                  (vi) Matters Relating to Flood Hazard Properties. The
Administrative Agent shall have received a certification from the National
Research Center, or any successor agency thereto, regarding each parcel of real
property securing any portion of the Obligations.



                                      (22)
<PAGE>   27

                  (vii) Surveys. The Administrative Agent shall have received
copies of such surveys of any of the parcels of real property subject to the
Mortgages and Deeds of Trust as Borrowers possess or the existence of which
Borrowers are aware.

                  (viii) Environmental Assessments. The Administrative Agent
shall have received a reliance letter satisfactory to Administration Agent from
International Technology Corporation stating that Lenders may rely on the Phase
I Environmental Site Assessments for ALC and TLC dated December 1998 previously
delivered to Administrative Agent.

                  (ix) Other Real Property Information. The Administrative Agent
shall have received such other certificates, documents and information as are
reasonably requested by the Lenders, including, without limitation, mineral
reserve studies, engineering and structural reports, permanent certificates of
occupancy and evidence of zoning compliance, each in form and substance
satisfactory to the Administrative Agent.

         (d) Consents; Defaults.

                  (i) Governmental and Third Party Approvals. The Borrowers
shall have obtained all necessary approvals, authorizations and consents of any
Person and of all Governmental Authorities and courts having jurisdiction with
respect to the transactions contemplated by this Agreement and the other Loan
Documents.

                  (ii) No Injunction, Etc. No action, proceeding, investigation,
regulation or legislation shall have been instituted, threatened or proposed
before any Governmental Authority to enjoin, restrain, or prohibit, or to obtain
substantial damages in respect of, or which is related to or arises out of this
Agreement or the other Loan Documents or the consummation of the transactions
contemplated hereby or thereby, or which, in the Administrative Agent's sole
discretion, would make it inadvisable to consummate the transactions
contemplated by this Agreement and such other Loan Documents.

                  (iii) No Event of Default. No Default or Event of Default
shall have occurred and be continuing.

         (e) Financial Matters.

                  (i) Financial Statements. The Administrative Agent shall have
received the most recent audited Consolidated financial statements of the
Borrowers and their Subsidiaries, all in form and substance satisfactory to the
Administrative Agent.

                  (ii) Financial Condition Certificate. The Borrowers shall have
delivered to the Administrative Agent a certificate, in form and substance
satisfactory to the Administrative Agent, and certified as accurate by a
Responsible Officer, that (A) the Borrowers and each of their Subsidiaries are
each Solvent, (B) to the extent the contrary would result in a Material Adverse
Effect, each Borrower's payables are current and not past due, (C) attached
thereto is a pro forma balance sheet of the Borrowers and their Subsidiaries
setting forth on a pro forma basis the financial



                                      (23)
<PAGE>   28

condition of the Borrowers and their Subsidiaries on a Consolidated basis as of
a recent date, reflecting on a pro forma basis the effect of the transactions
contemplated herein, including all fees and expenses in connection therewith,
and evidencing compliance on a pro forma basis with the covenants contained in
Articles VIII and IX hereof, and (D) attached thereto are the financial
projections previously delivered to the Administrative Agent representing the
good faith opinions of the Borrowers and senior management thereof as to the
projected results contained therein.

                  (iii) Payment at Closing; Fee Letters. The Borrowers shall
have paid the fees set forth or referenced in Section 3.2 and any other accrued
and unpaid fees or commissions due hereunder (including, without limitation,
legal fees and expenses) to the Administrative Agent and Lenders, and to any
other Person such amount as may be due thereto in connection with the
transactions contemplated hereby, including all taxes, fees and other charges in
connection with the execution, delivery, recording, filing and registration of,
and title insurance for, any of the Loan Documents.

         (f) Miscellaneous.

                  (i) Notice of Account Designation. The Administrative Agent
shall have received a Notice of Account Designation specifying the account or
accounts to which the proceeds of any Loans made after the Closing Date are to
be disbursed.

                  (ii) Proceedings and Documents. All opinions, certificates and
other instruments and all proceedings in connection with the transactions
contemplated by this Agreement shall be reasonably satisfactory in form and
substance to the Lenders. The Lenders shall have received copies of all other
instruments and other evidence as the Lenders may reasonably request, in form
and substance satisfactory to the Lenders, with respect to the transactions
contemplated by this Agreement and the taking of all actions in connection
therewith.

                  (iii) Due Diligence and Other Documents. The Borrowers shall
have delivered to the Administrative Agent such other documents, certificates
and opinions with respect to this Agreement and the transactions contemplated
hereby as the Administrative Agent may reasonably request.

         SECTION 4.3 Conditions to All Extensions of Credit.

         The obligations of the Lenders to make any Extensions of Credit after
the Closing Date are subject to the satisfaction of the following conditions
precedent on the relevant Funding Date, as applicable:

         (a) Continuation of Representations and Warranties. The representations
and warranties contained in Article V shall be true and correct on and as of
such Funding Date with the same effect as if made on and as of such date, except
for any representation and warranty made as of an earlier date, which
representation and warranty shall remain true and correct as of such earlier
date.



                                      (24)
<PAGE>   29

         (b) No Existing Default. No Default or Event of Default shall have
occurred and be continuing hereunder on a Funding Date with respect to such
Extension of Credit or after giving effect to the Loans to be made on such date.

         (c) Officer's Compliance Certificate; Additional Documents. The
Administrative Agent shall have received the current Officer's Compliance
Certificate of each Borrower and each additional document, instrument, legal
opinion or other item of information reasonably requested by Administrative
Agent consistent with the provisions hereof.

         (d) Conditions Precedent. The conditions precedent described in Section
2.2(c) hereof shall have been satisfied or waived.

                                    ARTICLE V

                 REPRESENTATIONS AND WARRANTIES OF THE BORROWER

         SECTION 5.1 Representations and Warranties.

         To induce the Administrative Agent and Lenders to enter into this
Agreement and to induce the Lenders to make Extensions of Credit, each Borrower
hereby represents and warrants for itself (and for all Borrowers where so
indicated) to the Administrative Agent and Lenders both before and after giving
effect to the transactions contemplated hereunder that:

         (a) Organization; Power; Qualification. Each of the Borrowers and its
Subsidiaries is duly organized, validly existing and in good standing under the
laws of the jurisdiction of its incorporation or formation, has the power and
authority to own its properties and to carry on its business as now being and
hereafter proposed to be conducted and is duly qualified and authorized to do
business in each jurisdiction in which the character of its properties or the
nature of its business requires such qualification and authorization. The
jurisdictions in which the Borrowers and its Subsidiaries are organized and
qualified to do business as of the Closing Date are described on Schedule
5.1(a).

         (b) Ownership. Each Subsidiary of a Borrower as of the Closing Date is
listed on Schedule 5.1(b). As of the Closing Date, the capitalization of the
Borrowers and their Subsidiaries consists of the number of shares, authorized,
issued and outstanding, of such classes and series, with or without par value,
described on Schedule 5.1(b). All outstanding shares have been duly authorized
and validly issued and are fully paid and nonassessable. The shareholders of the
Subsidiaries of the Borrowers and the number of shares owned by each as of the
Closing Date are described on Schedule 5.1(b). As of the Closing Date, there are
no outstanding stock purchase warrants, subscriptions, options, securities,
instruments or other rights of any type or nature whatsoever, which are
convertible into, exchangeable for or otherwise provide for or permit the
issuance of capital stock of any of the Borrowers or their Subsidiaries, except
as described on Schedule 5.1(b).



                                      (25)
<PAGE>   30

         (c) Authorization of Agreement, Loan Documents and Borrowing. Each of
the Borrowers has the right, power and authority and has taken all necessary
corporate and other action to authorize its execution, delivery and performance
of this Agreement and each of the other Loan Documents to which it is a party in
accordance with their respective terms. This Agreement and each of the other
Loan Documents have been duly executed and delivered by the duly authorized
officers of the Borrowers party thereto, and each such document constitutes the
legal, valid and binding obligation of the Borrowers party thereto, enforceable
in accordance with its terms, except as such enforcement may be limited by
bankruptcy, insolvency, reorganization, moratorium or similar state or federal
debtor relief laws from time to time in effect which affect the enforcement of
creditors' rights in general and the availability of equitable remedies.

         (d) Compliance of Agreement, Loan Documents and Borrowing with Laws,
Etc. The execution, delivery and performance by the Borrowers of the Loan
Documents to which each such Person is a party, in accordance with their
respective terms, the borrowings hereunder and the transactions contemplated
hereby do not and will not, by the passage of time, the giving of notice or
otherwise, (i) require any Governmental Approval or violate any Applicable Law
relating to the Borrowers or any of their Subsidiaries, (ii) conflict with,
result in a breach of or constitute a default under the articles of
incorporation, bylaws or other organizational documents of any Borrower or any
indenture, agreement or other instrument to which such Person is a party or by
which any of its properties may be bound or any Governmental Approval relating
to such Person, or (iii) result in or require the creation or imposition of any
Lien upon or with respect to any property now owned or hereafter acquired by
such Person other than Liens arising under the Loan Documents.

         (e) Compliance with Law; Governmental Approvals. Except to the extent
that the failure of such to be the case would not result in a Material Adverse
Effect, each of the Borrowers and their Subsidiaries (i) has all Governmental
Approvals required by any Applicable Law for it to conduct its business,
including without limitation, all Permits (except those not yet issued in
connection with the Arkansas Improvements), each of which is in full force and
effect, is final and not subject to review on appeal and is not the subject of
any pending or, to the best of its knowledge, threatened attack by direct or
collateral proceeding, and (ii) is in compliance with each Governmental Approval
applicable to it and in compliance with all other Applicable Laws relating to it
or any of its respective properties.

         (f) Tax Returns and Payments. Except to the extent that the failure of
such to be the case would not result in a Material Adverse Effect, each of the
Borrowers and their Subsidiaries has duly filed or caused to be filed all
federal, state, local and other tax returns required by Applicable Law to be
filed, and has paid, or made adequate provision for the payment of, all federal,
state, local and other taxes, assessments and governmental charges or levies
upon it and its property, income, profits and assets which are due and payable.
Except to the extent that the failure of such to be the case would not result in
a Material Adverse Effect, no Governmental Authority has asserted any Lien or
other claim against any Borrower or Subsidiary thereof with respect to unpaid
taxes which has not been discharged or resolved. The charges, accruals and
reserves on the books of the Borrowers and any of its Subsidiaries in respect of
federal, state, local and other taxes for all Fiscal Years and portions thereof
since the organization of such Borrower and any of its Subsidiaries are



                                      (26)
<PAGE>   31

in the judgment of such Borrower adequate, and such Borrower does not anticipate
any additional taxes or assessments for any Fiscal Year prior to the current
Fiscal Year.

         (g) Intellectual Property Matters. Except to the extent that the
failure of such to be the case would not result in a Material Adverse Effect,
each of the Borrowers and their Subsidiaries owns or possesses rights to use all
franchises, licenses, copyrights, copyright applications, patents, patent rights
or licenses, patent applications, trademarks, trademark rights, trade names,
trade name rights, copyrights and rights with respect to the foregoing which are
required to conduct its business. Except to the extent that the failure of such
to be the case would not result in a Material Adverse Effect, no event has
occurred which permits, or after notice or lapse of time or both would permit,
the revocation or termination of any such rights, and neither any Borrower nor
any Subsidiary thereof is liable to any Person for infringement under Applicable
Law with respect to any such rights as a result of its business operations.

         (h) Environmental Matters. The following are true except to the extent
that the contrary would not result in a Material Adverse Effect:

                  (i) The properties owned, leased or operated by each of the
Borrowers and their Subsidiaries now or in the past do not contain, and to their
knowledge have not previously contained, any Hazardous Materials in amounts or
concentrations which (A) constitute or constituted a violation of applicable
Environmental Laws or (B) could give rise to liability under applicable
Environmental Laws;

                  (ii) Each Borrower, each Subsidiary and such properties and
all operations conducted in connection therewith are in compliance, and have
been in compliance, with all applicable Environmental Laws, and there is no
contamination at, under or about such properties or such operations which could
interfere with the continued operation of such properties or impair the fair
salable value thereof;

                  (iii) Neither any Borrower nor any Subsidiary thereof has
received any notice of violation, alleged violation, non-compliance, liability
or potential liability regarding environmental matters, Hazardous Materials, or
compliance with Environmental Laws, nor does any Borrower or any Subsidiary
thereof have knowledge or reason to believe that any such notice will be
received or is being threatened;

                  (iv) Hazardous Materials have not been transported or disposed
of to or from the properties owned, leased or operated by any Borrower and its
Subsidiaries in violation of, or in a manner or to a location which could give
rise to liability under, Environmental Laws, nor have any Hazardous Materials
been generated, treated, stored or disposed of at, on or under any of such
properties in violation of, or in a manner that could give rise to liability
under, any applicable Environmental Laws;

                  (v) No judicial proceedings or governmental or administrative
action is pending, or, to the knowledge of any Borrower, threatened, under any
Environmental Law to which such Borrower or any Subsidiary thereof is or will be
named as a party, nor are there any consent decrees



                                      (27)
<PAGE>   32

or other decrees, consent orders, administrative orders or other orders, or
other administrative or judicial requirements outstanding under any
Environmental Law with respect to any Borrower, any Subsidiary or such
properties or operations; and

                  (vi) There has been no release, or to the best of each
Borrower's knowledge, threat of release, of Hazardous Materials at or from
properties owned, leased or operated by such Borrower or any Subsidiary, now or
in the past, in violation of or in amounts or in a manner that could give rise
to liability under Environmental Laws.

         (i) ERISA.

                  (i) As of the Closing Date, neither any Borrower nor any ERISA
Affiliate maintains or contributes to, or has any obligation under, any Employee
Benefit Plans other than those identified on Schedule 5.1(i);

                  (ii) Each Borrower and each ERISA Affiliate is in compliance
in all material respects with all applicable provisions of ERISA and the
regulations and published interpretations thereunder with respect to all
Employee Benefit Plans except for any required amendments for which the remedial
amendment period as defined in Section 401(b) of the Code has not yet expired.
Each Employee Benefit Plan that is intended to be qualified under Section 401(a)
of the Code has been determined by the Internal Revenue Service to be so
qualified, and each trust related to such plan has been determined to be exempt
under Section 501(a) of the Code. No liability has been incurred by any Borrower
or any ERISA Affiliate which remains unsatisfied for any taxes or penalties with
respect to any Employee Benefit Plan or any Multiemployer Plan;

                  (iii) Except for the proposed merger of U.S. Lime's Employee
Stock Ownership Plan into its 401-K Pension Plan, no Pension Plan has been
terminated, nor has any accumulated funding deficiency (as defined in Section
412 of the Code) been incurred (without regard to any waiver granted under
Section 412 of the Code), nor has any funding waiver from the Internal Revenue
Service been received or requested with respect to any Pension Plan, nor has any
Borrower or any ERISA Affiliate failed to make any contributions or to pay any
amounts due and owing as required by Section 412 of the Code, Section 302 of
ERISA or the terms of any Pension Plan prior to the due dates of such
contributions under Section 412 of the Code or Section 302 of ERISA, nor has
there been any event requiring any disclosure under Section 4041(c)(3)(C) or
4063(a) of ERISA with respect to any Pension Plan;

                  (iv) Neither any Borrower nor any ERISA Affiliate has: (A)
engaged in a nonexempt prohibited transaction described in Section 406 of the
ERISA or Section 4975 of the Code, (B) incurred any liability to the PBGC which
remains outstanding other than the payment of premiums and there are no premium
payments which are due and unpaid, (C) failed to make a required contribution or
payment to a Multiemployer Plan, or (D) failed to make a required installment or
other required payment under Section 412 of the Code;

                  (v) No Termination Event has occurred or is reasonably
expected to occur; and



                                      (28)
<PAGE>   33

                  (vi) No proceeding, claim, lawsuit and/or investigation is
existing or, to the best knowledge of Borrowers after due inquiry, threatened
concerning or involving any (A) employee welfare benefit plan (as defined in
Section 3(1) of ERISA) currently maintained or contributed to by any Borrower or
any ERISA Affiliate, (B) Pension Plan or (C) Multiemployer Plan which could
result in a Material Adverse Effect.

         (j) Margin Stock. Neither any Borrower nor any Subsidiary thereof is
engaged principally or as one of its activities in the business of extending
credit for the purpose of "purchasing" or "carrying" any "margin stock" (as each
such term is defined or used in Regulation U of the Board of Governors of the
Federal Reserve System). No part of the proceeds of any of the Loans will be
used for purchasing or carrying margin stock or for any purpose which violates,
or which would be inconsistent with, the provisions of Regulation T, U or X of
such Board of Governors.

         (k) Government Regulation. Neither any Borrower nor any Subsidiary
thereof is an "investment company" or a company "controlled" by an "investment
company" (as each such term is defined or used in the Investment Company Act of
1940, as amended) and neither any Borrower nor any Subsidiary thereof is, or
after giving effect to any Extension of Credit will be, subject to regulation
under the Public Utility Holding Company Act of 1935 or the Interstate Commerce
Act, each as amended, or any other Applicable Law which limits its ability to
incur or consummate the transactions contemplated hereby.

         (l) Material Contracts. Schedule 5.1(l) sets forth a complete and
accurate list of all Material Contracts of each Borrower and its Subsidiaries in
effect as of the Closing Date not listed on any other Schedule hereto; other
than as set forth in Schedule 5.1(l), each such Material Contract is, and after
giving effect to the consummation of the transactions contemplated by the Loan
Documents will be, in full force and effect in accordance with the terms
thereof.

         (m) Employee Relations. Each of the Borrowers and their Subsidiaries
has a stable work force in place and is not, as of the Closing Date, party to
any collective bargaining agreement nor, as of the Closing Date, has any labor
union been recognized as the representative of its employees except as set forth
on Schedule 5.1(m). As of the Closing Date, the Borrower knows of no pending,
threatened or contemplated strikes, work stoppage or other collective labor
disputes involving its employees or those of its Subsidiaries.

         (n) Burdensome Provisions. Neither any Borrower nor any Subsidiary
thereof is a party to any indenture, agreement, lease or other instrument, or
subject to any corporate or partnership restriction, Governmental Approval or
Applicable Law which is so unusual or burdensome as in the foreseeable future
could be reasonably expected to have a Material Adverse Effect. The Borrowers
and their Subsidiaries do not presently anticipate that future expenditures
needed to meet the provisions of any statutes, orders, rules or regulations of a
Governmental Authority will be so burdensome as to have a Material Adverse
Effect.

         (o) Financial Statements. The Consolidated balance sheet of U.S. Lime
and its Subsidiaries as of December 31, 1998 and the related statements of
income and retained earnings



                                      (29)
<PAGE>   34

and cash flows for the Fiscal Year then ended, copies of which have been
furnished to the Administrative Agent and each Lender, are complete and correct
in all material respects and fairly present on a Consolidated basis the
financial condition of the Borrowers and their Subsidiaries as at such dates,
and the results of their operations and changes of financial position for the
periods then ended. All such financial statements, including the related
schedules and notes thereto, have been prepared in accordance with GAAP.

         (p) No Material Adverse Change. Since December 31, 1998 there has been
no material adverse change in the properties, business, operations, prospects,
or condition (financial or otherwise) of the Borrower and its Subsidiaries and
no event has occurred or condition arisen that could reasonably be expected to
have a Material Adverse Effect.

         (q) Solvency. As of the Closing Date and after giving effect to each
Extension of Credit made hereunder, each Borrower and each of its Subsidiaries
will be Solvent.

         (r) Titles to Properties. To the extent necessary to the conduct of its
business, each of the Borrowers and their Subsidiaries has such title to the
real property owned by it and valid and legal title to or a leasehold interest
in all of its personal property and assets, including, but not limited to, those
reflected on the balance sheet of the Borrowers and their Subsidiaries delivered
pursuant to Section 5.1(o), except those which have been disposed of by the
Borrowers or their Subsidiaries subsequent to December 31, 1998 which
dispositions have been in the ordinary course of business or as otherwise
expressly permitted hereunder.

         (s) Liens. Except as described on Schedule 9.3, none of the properties
and assets of the Borrowers or any Subsidiary thereof is subject to any Lien,
except Liens permitted pursuant to Section 9.3. No financing statement under the
Uniform Commercial Code of any state which names any Borrower or any Subsidiary
thereof or any of their respective trade names or divisions as debtor and which
has not been terminated or assigned to the Administrative Agent for the benefit
of Lenders, has been filed in any state or other jurisdiction and neither any
Borrower nor any Subsidiary thereof has signed any such financing statement or
any security agreement authorizing any secured party thereunder to file any such
financing statement, except to perfect those Liens permitted by Section 9.3
hereof.

         (t) Debt and Guaranty Obligations. Schedule 5.1(t) is a complete and
correct listing of all Debt and Guaranty Obligations of each Borrower and its
Subsidiaries as of the Closing Date in excess of $1,000,000. The Borrowers and
their Subsidiaries have performed and are in compliance with all of the terms of
such Debt and Guaranty Obligations and all instruments and agreements relating
thereto, and no default or event of default, or event or condition which with
notice or lapse of time or both would constitute such a default or event of
default on the part of the Borrower or its Subsidiaries exists with respect to
any such Debt or Guaranty Obligation.

         (u) Litigation. Except for matters existing on the Closing Date and set
forth on Schedule 5.1(u), there are no actions, suits or proceedings pending
nor, to the knowledge of any Borrower, threatened against or in any other way
relating adversely to or affecting such Borrower, Borrowers, or any Subsidiary
thereof or any of their respective properties in any court or before any



                                      (30)
<PAGE>   35

arbitrator of any kind or before or by any Governmental Authority which if
determined adversely to such Borrower or Subsidiary could result in a Material
Adverse Effect.

         (v) Absence of Defaults. No event has occurred or is continuing which
constitutes a Default or an Event of Default, or which constitutes, or which
with the passage of time or giving of notice or both would constitute, a Default
or Event of Default by any Borrower or any Subsidiary thereof under any
judgment, decree or order to which any Borrower or its Subsidiaries is a party
or by which any Borrower or its Subsidiaries or any of their respective
properties may be bound.

         (w) Accuracy and Completeness of Information. All written information,
reports and other papers and data produced by or on behalf of the Borrowers or
any Subsidiary thereof and furnished to the Lenders in connection with this
Agreement and the transactions contemplated hereby were, at the time the same
were so furnished, complete and correct in all respects to the extent necessary
to give the recipient a true and accurate knowledge of the subject matter. No
document furnished or written statement made to the Administrative Agent or the
Lenders by any Borrower or any Subsidiary thereof in connection with the
negotiation, preparation or execution of this Agreement or any of the Loan
Documents contains or will contain any untrue statement of a fact material to
the creditworthiness of any Borrower or its Subsidiaries or omits or will omit
to state a fact necessary in order to make the statements contained therein not
misleading. No Borrower is aware of any facts which it has not disclosed in
writing to the Administrative Agent having a Material Adverse Effect, or insofar
as such Borrower can now foresee, could reasonably be expected to have a
Material Adverse Effect.

         (x) Texas Real Estate. Except as disclosed in Schedule 5.1(x) as the
same may have been supplemented, to the best of each Borrower's knowledge after
due inquiry, (i) from the date of TLC's acquisition of its Real Estate, neither
TLC nor any other Borrower has received any claim for, or paid any, royalties,
fees or other payments for the extraction of oil, gas, or other hydrocarbons,
limestone, gravel, crushed rock, sand or other minerals of any kind or character
over, under or produced from Real Estate owned by TLC, and (ii) none of the
mineral rights reserved or conveyed to third parties listed on Schedule B to
Commonwealth Land Title Insurance Company Commitment for the Real Estate owned
by TLC delivered pursuant to Section 4.2(c)(iv) hereof has interfered in any
material respect with the operations of TLC's business.



                                      (31)
<PAGE>   36

         SECTION 5.2 Survival of Representations and Warranties, Etc.

         All representations and warranties set forth in this Article V and all
representations and warranties contained in any certificate, or any of the Loan
Documents (including but not limited to any such representation or warranty made
in or in connection with any amendment thereto) shall constitute representations
and warranties made under this Agreement. All representations and warranties
made under this Agreement shall be made or deemed to be made at and as of the
Closing Date, shall survive the Closing Date and shall not be waived by the
execution and delivery of this Agreement, any investigation made by or on behalf
of the Lenders or any borrowing hereunder.

                                   ARTICLE VI

                        FINANCIAL INFORMATION AND NOTICES

         Until all the Obligations have been paid and satisfied in full and the
Commitments terminated, unless consent has been obtained in the manner set forth
in Section 12.11 hereof, the Borrowers will furnish or cause to be furnished to
the Administrative Agent and to the Lenders at their respective addresses as set
forth on Schedule 1, or such other office as may be designated by the
Administrative Agent and Lenders from time to time:

         SECTION 6.1 Financial Statements and Projections.

         (a) Quarterly Financial Statements. As soon as practicable and in any
event within fifty (50) days after the end of the first three (3) fiscal
quarters of each Fiscal Year, an unaudited Consolidated and consolidating
balance sheet of the Borrowers and their Subsidiaries as of the close of such
fiscal quarter and unaudited Consolidated and consolidating statements of
income, retained earnings and cash flows for the fiscal quarter then ended and
that portion of the Fiscal Year then ended, including the notes thereto, all in
reasonable detail setting forth in comparative form the corresponding figures
for the preceding Fiscal Year and prepared by the Borrowers in accordance with
GAAP (except for the absence of footnotes) and, if applicable, containing
disclosure of the effect on the financial position or results of operations of
any change in the application of accounting principles and practices during the
period, and certified by the principal financial and accounting officer of each
Borrower to present fairly in all material respects the financial condition of
the Borrowers and their Subsidiaries as of their respective dates and the
results of operations of the Borrowers and their Subsidiaries for the respective
periods then ended, subject to normal year end adjustments.

         (b) Annual Financial Statements. As soon as practicable and in any
event within one hundred twenty-five (125) days after the end of each Fiscal
Year, an audited Consolidated balance sheet of the Borrowers and their
Subsidiaries as of the close of such Fiscal Year and audited Consolidated
statements of income, retained earnings and cash flows for the Fiscal Year then
ended, including the notes thereto, all in reasonable detail setting forth in
comparative form the corresponding figures for the preceding Fiscal Year and
prepared by an independent certified public accounting firm acceptable to the
Administrative Agent in accordance with GAAP and, if applicable, containing
disclosure of the effect on the financial position or results of operation of
any



                                      (32)
<PAGE>   37

change in the application of accounting principles and practices during the
year, and accompanied by a report thereon by such certified public accountants
that is not qualified with respect to scope limitations imposed by any Borrower
or any of its Subsidiaries or with respect to accounting principles followed by
any Borrower or any of its Subsidiaries not in accordance with GAAP.

         (c) Annual Business Plan and Financial Projections. As soon as
practicable and in any event prior to the beginning of each Fiscal Year, a
business plan of the Borrower and its Subsidiaries for the ensuing four fiscal
quarters, and a condensed financial plan for the succeeding four quarters, such
plans to be prepared in accordance with sound financial and managerial practices
and to include, on a quarterly basis, the following: a quarterly operating and
capital budget, a projected income statement, statement of cash flows and
balance sheet and a report containing management's discussion and analysis of
such projections, accompanied by a certificate from the principal financial and
accounting officer of each of the Borrowers to the effect that, to the best of
such officer's knowledge, such projections are good faith estimates of the
financial condition and operations of such Borrower and its Subsidiaries for
such eight quarter period.

         SECTION 6.2 Officer's Compliance Certificate.

         At each time financial statements are delivered pursuant to Sections
6.1 (a) or (b) and at such other times as the Administrative Agent shall
reasonably request, a certificate of the principal financial and accounting
officer or the treasurer of the Borrowers in the form of Exhibit E attached
hereto (an "Officer's Compliance Certificate").

         SECTION 6.3 Accountants' Certificate.

         At each time financial statements are delivered pursuant to Section
6.1(b), a certificate of the independent public accountants certifying such
financial statements addressed to the Administrative Agent for the benefit of
the Lenders:

         (a) stating that in making the examination necessary for the
certification of such financial statements, they obtained no knowledge of any
Default or Event of Default or, if such is not the case, specifying such Default
or Event of Default and its nature and period of existence; and

         (b) including the calculations prepared by such accountants required to
establish whether or not the Borrowers and their Subsidiaries are in compliance
with the financial covenants set forth in Article VIII hereof as at the end of
each respective period.

         (c) including a fully executed copy of a letter from such accountants
to the Borrowers (i) expressly acknowledging that a primary intent of the
Borrowers (with respect to such statements) is for such accountants' examination
and report with respect to such statements of the Borrowers to benefit or
influence the Lenders (A) in connection with Extensions of Credit and other
financial accommodations to the Borrowers from time to time, or (B) otherwise in
connection with the preparation, review, execution, delivery, amendment,
modification, administration, collection and/or enforcement of the Loan
Documents, and (ii) expressly authorizing the Lenders to



                                      (33)
<PAGE>   38

rely on the examination and report of such accountants with respect to the
audited financial statements of the Borrower as of and for such Fiscal Year then
ending.

         SECTION 6.4 Other Reports.

         (a) Promptly upon receipt thereof, copies of all reports, if any,
submitted to the Borrowers or its Board of Directors by its independent public
accountants in connection with their auditing function, including, without
limitation, any management report and any management responses thereto; and

         (b) Such other information regarding the operations, business affairs
and financial condition of the Borrowers or any of their Subsidiaries as the
Administrative Agent or any Lender may reasonably request, including, without
limitation, all business and financial information provided to the stockholders
of U.S. Lime, the Securities and Exchange Commission, the NASDAQ or any exchange
on which U.S. Lime's equity securities are now or hereafter traded.

         SECTION 6.5. Notice of Litigation and Other Matters.

         Prompt (but in no event later than ten (10) days after an officer of
any Borrower obtains knowledge thereof) telephonic and written notice of each of
the following events, in each case to the extent that such event would result in
a Material Adverse Effect:

         (a) the commencement of all proceedings and investigations by or before
any Governmental Authority and all actions and proceedings in any court or
before any arbitrator against or involving any Borrower or any Subsidiary
thereof or any of their respective properties, assets or businesses;

         (b) any notice of any violation received by any Borrower or any
Subsidiary thereof from any Governmental Authority including, without
limitation, any notice of violation of Environmental Laws or any Permit;

         (c) any labor controversy that has resulted in, or threatens to result
in, a strike or other work action against any Borrower or any Subsidiary
thereof;

         (d) any attachment, judgment, lien, levy or order exceeding $1,000,000
that may be assessed against or threatened against any Borrower or any
Subsidiary thereof;

         (e) any Default or Event of Default, or any event which constitutes or
which with the passage of time or giving of notice or both would constitute a
default or event of default under any Material Contract to which any Borrower or
any of its Subsidiaries is a party or by which any Borrower or any Subsidiary
thereof or any of their respective properties may be bound;

         (f) (i) any unfavorable determination letter from the Internal Revenue
Service regarding the qualification of an Employee Benefit Plan under Section
401(a) of the Code (along with a copy of such letter, (ii) all notices received
by any Borrower or any ERISA Affiliate of the PBGC's intent to terminate any
Pension Plan or to have a trustee appointed to administer any Pension Plan,



                                      (34)
<PAGE>   39

(iii) all notices received by any Borrower or any ERISA Affiliate from a
Multiemployer Plan sponsor concerning the imposition or amount of withdrawal
liability pursuant to Section 4202 of ERISA and (iv) any Borrower obtaining
knowledge or reason to know that any Borrower or any ERISA Affiliate has filed
or intends to file a notice of intent to terminate any Pension Plan under a
distress termination within the meaning of Section 4041(c) of ERISA; and

         (g) any event which makes any of the representations set forth in
Section 5.1 inaccurate in any respect.

                  SECTION 6.6 Accuracy of Information.

         All written information, reports, statements and other papers and data
furnished by or on behalf of the Borrowers to the Administrative Agent or any
Lender (other than financial forecasts) whether pursuant to this Article VI or
any other provision of this Agreement, or any of the Security Documents, shall
be, at the time the same is so furnished, complete and correct in all material
respects to the extent necessary to give the Administrative Agent or any Lender
complete, true and accurate knowledge of the subject matter based on each
Borrower's knowledge thereof.

                                   ARTICLE VII

                              AFFIRMATIVE COVENANTS

         Until all of the Obligations have been paid and satisfied in full and
the Commitments terminated, unless consent has been obtained in the manner
provided for in Section 12.11, each Borrower will, and will cause each of its
Subsidiaries to:

         SECTION 7.1 Preservation of Corporate Existence and Related Matters.

         Except as permitted by Section 9.5, preserve and maintain its separate
corporate existence and all rights, franchises, licenses and privileges
necessary to the conduct of its business, including without limitation, all
Permits when and as necessary for the conduct of each Borrower's business as
then contemplated and qualify and remain qualified as a foreign corporation and
authorized to do business in each jurisdiction where the nature and scope of its
activities require it to so qualify under Applicable Law.

         SECTION 7.2 Maintenance of Property.

         In addition to the requirements of any of the Security Documents,
protect and preserve all properties useful in and material to its business the
lack of which could result in a Material Adverse Effect, including copyrights,
patents, trade names and trademarks; maintain in good working order and
condition all buildings, equipment and other tangible real and personal property
the lack of which could result in a Material Adverse Effect; and from time to
time make or cause to be made all renewals, replacements and additions to such
property necessary for the conduct of its business, so that the business carried
on in connection therewith may be properly and advantageously conducted at all
times.



                                      (35)
<PAGE>   40

         SECTION 7.3 Insurance.

         Maintain insurance with financially sound and reputable insurance
companies against such risks and in such amounts as are customarily maintained
by similar businesses and as may be required by Applicable Law and as are
required by any Security Documents, and on the Closing Date and from time to
time thereafter deliver to the Administrative Agent upon its request a detailed
list of the insurance then in effect, stating the names of the insurance
companies, the amounts and rates of the insurance, the dates of the expiration
thereof and the properties and risks covered thereby.

         SECTION 7.4 Accounting Methods and Financial Records.

         Maintain a system of accounting, and keep such books, records and
accounts (which shall be true and complete in all material respects) as may be
required or as may be necessary to permit the preparation of financial
statements in accordance with GAAP and in compliance with the regulations of any
Governmental Authority having jurisdiction over it or any of its properties.

         SECTION 7.5 Payment and Performance of Obligations.

         Pay and perform all Obligations under this Agreement and the other Loan
Documents, and to the extent that the failure to do so could result in a
Material Adverse Effect, pay or perform (a) all taxes, assessments and other
governmental charges that may be levied or assessed upon it or any of its
property, and (b) all other indebtedness, obligations and liabilities in
accordance with customary trade practices; provided, that such Borrower or such
Subsidiary may contest any item described in clauses (a) or (b) of this Section
7.5 in good faith so long as adequate reserves are maintained with respect
thereto in accordance with GAAP.

         SECTION 7.6 Compliance With Laws and Approvals.

         Observe and remain in compliance with all Applicable Laws and maintain
in full force and effect all Governmental Approvals, in each case applicable to
the conduct of its business to the extent that the failure to do so could result
in a Material Adverse Effect,.

         SECTION 7.7 Environmental Laws.

         In addition to and without limiting the generality of Section 7.6, to
the extent that the failure to do so could result in a Material Adverse Effect,
(a) comply with, and ensure such compliance by all tenants and subtenants with
all applicable Environmental Laws and obtain and comply with and maintain, and
ensure that all tenants and subtenants obtain and comply with and maintain, any
and all licenses, approvals, notifications, registrations or permits required by
applicable Environmental Laws, (b) conduct and complete all investigations,
studies, sampling and testing, and all remedial, removal and other actions
required under Environmental Laws, and promptly comply with all lawful orders
and directives of any Governmental Authority regarding Environmental Laws, and
(c) defend, indemnify and hold harmless the Administrative Agent and the
Lenders, and their respective parents, Subsidiaries, Affiliates, employees,
agents, officers and directors, from and



                                      (36)
<PAGE>   41

against any claims, demands, penalties, fines, liabilities, settlements,
damages, costs and expenses of whatever kind or nature known or unknown,
contingent or otherwise, arising out of, or in any way relating to the presence
of Hazardous Materials, or the violation of, noncompliance with or liability
under any Environmental Laws applicable to the operations of the Borrower or
such Subsidiary, or any orders, requirements or demands of Governmental
Authorities related thereto, including, without limitation, reasonable
attorney's and consultant's fees, investigation and laboratory fees, response
costs, court costs and litigation expenses, except to the extent that any of the
foregoing directly result from the gross negligence or willful misconduct of the
party seeking indemnification therefor.

         SECTION 7.8 Compliance with ERISA.

         In addition to and without limiting the generality of Section 7.6, to
the extent that the failure to do so could result in a Material Adverse Effect
(a) comply with all applicable provisions of ERISA and the regulations and
published interpretations thereunder with respect to all Employee Benefit Plans,
(b) not take any action or fail to take action the result of which could be a
liability to the PBGC or to a Multiemployer Plan, (c) not participate in any
prohibited transaction that could result in any civil penalty under ERISA or tax
under the Code, (d) operate each Employee Benefit Plan in such a manner that
will not incur any tax liability under Section 4980B of the Code or any
liability to any qualified beneficiary as defined in Section 4980B of the Code
and (e) furnish to the Administrative Agent upon the Administrative Agent's
request such additional information about any Employee Benefit Plan as may be
reasonably requested by the Administrative Agent.

         SECTION 7.9 Compliance With Agreements.

         Comply in all material respects with each term, condition and provision
of all leases, agreements and other instruments entered into in the conduct of
its business the noncompliance with which could cause a Material Adverse Effect
including without limitation, any Material Contracts.

         SECTION 7.10 Conduct of Business.

         Engage only in businesses in substantially the same fields as the
businesses conducted on the Closing Date and in lines of business reasonably
related thereto.

         SECTION 7.11 Visits and Inspections.

         Permit representatives of the Administrative Agent or any Lender, from
time to time, at reasonable times and upon reasonable advance notice, to visit
and inspect its properties; inspect, audit and make extracts from its books,
records and files, including, but not limited to, management letters prepared by
independent accountants; and discuss with its principal officers, and its
independent accountants, its business, assets, liabilities, financial condition,
results of operations and business prospects.

         SECTION 7.12 Year 2000 Compatibility.



                                      (37)
<PAGE>   42

         Take all actions reasonably necessary to assure that each Borrower's
computer based systems are able to operate and effectively process data which
includes dates on and after January 1, 2000. At the request of the
Administrative Agent, the Borrowers shall provide reasonable assurances
satisfactory to the Administrative Agent of each Borrower's Year 2000
compatibility.

         SECTION 7.13 Further Assurances.

         Make, execute and deliver all such additional and further acts, things,
deeds and instruments as the Administrative Agent or any Lender may reasonably
require to document and consummate the transactions contemplated hereby and to
vest completely in and assure the Administrative Agent and the Lenders their
respective rights under this Agreement, the Notes, and the other Loan Documents.
Borrowers agree to cause the lender now or hereafter making available the
Working Capital Facility to execute and deliver to Administrative Agent an
intercreditor agreement, providing for a standstill period of 15 days upon the
occurrence of an Event of Default hereunder or under the Working Capital
Facility, in form and substance reasonably acceptable to Administrative Agent.

                                  ARTICLE VIII

                               FINANCIAL COVENANTS

         Until all of the Obligations have been paid and satisfied in full and
the Commitments terminated, unless consent has been obtained in the manner set
forth in Section 12.11 hereof, the Borrowers and their Subsidiaries on a
Consolidated basis will not:

         SECTION 8.1 Debt Service Coverage Ratio.

         As of any fiscal quarter end, permit the Debt Service Coverage Ratio on
such date for the period of four (4) consecutive fiscal quarters ending on or
immediately prior to such date to be less than 1.10 to 1.0 for all such
four-quarter periods ending on and before December 31, 2001, and 1.20 to 1.0 for
all for all such four-quarter periods ending on and after March 31, 2002.

         SECTION 8.2. Tangible Net Worth.

         Permit Tangible Net Worth as of the last day of any fiscal quarter to
be less than the sum of $25,000,000 plus 50% of Borrower's cumulative Net Income
from January 1, 1999 calculated for each succeeding fiscal quarter through the
last day of such fiscal quarter.

                                   ARTICLE IX

                               NEGATIVE COVENANTS

         Until all of the Obligations have been paid and satisfied in full and
the Commitments terminated, unless consent has been obtained in the manner set
forth in Section 12.11 hereof, none of the Borrowers will, or will permit any of
its Subsidiaries to:



                                      (38)
<PAGE>   43

         SECTION 9.1 Limitations on Debt.

         Create, incur, assume or suffer to exist any Debt except:

         (a) the Obligations;

         (b) Trade payables incurred in the ordinary course of business;

         (c) Indebtedness incurred in connection with performance, bonds, mining
land reclamation bonds, other security bonds, and letters of credit to secure
workers compensation claims which do not exceed in the aggregate face amount
$750,000 at any one time;

         (d) Indebtedness outstanding under the Working Capital Facility not to
exceed $4,000,000 in aggregate principal amount outstanding at any one time;

         (e) Subordinated Debt;

         (f) Debt existing on the Closing Date and not otherwise permitted under
this Section 9.1, as set forth on Schedule 5.1(t) and the renewal and
refinancing thereof (but not the increase in the aggregate principal amount
thereof);

         (g) Debt consisting of Guaranty Obligations permitted by Section 9.2;
and

         (h) Debt in addition to the foregoing which, immediately after giving
affect thereto on a pro forma basis, would not cause Borrower's Debt Service
Coverage Ratio to be less than 1.25 to 1.0;

provided, that no agreement or instrument with respect to Debt permitted to be
incurred by this Section shall restrict, limit or otherwise encumber (by
covenant or otherwise) the ability of any Subsidiary of any Borrower to make any
payment to another Borrower or any of its Subsidiaries (in the form of
dividends, intercompany advances or otherwise) for the purpose of enabling the
Borrowers to pay the Obligations.



                                      (39)
<PAGE>   44

         SECTION 9.2 Limitations on Guaranty Obligations.

         Create, incur, assume or suffer to exist any Guaranty Obligations
except Guaranty Obligations disclosed on Schedule 5.1(t) as the same may have
been supplemented and Guaranty Obligations in favor of the Administrative Agent
for the benefit of the Administrative Agent and the Lenders.

         SECTION 9.3 Limitations on Liens.

         Create, incur, assume or suffer to exist, any Lien on or with respect
to any of its assets or properties (including without limitation shares of
capital stock or other ownership interests owned by it), real or personal,
whether now owned or hereafter acquired, except:

         (a) Liens for taxes, assessments and other governmental charges or
levies not yet due or as to which the period of grace, if any, related thereto
has not expired or which are being contested in good faith and by appropriate
proceedings if adequate reserves are maintained to the extent required by GAAP;

         (b) the claims of materialmen, mechanics, carriers, warehousemen,
processors or landlords for labor, materials, supplies or rentals incurred in
the ordinary course of business, (i) which are not overdue for a period of more
than thirty (30) days or (ii) which are being contested in good faith and by
appropriate proceedings and for which adequate reserves in accordance with GAAP
have been set aside; provided however, that with respect to any one or more
mechanics liens or security interests filed against any portion of the Real
Estate, or any interest therein, by reason of work, labor, services or materials
supplied or claimed to have been supplied, or any municipal lien or other lien
or encumbrance, other than the Mortgages and Deeds of Trust, in an amount not to
exceed $750,000 in the aggregate recorded or filed and not discharged on or
before June 30, 2001, then Administrative Agent may, at its option, pay and
discharge said lien or encumbrance, in which case the sum which Administrative
Agent shall have so paid shall be considered as part of the Loan and shall be
payable immediately by Borrowers, and if not so paid, shall bear interest at the
rate applicable to Tranche A of the Loan.

         (c) Liens consisting of deposits or pledges made in the ordinary course
of business in connection with, or to secure payment of, obligations under
workers' compensation, unemployment insurance or similar legislation or
obligations not to exceed $450,000.

         (d) Liens constituting encumbrances in the nature of zoning
restrictions, easements and rights or restrictions of record on the use of real
property, which in the aggregate are not substantial in amount and which do not,
in any case, detract from the value of such property or impair the use thereof
in the ordinary conduct of business;

         (e) Liens of the Administrative Agent for the benefit of the
Administrative Agent and the Lenders;



                                      (40)
<PAGE>   45

         (f) Liens not otherwise permitted by this Section 9.3 and in existence
on the Closing Date and described on Schedule 9.3;

         (g) Liens securing Debt permitted under Section 9.1(h); provided that
(i) such Liens shall be created substantially simultaneously with the
acquisition of the related asset, (ii) such Liens do not at any time encumber
any property other than the property financed by such Debt, (iii) the amount of
Debt secured thereby is not increased and (iv) the principal amount of Debt
secured by any such Lien shall at no time exceed one hundred percent (100%) of
the original purchase price of such property at the time it was acquired.

         (h) Liens on Borrowers' accounts receivable, books and records,
inventory, and the proceeds thereof securing the Working Capital Facility; and

         (i) Liens which in the aggregate secure obligations not more than
$250,000.

         SECTION 9.4 Limitations on Loans, Advances, Investments and
Acquisitions.

         Purchase, own, invest in or otherwise acquire, directly or indirectly,
any capital stock, interests in any partnership or joint venture (including
without limitation the creation or capitalization of any Subsidiary), evidence
of Debt or other obligation or security, substantially all or a portion of the
business or assets of any other Person or any other investment or interest
whatsoever in any other Person, or make or permit to exist, directly or
indirectly, any loans, advances or extensions of credit to, or any investment in
cash or by delivery of property in, any Person (each an "Investment") except:

         (a) Investments existing as of December 31, 1998 and described on
Schedule 9.4 and Investments resulting from transactions permitted by Sections
9.1, 9.2, 9.5 and 9.6);

         (b) Investments in (i) marketable direct obligations issued or
unconditionally guaranteed by the United States of America or any agency thereof
maturing within one year from the date of acquisition thereof, (ii) commercial
paper maturing no more than one year from the date of creation thereof and
currently having the highest rating obtainable from either Standard & Poor's
Ratings Services, a division of The McGraw-Hill Companies, Inc. or Moody's
Investors Service, Inc., (iii) certificates of deposit maturing no more then one
year from the date of acquisition thereof issued by commercial banks
incorporated under the laws of the United States of America, each having
combined capital, surplus and undivided profits of not less than $100,000,000
and having a rating of "A" or better by a nationally recognized rating agency;
provided, that the aggregate amount invested in such certificates of deposit
shall not at any time exceed $5,000,000 for any one such certificate of deposit
and $10,000,000 for any one such bank, (iv) Euro dollar certificates of deposit
maturing within one year after acquisition issued by any bank having combined
capital, surplus, and undivided profits not less than $1 billion; or (v)
repurchase agreements expiring within 30 days after acquisition for obligations
of the type described in subsection (b)(i) hereof with a bank or trust company
meeting the requirements of subsections (b)(iii) or (b)(iv) hereof;



                                      (41)
<PAGE>   46

         (c) investments by a Borrower or Subsidiary in any Subsidiary or
Borrower now owned or hereafter acquired;

         (d) Investments other than as permitted in Sections 9.4(a), (b) and (c)
("Basket Investments") which, together with all Dividends paid under Section
9.7(c) and all Basket Investments since December 31, 1998 on a cumulative basis,
would (i) leave Borrowers Solvent, (ii) not cause, or with notice and/or the
passage of time or both, result in any Default or Event of Default, and (iii)
not exceed the sum of (A) $2,500,000, plus 50% of Borrowers' cumulative Net
Income since December 31, 1998, and (B) the Net Cash Proceeds from the sale of
any capital stock (or indebtedness convertible into capital stock).

         SECTION 9.5 Limitations on Mergers and Liquidation.

         Provided that no Event of Default then exists or would occur as a
result thereof, merge, consolidate or enter into any similar combination with
any other Person or liquidate, wind-up or dissolve itself (or suffer any
liquidation or dissolution) except:

         (a) any Wholly-Owned Subsidiary of a Borrower may merge with any other
Wholly-Owned Subsidiary of any Borrower;

         (b) any Wholly-Owned Subsidiary of a Borrower may wind-up into such
Borrower or any other Wholly-Owned Subsidiary of such Borrower.

         (c) any Borrower, or any Subsidiary thereof, may merge, consolidate or
enter into any similar combination with, or wind-up or dissolve itself into, any
Person which (i) expressly assumes joint and several liability for the
Obligations and becomes a party to this Agreement as a Borrower, (ii) is
incorporated under the laws of the United States or any State thereof; and (iii)
is Solvent after giving affect thereto.

         SECTION 9.6 Limitations on Sale of Assets.

         Provided that no Event of Default then exists or would occur as a
result thereof, convey, sell, lease, assign, transfer or otherwise dispose of
any of its property, business or assets (including, without limitation, the sale
of any receivables and leasehold interests and any sale-leaseback or similar
transaction), whether now owned or hereafter acquired except:

         (a) the sale of inventory in the ordinary course of business;

         (b) the sale of obsolete assets no longer used or usable in the
business of the Borrowers or any of their Subsidiaries;

         (c) the transfer of assets to a Borrower of any Wholly-Owned Subsidiary
of such Borrower pursuant to Section 9.5(c);

         (d) the sale or discount without recourse of accounts receivable
arising in the ordinary course of business in connection with the compromise or
collection thereof;



                                      (42)
<PAGE>   47

         (e) the sale of all or substantially all of a Borrower's or a
Wholly-Owned Subsidiary's assets to a Person with which such Borrower or
Wholly-Owned Subsidiary could have merged pursuant to Section 9.5(c) hereof; and

         (f) the sale of more than five percent (5.0%) of the value of a
Borrower's assets if the Net Cash Proceeds thereof are used to prepay the Loan
or invested within 12 months from the date of sale in capital assets to be used
by such Borrower in its current line or lines of business and which are subject
to the lien of Lenders securing the Obligations.

         SECTION 9.7 Limitations on Dividends and Distributions.

         Declare or pay any dividends upon any of its capital stock; purchase,
redeem, retire or otherwise acquire, directly or indirectly, any shares of its
capital stock, or make any distribution of cash property or assets among the
holders of shares of its capital stock, or make any change in its capital
structure (each a "Dividend"); provided that:

         (a) any Borrower or any Subsidiary may pay Dividends in shares of its
own capital stock;

         (b) any Subsidiary may pay cash Dividends to a Borrower; and

         (c) Borrowers may pay other Dividends which, together with all
Dividends made under this Section 9.7(c) and all Basket Investments since
December 31, 1998 on a cumulative basis, would (i) leave Borrowers Solvent, (ii)
not cause, or with notice and/or the passage of time or both, result in any
Default or Event of Default, and (iii) not exceed the sum of (A) $2,500,000,
plus 50% of Borrowers' cumulative Net Income since December 31, 1998, and (B)
the Net Cash Proceeds from the sale of any capital stock (or indebtedness
convertible into capital stock).

         SECTION 9.8 Limitations on Exchange and Issuance of Capital Stock.

         Issue, sell or otherwise dispose of any class or series of capital
stock that, by its terms or by the terms of any security into which it is
convertible or exchangeable, is, or upon the happening of an event or passage of
time would be, (a) convertible or exchangeable into Debt (unless such Debt is
otherwise permitted under Section 9.1) or (b) required to be redeemed or
repurchased, including at the option of the holder, in whole or in part, or has,
or upon the happening of an event or passage of time would have, a redemption or
similar payment due.

         SECTION 9.9 Transactions with Affiliates.

         Directly or indirectly (a) make any loan or advance to, or purchase or
assume any note or other obligation to or from, any of its officers, directors,
or Affiliates, or to or from any member of the immediate family of any of its
officers, directors, shareholders or other Affiliates, or subcontract any
operations to any of its Affiliates or (b) enter into, or be a party to, any
other transaction with any of its Affiliates, except pursuant to the reasonable
requirements of its business and upon fair and reasonable terms that are fully
disclosed to and approved in writing by the Required Lenders



                                      (43)
<PAGE>   48

prior to the consummation thereof and are no less favorable to it than it would
obtain in a comparable arm's length transaction with a Person not its Affiliate.

         SECTION 9.10 Certain Accounting Changes.

         Change its Fiscal Year end, or make any change in its accounting
treatment and reporting practices except as required by GAAP.

         SECTION 9.11 Amendments; Payments and Prepayments of Subordinated Debt.

         Amend or modify (or permit the modification or amendment of) any of the
terms or provisions of any Subordinated Debt in a manner prejudicial, in the
sole determination of the Administrative Agent, to the interests of the Lenders,
or cancel or forgive, make any voluntary or optional payment or prepayment on,
or redeem or acquire for value (including without limitation by way of
depositing with any trustee with respect thereto money or securities before due
for the purpose of paying when due) any Subordinated Debt except to the extent
treated as a Dividend and, as such permitted by Section 9.7.

         SECTION 9.12 Restrictive Agreements.

         Enter into any Debt which contains any negative pledge on assets
restricting grants to the Administrative Agent for the benefit of the Lenders,
or which restricts, limits or otherwise encumbers its ability to incur Liens in
favor of the Administrative Agent for the benefit of the Lenders on or with
respect to any of its assets or properties other than the assets or properties
securing such Debt.

                                    ARTICLE X

                              DEFAULT AND REMEDIES

         SECTION 10.1. Events of Default.

         Each of the following shall constitute an Event of Default, whatever
the reason for such event and whether it shall be voluntary or involuntary or be
effected by operation of law or pursuant to any judgment or order of any court
or any order, rule or regulation of any Governmental Authority or otherwise:

         (a) Default in Payment of Principal of Loans. The Borrowers shall
default in any payment of principal of any Loan or Note when and as due (whether
at maturity, by reason of acceleration or otherwise).

         (b) Other Payment Default. The Borrowers shall default in the payment
when and as due (whether at maturity, by reason of acceleration or otherwise) of
interest on any Loan or Note or the payment of any other Obligation, and such
default shall continue unremedied for five (5) Business Days.



                                      (44)
<PAGE>   49

         (c) Misrepresentation. Any representation or warranty made or deemed to
be made by the Borrowers or any of their Subsidiaries under this Agreement, any
Loan Document or any amendment hereto or thereto, shall at any time prove to
have been incorrect or misleading in any material respect when made or deemed
made.

         (d) Default in Performance of Certain Covenants. Any Borrower shall
default in the performance or observance of any covenant or agreement contained
in Sections 6.1 or 6.2 or Articles VIII or IX of this Agreement.

         (e) Default in Performance of Other Covenants and Conditions. Any
Borrower or any Subsidiary thereof shall default in the performance or
observance of any term, covenant, condition or agreement contained in this
Agreement (other than as specifically provided for otherwise in this Section
10.1) or any other Loan Document and such default shall continue for a period of
thirty (30) days after written notice thereof has been given to the Borrowers by
the Administrative Agent in the amount provided herein.

         (f) Debt Cross-Default. Any Borrower or any of its Subsidiaries shall
(i) default in the payment of the Working Capital Facility beyond the period of
grace, if any, provided in the instrument or agreement under which the Working
Capital Facility was created, (ii) default in the payment of any Debt payable to
any Lender, other than the Obligations, beyond the period of grace, if any,
provided in the instrument or agreement under which such Debt was created, (iii)
default in the payment of any Debt (other than the Notes) the aggregate
outstanding amount of which Debt is in excess of $1,000,000 beyond the period of
grace if any, provided in the instrument or agreement under which such Debt was
created, or (iv) default in the observance or performance of any other agreement
or condition relating to any Debt (other than the Notes and other than the Debt
referred to in clauses (i), (ii) or (iii) above the aggregate outstanding amount
of which other Debt is in excess of $1,000,000 or contained in any instrument or
agreement evidencing, securing or relating thereto or any other event shall
occur or condition exist, the effect of which default or other event or
condition is to cause, or to permit the holder or holders of such other Debt (or
a trustee or agent on behalf of such holder or holders) to cause, with the
giving of notice if required, any such other Debt to become due prior to its
stated maturity (any applicable grace period having expired).

         (g) Other Cross-Defaults. Any Borrower or any of its Subsidiaries shall
default in the payment when due, or in the performance or observance, of any
obligation or condition of any Material Contract unless, but only as long as,
the existence of any such default is being contested by such Borrower or such
Subsidiary in good faith by appropriate proceedings and adequate reserves in
respect thereof have been established on the books of such Borrower or such
Subsidiary to the extent required by GAAP.

         (h) Change in Control. Any person or group of persons (within the
meaning of Section 13(d) of the Securities Exchange Act of 1934, as amended)
other than Inberdon Enterprises, Ltd., shall obtain ownership or control in one
or more series of transactions of more than twenty-five percent (25%) of the
common stock or twenty-five percent (25%) of the voting power of U.S. Lime
entitled to vote in the election of members of the board of directors of U.S.
Lime or there shall have occurred under any indenture or other instrument
evidencing any Debt in excess of $1,000,000 any



                                      (45)
<PAGE>   50

"change in control" (as defined in such indenture or other evidence of Debt)
obligating the Borrower to repurchase, redeem or repay all or any part of the
Debt or capital stock provided for therein (any such event, a "Change in
Control").

         (i) Voluntary Bankruptcy Proceeding. Any Borrower or any Subsidiary
thereof shall (i) commence a voluntary case under the federal bankruptcy laws
(as now or hereafter in effect), (ii) file a petition seeking to take advantage
of any other laws, domestic or foreign, relating to bankruptcy, insolvency,
reorganization, winding up or composition for adjustment of debts, (iii) consent
to or fail to contest in a timely and appropriate manner any petition filed
against it in an involuntary case under such bankruptcy laws or other laws, (iv)
apply for or consent to, or fail to contest in a timely and appropriate manner,
the appointment of, or the taking of possession by, a receiver, custodian,
trustee, or liquidator of itself or of a substantial part of its property,
domestic or foreign, (v) admit in writing its inability to pay its debts as they
become due, (vi) make a general assignment for the benefit of creditors, or
(vii) take any corporate action for the purpose of authorizing any of the
foregoing.

         (j) Involuntary Bankruptcy Proceeding. A case or other proceeding shall
be commenced against any Borrower or any Subsidiary thereof in any court of
competent jurisdiction seeking (i) relief under the federal bankruptcy laws (as
now or hereafter in effect) or under any other laws, domestic or foreign,
relating to bankruptcy, insolvency, reorganization, winding up or adjustment of
debts, or (ii) the appointment of a trustee, receiver, custodian, liquidator or
the like for such Borrower or any Subsidiary thereof or for all or any
substantial part of their respective assets, domestic or foreign, and such case
or proceeding shall continue without dismissal or stay for a period of sixty
(60) consecutive days, or an order granting the relief requested in such case or
proceeding (including, but not limited to, an order for relief under such
federal bankruptcy laws) shall be entered.

         (k) Failure of Agreements. Any provision of this Agreement or of any
other Loan Document shall for any reason cease to be valid and binding on any
Borrower or Subsidiary party thereto or any such Person shall so state in
writing, or this Agreement or any other Loan Document shall for any reason cease
to create a valid and perfected first priority Lien on, or security interest in,
any of the collateral purported to be covered thereby, in each case other than
in accordance with the express terms hereof or thereof.

         (l) Termination Event. The occurrence of any of the following events:
(i) the Borrower or any ERISA Affiliate fails to make full payment when due of
all amounts in excess of $100,000 which, under the provisions of any Pension
Plan or Section 412 of the Code, any Borrower or any ERISA Affiliate is required
to pay as contributions thereto, (ii) an accumulated funding deficiency in
excess of $100,000 occurs or exists, whether or not waived, with respect to any
Pension Plan, (iii) a Termination Event or (iv) any Borrower or any ERISA
Affiliate as employer under one or more Multiemployer Plan makes a complete or
partial withdrawal from any such Multiemployer Plan and the plan sponsor of such
Multiemployer Plans notifies such withdrawing employer that such employer has
incurred a withdrawal liability requiring payments in an amount exceeding
$100,000.



                                      (46)
<PAGE>   51

         (m) Judgment. A judgment or order for the payment of money which causes
the aggregate amount of all such judgments to exceed $1,000,000 in any Fiscal
Year shall be entered against any Borrower or any of its Subsidiaries by any
court and such judgment or order shall continue without discharge or stay for a
period of thirty (30) days.

         SECTION 10.2. Remedies.

         Upon the occurrence of an Event of Default which shall be continuing,
with the consent of the Required Lenders, the Administrative Agent may, or upon
the request of the Required Lenders, the Administrative Agent shall, by notice
to the Borrowers:

         (a) Acceleration; Termination of Facilities. Declare the principal of
and interest on the Loans and the Notes at the time outstanding, and all other
amounts owed to the Lenders and to the Administrative Agent under this Agreement
or any of the other Loan Documents and all other Obligations, to be forthwith
due and payable, whereupon the same shall immediately become due and payable
without presentment, demand, protest or other notice of any kind, all of which
are expressly waived, anything in this Agreement or the other Loan Documents to
the contrary notwithstanding, and terminate the Loan Facility and any right of
the Borrowers to receive Loans thereunder; provided, that upon the occurrence of
an Event of Default specified in Section 10.1(i) or (j), the Credit Facility
shall be automatically terminated and all Obligations shall automatically become
due and payable.

         (b) Rights of Collection. Exercise on behalf of the Lenders all of its
other rights and remedies under this Agreement, the other Loan Documents and
Applicable Law, in order to satisfy all of the Borrower's Obligations.

         SECTION 10.3 Rights and Remedies Cumulative; Non-Waiver; etc.

         The enumeration of the rights and remedies of the Administrative Agent
and the Lenders set forth in this Agreement is not intended to be exhaustive and
the exercise by the Administrative Agent and the Lenders of any right or remedy
shall not preclude the exercise of any other rights or remedies, all of which
shall be cumulative, and shall be in addition to any other right or remedy given
hereunder or under the Loan Documents or that may now or hereafter exist in law
or in equity or by suit or otherwise. No delay or failure to take action on the
part of the Administrative Agent or any Lender in exercising any right, power or
privilege shall operate as a waiver thereof, nor shall any single or partial
exercise of any such right, power or privilege preclude other or further
exercise thereof or the exercise of any other right, power or privilege or shall
be construed to be a waiver of any Event of Default. No course of dealing
between any Borrower, the Administrative Agent and the Lenders or their
respective agents or employees shall be effective to change, modify or discharge
any provision of this Agreement or any of the other Loan Documents or to
constitute a waiver of any Event of Default.



                                      (47)
<PAGE>   52

                                   ARTICLE XI

                            THE ADMINISTRATIVE AGENT

         SECTION 11.1 Appointment.

         Each of the Lenders hereby irrevocably designates and appoints First
Union as Administrative Agent of such Lender under this Agreement and the other
Loan Documents for the term hereof and each such Lender irrevocably authorizes
First Union as Administrative Agent for such Lender, to take such action on its
behalf under the provisions of this Agreement and the other Loan Documents and
to exercise such powers and perform such duties as are expressly delegated to
the Administrative Agent by the terms of this Agreement and such other Loan
Documents, together with such other powers as are reasonably incidental thereto.
Notwithstanding any provision to the contrary elsewhere in this Agreement or
such other Loan Documents, the Administrative Agent shall not have any duties or
responsibilities, except those expressly set forth herein and therein, or any
fiduciary relationship with any Lender, and no implied covenants, functions,
responsibilities, duties, obligations or liabilities shall be read into this
Agreement or the other Loan Documents or otherwise exist against the
Administrative Agent. Any reference to the Administrative Agent in this Article
XI shall be deemed to refer to the Administrative Agent solely in its capacity
as Administrative Agent and not in its capacity as a Lender.

         SECTION 11.2 Delegation of Duties.

         The Administrative Agent may execute any of its respective duties under
this Agreement and the other Loan Documents by or through agents or
attorneys-in-fact and shall be entitled to advice of counsel concerning all
matters pertaining to such duties. The Administrative Agent shall not be
responsible for the negligence or misconduct of any agents or attorneys-in-fact
selected by the Administrative Agent with reasonable care.

         SECTION 11.3 Exculpatory Provisions.

         Neither the Administrative Agent nor any of its officers, directors,
employees, agents, attorneys-in-fact, Subsidiaries or Affiliates shall be (a)
liable for any action lawfully taken or omitted to be taken by it or such Person
under or in connection with this Agreement or the other Loan Documents (except
for actions occasioned solely by its or such Person's own gross negligence or
willful misconduct), or (b) responsible in any manner to any of the Lenders for
any recitals, statements, representations or warranties made by any Borrower or
any of its Subsidiaries or any officer thereof contained in this Agreement or
the other Loan Documents or in any certificate, report, statement or other
document referred to or provided for in, or received by the Administrative Agent
under or in connection with, this Agreement or the other Loan Documents or for
the value, validity, effectiveness, genuineness, enforceability or sufficiency
of this Agreement or the other Loan Documents or for any failure of any Borrower
or any of its Subsidiaries to perform its obligations hereunder or thereunder.
The Administrative Agent shall not be under any obligation to any Lender to
ascertain or to inquire as to the observance or performance of any of the



                                      (48)
<PAGE>   53

agreements contained in, or conditions of, this Agreement, or to inspect the
properties, books or records of the Borrower or any of its Subsidiaries.

         SECTION 11.4 Reliance by the Administrative Agent.

         The Administrative Agent shall be entitled to rely, and shall be fully
protected in relying, upon any note, writing, resolution, notice, consent,
certificate, affidavit, letter, cablegram, telegram, telecopy, telex or teletype
message, statement, order or other document or conversation believed by it to be
genuine and correct and to have been signed, sent or made by the proper Person
or Persons and upon advice and statements of legal counsel (including, without
limitation, counsel to the Borrowers), independent accountants and other experts
selected by the Administrative Agent with care. The Administrative Agent may
deem and treat the payee of any Note as the owner thereof for all purposes
unless such Note shall have been transferred in accordance with Section 12.10
hereof. The Administrative Agent shall be fully justified in failing or refusing
to take any action under this Agreement and the other Loan Documents unless it
shall first receive such advice or concurrence of the Required Lenders (or, when
expressly required hereby or by the relevant other Loan Document, all the
Lenders) as it deems appropriate or it shall first be indemnified to its
satisfaction by the Lenders against any and all liability and expense which may
be incurred by it by reason of taking or continuing to take any such action
except for its own gross negligence or willful misconduct. The Administrative
Agent shall in all cases be fully protected in acting, or in refraining from
acting, under this Agreement and the Notes in accordance with a request of the
Required Lenders (or, when expressly required hereby, all the Lenders), and such
request and any action taken or failure to act pursuant thereto shall be binding
upon all the Lenders and all future holders of the Notes.

         SECTION 11.5 Notice of Default.

         The Administrative Agent shall not be deemed to have knowledge or
notice of the occurrence of any Default or Event of Default hereunder unless it
has received notice from a Lender or any Borrower referring to this Agreement,
describing such Default or Event of Default and stating that such notice is a
"notice of default". In the event that the Administrative Agent receives such a
notice, it shall promptly give notice thereof to the Lenders. The Administrative
Agent shall take such action with respect to such Default or Event of Default as
shall be reasonably directed by the Required Lenders; provided that unless and
until the Administrative Agent shall have received such directions, the
Administrative Agent may (but shall not be obligated to) take such action, or
refrain from taking such action, with respect to such Default or Event of
Default as it shall deem advisable in the best interests of the Lenders, except
to the extent that other provisions of this Agreement expressly require that any
such action be taken or not be taken only with the consent and authorization or
the request of the Lenders or Required Lenders, as applicable.

         SECTION 11.6 Non-Reliance on the Administrative Agent and Other
Lenders.

         Each Lender expressly acknowledges that neither the Administrative
Agent nor any of its respective officers, directors, employees, agents,
attorneys-in-fact, Subsidiaries or Affiliates has made any representations or
warranties to it and that no act by the Administrative Agent hereinafter taken,
including any review of the affairs of the Borrowers or any of their
Subsidiaries, shall be



                                      (49)
<PAGE>   54

deemed to constitute any representation or warranty by the Administrative Agent
to any Lender. Each Lender represents to the Administrative Agent that it has,
independently and without reliance upon the Administrative Agent or any other
Lender, and based on such documents and information as it has deemed
appropriate, made its own appraisal of and investigation into the business,
operations, property, financial and other condition and creditworthiness of the
Borrowers and their Subsidiaries and made its own decision to make its Loans and
enter into this Agreement. Each Lender also represents that it will,
independently and without reliance upon the Administrative Agent or any other
Lender, and based on such documents and information as it shall deem appropriate
at the time, continue to make its own credit analysis, appraisals and decisions
in taking or not taking action under this Agreement and the other Loan
Documents, and to make such investigation as it deems necessary to inform itself
as to the business, operations, property, financial and other condition and
creditworthiness of the Borrowers and their Subsidiaries. Except for notices,
reports and other documents expressly required to be furnished to the Lenders by
the Administrative Agent hereunder or by the other Loan Documents, the
Administrative Agent shall not have any duty or responsibility to provide any
Lender with any credit or other information concerning the business, operations,
property, financial and other condition or creditworthiness of the Borrowers or
any of their Subsidiaries which may come into the possession of the
Administrative Agent or any of its respective officers, directors, employees,
agents, attorneys-in-fact, Subsidiaries or Affiliates.

         SECTION 11.7 Indemnification.

         The Lenders agree to indemnify the Administrative Agent in its capacity
as such and (to the extent not reimbursed by the Borrowers and without limiting
the obligation of the Borrowers to do so), ratably according to the respective
amounts of their Pro Rata Shares, from and against any and all liabilities,
obligations, losses, damages, penalties, actions, judgments, suits, costs,
expenses or disbursements of any kind whatsoever which may at any time
(including, without limitation, at any time following the payment of the Notes)
be imposed on, incurred by or asserted against the Administrative Agent in any
way relating to or arising out of this Agreement or the other Loan Documents, or
any documents contemplated by or referred to herein or therein or the
transactions contemplated hereby or thereby or any action taken or omitted by
the Administrative Agent under or in connection with any of the foregoing;
provided that no Lender shall be liable for the payment of any portion of such
liabilities, obligations, losses, damages, penalties, actions, judgments, suits,
costs, expenses or disbursements resulting solely from the Administrative
Agent's bad faith, gross negligence or willful misconduct. The agreements in
this Section 11.7 shall survive the payment of the Notes and all other amounts
payable hereunder and the termination of this Agreement.

         SECTION 11.8 The Administrative Agent in Its Individual Capacity.

         The Administrative Agent and its respective Subsidiaries and Affiliates
may make loans to, accept deposits from and generally engage in any kind of
business with any of the Borrowers as though the Administrative Agent were not
an Administrative Agent hereunder. With respect to any Loans made or renewed by
it and any Note issued to it, the Administrative Agent shall have the same
rights and powers under this Agreement and the other Loan Documents as any
Lender and


                                      (50)
<PAGE>   55

may exercise the same as though it were not an Administrative Agent, and the
terms "Lender" and "Lenders" shall include the Administrative Agent in its
individual capacity.

         SECTION 11.9 Resignation of the Administrative Agent; Successor
Administrative Agent.

         Subject to the appointment and acceptance of a successor as provided
below, the Administrative Agent may resign at any time by giving notice thereof
to the Lenders and the Borrowers. Upon any such resignation, the Required
Lenders shall have the right to appoint a successor Administrative Agent, which
successor shall have minimum capital and surplus of at least $500,000,000. If no
successor Administrative Agent shall have been so appointed by the Required
Lenders and shall have accepted such appointment within thirty (30) days after
the Administrative Agent's giving of notice of resignation, then the
Administrative Agent may, on behalf of the Lenders, appoint a successor
Administrative Agent, which successor shall have minimum capital and surplus of
at least $500,000,000. Upon the acceptance of any appointment as Administrative
Agent hereunder by a successor Administrative Agent, such successor
Administrative Agent shall thereupon succeed to and become vested with all
rights, powers, privileges and duties of the retiring Administrative Agent, and
the retiring Administrative Agent shall be discharged from its duties and
obligations hereunder. After any retiring Administrative Agent's resignation
hereunder as Administrative Agent, the provisions of this Section 11.9 shall
continue in effect for its benefit in respect of any actions taken or omitted to
be taken by it while it was acting as Administrative Agent.

                                   ARTICLE XII

                                  MISCELLANEOUS

         SECTION 12.1 Notices.

         (a) Method of Communication. Except as otherwise provided in this
Agreement, all notices and communications hereunder shall be in writing, or by
telephone subsequently confirmed in writing. Any notice shall be effective if
delivered by hand delivery or sent via telecopy, recognized overnight courier
service or certified mail, return receipt requested, and shall be presumed to be
received by a party hereto (i) on the date of receipt if delivered by hand or
sent by telecopy, (ii) on the next Business Day if sent by recognized overnight
courier service and (iii) on the third Business Day following the date sent by
certified mail, return receipt requested. A telephonic notice to the
Administrative Agent as understood by the Administrative Agent will be deemed to
be the controlling and proper notice in the event of a discrepancy with or
failure to receive a confirming written notice.

         (b) Addresses for Notices. Notices to any party shall be sent to it at
the following address or addresses, or any other address as to which all the
other parties are hereafter notified in writing.


                                      (51)
<PAGE>   56

      If to the Borrowers:       United States Lime & Minerals, Inc.
                                 12221 Merit Drive, Suite 500
                                 Dallas, Texas  75251
                                 Attention:  Herbert G.A. Wilson, C.E.O.
                                 Telephone No.:  (972) 991-8400
                                 Telecopy No.:  (972) 385-1304

      With copies to:            Morgan Lewis & Bockius LLP
                                 1701 Market Street
                                 Philadelphia, PA  19103
                                 Attention:  James A. Hunter, Jr., Esq.
                                 Telephone No.:  (215) 963-5381
                                 Telecopy No.:  (215) 963-5299

      If to First Union as       First Union National Bank
       Administrative Agent:     One First Union Center, TW-10
                                 301 South College Street
                                 Charlotte, North Carolina 28288-0608
                                 Attention:  Syndication Agency Services
                                 Telephone No.:  (704) 374-2698
                                 Telecopy No.:  (704) 383-0288

      With copies to:            First Union National Bank
                                 1339 Chestnut Street
                                 The Widener Building, 11th Floor
                                 Philadelphia, PA  19107
                                 Attention:  Clifford W. Kewley, Vice President
                                 Telephone No.:  (215) 973-3913
                                 Telecopy No.:  (215) 786-7704

                                          and

                                 Mesirov Gelman Jaffe Cramer & Jamieson, LLP
                                 1735 Market Street, 38th Floor
                                 Philadelphia, PA  19103
                                 Attention:  Jeffrey O. Greenfield, Esq.
                                 Telephone No.:  (215) 994-1278
                                 Telecopy No.: (215) 994-1111

      If to any Lender:          To the Address set forth on Schedule 1 hereto

         (c) Administrative Agent's Office. The Administrative Agent hereby
designates its office located at the address set forth above, or any subsequent
office which shall have been specified for such purpose by written notice to the
Borrowers and Lenders, as the Administrative Agent's Office referred to herein,
to which payments due are to be made and at which Loans will be disbursed.



                                      (52)
<PAGE>   57

         SECTION 12.2 Expenses; Indemnity.

         The Borrowers will (a) pay all out-of-pocket expenses of the
Administrative Agent in connection with (i) the preparation, execution and
delivery of this Agreement and each other Loan Document, whenever the same shall
be executed and delivered, including without limitation all out-of-pocket
syndication and due diligence expenses and reasonable fees and disbursements of
counsel for the Administrative Agent and (ii) the preparation, execution and
delivery of any waiver, amendment or consent by the Administrative Agent or the
Lenders relating to this Agreement or any other Loan Document, including without
limitation reasonable fees and disbursements of counsel for the Administrative
Agent, (b) pay all reasonable out-of-pocket expenses of the Administrative Agent
and each Lender actually incurred in connection with the administration (other
than routine day to day administration) and enforcement of any rights and
remedies of the Administrative Agent and Lenders under the Credit Facility,
including consulting with appraisers, accountants, engineers, attorneys and
other Persons concerning the nature, scope or value of any right or remedy of
the Administrative Agent or any Lender hereunder or under any other Loan
Document or any factual matters in connection therewith, which expenses shall
include without limitation the reasonable fees and disbursements of such
Persons, and (c) defend, indemnify and hold harmless the Administrative Agent
and the Lenders, and their respective parents, Subsidiaries, Affiliates,
employees, agents, officers and directors, from and against any losses,
penalties, fines, liabilities, settlements, damages, costs and expenses suffered
by any such Person in connection with any claim, investigation, litigation or
other proceeding (whether or not the Administrative Agent or any Lender is a
party thereto) and the prosecution and defense thereof, arising out of or in any
way connected with this Agreement, any other Loan Document or the Loans,
including without limitation reasonable attorney's and consultant's fees, except
to the extent that any of the foregoing result from the gross negligence or
willful misconduct of the party seeking indemnification therefor.

         SECTION 12.3 Set-off.

         In addition to any rights now or hereafter granted under Applicable Law
and not by way of limitation of any such rights, upon and after the occurrence
of any Event of Default and during the continuation thereof, the Lenders and any
assignee or participant of a Lender in accordance with Section 12.10 are hereby
authorized by the Borrowers at any time or from time to time, without notice to
the Borrowers or to any other Person, any such notice being hereby expressly
waived, to set off and to appropriate and to apply any and all deposits (general
or special, time or demand, including, but not limited to, indebtedness
evidenced by certificates of deposit, whether matured or unmatured) and any
other indebtedness at any time held or owing by the Lenders, or any such
assignee or participant to or for the credit or the account of the Borrowers
against and on account of the Obligations irrespective of whether or not (a) the
Lenders shall have made any demand under this Agreement or any of the other Loan
Documents or (b) the Administrative Agent shall have declared any or all of the
Obligations to be due and payable as permitted by Section 10.2 and although such
Obligations shall be contingent or unmatured.




                                      (53)
<PAGE>   58

         SECTION 12.4 Governing Law.

         This Agreement, the Notes and the other Loan Documents, unless
otherwise expressly set forth therein, shall be governed by, construed and
enforced in accordance with the laws of the Commonwealth of Pennsylvania,
without reference to the conflicts or choice of law principles thereof.

         SECTION 12.5 Consent to Jurisdiction.

         Each party hereby irrevocably consents to the personal jurisdiction of
the state and federal courts located in Philadelphia County, Pennsylvania, in
any action, claim or other proceeding arising out of any dispute in connection
with this Agreement, the Notes and the other Loan Documents, any rights or
obligations hereunder or thereunder, or the performance of such rights and
obligations. Each party hereby irrevocably consents to the service of a summons
and complaint and other process in any action, claim or proceeding brought by
the Administrative Agent or any Lender in connection with this Agreement, the
Notes or the other Loan Documents, any rights or obligations hereunder or
thereunder, or the performance of such rights and obligations, on behalf of
itself or its property, in the manner (other than by telecopier) specified in
Section 12.1. Nothing in this Section 12.5 shall affect the right of any party
to serve legal process in any other manner permitted by Applicable Law or affect
the right of any party to bring any action or proceeding against any other party
or parties or its or their or its properties in the courts of any other
jurisdictions.

         SECTION 12.6 Binding Arbitration; Waiver of Jury Trial.

         (a) Binding Arbitration. Upon demand of any party, whether made before
or after institution of any judicial proceeding, any dispute, claim or
controversy arising out of, connected with or relating to the Notes or any other
Loan Documents ("Disputes") between or among parties to the Notes or any other
Loan Document shall be resolved by binding arbitration as provided herein.
Institution of a judicial proceeding by a party does not waive the right of that
party to demand arbitration hereunder. Disputes may include, without limitation,
tort claims, counterclaims, claims brought as class actions, claims arising from
Loan Documents executed in the future, disputes as to whether a matter is
subject to arbitration, or claims concerning any aspect of the past, present or
future relationships arising out of or connected with the Loan Documents.
Arbitration shall be conducted under and governed by the Commercial Financial
Disputes Arbitration Rules (the "Arbitration Rules") of the American Arbitration
Association and Title 9 of the U.S. Code. All arbitration hearings shall be
conducted in Philadelphia, Pennsylvania. The expedited procedures set forth in
Rule 51, et seq. of the Arbitration Rules shall be applicable to claims of less
than $1,000,000. All applicable statutes of limitation shall apply to any
Dispute. A judgment upon the award may be entered in any court having
jurisdiction. Notwithstanding anything foregoing to the contrary, any
arbitration proceeding demanded hereunder shall begin within ninety (90) days
after such demand thereof and shall be concluded within one-hundred and twenty
(120) days after such demand. These time limitations may not be extended unless
a party hereto shows cause for extension and then such extension shall not
exceed a total of sixty (60) days. The panel from which all arbitrators are
selected shall be comprised of licensed attorneys. The single arbitrator
selected for expedited procedure shall be a retired judge from the highest court
of



                                      (54)
<PAGE>   59

general jurisdiction, state or federal, of the state where the hearing will be
conducted. The parties hereto do not waive any applicable Federal or state
substantive law except as provided herein.

         (b) Jury Trial. THE ADMINISTRATIVE AGENT, EACH LENDER AND EACH OF THE
BORROWERS HEREBY ACKNOWLEDGE THAT BY AGREEING TO BINDING ARBITRATION THEY HAVE
IRREVOCABLY WAIVED THEIR RESPECTIVE RIGHTS TO A JURY TRIAL WITH RESPECT TO ANY
ACTION, CLAIM OR OTHER PROCEEDING ARISING OUT OF ANY DISPUTE IN CONNECTION WITH
THIS AGREEMENT, THE NOTES OR THE OTHER LOAN DOCUMENTS, ANY RIGHTS OR OBLIGATIONS
HEREUNDER OR THEREUNDER, OR THE PERFORMANCE OF SUCH RIGHTS AND OBLIGATIONS.

         (c) Preservation of Certain Remedies. Notwithstanding the preceding
binding arbitration provisions, the parties hereto and the other Loan Documents
preserve, without diminution, certain remedies that such Persons may employ or
exercise freely, either alone, in conjunction with or during a Dispute. Each
such Person shall have and hereby reserves the right to proceed in any court of
proper jurisdiction or by self help to exercise or prosecute the following
remedies: (i) all rights to foreclose against any real or personal property or
other security by exercising a power of sale granted in the Loan Documents or
under applicable law or by judicial foreclosure and sale, (ii) all rights of
self help including peaceful occupation of property and collection of rents, set
off, and peaceful possession of property, (iii) obtaining provisional or
ancillary remedies including injunctive relief, sequestration, garnishment,
attachment, appointment of receiver and in filing an involuntary bankruptcy
proceeding, and (iv) when applicable, a judgment by confession of judgment.
Preservation of these remedies does not limit the power of an arbitrator to
grant similar remedies that may be requested by a party in a Dispute.

         SECTION 12.7 Reversal of Payments.

         To the extent the Borrowers make a payment or payments to the
Administrative Agent for the ratable benefit of the Lenders or the
Administrative Agent receives any payment or proceeds of the collateral which
payments or proceeds or any part thereof are subsequently invalidated, declared
to be fraudulent or preferential, set aside and/or required to be repaid to a
trustee, receiver or any other party under any bankruptcy law, state or federal
law, common law or equitable cause, then, to the extent of such payment or
proceeds repaid, the Obligations or part thereof intended to be satisfied shall
be revived and continued in full force and effect as if such payment or proceeds
had not been received by the Administrative Agent.

         SECTION 12.8 Injunctive Relief; Punitive Damages.

         (a) Each Borrower recognizes that, in the event a Borrower fails to
perform, observe or discharge any of its obligations or liabilities under this
Agreement, any remedy of law may prove to be inadequate relief to the Lenders.
Therefore, the Borrowers agree that the Lenders, at the Lenders' option, shall
be entitled to temporary and permanent injunctive relief in any such case
without the necessity of proving actual damages.



                                      (55)
<PAGE>   60

         (b) The Administrative Agent, Lenders and Borrowers (on behalf of
themselves and their Subsidiaries) hereby agree that no such Person shall have a
remedy of punitive or exemplary damages against any other party to a Loan
Document and each such Person hereby waives any right or claim to punitive or
exemplary damages that they may now have or may arise in the future in
connection with any Dispute, whether such Dispute is resolved through
arbitration or judicially.

         (c) The parties agree that they shall not have a remedy of punitive or
exemplary damages against any other party in any Dispute and hereby waive any
right or claim to punitive or exemplary damages they have now or which may arise
in the future in connection with any Dispute whether the Dispute is resolved by
arbitration or judicially.

         SECTION 12.9 Accounting Matters.

         All financial and accounting calculations, measurements and
computations made for any purpose relating to this Agreement, including, without
limitation, all computations utilized by any Borrower or any Subsidiary thereof
to determine compliance with any covenant contained herein, shall, except as
otherwise expressly contemplated hereby or unless there is an express written
direction by the Administrative Agent to the contrary agreed to by any Borrower,
be performed in accordance with GAAP as in effect on the Closing Date. In the
event that changes in GAAP shall be mandated by the Financial Accounting
Standards Board, or any similar accounting body of comparable standing, or shall
be recommended by the Borrowers' certified public accountants, to the extent
that such changes would modify such accounting terms or the interpretation or
computation thereof, such changes shall be followed in defining such accounting
terms only from and after the date the Borrower and the Lenders shall have
amended this Agreement to the extent necessary to reflect any such changes in
the financial covenants and other terms and conditions of this Agreement.

         SECTION 12.10 Successors and Assigns; Participations.

         (a) Benefit of Agreement. This Agreement shall be binding upon and
inure to the benefit of the Borrowers, the Administrative Agent and the Lenders,
all future holders of the Notes, and their respective successors and assigns,
except that none of Borrowers shall assign or transfer any of their rights or
obligations under this Agreement without the prior written consent of each
Lender.

         (b) Assignment by Lenders. Each Lender may, with the consent of the
Administrative Agent, which consents shall not be unreasonably withheld, assign
to one or more Eligible Assignees all or a portion of its interests, rights and
obligations under this Agreement (including, without limitation, all or a
portion of the Extensions of Credit at the time owing to it and the Notes held
by it); provided that:

                  (i) each such assignment shall be of a constant, and not a
varying, percentage of all the assigning Lender's rights and obligations under
this Agreement;



                                      (56)
<PAGE>   61

                  (ii) if less than all of the assigning Lender's Pro Rata Share
is to be assigned, the Pro Rata Share so assigned shall not be less than
$2,000,000;

                  (iii) the parties to each such assignment shall execute and
deliver to the Administrative Agent, for its acceptance and recording in the
Register, an Assignment and Acceptance in the form of Exhibit F attached hereto
(an "Assignment and Acceptance"), together with any Note or Notes subject to
such assignment, duly endorsed;

                  (iv) such assignment shall not, without the consent of the
Borrowers, require the Borrowers to file a registration statement with the
Securities and Exchange Commission or apply to or qualify the Loans or the Notes
under the blue sky laws of any state; and

                  (v) the assigning Lender shall pay to the Administrative Agent
an assignment fee of $3,000 upon the execution by such Lender of the Assignment
and Acceptance; provided that no such fee shall be payable upon any assignment
by a Lender to an Affiliate thereof.

Upon such execution, delivery, acceptance and recording, from and after the
effective date specified in each Assignment and Acceptance, which effective date
shall be at least five (5) Business Days after the execution thereof, (A) the
assignee thereunder shall be a party hereto and, to the extent provided in such
Assignment and Acceptance, have the rights and obligations of a Lender hereby
and (B) the Lender thereunder shall, to the extent provided in such assignment,
be released from its obligations under this Agreement.

         (c) Rights and Duties Upon Assignment. By executing and delivering an
Assignment and Acceptance, the assigning Lender thereunder and the assignee
thereunder confirm to and agree with each other and the other parties hereto as
set forth in such Assignment and Acceptance.

         (d) Register. The Administrative Agent shall maintain a copy of each
Assignment and Acceptance delivered to it and a register for the recordation of
the names and addresses of the Lenders and the amount of the Extensions of
Credit with respect to each Lender from time to time (the "Register"). The
entries in the Register shall be conclusive, in the absence of manifest error,
and the Borrowers, the Administrative Agent and the Lenders may treat each
person whose name is recorded in the Register as a Lender hereunder for all
purposes of this Agreement. The Register shall be available for inspection by
any Borrower or Lender at any reasonable time and from time to time upon
reasonable prior notice.

         (e) Issuance of New Notes. Upon its receipt of an Assignment and
Acceptance executed by an assigning Lender and an Eligible Assignee together
with any Note or Notes subject to such assignment and the written consent to
such assignment, the Administrative Agent shall, if such Assignment and
Acceptance has been completed and is substantially in the form of Exhibit F:

                  (i)   accept such Assignment and Acceptance;

                  (ii)  record the information contained therein in the
Register;

                  (iii) give prompt notice thereof to the Lenders and the
Borrowers; and



                                      (57)
<PAGE>   62

                  (iv) promptly deliver a copy of such Assignment and Acceptance
to the Borrowers.

Within five (5) Business Days after receipt of notice, the Borrowers shall
execute and deliver to the Administrative Agent, in exchange for the surrendered
Note or Notes, a new Note or Notes to the order of such Eligible Assignee in
amounts equal to the Pro Rata Share assumed by it pursuant to such Assignment
and Acceptance and a new Note or Notes to the order of the assigning Lender in
an amount equal to the Pro Rata Share, if any, retained by it hereunder. Such
new Note or Notes shall be in an aggregate principal amount equal to the
aggregate principal amount of such surrendered Note or Notes, shall be dated the
effective date of such Assignment and Acceptance and shall otherwise be in
substantially the form of the assigned Notes delivered to the assigning Lender.
Each surrendered Note or Notes shall be canceled and returned to the Borrowers.

         (f) Participations. Each Lender may sell participations to one or more
banks or other entities who would qualify as an Eligible Assignee in all or a
portion of its rights and obligations under this Agreement (including, without
limitation, all or a portion of its Extensions of Credit and the Notes held by
it); provided that:

                  (i) each such participation shall be in an amount not less
than $10,000,000;

                  (ii) such Lender's obligations under this Agreement
(including, without limitation, its Pro Rata Share) shall remain unchanged;

                  (iii) such Lender shall remain solely responsible to the other
parties hereto for the performance of such obligations;

                  (iv) such Lender shall remain the holder of the Notes held by
it for all purposes of this Agreement;

                  (v) the Borrowers, the Administrative Agent and the other
Lenders shall continue to deal solely and directly with such Lender in
connection with such Lender's rights and obligations under this Agreement;

                  (vi) such Lender shall not permit such participant the right
to approve any waivers, amendments or other modifications to this Agreement or
any other Loan Document other than waivers, amendments or modifications which
would reduce the principal of or the interest rate on any Loan, extend the final
maturity, or reduce the amount of any fees to which such participant is
entitled, extend in a manner affecting such participant any scheduled payment
date for principal of any Loan or, except as expressly contemplated hereby or
thereby, release substantially all of the Collateral; and

                  (vii) any such disposition shall not, without the consent of
the Borrowers, require the Borrowers to file a registration statement with the
Securities and Exchange Commission to apply to qualify the Loans or the Notes
under the blue sky law of any state.




                                      (58)
<PAGE>   63

         (g) Disclosure of Information; Confidentiality. The Administrative
Agent and the Lenders shall hold all non-public information with respect to the
Borrowers obtained pursuant to the Loan Documents in accordance with customary
procedures for handling confidential information; provided, that the
Administrative Agent may disclose information relating to this Agreement to Gold
Sheets and other similar bank trade publications, such information to consist of
deal terms and other information customarily found in such publications and
provided further, that the Administrative Agent and Lenders may disclose any
such information to the extent such disclosure is required by law or requested
by any regulatory authority. Any Lender may, in connection with any assignment,
proposed assignment, participation or proposed participation pursuant to this
Section 12.10, disclose to the assignee, participant, proposed assignee or
proposed participant (in each case to the extent it qualifies as an Eligible
Assignee), any information relating to the Borrowers furnished to such Lender by
or on behalf of the Borrowers; provided, that prior to any such disclosure, each
such assignee, proposed assignee, participant or proposed participant shall
agree with the Borrowers or such Lender to preserve the confidentiality of any
confidential information relating to the Borrowers received from such Lender.

         (h) Certain Pledges or Assignments. Nothing herein shall prohibit any
Lender from pledging or assigning any Note to any Federal Reserve Bank in
accordance with Applicable Law.

         SECTION 12.11 Amendments, Waivers and Consents.

         Except as set forth below, any term, covenant, agreement or condition
of this Agreement or any of the other Loan Documents may be amended or waived by
the Lenders, and any consent given by the Lenders, if, but only if, such
amendment, waiver or consent is in writing signed by the Borrowers (in the case
of an amendment) and the Required Lenders (or by the Administrative Agent with
the consent of the Required Lenders) and delivered to the Administrative Agent;
provided, that no amendment, waiver or consent shall (a) increase the amount or
extend the time of the obligation of the Lenders to make Loans, (b) extend the
originally scheduled time or times of payment of the principal of any Loan or
the time or times of payment of interest on any Loan, (c) reduce the rate of
interest or fees payable on any Loan, (d) reduce the principal amount of any
Loan, (e) permit any subordination of the principal or interest on any Loan, (f)
permit any assignment (other than as permitted or contemplated in this
Agreement) of any of any Borrower's rights and obligations hereunder, (g)
release any material portion of the Collateral or release any Security Document
(other than as specifically permitted or contemplated in this Agreement or the
applicable Security Document) or (h) amend the provisions of this Section 12.11
or the definition of Required Lenders, without the prior written consent of each
Lender. In addition, no amendment, waiver or consent to the provisions of
Article XI shall be made without the written consent of the Administrative
Agent. Any agreement between Administrative Agent and a lender providing the
Working Capital Facility may be entered into, amended, or modified by
Administrative Agent with the consent of the Required Lenders.



                                      (59)
<PAGE>   64

         SECTION 12.12 Performance of Duties.

         The Borrowers' joint and several obligations under this Agreement and
each of the Loan Documents shall be performed by the Borrowers at their sole
cost and expense.

         SECTION 12.13 All Powers Coupled with Interest.

         All powers of attorney and other authorizations granted to the Lenders,
the Administrative Agent and any Persons designated by the Administrative Agent
or any Lender pursuant to any provisions of this Agreement or any of the other
Loan Documents shall be deemed coupled with an interest and shall be irrevocable
so long as any of the Obligations remain unpaid or unsatisfied or the Credit
Facility has not been terminated.

         SECTION 12.14 Survival of Indemnities.

         Notwithstanding any termination of this Agreement, the indemnities to
which the Administrative Agent and the Lenders are entitled under the provisions
of this Article XII and any other provision of this Agreement and the Loan
Documents shall continue in full force and effect and shall protect the
Administrative Agent and the Lenders against events arising after such
termination as well as before.

         SECTION 12.15 Titles and Captions.

         Titles and captions of Articles, Sections and subsections in this
Agreement are for convenience only and neither limit nor amplify the provisions
of this Agreement.

         SECTION 12.16 Severability of Provisions.

         Any provision of this Agreement or any other Loan Document which is
prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction,
be ineffective only to the extent of such prohibition or unenforceability
without invalidating the remainder of such provision or the remaining provisions
hereof or thereof or affecting the validity or enforceability of such provision
in any other jurisdiction.

         SECTION 12.17 Counterparts.

         This Agreement may be executed in any number of counterparts and by
different parties hereto in separate counterparts, each of which when so
executed shall be deemed to be an original and shall be binding upon all
parties, their successors and assigns, and all of which taken together shall
constitute one and the same agreement.

         SECTION 12.18 Term of Agreement.

         This Agreement shall remain in effect from the Closing Date through and
including the date upon which all Obligations shall have been indefeasibly and
irrevocably paid and satisfied in full. The Administrative Agent is hereby
permitted to release all Liens on the Collateral in favor of the




                                      (60)
<PAGE>   65

Administrative Agent, for the ratable benefit of itself and the Lenders, upon
repayment of the outstanding principal of and all accrued interest on the Loans,
payment of all outstanding fees and expenses hereunder and the termination of
the Lenders' Commitments. No termination of this Agreement shall affect the
rights and obligations of the parties hereto arising prior to such termination.

         SECTION 12.19 Inconsistencies with Other Documents; Independent Effect
of Covenants.

         (a) In the event there is a conflict or inconsistency between this
Agreement and any other Loan Document, the terms of this Agreement shall
control; provided, that any provision of the Security Documents which imposes
additional burdens on any Borrower or its Subsidiaries or further restricts the
rights of any Borrower or its Subsidiaries or gives the Administrative Agent or
Lenders additional rights shall not solely as a result thereof be deemed to be
in conflict or inconsistent with this Agreement and shall be given full force
and effect.

         (b) Each Borrower expressly acknowledges and agrees that each covenant
contained in Articles VII, VIII or IX hereof shall be given independent effect.
Accordingly, no Borrower shall engage in any transaction or other act otherwise
permitted under any covenant contained in Articles VII, VIII or IX if, before or
after giving effect to such transaction or act, such Borrower shall or would be
in breach of any other covenant contained in Articles VII, VIII or IX.

         SECTION 12.20 Notice of Entire Agreement.

         THIS DOCUMENT AND ALL OF THE OTHER LOAN DOCUMENTS TOGETHER CONSTITUTE A
WRITTEN LOAN AGREEMENT WHICH REPRESENTS THE FINAL AGREEMENT BETWEEN AND AMONG
THE PARTIES HERETO AND MAY NOT BE CONTRADICTED BY EVIDENCE OF PRIOR,
CONTEMPORANEOUS OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO
UNWRITTEN ORAL AGREEMENT AMONG THE PARTIES.

                           [Signature pages to follow]




                                      (61)
<PAGE>   66




         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed under seal by their duly authorized officers, all as of the day and
year first written above.



[CORPORATE SEAL]                    UNITED STATES LIME & MINERALS, INC., as
                                    Borrower

                                    By:
                                             -----------------------------------
                                             Name:
                                                  ------------------------------
                                             Title:
                                                   -----------------------------


                                    TEXAS LIME COMPANY, as Borrower

                                    By:
                                             -----------------------------------
                                             Name:
                                                  ------------------------------
                                             Title:
                                                   -----------------------------


                                    ARKANSAS LIME COMPANY, as Borrower

                                    By:
                                             -----------------------------------
                                             Name:
                                                  ------------------------------
                                             Title:
                                                   -----------------------------


                                    FIRST UNION NATIONAL BANK, as Administrative
                                    Agent and Lender


                                    By:
                                             -----------------------------------
                                             Name:
                                                  ------------------------------
                                             Title:
                                                   -----------------------------


                                    COMPASS BANK, as Lender

                                    By:
                                             -----------------------------------
                                             Name:
                                                  ------------------------------
                                             Title:
                                                   -----------------------------



<PAGE>   67




                                    MERCANTILE BANK OF ARKANSAS, NATIONAL
                                    ASSOCIATION, as Lender


                                    By:
                                             -----------------------------------
                                             Name:
                                                  ------------------------------
                                             Title:
                                                   -----------------------------


                                    FIRST NATIONAL BANK, as Lender


                                    By:
                                             -----------------------------------
                                             Name:
                                                  ------------------------------
                                             Title:
                                                   -----------------------------


                                    MINNESOTA VALLEY BANK, as Lender


                                    By:
                                             -----------------------------------
                                             Name:
                                                  ------------------------------
                                             Title:
                                                   -----------------------------


                                    SAND RIDGE BANK, as Lender


                                    By:
                                             -----------------------------------
                                             Name:
                                                  ------------------------------
                                             Title:
                                                   -----------------------------


                                    BREMER BANK NATIONAL ASSOCIATION, as Lender

                                    By:
                                             -----------------------------------
                                             Name:
                                                  ------------------------------
                                             Title:
                                                   -----------------------------


<PAGE>   68



                                    DANVILLE STATE BANK, as Lender


                                    By:
                                             -----------------------------------
                                             Name:
                                                  ------------------------------
                                             Title:
                                                   -----------------------------


                                    FIRST BANKERS TRUST COMPANY, NATIONAL
                                    ASSOCIATION, as Lender


                                    By:
                                             -----------------------------------
                                             Name:
                                                  ------------------------------
                                             Title:
                                                   -----------------------------


                                    SECURITY STATE BANK, as Lender


                                    By:
                                             -----------------------------------
                                             Name:
                                                  ------------------------------
                                             Title:
                                                   -----------------------------


                                    ACKLEY STATE BANK, as Lender


                                    By:
                                             -----------------------------------
                                             Name:
                                                  ------------------------------
                                             Title:
                                                   -----------------------------


                                    INTEGRITY BANK PLUS, as Lender


                                    By:
                                             -----------------------------------
                                             Name:
                                                  ------------------------------
                                             Title:
                                                   -----------------------------



<PAGE>   69



                                    FIRST STATE BANK OF OKABENA, INC., as Lender


                                    By:
                                             -----------------------------------
                                             Name:
                                                  ------------------------------
                                             Title:
                                                   -----------------------------


<PAGE>   70



                                   Schedule 1

                          (Lenders and Pro Rata Shares)


<TABLE>
<CAPTION>


- ---------------------------------------------------- -------------------------- --------------------------------------
                      LENDER                              PRO RATE SHARE                   PRO RATA SHARES
                                                            PERCENTAGE
- ---------------------------------------------------- -------------------------- --------------------------------------
<S>                                                  <C>                        <C>
First Union National Bank
One First Union Center, TW-10
301 South College Street                                        34%                          $17,000,000
Charlotte, North Carolina 28288-0608
Attention:  Syndication Agency Services
Telephone No.:  (704) 374-2698
Telecopy No.:  (704) 383-0288

- ---------------------------------------------------- -------------------------- --------------------------------------
Compass Bank                                                    24%                          $12,000,000
8080 N. Central Expressway #250
Dallas, Texas 75206
Attention: Paul Voorhies, Vice President
Telephone No.:  (214) 706-8065
Telecopy No.:  (214) 890-8625

- ---------------------------------------------------- -------------------------- --------------------------------------
Mercantile Bank of Arkansas, National Association.              20%                          $10,000,000
401 West Capitol
North Little Rock, Arkansas 72201
Attention:  Tom Dunn
Telephone No.:  (501) 688-1357
Telecopy No.:  (501) 370-4310

- ---------------------------------------------------- -------------------------- --------------------------------------
First National Bank                                             6%                           $3,000,000
20900 S. Western Avenue
Olympia Fields, Illinois 60461
Attention:  Brent Frank
Telephone No.:  (708) 503-7990
Telecopy No.:  (708) 481-5388

- ---------------------------------------------------- -------------------------- --------------------------------------
Minnesota Valley Bank                                           4%                           $2,000,000
300 South Washington
Redwood Falls, Minnesota 56283
Attention:  Brian Matzke
Telephone No.:  (507) 637-4321
Telecopy No.:  (507) 637-4301

- ---------------------------------------------------- -------------------------- --------------------------------------
</TABLE>

<PAGE>   71

<TABLE>
<S>                                                  <C>                        <C>
- ---------------------------------------------------- -------------------------- --------------------------------------
Sand Ridge Bank                                                 2%                           $1,000,000
2611 Highway Avenue
Highland, Indiana  46322
Attention:  Donald L. Harris
Telephone No.:  (219) 972-7344
Telecopy No.:  (219) 972-7360

- ---------------------------------------------------- -------------------------- --------------------------------------
Bremer Bank National Association                               3.3%                          $1,650,000
445 Minnesota Street, Suite 2000
St. Paul, Minnesota  55101
Attention:  Diane Pardhun
Telephone No.:  (651) 552-2457
Telecopy No.:  (651) 312-3750

- ---------------------------------------------------- -------------------------- --------------------------------------
Danville State Bank                                             2%                           $1,000,000
901 Main Street
Danville, Arkansas 72833
Attention:  Philip Alexander
Telephone No.:  (501) 495-2236
Telecopy No.:  (501) 495-4656

- ---------------------------------------------------- -------------------------- --------------------------------------
First Bankers Trust Company, National                           2%                           $1,000,000
Association
1201 Broadway
Quincy, Illinois 62301
Attention: Tommy Lay
Telephone No.:  (217) 221-8612
Telecopy No.:  (217) 228-8079
- ---------------------------------------------------- -------------------------- --------------------------------------
Security State Bank                                             1%                            $500,000
701 E. Howard Street
Hibbling, Minnesota 55746-1717
Attention:  Gene Meyer
Telephone No.:  (218) 263-2284
Telecopy No.:  (218) 263-4782

- ---------------------------------------------------- -------------------------- --------------------------------------
Ackley State Bank                                               1%                            $500,000
650 Main Street
Ackley, Iowa 50601
Attention:  Kent Strensland
Telephone No.:  (515) 847-2651
Telecopy No.:  (515) 847-2011

- ---------------------------------------------------- -------------------------- --------------------------------------
Integrity Bank Plus                                            0.4%                           $200,000
726 Main Street
Wabasso, Minnesota 56293
Attention: Charles Robasse
Telephone No.:  (507) 342-5111
Telecopy No.:  (507) 342-5600

- ---------------------------------------------------- -------------------------- --------------------------------------
</TABLE>


<PAGE>   72

<TABLE>
<S>                                                  <C>                        <C>
- ---------------------------------------------------- -------------------------- --------------------------------------
First State Bank of Okabena, Inc.                              0.3%                           $150,000
117 S. Minnesota Avenue
Okabena, Minnesota  56161
Attention:  Dennis Hartman
Telephone:  (507) 853-4421
Telecopy:  (507) 853-4559

- ---------------------------------------------------- -------------------------- --------------------------------------
                           TOTALS                              100%                          $50,000,000
- ---------------------------------------------------- -------------------------- --------------------------------------
</TABLE>




<PAGE>   1
                                                                   EXHIBIT 10(b)

                              SECOND AMENDMENT TO
                AMENDED AND RESTATED LOAN AND SECURITY AGREEMENT

         This Second Amendment to Amended and Restated Loan and Security
Agreement (this "Second Amendment") dated as of April 22, 1999 by and among
United States Lime & Minerals, Inc., a Texas corporation ("U.S. Lime"), Texas
Lime Company, a Texas corporation ("TLC"), and Arkansas Lime Company, an
Arkansas corporation ("ALC," and together with U.S. Lime and TLC, collectively
referred to as the "Borrowers" and individually as a "Borrower"), and First
Union National Bank, a national banking association, as successor to CoreStates
Bank, N.A. ("Bank").

                                   BACKGROUND

         A. Borrowers and Bank are parties to an Amended and Restated Loan and
Security Agreement dated December 30, 1997, as amended by the First Amendment
to Amended and Restated Loan and Security Agreement (collectively, the "Loan
Agreement"), pursuant to which Bank continued and restated certain credit
facilities for the benefit of Borrowers under the terms and conditions set
forth therein. All initially capitalized terms used in this Second Amendment,
unless otherwise specifically defined herein, shall have the meanings ascribed
to them in the Loan Agreement.

         B. Borrowers, Bank, as Administrative Agent ("Administrative Agent")
for itself and the other Lenders from time to time party to the Credit
Agreement referenced below (the "Lenders"), and the other Lenders are parties
to the Credit Agreement dated as of April 22, 1999 (as the same may be amended,
restated, supplemented or otherwise modified and in effect from time to time,
the "Credit Agreement"). Lenders have agreed, subject to the terms and
conditions of the Credit Agreement, to lend to Borrowers the sum of $50,000,000
on a term loan basis secured by substantially all of the respective Borrowers'
personal property other than Accounts, Inventory, and related personal
property, and by mortgages or deeds of trust on certain real property owned by
ALC and TLC.

         C. The Credit Agreement contemplates that Borrowers may maintain a
committed working capital facility not to exceed $4,000,000 in the maximum
principal amount outstanding at any one time, which facility may be secured by
all of the Borrowers' respective Accounts, Inventory, and related personal
property. Bank and Borrowers desire to further amend the Loan Agreement to
maintain the Revolving Credit as Borrowers' working capital facility, according
to the terms hereof, and to terminate the Term Loan, Line of Credit and the
Second Revolving Credit under the Loan Agreement. Bank and Borrowers have
agreed to such modifications subject to the terms and conditions hereof with
the intention that the Revolving Credit contemplated by the Loan Agreement as
hereby amended shall constitute the Working Capital Facility for purposes of
the Credit Agreement.

         NOW, THEREFORE, in consideration of the foregoing and of the mutual
covenants set

<PAGE>   2

forth herein, the parties hereto, intending to be legally bound hereby, agree
as follows:

         1. Ratification. This Second Amendment is a modification of the Loan
Agreement pursuant to Section 9.2 thereof. Except as expressly set forth
herein, or in any amendment to any of the documents referred to herein,
Borrowers and Bank acknowledge and agree that each and every term, condition
and provision of the Loan Agreement is hereby ratified and confirmed in full.

         2. Term Loan Repaid in Full. Bank acknowledges repayment in full of
the entire principal balance and all accrued and unpaid interest on the Term
Loan on the date hereof. All references to any Fixed Rate Loan, the Term Loan,
the Term Loan Indebtedness, the Term Loan Amortization Date, the Term Loan
Termination Date, and the Term Note in the Loan Agreement shall have no force
or effect after the date hereof.

         3. Line of Credit and Second Revolving Credit Terminated. The Line of
Credit and the Second Revolving Credit are hereby terminated as of the date
hereof, and Borrowers acknowledge that no further credit availability exists
thereunder. There is no principal balance outstanding or any accrued and unpaid
interest outstanding under the Line of Credit or the Second Revolving Credit on
the date hereof. All references to the Line of Credit, the Line of Credit
Loans, the Line of Credit Note, the Line of Credit Termination Date, the Second
Revolving Credit, the Second Revolving Credit Note, and the Second Revolving
Credit Termination Date in the Loan Agreement shall have no force or effect
after the date hereof.

         4. Outstanding Indebtedness. Borrowers hereby unconditionally
acknowledge that, as of the date hereof, there is no outstanding principal
balance under the Revolving Credit and the aggregate face amount of outstanding
undrawn Letters of Credit is $504,802. Borrowers acknowledge and agree that the
foregoing balance of the Revolving Credit (including the amount of all draws
under outstanding Letters of Credit), together with interest which shall accrue
from the date hereof at the rates set forth herein, is owing to Bank without
claim, counterclaim, recoupment, defense or setoff of any kind.

         5. Certain Collateral Released. In connection with Borrowers' grant of
security interests in substantially all of Borrowers' personal property and
mortgages and deeds of trust on substantially all of Borrowers' real estate
contemplated by the Credit Agreement, Bank has released the Mortgages, the
Mortgage Confirmations and the Second Mortgages, as well as the security
interests granted by Borrowers in substantially all of each Borrower's personal
property other than Accounts, Inventory and related personal property as
granted by Section 3.1.1 of the Loan Agreement. All references to the
Mortgages, the Mortgage Confirmations and the Second Mortgages in the Loan
Agreement shall have no force or effect after the date hereof.

         6. Confirmation and Re-grant of Security Interest in Accounts and
Inventory. Borrowers hereby ratify and confirm the grant of security interest
in and to all of each Borrower's Accounts, Inventory, books and records in
connection therewith, and all proceeds thereof as collateral security


                                       2
<PAGE>   3

for Borrowers' joint and several liability for the Indebtedness, and in
consideration of the extension of the Revolving Credit and the release of
certain Collateral, Borrowers hereby re-grant, re-assign and deliver to Bank a
continuing first priority security interest in and lien on all of each
Borrower's right, title and interest in and to the Collateral (as defined in
the Loan Agreement as amended hereby).

         7. Added, Amended, and Amended and Restated Definitions. Each of the
following definitions in Section 1.1 of the Loan Agreement is hereby added, or
if the term is already defined in Section 1.1 of the Loan Agreement, the
definition is hereby amended and restated in its entirety as follows:

                  "Accounts" means all "accounts" (as defined in the UCC) now
owned or hereafter created or acquired by any Borrower including, without
limitation, all of the following now owned or hereafter created or acquired by
any Borrower: (a) accounts receivable, contract rights, book debts, notes,
drafts and other obligations or indebtedness owing to any Borrower that
evidence or arise from the sale, lease or exchange of goods or other property
and/or the performance of services; (b) each Borrower's rights in, to and under
all purchase orders for goods, services or other property sold or to be sold by
such Borrower; (c) each Borrower's rights to any goods, services or other
property represented by any of the foregoing (including returned or repossessed
goods and unpaid sellers' rights of rescission, replevin, reclamation and
rights to stoppage in transit); (d) moneys due to or to become due to any
Borrower under all contracts for the sale, lease or exchange of goods or other
property and/or the performance of services (whether or not yet earned by
performance on the part of such Borrower); and (e) Proceeds of any of the
foregoing and all collateral security and guaranties of any kind given by any
Person with respect to any of the foregoing.

                  "Adjusted LIBOR" means and refers to the LIBOR.

                  "Adjusted LIBOR Loans" means Cash Advances under the
Revolving Credit bearing interest at a rate determined with reference to the
Adjusted LIBOR.

                  "Base Rate Loans" mean applicable portions of the Revolving
Credit bearing interest at a rate determined with reference to the Base Rate.

                  "Borrowing Base" means the sum of (i) 90% of Borrowers'
Eligible Accounts; plus (ii) the lesser of $1,000,000 and 50% of Eligible
Inventory; less (a) the aggregate amount of all outstanding Cash Advances, and
(b) the face amount of all issued and outstanding Letters of Credit.

                  "Borrowing Base Certificate" means the certificate in the
form attached hereto as Exhibit A to be delivered by Borrower in accordance
with Section 6.1.1 hereof to assist Bank in the determination of the amount
which may be borrowed under the Revolving Credit.

                  "Cash Advance" means any advance of cash to any Borrower
under the Revolving


                                       3
<PAGE>   4
Credit subject to and in accordance with the provisions of Article 2 hereof.

                  "Collateral" means all of each Borrower's right, title and
interest in and to the following property, whether now owned or hereafter
acquired, arising, created or reacquired and regardless where located: (i) all
Accounts; (ii) all Inventory; (iii) all books, records, ledger cards, files,
correspondence, computer programs, tapes, disks and related data and data
processing software that at any time evidence or contain information relating
to any of the property described in subparts (i) and (ii) above or are
otherwise necessary or helpful in the collection thereof or realization
thereon; (iv) Proceeds of all or any of the property described in subparts (i)
- - (iii) above; and (v) any other property of any kind which such Borrower may
hereafter at any time deliver to Bank to secure the obligations of such
Borrower owed to Bank.

                  "Debt Service" means the sum of (a) for a period of four
consecutive quarters, Interest Expense in respect of such period, plus (b) (i)
for the period commencing April 22, 1999 through June 30, 2000, an amount equal
to one fifteenth (0.0667) of all outstanding funded Debt (excluding
Indebtedness under the Revolving Credit), and (ii) for all times after June 30,
2000, an amount equal to the principal payments on all Debt due and payable
during the next succeeding four quarters (except for any period which includes
the Termination Date under the Credit Agreement, the Obligations (as defined in
the Credit Agreement) due on the Termination Date).

                  "Debt Service Coverage Ratio" as of last day of any fiscal
quarter means the ratio of Borrowers' EBITDA to Debt Service, both calculated
for the period of four consecutive calendar quarters most recently ended as of
such day.

                  "EBITDA" means Borrowers' consolidated Net Income for a
period, plus the sum of the following for such period (without duplication and
only to the extent each is deducted from Borrowers' revenues to determine Net
Income): (i) Interest Expense, (ii) taxes, (iii) depreciation, (iv)
amortization, and (v) depletion for such period.

                  "Eligible Account" means an Account of a Borrower which meets
the following requirements:

                          (i)    The Account arose in the ordinary course of
                  the business of a Borrower from a bona fide absolute sale of
                  Goods by such Borrower (and not on consignment, approval or
                  sale-or-return basis or subject to any other repurchase or
                  return agreement), or for services performed by such
                  Borrower, and such Goods have been shipped to the appropriate
                  account debtor or the account debtor has agreed to accept
                  invoicing of product while delaying actual shipment, or the
                  services have actually been performed for the appropriate
                  account debtor;


                                       4
<PAGE>   5

                          (ii)   The Account is based upon an enforceable order
                  or contract, written or oral, for Goods shipped or services
                  performed, and the same were shipped or actually performed in
                  accordance with the order or contract;

                          (iii)  The title of such Borrower to the Account and,
                  except as to the account debtor, to any Goods is absolute and
                  is lawfully in such Borrower and subject to no other
                  assignment, claim, lien or security interest except that of
                  Bank, and such Borrower has the right of assignment thereof
                  and the power to grant to Bank a security interest therein;

                          (iv)   The amount shown on the books or records of
                  such Borrower and on any invoice or statement delivered to
                  Bank in respect of the Account is owing to such Borrower, and
                  no partial payment has been made thereon except as shown on
                  such books and records and disclosed to Lender;

                          (v)    The Account is a valid and enforceable
                  Account, representing an undisputed indebtedness of an
                  account debtor to Borrower, is not subject to any claim or
                  reduction, counterclaim, set-off, recoupment, or any claim
                  for credits, allowances or adjustments by the account debtor
                  because of returned, inferior or damaged Goods or
                  unsatisfactory services, or for any other reason, except for
                  discounts customarily allowed by such Borrower in the
                  ordinary course of its business for prompt payment;

                          (vi)   The account debtor has not returned or refused
                  to retain any of the Goods, the sale of which gave rise to
                  the Account, or the Account Debtor has not, upon partial
                  payment of amounts owing to such Borrower, reserved the right
                  to return any of the Goods, the sale of which gave rise to
                  the Account;

                          (vii)  The Account has been outstanding not more than
                  60 days from the invoice date;

                          (viii) The Account did not arise out of a contract
                  with, or order from, an Account Debtor that, by its terms,
                  forbids or makes void or enforceable the assignment by such
                  Borrower to Bank of the Account arising with respect thereto;

                          (ix)   Such Borrower has received no Instrument (as
                  defined in the UCC) in payment of the Account, nor any
                  Chattel Paper with respect to the Goods, the sale of which
                  gave rise to the Account, and, if any Instrument or Chattel
                  Paper is at any time received, Borrower will immediately
                  notify Bank and, at the latter's request, endorse and/or
                  assign and deliver the same to Bank;

                          (x)    Such Borrower has not received notice of the
                  death of the account debtor, if a natural person, or a
                  general partner thereof if such death causes


                                       5
<PAGE>   6
                  dissolution of the account debtor; nor of the dissolution,
                  termination of existence, insolvency, business failure or
                  cessation, appointment of a receiver for all or any part of
                  the property of, assignment for the benefit of creditors by,
                  or the filing of a petition in bankruptcy or insolvency laws,
                  now or hereafter enacted, by or against the Account Debtor.
                  Upon the receipt by such Borrower of any such notice, it will
                  immediately notify Bank thereof;

                          (xi)   The Account Debtor is not an Affiliate of
                  Borrower;

                          (xii)  The Account is owing from an Account Debtor
                  whose principal place of business and office from which its
                  order was placed is within the United States;

                          (xiii) The Account is not an account owing from an
                  Account Debtor which is a government (federal, state or
                  local) or an agency or instrumentality of a government, or if
                  the Account is an account owing from an Account Debtor which
                  is a government (federal, state or local) or an agency or
                  instrumentality of a government, all requirements necessary
                  to fully assign all rights with respect to such Account to
                  Bank have been met or complied with, including the
                  requirements of the Federal Assignment of Claims Act, if
                  applicable, and such Account Debtor shall have given all such
                  consents, permissions or agreements as are necessary to fully
                  assign, and make payments on, such Account to Lender.

                  An Account which is at any time an Eligible Account,
                  but which subsequently fails to meet any of the foregoing
                  requirements, shall forthwith cease to be an Eligible
                  Account.

                  "Eligible Inventory" shall mean Borrowers' finished inventory
of fully-processed quicklime, hydrated lime, sand, agricultural lime, ag-lime,
aggregate, and pulverized limestone held for sale and other similar products
held for sale, in each case whether held in bulk, bagged or otherwise, but not
including any raw materials or work in process of each Borrower, and not
including any sale subject to sale-or-return, consignment or on approval or
subject to any repurchase or return agreement. Inventory which is at any time
Eligible Inventory, but which subsequently fails to meet any of the foregoing
requirements shall forthwith cease to be Eligible Inventory.

                  "Interest Rate Option" means the Base Rate or the Adjusted
LIBOR selected by Borrowers as permitted by this Agreement.

                  "Inventory" means all "inventory" (as defined in the UCC),
now owned or hereafter acquired by any Borrower, wherever located including,
without limitation, finished goods, raw materials, work in process, spare parts
and other materials and supplies (including packaging and shipping materials)
used or consumed in the manufacture or production thereof and goods which are
returned to or repossessed by any Borrower.


                                       6
<PAGE>   7

                  "LIBOR" means the rate per annum for U.S. Dollar deposits for
an Interest Period as reported on Telerate page 3750 as of 11:00 am, London
time, on the second London Business Day before the relevant Interest Period
begins (or if not so reported, then as determined by the Bank from another
recognized source or interbank quotation. LIBOR shall be rounded to the next
highest 1/100th of 1%, or if Borrowers shall have entered into any interest
rate hedging agreement with Bank, LIBOR shall be rounded five decimal places as
set forth in the 1991 ISDA Definitions published by the International Swaps and
Derivatives Association, Inc.

                  "Loans" mean collectively all Cash Advances under the
Revolving Credit, and a "Loan" means any Cash Advance under the Revolving
Credit.

                  "Loan Documents" mean this Agreement, as amended and as may
be hereafter amended, the Revolving Credit Note, as amended, restated,
supplemented or otherwise modified, and as hereafter may be amended, restated,
supplemented or otherwise modified, all financing statements filed or in
connection with this Agreement relating to the Collateral, and all certificates
of Borrowers, or any Borrower, delivered pursuant to this Agreement.

                  "Permitted Liens" means (i) liens for taxes, assessments or
governmental charges or claims which are not overdue or which are being
contested in good faith by appropriate proceedings promptly instituted and
diligently conducted, if a reserve or other appropriate provision, if any, as
shall be required by GAAP shall have been made therefor; (ii) statutory liens
of landlords and liens of carriers, warehousemen, materialmen, repairmen,
suppliers and other like liens incurred in the ordinary course of business for
sums not yet delinquent or being contested in good faith by appropriate
proceedings promptly instituted and diligently conducted, if a reserve or other
appropriate provision, if any, as shall be required by GAAP shall have been
made therefor; (iii) liens (other than any lien imposed by ERISA) incurred or
deposits made in the ordinary course of business in connection with workers'
compensation or unemployment insurance and other types of social security; (iv)
liens incurred or deposits made to secure the performance of tenders, statutory
obligations, surety and appeal bonds, bids, leases, government contracts,
performance and return-of-money bonds and other similar obligations incurred in
the ordinary course of business (exclusive of obligations for the payment of
borrowed money); (v) any judgment lien; provided that, within 45 days after the
entry of the judgment secured thereby, such judgment shall be discharged or
execution thereof shall be stayed pending appeal; and further provided that
such judgment shall be discharged within 60 days after the expiration of any
such stay; (vi) other liens and encumbrances permitted by Section 9.3 of the
Credit Agreement; (vii) liens, security interests and other encumbrances in
favor of Administrative Agent under the Credit Agreement for the benefit of the
Lenders thereunder; and (viii) liens set forth on Schedule 5.1.3 hereto.

                  "Proceeds" means all "proceeds" (as defined in the UCC) of,
and all other profits, rentals or receipts, in whatever form, arising from the
collection, sale, lease, exchange, assignment, licensing or other disposition
of, or realization upon, any Collateral, including, without limitation, all
claims of any Borrower against third parties for loss of, damage to or
destruction of, or for proceeds


                                       7
<PAGE>   8
payable under, or unearned premiums with respect to, policies of insurance with
respect to any Collateral, and any condemnation or requisition payments with
respect to any Collateral, in each case whether now existing or hereafter
arising.

                  "Revolving Credit Termination Date" means April 21, 2000, or
such later date as may be agreed to in writing by Bank.

                  "Tangible Net Worth" means the sum of each Borrower's (i)
capital stock, (ii) cumulative retained earnings, (iii) additions to capital,
(iv) capital in excess of par or stated value, and (v) any other account which,
in accordance with GAAP constitutes shareholders equity, less the sum of each
Borrower's (a) treasury stock, and (b) intangible assets carried on the books
of Borrowers.

                  "UCC" means the Uniform Commercial Code as in effect on the
date hereof in the Commonwealth of Pennsylvania; provided that if by reason of
mandatory provisions of law, the perfection or the effect of perfection or
non-perfection of the security interests in any Collateral or the availability
of any remedy hereunder is governed by the Uniform Commercial Code as in effect
on or after the date hereof in any other jurisdiction, "UCC" means the Uniform
Commercial Code as in effect in such other jurisdiction for purposes of the
provisions hereof relating to such perfection or effect of perfection or
non-perfection or availability of such remedy.

         8.       Revolving Credit Subject to Borrowing Base. Section 2.2.1 of
the Loan Agreement is hereby amended and restated in its entirety as follows:

                  2.2.1 Revolving Credit. Provided that no Event of Default or
         Unmatured Event of Default has occurred and is continuing and subject
         to the terms and conditions set forth herein, commencing on the
         Closing Date and expiring on the Revolving Credit Termination Date,
         Bank shall extend to Borrowers the Revolving Credit, pursuant to which
         Bank: (i) shall extend Cash Advances to Borrowers, in amounts not to
         exceed $4,000,000 outstanding at any one time, and which, if not
         exhausting the unadvanced portion of the Revolving Credit or the
         Borrowing Base, shall be at least $50,000 or integral multiples
         thereof requested by the Borrowers (within the limits of the Revolving
         Credit and the Borrowing Base), which the Borrowers may, from time to
         time, repay, and, subject to the terms hereof, reborrow; and (ii)
         shall, within the limits of the Revolving Credit, issue Letters of
         Credit in the aggregate face amount issued at any one time not to
         exceed the sum of $750,000. Borrowers may not reborrow under the
         Revolving Credit after the Revolving Credit Termination Date.

         9.       Revolving Credit Interest Rate. Section 2.2.2 of the Loan
Agreement is hereby amended and restated in its entirety as follows:

                  2.2.2 Revolving Credit Interest Rate. Cash Advances under the
         Revolving Credit


                                       8
<PAGE>   9
        shall bear interest on the unpaid principal balance thereof from the
        Funding Date until paid in full (whether by acceleration or otherwise)
        at the sum of (i) the Base Rate or the Adjusted LIBOR on the relevant
        Interest Rate Determination Date as selected by Borrowers at the time a
        Notice of Borrowing or Notice of Rate Election is given pursuant to
        Sections 2.4.1 and 2.4.2 hereof, plus (ii) an additional percentage per
        annum determined in reference to Borrowers' Cash Flow Ratio set forth
        in the table below:

                         Revolving Credit Interest Rate

<TABLE>
<CAPTION>
Cash Flow Ratio                                               LIBOR plus                    Base Rate

Greater than or equal to:       But less than:                --------------                ----------------

<S>                             <C>                           <C>                           <C>
6.0:1                           -----                         3.55%                         plus 1.25%
5.5:1                           6.0:1                         3.30%                         plus 1.00%
5.0:1                           5.5:1                         3.05%                         plus 0.75%
4.5:1                           5.0:1                         2.80%                         plus 0.50%
4.0:1                           4.5:1                         2.55%                         plus 0.25%
3.5:1                           4.0:1                         2.30%                         plus 0
3.0:1                           3.5:1                         2.10%                         plus 0
2.5:1                           3.0:1                         1.65%                         plus 0
- -------                         2.5:1                         1.40%                         minus 0.25%
</TABLE>

                  The Cash Flow Ratio shall be tested quarterly, as of the last
                  day of each Calendar Quarter, by Borrowers' delivery to Bank
                  within 30 days after each Calendar Quarter of a completed and
                  executed Ratio Certificate as of the last day of such
                  Calendar Quarter on a rolling four Calendar Quarter
                  historical basis, commencing with the Calendar Quarter ending
                  June 30, 1999. The applicable interest rate for Cash Advances
                  under the Revolving Credit shall change with any change in
                  the Cash Flow Ratio as reported to Bank on a properly
                  completed and executed Ratio Certificate within 30 days after
                  the expiration of each Calendar Quarter. Any change in the
                  Cash Flow Ratio shall change the interest rate applicable to
                  all outstanding Cash Advances under the Revolving Credit and
                  shall become effective five business days after Bank's timely
                  receipt of a properly completed and executed Ratio
                  Certificate without retroactive effect.

         10.      Renewal of Revolving Credit. Section 2.2.5 of the Loan
Agreement is hereby amended and restated in its entirety as follows:


                                       9
<PAGE>   10

                  2.2.5 Renewal. Upon being so requested by Borrowers in
         writing at least 90 days prior to the Revolving Credit Termination
         Date, Bank may, but shall not be obligated to, renew the Revolving
         Credit for an additional 364-day period by giving written notice to
         Borrowers in the manner set forth in Section 9.3 hereof on or before
         60 days prior to the Revolving Credit Termination Date. In the event
         Bank fails to provide any notice to Borrowers regarding renewal of the
         Revolving Credit, the Revolving Credit Termination Date shall not be
         extended and all outstanding Cash Advances under the Revolving Credit
         and all interest and Bank's Costs pertaining thereto shall become due
         and payable as provided in Section 2.2.3 hereof. In the event that any
         Letter of Credit is outstanding on the Revolving Credit Termination
         Date which Bank has elected not to renew, Borrowers shall post cash
         collateral with Bank in an amount equal to the lesser of (i) the face
         amount, or (ii) the aggregate undrawn amount, of all outstanding
         Letters of Credit on the Revolving Credit Termination Date.

         11.      Unused Fee. Section 2.2.8 of the Loan Agreement is hereby
amended and restated in its entirety as follows:

                  2.2.8 Unused Fee. Borrowers agree to pay to Bank a fee at an
         annual rate of one fourth of one percent (.25%) per annum of the
         aggregate daily average unused portion of the Revolving Credit from
         the Closing Date to the Revolving Credit Termination Date, payable in
         arrears on the last day of each Calendar Quarter and on the Revolving
         Credit Termination Date.

         12.      Notice of Borrowing and Notice of Rate Election Replaced.
After the date hereof, Notices of Borrowing and Notices of Rate Election shall
only pertain to Cash Advances under the Revolving Credit. Schedule 2.4.1, the
form of Notice of Borrowing, and Schedule 2.4.2, the form of Notice of Rate
Election, are each hereby amended and restated in the forms attached to this
Second Amendment as Schedule 2.4.1 and Schedule 2.4.2, respectively. The
interest rates applicable to Interest Rate Options selected by Borrowers in a
Notice of Borrowing or Notice of Rate Election shall be determined with
reference to the most recent Ratio Certificate prepared by Borrowers for the
preceding Calendar Quarter.

         13. Maximum Available Credit. Section 2.4.13 of the Loan Agreement is
hereby amended and restated in its entirety as follows:

                  2.4.13 Maximum Available Credit for All Loans.
         Notwithstanding anything herein to the contrary, the outstanding
         principal balance of all Cash Advances under the Revolving Credit,
         including the aggregate face amount of all issued Letters of Credit,
         shall not exceed the lesser of (i) $4,000,000, or (ii) the Borrowing
         Base then in effect. The maximum available credit under this Agreement
         shall not exceed the sum of (a) $4,000,000, plus (b) all interest,
         Bank's Costs and any other amount due from Borrowers to Bank hereunder
         or pursuant to any other Loan Document.


                                       10
<PAGE>   11

         14.      Mandatory Payments. Section 2.4.14 of the Loan Agreement is
hereby amended and restated in its entirety as follows:

                  2.4.14 Mandatory Payments. In the event that the principal
         amount outstanding under the Revolving Credit shall at any time exceed
         $4,000,000, then Borrowers shall immediately repay such excess to
         Bank.

         15.      Monthly Borrowing Base Certificate. The following sentence is
hereby added at the end of Section 6.1.1 of the Loan Agreement:

                  "Borrowers shall furnish to Bank monthly, within 10 Business
                  Days after the end of each calendar month, a Borrowing Base
                  Certificate duly completed and executed by Borrowers'
                  principal financial and accounting officer, together with an
                  aging of each Borrower's Accounts and a report of each
                  Borrower's Inventory amounts;"

         16.      Financial Covenants.

                  16.1 After the date hereof, Sections 6.1.13.1 (minimum net
worth), 6.1.13.2 (testing Borrowers' ratio of Total Liabilities to Net Worth),
6.1.13. 3 (testing Borrowers' ratio of Cash Flow to Fixed Obligations),
6.1.13.4 (testing Borrowers' Interest Coverage Ratio) shall have no force or
effect after the date hereof.

                  16.2 The following sections are hereby added to the Loan
Agreement as Sections 16.1.13.5 and 16.1.13.6:

                       16.1.13.5 Debt Service Coverage Ratio. As of any fiscal
                       quarter end, Borrowers shall not permit the Debt Service
                       Coverage Ratio on such date for the period of four (4)
                       consecutive fiscal quarters ending on or immediately
                       prior to such date to be less than 1.10 to 1.0 for all
                       such four-quarter periods ending on and before December
                       31, 2001, and 1.20 to 1.0 for all such four-quarter
                       periods ending on and after March 31, 2002.

                       16.1.13.6 Tangible Net Worth. Borrowers shall not permit
                       Tangible Net Worth as of the last day of any fiscal
                       quarter to be less than the sum of $25,000,000 plus 50%
                       of Borrowers' cumulative Net Income from January 1, 1999
                       calculated for each succeeding fiscal quarter through
                       the last day of such fiscal quarter.

         17.      Negative Covenants.

                  17.1 New subparagraph (vii) is hereby added to Section 7.1.1
of the Loan Agreement as follows: "(vii) indebtedness to the Lenders under the
Credit Agreement."


                                       11
<PAGE>   12

                  17.2 New subparagraph (v) is hereby added to Section 7.1.2 of
the Loan Agreement as follows: "(v) liens granted to Administrative Agent for
the benefit of the Lenders under, and liens otherwise permitted by, the Credit
Agreement."

                  17.3 Section 7.1.4 of the Loan Agreement is hereby amended
and restated in its entirety as follows:

                       7.1.4 Except (i) as permitted by the Credit Agreement,
                       (ii) as set forth on Schedule 5.1.15 attached hereto,
                       and (iii) for miscellaneous employee travel and other
                       advances and guarantees not to exceed $20,000 in each
                       case and $100,000 in the aggregate, and as otherwise
                       permitted under Section 7.1.10, make loans to, invest in
                       the securities of, or endorse, guaranty, or otherwise
                       become a surety except in the ordinary course of
                       business for the payment or performance of any liability
                       or obligation of, any individual, firm or corporation
                       other than a Borrower or a subsidiary thereof, except
                       that Borrowers may invest in Cash Equivalents;

                  17.4 Section 7.1.5 of the Loan Agreement is hereby amended
and restated in its entirety as follows:

                       7.1.5 Change the general character of any Borrower's
                       business from that in which it is currently engaged or
                       proposes to be engaged; except as permitted by the
                       Credit Agreement, remove any of such Borrower's tangible
                       assets with a book value of more than $500,000 that are
                       now located on such Borrower's Real Estate to a location
                       other than another parcel of such Borrower's or another
                       Borrower's Real Estate and any Borrower may, in the
                       ordinary course of business, cause or permit the removal
                       of moveable equipment, or equipment in repair or the
                       like off-premises or otherwise in transit and may have
                       inventory or equipment in transit or in warehouses;
                       enter into proceedings in total or partial dissolution;
                       except as permitted by the Credit Agreement, merge or
                       consolidate with or into any other corporation, or
                       permit another corporation to merge into it, or acquire
                       all or substantially all of the assets or securities of
                       any other Person; except as permitted by the Credit
                       Agreement, pay or declare any dividends or distribution
                       on any of such Borrower's capital stock; except (i) as
                       permitted by the Credit Agreement, (ii) for dividends
                       and other distributions payable in stock, and (iii) for
                       dissolution into, mergers and consolidations with,
                       acquisitions of assets or securities of, and dividends
                       and other distributions to, another Borrower or a
                       subsidiary thereof and except that the Bank will not
                       unreasonably withhold its consent to any proposed
                       acquisition in which the consideration and liabilities
                       assumed does not exceed $250,000;


                                       12
<PAGE>   13

                  17.5 Section 7.1.9 of the Loan Agreement is hereby amended
and restated in its entirety as follows:

                       7.1.9 Except (i) as permitted by the Credit Agreement,
                       and (ii) as part of a reasonable overall compensation
                       structure, enter into any transaction with any officer,
                       director or shareholder (other than another Borrower) of
                       any entity comprising a Borrower, or any Affiliate
                       (other than another Borrower) of any of them, for less
                       than full value or on terms or conditions not consistent
                       with transactions in similar circumstances with other
                       Persons;

                  17.6 Section 7.1.12 of the Loan Agreement is hereby amended
and restated in its entirety as follows:

                       7.1.12 Except as permitted by the Credit Agreement,
                       incur any Operating Lease Expense in excess of $500,000
                       in any Fiscal Year, unless otherwise consented to in
                       writing by Bank, which consent shall not be unreasonably
                       withheld.

         18.      Representations and Warranties. To induce Bank to enter into
this Second Amendment, Borrowers jointly and severally represent and warrant to
Bank as follows:

                  18.1 After giving effect to the modifications contained
herein, all representations, warranties and covenants made by Borrowers to Bank
in the Loan Agreement (except those relating to a specific date) are true and
correct in all material respects as of the date hereof, with the same force and
effect as though made as of the date hereof;

                  18.2 No Event of Default or Unmatured Event of Default has
occurred and is continuing under the Loan Agreement as of the date hereof;

                  18.3 Each Borrower is a corporation validly subsisting under
the laws of the state of its incorporation; the execution, delivery and
performance of this Second Amendment and any other documents and instruments
executed and delivered to Bank in connection herewith (i) are within each
Borrower's corporate powers, (ii) have been duly authorized by each Borrower's
Board of Directors, (iii) do not contravene any provision of law or any
indenture, agreement or undertaking to which any Borrower is a party or is
otherwise bound, any Borrower's Certificate of Incorporation, bylaws, or any
resolution of the Board of Directors of any Borrower, and (iv) require no
consent or approval of any governmental authority or any third party; and

                  18.4 This Second Amendment and any other documents and
instruments executed and delivered to Bank in connection herewith have been
validly executed and are enforceable against the Borrower or Borrowers party
thereto in accordance with their respective terms.


                                       13
<PAGE>   14

Any failure of any of the representations and warranties made by Borrowers in
this Second Amendment to be true and correct in all material respects when made
shall constitute an Event of Default under the Loan Agreement.

        19.       Conditions Precedent. The effectiveness of this Second
Amendment, and the performance by Bank of its obligations described herein, are
subject to the conditions precedent that Bank shall have received, in form and
substance satisfactory to Bank:

                  19.1 a completed and executed Ratio Certificate for the
Calendar Quarter ended March 31, 1999;

                  19.2 resolutions of the Boards of Directors of each Borrower
authorizing the execution, delivery and performance of this Second Amendment,
and the other documents and instruments executed and delivered to Bank in
connection herewith, certified by such Borrower's Secretary that the same are
true and complete copies of the originals thereof and remain in full force and
effect, not having been modified or rescinded;

                  19.3 UCC-3 Amendment Statements listing each Borrower as
debtor and Bank as secured party to amend the description of the Collateral;
and.

                  19.4 a completed and executed Borrowing Base Certificate for
the month ended April 30, 1999.

        20.       Miscellaneous.

                  20.1 Entire Agreement. The Loan Agreement, as amended by this
Second Amendment, and the other Loan Documents, embody the entire agreement and
understanding between Bank and Borrowers. The Loan Agreement, together with
this Second Amendment, and all documents executed and delivered herewith,
supersede all prior agreements and understandings relating to subject matter
hereof. This Second Amendment together with the Loan Agreement, and the
documents executed and delivered in connection herewith and therewith shall be
construed as one agreement, and in the event of any inconsistency, the
provisions of any promissory note evidencing a portion of the Indebtedness
shall control over the provisions of this Second Amendment.

                  20.2 Working Capital Facility. The parties mutually
acknowledge that the Loan Agreement as amended by this Second Amendment
constitutes the "Working Capital Facility" for purposes of the Credit
Agreement.

                  20.3 Counterparts. This Second Amendment may be executed in
any number of counterparts and by different parties on separate counterparts,
each of which counterparts, when so executed and delivered, shall be deemed to
be an original and all of which counterparts, taken


                                       14
<PAGE>   15
together, shall constitute but one and the same agreement. This Second
Amendment shall be effective upon the execution and delivery of a counterpart
hereof by each of the parties hereto.

                  20.4 Captions. The captions or headings in this Second
Amendment are for convenience of reference only and in no way define, limit, or
describe the scope or intent of any provision of this Second Amendment.

                  20.5 Successors and Assigns; Governing Law. This Second
Amendment shall be binding upon and inure to the benefit of the respective
parties hereto and their successors and assigns and shall be governed by, and
construed and enforced in accordance with, the internal laws of the
Commonwealth of Pennsylvania without regard to its principles of conflicts of
laws.


                            [signature page follows]


                                       15
<PAGE>   16

         IN WITNESS WHEREOF, the undersigned have executed this Second
Amendment as of the day and year first written above.


<TABLE>
<CAPTION>
                                   BANK:
<S>                               <C>


                                      FIRST UNION NATIONAL BANK
                                      (successor to CoreStates Bank, N.A.)


                                      By:
                                          -------------------------------
                                               CLIFFORD W. KEWLEY,
                                               Vice President

                                   BORROWERS:

                                       UNITED STATES LIME & MINERALS,
                                       INC.

Attest:

By:                                    By:
   -------------------------------         -------------------------------
   Larry T. Ohms, Controller,              Herbert G. A. Wilson, President and
   Secretary, and Treasurer                     Chief Executive Officer

                                       TEXAS LIME COMPANY


By:                                    By:
   -------------------------------         -------------------------------
   Larry T. Ohms, Controller,              Herbert G. A. Wilson, President
   Secretary and Treasurer

                                       ARKANSAS LIME COMPANY


By:                                    By:
   -------------------------------         -------------------------------
   Larry T. Ohms, Controller,              Herbert G. A. Wilson, President
   Secretary and Treasurer
</TABLE>


                                       16

<PAGE>   1

                                                                   EXHIBIT 10(c)

                       UNITED STATES LIME & MINERALS, INC.

                 1992 STOCK OPTION PLAN, AS AMENDED AND RESTATED

         Section 1. Purpose. It is the purpose of the Plan to promote the
interests of the Company and its shareholders by attracting, retaining and
stimulating the performance of selected Employees by giving such Employees the
opportunity to acquire a proprietary interest in the Company and an increased
personal interest in its continued success and progress. Unless otherwise
specified in the option agreement, each Option granted under the Plan shall be
treated as an Incentive Stock Option.

         Section 2. Definitions. As used herein the following terms have the
following meanings:

                  (a) "Affiliate" means any parent or subsidiary corporation of
         the Company within the meaning of Section 424(e) and (f) of the Code.

                  (b) "Board" means the Board of Directors of the Company.

                  (c) "Code" means the Internal Revenue Code of 1986, as amended
         from time to time.

                  (d) "Committee" means the Stock Option Committee described in
         Section 4 hereof.



<PAGE>   2


                  (e) "Common Stock" means the $.10 par value Common Stock of
         the Company.

                  (f) "Company" means United States Lime & Minerals, Inc., a
         Texas corporation.

                  (g) "Employee" means an employee of the Company or an
         Affiliate.

                  (h) "Fair Market Value" means, unless the Committee determines
         otherwise in good faith, the closing sales price on the date in
         question (or, if there was no reported sale on such date, on the last
         preceding day on which any reported sale occurred) of the Common Stock
         reported on the National Association of Securities Dealers Automated
         Quotation System (the "Nasdaq Stock Market") or on any national stock
         exchange on which the Common Stock is then traded; or, if the Common
         Stock is not listed or admitted to trading on any such exchange and is
         not listed as a National Market security on the Nasdaq Stock Market,
         but is quoted on the Nasdaq Stock Market or any similar system then in
         use, "Fair Market Value" shall mean the average of the closing high bid
         and low asked quotations on such system for the Common Stock on the
         date in question.

                  (i) "Incentive Stock Option" means an incentive stock option
         within the meaning of Section 422(b) of the Code.

                  (j) "Option" means an option to purchase shares of Common
         Stock granted pursuant to the provisions of the Plan.

                                      -2-
<PAGE>   3

                  (k) "Optionee" means an Employee who has been granted an
         Option under the Plan.

                  (l) "Plan" means this United States Lime & Minerals, Inc. 1992
         Stock Option Plan, as Amended and Restated.

         Section 3. Number of Shares; Per-Person Limit. Options may be granted
by the Company from time to time under the Plan to purchase an aggregate of
480,000 shares of the authorized Common Stock. If an Option expires or
terminates for any reason without having been exercised in full, the unpurchased
shares subject to such expired or terminated Option shall again be available for
purposes of the Plan. No person may be granted Options under the Plan if, after
such grant, such person will have been granted Options under the Plan that cover
in the aggregate more than 70,000 shares of Common Stock.

         Section 4. Administration of the Plan. The Plan shall be administered
by a Stock Option Committee which shall consist of two or more members of the
Board, each of whom shall be a "Non-Employee Director" within the meaning of
Rule 16b-3 under the Securities Exchange Act of 1934, as amended, and an
"outside director" within the meaning of Section 162(m) of the Code and the
regulations thereunder, or any similar or successor rule, provision or
regulation. Each member of the Committee shall be appointed by and shall serve
at the pleasure of the Board. The Board shall have the sole continuing authority
to appoint members of the Committee


                                      -3-
<PAGE>   4

both in substitution for members previously appointed and to fill vacancies
however caused. The following provisions shall apply to the administration of
the Plan by the Committee:

                  (a) The Committee shall designate one of its members as
         Chairman and shall hold meetings at such times and places as it may
         determine. Each member of the Committee shall be notified in writing of
         the time and place of any meeting of the Committee at least two days
         prior to such meeting, provided that such notice may be waived by a
         Committee member. A majority of the members of the Committee shall
         constitute a quorum, and any action taken by a majority of the members
         of the Committee present at any duly called meeting at which a quorum
         is present (or action unanimously approved in writing) shall constitute
         action by the Committee.

                  (b) The Committee may appoint a Secretary (who need not be a
         member of the Committee) who shall keep minutes of its meetings. The
         Committee may make such rules and regulations for the conduct of its
         business as it may determine.

                  (c) No member of the Committee shall be eligible to receive an
         Option under the Plan.

                  (d) The Committee shall have full authority subject to the
         express provisions of the Plan to interpret the Plan, to provide,
         modify and rescind rules and regulations relating to it, to determine
         the terms and provisions of each Option and the form of each option
         agreement evidencing an Option granted under the Plan and to make all
         other


                                      -4-
<PAGE>   5

         determinations and perform such actions as the Committee deems
         necessary or advisable to administer the Plan. In addition, the
         Committee shall have fall authority, subject to the express provisions
         of the Plan, to determine the Employees to whom Options shall be
         granted, the time or date of grant of each such Option, the number of
         shares subject thereto and the price at which such shares may be
         purchased. In making such determinations, the Committee may take into
         account the nature of the services rendered by the Employee, his or her
         present and potential contributions to the success of the Company's
         business and such other facts as the Committee in its discretion shall
         deem appropriate to carry out the purposes of the Plan.

                  (e) No member of the Committee shall be liable for any action
         taken or determination made in good faith with respect to the Plan or
         any Option granted hereunder.

         Section 5. Grant of Options. At any time and from time to time during
the duration of the Plan and subject to the express provisions thereof, Options
may be granted by the Committee to any Employee for such number of shares of
Common Stock as the Committee in its discretion shall deem to be in the best
interest of the Company and which will serve to further the purposes of the
Plan. The Committee, in its discretion, may designate any Option so granted as
an option that shall not be treated as an Incentive Stock Option.

         Section 6. Option Price and Payment. The purchase price per share of
Common Stock under each Option shall be determined by the Committee in its
discretion, but in no event



                                      -5-
<PAGE>   6

shall such price be less than 100% of the Fair Market Value per share of Common
Stock at the time the Option is granted; provided, however, that the purchase
price per share of Common Stock under any Incentive Stock Option granted to an
Optionee who, at the time such Incentive Stock Option is granted, owns stock
possessing more than 10% of the total combined voting power of all classes of
stock of the Company or any Affiliate shall be at least 110% of the Fair Market
Value per share of Common Stock at the date of grant. Upon exercise of an
Option, the purchase price shall be paid in full in cash or, if and to the
extent provided for under the option agreement for such Option, in cash and/or
by delivery of shares of Common Stock already owned by the Optionee having an
aggregate Fair Market Value (determined as of the date of exercise) equal to the
purchase price, including an actual or deemed multiple series of exchanges of
such shares. The proceeds of such sale shall constitute general funds of the
Company. Upon exercise of an option, the Optionee will be required to pay to the
Company the amount of any federal, state or local taxes required by law to be
withheld in connection with such exercise.

         Section 7. Option Period and Terms of Exercise of Options. Except as
otherwise provided for herein, each Option granted under the Plan shall be
exercisable during such period commencing on or after the expiration of one year
from the date of the grant of such Option as the Committee shall determine;
provided, however, that the otherwise unexpired portion of any Option shall
expire and become null and void no later than upon the first to occur of (i) the
expiration of ten years from the date such Option was granted, (ii) the
expiration of three months from the date of the termination of the Optionee's
employment with the Company or an Affiliate for any reason other than death or
disability, or (iii) the expiration of one year from the date of the termination
of the Optionee's employment with the Company or an Affiliate by reason of


                                      -6-
<PAGE>   7

death or disability. Anything herein to the contrary notwithstanding, the
otherwise unexpired portion of any Option granted hereunder to an Optionee shall
expire and become null and void immediately upon such Optionee's termination of
employment with the Company or an Affiliate by reason of such Optionee's fraud,
dishonesty or performance of other acts detrimental to the Company or an
Affiliate. Any Incentive Stock Option granted to an Optionee who, at the time
such Incentive Stock Option is granted, owns stock possessing more than 10% of
the total combined voting power of all classes of stock of the Company or any
Affiliate shall not be exercisable after the expiration of five years from the
date of its grant. Under the provisions of any option agreement evidencing an
Option, the Committee may limit the number of shares purchasable thereunder in
any period or periods of time during which the Option is exercisable and may
impose such other terms and conditions upon the exercise of an Option as are not
inconsistent with the terms of this Plan; provided, however, that the Committee,
in its discretion, may accelerate the exercise date of any Option to any date
following the date of grant.

         Section 8. Nontransferability of Options. An Option granted under the
Plan shall be transferable by the Optionee only by will or by the laws of
descent and distribution and shall be exercisable during the lifetime of the
Optionee only by the Optionee, or if the Optionee is legally incompetent, by the
Optionee's legal representative.

         Section 9. Termination of Employment. Transfers of employment between
the Company and any of its Affiliates shall not be considered to be a
termination of employment for the purposes of this Plan. Nothing in the Plan or
in any option agreement evidencing an Option shall confer upon any Optionee any
right to continue in the employ of the Company or any


                                      -7-
<PAGE>   8

Affiliate or in any way interfere with the right of the Company or any Affiliate
to terminate the employment of the Optionee at any time, with or without cause.

         Section 10. Adjustments Upon Changes in Common Stock. In the event the
Company shall effect a split of Common Stock or dividend payable in Common
Stock, or in the event the outstanding Common Stock shall be combined into a
smaller number of shares, the maximum number of shares as to which Options may
be granted under the Plan and the per-person limit on Option grants set forth in
Section 3 hereof shall be decreased or increased proportionately. In the event
that, before delivery by the Company of all of the shares of Common Stock in
respect of which an Option has been granted under the Plan, the Company shall
have effected such a split, dividend or combination, the shares still subject to
such Option shall be increased or decreased proportionately and the purchase
price per share shall be decreased or increased proportionately so that the
aggregate purchase price for all of the then-optioned shares shall remain the
same as immediately prior to such split, dividend or combination.

         In the event of a reclassification of Common Stock not covered by the
foregoing, or in the event of a liquidation or reorganization (including a
merger, consolidation, spinoff or sale of assets) of the Company or an
Affiliate, the Committee shall make such adjustments, if any, as it may deem
appropriate in the number, purchase price and kind of shares covered by the
unexercised portions of Options theretofore granted under the Plan. The
provisions of this Section shall only be applicable if, and only to the extent
that, the application thereof does not conflict with any valid governmental
statute, regulation or rule.



                                      -8-
<PAGE>   9

         Section 11. Amendment and Termination of the Plan. Subject to the right
of the Board to terminate the Plan prior thereto, the Plan shall terminate at
the expiration of ten years from April 16, 1992, the date of adoption of the
Plan by the Board. No Options may be granted after the termination of the Plan.
The Board may alter or amend the Plan but may not without the approval of the
shareholders of the Company make any alteration or amendment thereof which
operates (i) to abolish the Committee, change the qualifications of its members
or withdraw the administration of the Plan from the Committee's supervision,
(ii) to increase the total number of shares of Common Stock which may be granted
under the Plan (other than as provided in Section 10 hereof), (iii) to extend
the term of the Plan or the maximum exercise period provided in Section 7
hereof, (iv) to decrease the minimum purchase price provided in Section 6 hereof
(other than as provided in Section 10 hereof) or (v) to materially modify the
requirements as to eligibility for participation in the Plan.

         No termination or amendment of the Plan shall adversely affect the
rights of an Optionee under a previously granted Option, except with the consent
of such Optionee.

         Section 12. Modification of Options. Subject to the terms and
conditions of and within the limitations of the Plan, the Committee may modify,
extend or renew outstanding Options granted under the Plan (including the
conversion of an Incentive Stock Option into a nonqualified stock option), or
accept the surrender of Options outstanding hereunder (to the extent not
theretofore exercised) and authorize the granting of new Options in substitution
therefor. Notwithstanding the foregoing, no modification of an Option shall,
without the consent of the Optionee, alter or impair any rights or obligations
under any Option theretofore granted to



                                      -9-
<PAGE>   10

such Optionee, except as may be necessary, with respect to Incentive Stock
Options, to satisfy the requirements of Section 422(b) of the Code.

         Section 13. Requirements of Law. The granting of Options and the
issuance of Common Stock upon the exercise of an Option shall be subject to all
applicable laws, rules and regulations and to such approval by governmental
agencies as may be required.

         Section 14. Investment Letter. The Company's obligation to deliver
Common Stock with respect to an Option shall be conditioned upon the Company's
receipt from the Employee to whom such Common Stock is to be delivered of an
executed investment letter containing such representations and agreements as the
Committee may determine to be necessary or advisable in order to enable the
Company to issue and deliver such Common Stock to such Employee in compliance
with the Securities Act of 1933, as amended, and other applicable federal, state
or local securities laws or regulations.

         Section 15. Effective Date of the Plan. The Plan shall become
effective, as of the date of its adoption by the Board, when it has been duly
approved by the holders of at least a majority of the shares of Common Stock
present or represented and entitled to vote at a meeting of the shareholders of
the Company duly held in accordance with applicable law within twelve months
after the date of adoption of the Plan by the Board. If the Plan is not so
approved, the Plan shall terminate, and any Option granted hereunder shall be
null and void.

                                      -10-

<PAGE>   1




                                                                      Exhibit 11



                            STATEMENT RE COMPUTATION
                              OF PER SHARE EARNINGS

<TABLE>
<CAPTION>


                                             THREE MONTHS ENDED          SIX MONTHS ENDED
                                                   JUNE 30,                   JUNE 30,
                                           ----------------------   -----------------------
                                              1999         1998         1999         1998
                                           ----------   ----------   ----------   ----------
<S>                                        <C>           <C>         <C>          <C>
Numerator:
   Net income for basic and
     diluted earnings per share            $  444,000    1,063,000   $  902,000   $1,366,000
                                           ----------   ----------   ----------   ----------


Denominator:
   Denominator for basic earnings
     per common share -
     weighted-average shares                3,979,367    3,970,113    3,978,284    3,962,199

   Effect of dilutive securities:
     Employee stock options                     9,662       18,342        8,216        9,227
                                           ----------   ----------   ----------   ----------

   Denominator for diluted earnings
     per common share -
     weighted-average shares                3,989,029    3,988,455    3,986,500    3,971,426
                                           ==========   ==========   ==========   ==========


Basic earnings per common share            $     0.11   $     0.27   $     0.23   $     0.34
                                           ==========   ==========   ==========   ==========

Diluted earnings per common share          $     0.11   $     0.27   $     0.23   $     0.34
                                           ==========   ==========   ==========   ==========
</TABLE>



<TABLE> <S> <C>

<ARTICLE> 5
<MULTIPLIER> 1,000

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<CASH>                                           7,977
<SECURITIES>                                         0
<RECEIVABLES>                                    4,242
<ALLOWANCES>                                         0
<INVENTORY>                                      3,739
<CURRENT-ASSETS>                                16,065
<PP&E>                                          76,273
<DEPRECIATION>                                (34,151)
<TOTAL-ASSETS>                                  61,582
<CURRENT-LIABILITIES>                            4,586
<BONDS>                                              0
                                0
                                          0
<COMMON>                                           529
<OTHER-SE>                                      26,838
<TOTAL-LIABILITY-AND-EQUITY>                    61,582
<SALES>                                         14,544
<TOTAL-REVENUES>                                14,544
<CGS>                                           10,635
<TOTAL-COSTS>                                   10,635
<OTHER-EXPENSES>                                 1,805
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               1,034
<INCOME-PRETAX>                                  1,203
<INCOME-TAX>                                       301
<INCOME-CONTINUING>                                902
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                       902
<EPS-BASIC>                                       0.23
<EPS-DILUTED>                                     0.23


</TABLE>


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