HS RESOURCES INC
10-Q, 1999-11-15
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>   1
                       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      September 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      0-18886
                      ----------------------------------------------------------

                               HS RESOURCES, INC .
- --------------------------------------------------------------------------------
             (Exact name of registrant as specified in its charter)

         Delaware                                      94-3036864
- ----------------------------------------     -----------------------------------
(State or other jurisdiction of                     (I.R.S. Employer
incorporation or organization)                     Identification No.)

One Maritime Plaza, Fifteenth Floor
San Francisco, California                                94111
    ------------------------------------     -----------------------------------
(Address of principal executive offices)               (Zip Code)

Registrant's telephone number, including area code       (415) 433-5795
                                                  ------------------------------


- --------------------------------------------------------------------------------
              (Former name, former address and former fiscal year,
                          if changed since last report)

         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
                                              ---    ---

                APPLICABLE ONLY TO ISSUER INVOLVED IN BANKRUPTCY
                  PROCEEDINGS DURING THE PRECEDING FIVE YEARS:

         Indicate by check mark whether the registrant has filed all documents
and reports required to be filed by Sections 12, 13, or 15(d) of the Securities
Exchange Act of 1934 subsequent to the distribution of securities under a plan
confirmed by a court. Yes     No
                          ---    ---

                      APPLICABLE ONLY TO CORPORATE ISSUERS:

Number of shares of Common Stock, $.001 par value, outstanding as of the close
of business on October 31, 1999: 18,797,814 after deducting 729,990 shares in
treasury.


                                       1
<PAGE>   2



                               HS RESOURCES, INC.

                                      INDEX

<TABLE>
<CAPTION>
                                                                                                               Page
                                                                                                               ----
<S>                                                                                                            <C>
PART I.  FINANCIAL INFORMATION

Item 1.  Financial Statements

         Consolidated Financial Statements:

         Consolidated Balance Sheets - September 30, 1999 (Unaudited) and
         December 31, 1998........................................................................................3

         Unaudited Consolidated Statements of Operations - For the Three Months
         and Nine Months Ended September 30, 1999 and 1998........................................................5

         Consolidated Statements of Stockholders' Equity - For the Years Ended
         December 31, 1998 and 1997 and the Nine Months Ended
         September 30, 1999 (Unaudited)...........................................................................6

         Unaudited Consolidated Statements of Cash Flows -
         For the Nine Months Ended September 30, 1999 and 1998....................................................7

         Notes to Unaudited Consolidated Financial Statements.....................................................8

Item 2.  Management's Discussion and Analysis of Financial Condition and
         Results of Operations...................................................................................14

PART II. OTHER INFORMATION

Item 1.  Legal Proceedings & Environmental Issues................................................................34

Item 2.  Changes in Securities...................................................................................35

Item 3.  Defaults Upon Senior Securities.........................................................................35

Item 4.  Submission of Matters to a Vote of Security Holders.....................................................35

Item 5.  Other Information.......................................................................................35

Item 6.  Exhibits and Reports on Form 8-K........................................................................36
</TABLE>



                                       2
<PAGE>   3




                          PART I. FINANCIAL INFORMATION


Item 1.  Financial Statements

                               HS Resources, Inc.
                           Consolidated Balance Sheets
                    September 30, 1999 and December 31, 1998

<TABLE>
<CAPTION>

                                                                                  September 30,
                                                                                      1999            December 31,
                                                                                   (Unaudited)           1998
                                                                                  -------------      -------------
<S>                                                                               <C>                <C>
ASSETS
CURRENT ASSETS
    Cash and cash equivalents                                                     $   3,943,280      $   9,658,697
    Margin deposits                                                                   3,246,104            621,765
    Accounts receivable
         Oil and gas sales                                                           30,219,095         20,528,042
         Trading and transportation                                                  21,007,991         14,011,992
         Trade                                                                        4,620,992          4,079,887
         Other                                                                       10,220,560          8,276,930
    Lease and well equipment inventory, at cost                                         874,047            709,985
    Prepaid expenses and other                                                        1,877,042          2,378,092
    Notes receivable from officers for exercise of stock options (Note 6)             1,543,534                 --
                                                                                  -------------      -------------
         Total current assets                                                        77,552,645         60,265,390
                                                                                  -------------      -------------

OIL AND GAS PROPERTIES, AT COST, USING THE SUCCESSFUL EFFORTS METHOD
    Undeveloped acreage                                                             108,145,495        108,029,622
    Costs subject to depreciation, depletion and amortization                       859,797,727        816,633,609
    Less accumulated depreciation, depletion and amortization                      (214,298,144)      (175,729,105)
                                                                                  -------------      -------------
         Net oil and gas properties                                                 753,645,078        748,934,126
                                                                                  -------------      -------------

GAS GATHERING AND TRANSPORTATION FACILITIES,
    at cost, net of accumulated depreciation of $1,844,552
    and $1,616,576 at September 30, 1999 and December 31, 1998, respectively          4,506,529          4,274,544
                                                                                  -------------      -------------
WORKOVER RIGS AND OTHER EQUIPMENT,
    at cost, net of accumulated depreciation of $21,392
         at September 30, 1999                                                          840,821                 --
                                                                                  -------------      -------------
OTHER ASSETS
    Deferred charges and other, net                                                   9,511,381         11,001,725
    Office and transportation equipment and other property,
         net of accumulated depreciation of $6,300,598 and $5,883,372
         at September 30, 1999 and December 31, 1998, respectively                    2,379,506          3,017,825
    Notes receivable from officers for exercise of stock options and issuance
         of common stock (Note 6)                                                       796,511          2,245,813
    Goodwill, net of accumulated amortization of $1,170,000 and $900,000
         at September 30, 1999 and December 31, 1998, respectively                    2,430,000          2,700,000
                                                                                  -------------      -------------
         Total other assets                                                          15,117,398         18,965,363
                                                                                  -------------      -------------
TOTAL ASSETS                                                                      $ 851,662,471      $ 832,439,423
                                                                                  =============      =============
</TABLE>


             The accompanying notes are an integral part of these
                      consolidated financial statements.


                                       3
<PAGE>   4



                               HS Resources, Inc.
                           Consolidated Balance Sheets
                    September 30, 1999 and December 31, 1998

<TABLE>
<CAPTION>
                                                                                  September 30,
                                                                                      1999           December 31,
                                                                                   (Unaudited)           1998
                                                                                  -------------      -------------
<S>                                                                               <C>                <C>
Liabilities and Stockholders' Equity
Current Liabilities
    Accounts payable
        Trade                                                                     $  16,987,525      $  21,408,518
        Revenue                                                                      37,093,248         20,915,255
        Gas purchases                                                                 7,412,050          7,237,935
    Accrued expenses
        Ad valorem and production taxes                                              10,440,289         12,027,297
        Interest                                                                     12,605,989          6,665,508
        Other                                                                         4,493,586          7,381,932
    Income taxes payable                                                                 37,809          2,792,929
    Oil and gas production note payable                                                      --            734,696
                                                                                  -------------      -------------
        Total current liabilities                                                    89,070,496         79,164,070
                                                                                  -------------      -------------
Accrued Ad Valorem Taxes                                                             11,675,346         12,450,721
                                                                                  -------------      -------------
Deferred Revenue                                                                      1,472,554          8,908,363
                                                                                  -------------      -------------
Long-Term Bank Debt                                                                 234,000,000        230,000,000
                                                                                  -------------      -------------
9 7/8% Senior Subordinated Notes,
    due 2003, net of unamortized discount of  $243,750 and $287,625
    at September 30, 1999 and December 31, 1998,  respectively                       74,756,250         74,712,375
                                                                                  -------------      -------------
9 1/4% Series A Senior Subordinated Notes,
    due 2006, net of unamortized discount of $553,612 and $611,887
    at September 30, 1999 and December 31, 1998, respectively                       149,446,388        149,388,113
                                                                                  -------------      -------------
9 1/4% Series B Senior Subordinated Notes,
    due 2006, net of unamortized discount of $3,785,156 and $4,183,594
    at September 30, 1999 and December 31, 1998, respectively                        81,214,844         80,816,406
                                                                                  -------------      -------------
Deferred Income Taxes                                                                49,275,703         44,137,897
                                                                                  -------------      -------------
Commitments and Contingencies
Stockholders' Equity
    Preferred stock                                                                          --                 --
    Common stock, $.001 par value, 50,000,000 shares authorized;
        19,527,804 and 19,126,820 shares issued and outstanding
        at September 30, 1999 and December 31, 1998, respectively                        19,528             19,127
    Additional paid-in capital                                                      191,121,160        188,195,831
    Retained deficit                                                                (20,954,414)       (25,988,247)
    Deferred compensation                                                            (2,200,461)        (1,749,256)
    Treasury stock, at cost, 729,356 and 801,200 shares at September 30, 1999
        and December 31, 1998, respectively                                          (7,234,923)        (7,615,977)
                                                                                  -------------      -------------
        Total stockholders' equity                                                  160,750,890        152,861,478
                                                                                  -------------      -------------
Total Liabilities and Stockholders' Equity                                        $ 851,662,471      $ 832,439,423
                                                                                  =============      =============
</TABLE>


             The accompanying notes are an integral part of these
                      consolidated financial statements.

                                       4
<PAGE>   5



                               HS Resources, Inc.
                      Consolidated Statements of Operations
     For the Three Months and Nine Months Ended September 30, 1999 and 1998
                                   (Unaudited)

<TABLE>
<CAPTION>
                                                         Three Months Ended                     Nine Months Ended
                                                            September 30,                         September 30,
                                                  --------------------------------      --------------------------------
                                                       1999               1998               1999               1998
                                                  -------------      -------------      -------------      -------------
<S>                                               <C>                <C>                <C>                <C>
REVENUES
     Oil and gas sales                            $  43,473,195      $  32,886,639      $ 116,280,737      $ 116,598,918
     Trading and transportation                      11,595,814         13,831,014         32,873,914         41,297,363
     Other gas revenues                               2,280,765          2,068,422          7,322,747          6,213,597
     Interest income and other                          141,025            504,203            410,867          1,147,179
                                                  -------------      -------------      -------------      -------------
         Total revenues                              57,490,799         49,290,278        156,888,265        165,257,057
                                                  -------------      -------------      -------------      -------------
EXPENSES
     Production taxes                                 3,371,829          2,068,382          7,656,472          7,825,088
     Lease operating                                  6,775,850          7,798,458         20,936,348         23,112,543
     Cost of trading and transportation              10,996,241         12,549,802         31,441,918         38,910,181
     Depreciation, depletion and amortization        13,069,971         15,387,360         40,471,725         47,319,976
     Exploratory and abandonment                      4,358,552          1,335,325          9,097,872          3,008,098
     Geological and geophysical                       1,293,161          3,411,793          4,780,200         11,241,214
     Impairment and (gain)/loss on
         sales of oil and gas properties             (2,327,765)         6,742,393         (1,227,652)         6,669,722
     General and administrative                       1,467,233          2,247,918          3,942,160          6,238,365
     Interest                                        10,717,362         10,888,574         31,657,020         32,740,649
                                                  -------------      -------------      -------------      -------------
         Total expenses                              49,722,434         62,430,005        148,756,063        177,065,836
                                                  -------------      -------------      -------------      -------------
INCOME (LOSS) BEFORE PROVISION (BENEFIT)
     FOR INCOME TAXES                                 7,768,365        (13,139,727)         8,132,202        (11,808,779)
PROVISION (BENEFIT) FOR INCOME TAXES                  2,959,747         (5,006,236)         3,098,369         (4,499,145)
                                                  -------------      -------------      -------------      -------------
NET INCOME (LOSS)                                 $   4,808,618      $  (8,133,491)     $   5,033,833      $  (7,309,634)
                                                  =============      =============      =============      =============
BASIC EARNINGS (LOSS) PER SHARE                   $        0.26      $       (0.43)     $        0.27      $       (0.39)
                                                  =============      =============      =============      =============
DILUTED EARNINGS (LOSS) PER SHARE                 $        0.25      $       (0.43)     $        0.27      $       (0.39)
                                                  =============      =============      =============      =============
WEIGHTED AVERAGE NUMBER OF COMMON SHARES
     OUTSTANDING                                     18,798,000         18,796,000         18,664,000         18,619,000
                                                  =============      =============      =============      =============
WEIGHTED AVERAGE NUMBER OF COMMON SHARES
     OUTSTANDING ASSUMING DILUTION                   19,131,000         18,796,000         18,815,000         18,619,000
                                                  =============      =============      =============      =============
</TABLE>


             The accompanying notes are an integral part of these
                      consolidated financial statements.


                                       5
<PAGE>   6



                               HS Resources, Inc.
                 Consolidated Statements of Stockholders' Equity
                 For the Years Ended December 31, 1998 and 1997
                  and the Nine Months Ended September 30, 1999


<TABLE>
<CAPTION>
                                              Common Stock        Additional     Retained                        Treasury Stock
                                           -------------------     Paid-In       Earnings       Deferred     ----------------------
                                             Shares     Amount     Capital       (Deficit)    Compensation    Shares      Amount
                                           ----------  -------   ------------   ------------  ------------   --------   -----------
<S>                                        <C>         <C>       <C>            <C>            <C>           <C>        <C>
Balance, December 31, 1996                 17,127,861  $17,128   $163,114,868   $  8,133,368   $  (171,300)  (121,952)  $(1,670,534)
    Purchase of treasury stock                     --       --             --             --            --   (101,247)   (1,398,669)
    Transfer of treasury stock
        to 401(k) Plan                             --       --        (68,011)            --            --     35,894       485,287
    Issuance of common stock for
        Amoco Acquisition                   1,200,000    1,200     19,998,800             --            --         --            --
    Issuance of treasury stock for
        exercise of options including
        income tax benefit                         --       --        (34,355)            --            --     26,947       367,375
    Issuance of restricted stock                2,500        3         44,997             --       (45,000)        --            --
    Amortization of deferred
        compensation                               --       --             --             --        72,000         --            --
    Issuance of common stock                   12,203       12        135,393             --            --         --            --
    Exercise of warrants and options          311,981      312           (312)            --            --         --            --
    Net loss                                       --       --             --    (15,505,158)           --         --            --
                                           ----------  -------   ------------   ------------   -----------   --------   -----------
Balance, December 31, 1997                 18,654,545   18,655    183,191,380     (7,371,790)     (144,300)  (160,358)   (2,216,541)
    Purchase of treasury stock                     --       --             --             --            --   (721,937)   (6,524,268)
    Transfer of treasury stock
        to 401(k) Plan                             --       --          7,419             --            --     39,046       541,568
    Issuance of treasury stock for
        exercise of options including
        income tax benefit                         --       --       (115,247)            --            --     42,049       583,264
    Issuance of restricted stock               32,126       33        427,685             --      (427,718)        --            --
    Amortization of deferred
        compensation                               --       --             --             --       306,547         --            --
    Issuance of performance shares            106,234      106      1,533,913             --    (1,534,019)        --            --
    Exercise of stock options, including
        income tax benefit                    337,021      336      3,200,912             --            --         --            --
    Restricted stock forfeited                 (3,106)      (3)       (50,231)            --        50,234         --            --
    Net loss                                       --       --             --    (18,616,457)           --         --            --
                                           ----------  -------   ------------   ------------   -----------   --------   -----------
Balance, December 31, 1998                 19,126,820   19,127    188,195,831    (25,988,247)   (1,749,256)  (801,200)   (7,615,977)
    Transfer of treasury stock
        to 401(k) Plan                             --       --         50,737             --            --     74,889       712,194
    Issuance of common stock                  235,000      235      1,369,765             --            --         --            --
    Amortization of deferred
        compensation                               --       --             --             --       848,493         --            --
    Issuance of performance shares            132,000      132        997,788             --      (997,920)        --            --
    Issuance of restricted stock               33,984       34        301,744             --      (301,778)        --            --
    Purchase of treasury stock                     --       --             --             --            --    (48,660)     (766,515)
    Issuance of treasury stock for
        exercise of options including
        income tax benefit                         --       --        205,295             --            --     45,615       435,375
    Net income                                     --       --             --      5,033,833            --         --            --
                                           ----------  -------   ------------   ------------   -----------   --------   -----------
Balance, September 30, 1999 (Unaudited)    19,527,804  $19,528   $191,121,160   $(20,954,414)  $(2,200,461)  (729,356)  $(7,234,923)
                                           ==========  =======   ============   ============   ===========   ========   ===========
</TABLE>


             The accompanying notes are an integral part of these
                      consolidated financial statements.


                                       6
<PAGE>   7



                               HS Resources, Inc.
                      Consolidated Statements of Cash Flows
              For the Nine Months Ended September 30, 1999 and 1998
                                   (Unaudited)


<TABLE>
<CAPTION>
                                                                         September 30,
                                                                 ------------------------------
                                                                      1999             1998
                                                                 -------------    -------------
<S>                                                              <C>              <C>
CASH FLOWS FROM OPERATING ACTIVITIES
     Net income (loss)                                           $   5,033,833    $  (7,309,634)

     Adjustments to reconcile net income to net cash
             provided by operating activities
          Depreciation, depletion and amortization                  40,471,725       47,319,976
          Impairment and (gain)/loss on sales
             of oil and gas properties                              (1,227,652)       6,669,722
          Surrendered and expired acreage                            2,959,862               --
          Amortization of deferred charges, debt issue costs
             and deferred compensation                               3,307,635        1,848,398
          Transfer of treasury stock to 401(k) Plan                    762,931          548,987
          Gain on sale of fixed assets                                      --         (239,349)
          Deferred income tax provision (benefit)                    3,037,806       (4,635,194)
          (Increase) decrease in accounts and notes receivable     (19,171,787)       3,907,934
          Increase in accounts payable
             and accrued expenses                                   17,458,355        3,740,815
          Decrease in deferred revenue, net                         (7,435,809)      (4,378,936)
          Other                                                     (2,913,713)          26,434
                                                                 -------------    -------------
     Net cash provided by operating activities                      42,283,186       47,499,153
                                                                 -------------    -------------
CASH FLOWS FROM INVESTING ACTIVITIES
     Exploration, development and leasehold costs                  (48,855,904)     (79,761,623)
     Purchase of unproved and proved properties                             --       (4,636,960)
     Purchase of workover rigs and equipment                          (862,213)              --
     Gas gathering and transportation facilities additions            (459,961)         (27,932)
     Other property additions                                         (285,483)        (519,063)
     Net proceeds from the sale of oil and gas properties            3,384,187      152,524,727
     Proceeds from the sale of fixed assets and other property              --        1,231,447
     (Decrease) increase in property related payables               (6,227,304)       6,633,012
                                                                 -------------    -------------
     Net cash (used in) provided by  investing activities          (53,306,678)      75,443,608
                                                                 -------------    -------------
CASH FLOWS FROM FINANCING ACTIVITIES
     Proceeds from debt                                             52,000,000       55,000,000
     Repayments of debt                                            (48,000,000)    (174,000,000)
     Issuance of common stock                                          610,625               --
     Exercise of options                                               640,670          468,338
     Purchase of treasury stock                                       (766,515)      (4,506,135)
     Payment of officer note and interest                              823,295               --
                                                                 -------------    -------------
     Net cash provided by (used in) financing activities             5,308,075     (123,037,797)
                                                                 -------------    -------------
NET DECREASE IN CASH AND CASH EQUIVALENTS                           (5,715,417)         (95,036)
     Cash and cash equivalents, beginning of period                  9,658,697        6,907,708
                                                                 -------------    -------------
     Cash and cash equivalents, end of period                    $   3,943,280    $   6,812,672
                                                                 =============    =============
SUPPLEMENTAL CASH FLOW DISCLOSURE
     Interest paid, net of capitalized interest                  $  23,215,839    $  22,104,251
     Cash paid for income taxes, net of reimbursements           $     729,384    $     611,758
                                                                 =============    =============
</TABLE>


             The accompanying notes are an integral part of these
                      consolidated financial statements.


                                       7
<PAGE>   8



                               HS RESOURCES, INC.
              NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS


Note 1.    General

         HS Resources, Inc. (the "Company" or "HSR"), a Delaware corporation,
was organized in January 1987. The Company, directly or through subsidiaries,
acquires, develops and exploits oil and gas properties. The Company's properties
are primarily located in the Denver-Julesburg ("D-J") Basin, the onshore area of
the Texas-Louisiana Gulf Coast and to a lesser extent the Northern Rocky
Mountains. The Company, through its wholly owned subsidiary, HS Energy Services,
Inc. ("HSES"), markets its own gas production, markets gas owned by third
parties and actively trades both physical and financial positions in the gas
commodities market. The interim financial data are unaudited; however, all
adjustments (which are of a normal and recurring nature) have been made which
are, in the opinion of management, necessary for a fair statement of the
financial position of the Company at September 30, 1999, and its results of
operations and cash flows for the interim periods presented. Because of various
factors, results of operations for these periods are not necessarily indicative
of results to be expected for the full year. For a more complete understanding
of the Company's operations and financial position, these statements should be
read in conjunction with audited financial statements and notes thereto included
in the Company's December 31, 1998 Report on Form 10-K filed with the Securities
and Exchange Commission on March 31, 1999.

Note 2.  Summary of Significant Accounting Policies

FINANCIAL INSTRUMENTS The Company engages in price and location risk management
activities for both hedging and trading purposes. Activities for hedging
purposes are entered into by the Company to manage its exposure to price and
location risks in the marketing of its oil and gas production and, in the case
of its marketing activities, third party gas. Gains and losses on hedging
positions are deferred and recognized as "oil and gas sales" (for company-owned
production) and "trading and transportation revenues" (for third party gas) in
the period during which the underlying physical transactions occur. Activities
for trading purposes are accounted for using the mark-to-market method. Under
this method, changes in the market value of outstanding financial instruments
are recognized as a gain or loss in the period of change on a net basis in
"trading and transportation revenues." The market prices used to value these
transactions reflect management's best estimate considering various factors
including closing exchange and over-the-counter quotations, time value and
volatility factors underlying the commitments. The values are adjusted to
reflect the potential impact of liquidating the Company's position in an orderly
manner over a reasonable period of time under present market conditions. In the
event energy related financial instruments are terminated prior to the period of
physical delivery of the items being hedged, the gains or losses on the energy
related financial instruments at the time of the termination



                                       8
<PAGE>   9

remain deferred until the period of physical delivery unless both the energy
related financial instruments and the items being hedged result in a loss. If
this occurs, the loss is recorded immediately.

EARNINGS PER SHARE In February 1997, the Financial Accounting Standards Board
issued SFAS No. 128, "Earnings Per Share." This statement provides computation,
presentation and disclosure requirements for earnings per share ("EPS"). The new
standard was adopted by the Company for the fiscal year ended 1997 and all prior
periods have been retroactively adjusted. In the quarter and nine months ended
September 30, 1999, the dilutive impact was 333,000 and 151,000 shares,
respectively. There was no dilutive impact to weighted average shares for the
quarter and nine months ended September 30, 1998.

Note 3.  Pro forma Statements

The following table sets forth condensed unaudited pro forma operating results
of the Company for the nine months ended September 30, 1999 and 1998. The
condensed pro forma operating results assume the divestiture of the Company's
Mid-Continent oil and gas subsidiary, HSRTW, Inc., to Universal Resources Corp.,
occurred on January 1, 1998. The condensed pro forma results are not necessarily
indicative of the results of operations had the divestiture been consummated on
January 1, 1998, and may not necessarily be indicative of future performance.
The September 30, 1999 amounts reflect the actual activity for the nine months
then ended. Amounts in thousands, except per share amounts.

<TABLE>
<CAPTION>
                               Nine Months Ended September 30,
                               -------------------------------
                                         (Unaudited)
                                      1999         1998
                                    --------     --------
<S>                                 <C>          <C>
Revenues                            $156,888     $147,614
Net income                          $  5,034     $    823
Basic earnings per share            $   0.27     $   0.04
Diluted earnings per share          $   0.27     $   0.04
Weighted average number of
      common shares outstanding       18,664       18,619
Weighted average number of
      common shares outstanding
      assuming dilution               18,815       18,706
</TABLE>



                                       9
<PAGE>   10




Note 4.  Issuance of Performance Shares

In May 1998, the Company's stockholders approved amendments to the Amended and
Restated 1997 Performance and Equity Incentive Plan (the "Plan"). The Plan
allows for the issuance of performance shares to employees, officers and
directors. Accelerated vesting of such shares is dependent on the attainment by
the Company of defined performance goals. These shares have a base vesting
schedule over nine years with accelerated vesting to occur no earlier than
one-fourth of the shares in each of the first four years. In 1998, the Company
issued 106,234 performance shares. In connection with this issuance, the Company
recorded deferred compensation of $1.5 million which is being amortized based on
management's evaluation regarding the attainment of the defined performance
goals. In April 1999, following the Company's change to successful efforts
accounting, the earnings measure for determining return on equity as originally
stated in the 1998 amendments to the Plan was changed to allow that value
measure to operate as originally intended. Following that change, the Board of
Directors determined that the 1998 value measures applicable to the performance
shares issued in 1998 were fully met. As a result, one fourth of these
performance shares have now vested. Additional amortization expense of
approximately $200,000 was recorded in the first quarter of 1999 related to the
vesting of these shares. In the second quarter of 1999, the Company issued
132,000 performance shares and recorded deferred compensation of approximately
$1.0 million.

Through the first nine months of 1999, the Company has amortized deferred
compensation for all performance shares issued assuming achievement of defined
performance goals.

Note 5.  Accounting for Derivative Instruments and Hedging Activities

In June 1998, the Financial Accounting Standards Board issued SFAS No. 133,
"Accounting for Derivative Instruments and Hedging Activities" ("SFAS 133"). The
date of this statement was recently extended and is now effective for fiscal
years beginning after June 15, 2000. This statement establishes accounting and
reporting standards requiring that every derivative instrument (including
certain derivative instruments embedded in other contracts) be recorded in the
balance sheet as either an asset or liability measured at its fair value. The
statement requires that changes in the derivative's fair value be recognized
currently in earnings unless specific hedge accounting criteria are met. Special
accounting for qualifying hedges allows a derivative's gains and losses to
offset related results on the hedged item in the statement of operations, and
requires that a company must formally document, designate and assess the
effectiveness of transactions that receive hedge accounting.

The Company has not yet quantified the impact of adopting SFAS 133 on its
financial statements and has not determined the timing of or method of adoption.
However, SFAS 133 could increase volatility in earnings and other comprehensive
income.



                                       10
<PAGE>   11

In December 1998, the Emerging Issues Task Force reached consensus on Issue No.
98-10, "Accounting for Contracts Involved in Energy Trading and Risk Management
Activities" ("EITF Issue 98-10"). In accordance with EITF Issue 98-10 the
Company records energy trading contracts at fair value on the balance sheet,
with the changes in fair value included in earnings.

Note 6.  Related Party Transactions

In February 1999, the Company instituted the 1999 Non-Compensatory Stock
Purchase Plan. This plan is designed to enable officers of the Company to
purchase stock at fair market value in transactions exempt from Section 16(b) of
the Securities Exchange Act of 1934. Five hundred thousand shares of common
stock have been allocated to the plan. The plan is administered by the
Compensation Committee of the Board of Directors. As of September 30, 1999,
235,000 shares of common stock had been purchased at prices ranging from $5.625
to $6.50. In connection with the stock purchases, 76,000 shares were purchased
for cash. The remaining shares were purchased with the officers paying 15% of
the purchase price in cash, and the remainder in the form of full recourse
promissory notes maturing in two years from the date of issuance.
The notes bear interest at the annual rate of 8.5%.

In June 1998, in connection with the exercise of stock options, certain officers
of the Company issued to the Company full recourse notes in the amount of $2.1
million. The notes and accrued interest are due and payable to the Company on or
before June 1, 2000. The interest rate on these notes is prime plus 0.25% per
annum. The prime rate as of September 30, 1999 was 8.25%. In the third quarter
of 1999, principal and accrued interest in the amount of $823,295 was repaid.

Note 7.  Total Return Equity Swap

In 1999 the Company entered into two total return equity swap agreements with a
financial institution. Under the terms of the first agreement, entered into on
February 25, 1999, the financial institution acquired approximately 730,000
shares of HSR's common stock from another investor at a price of $6.0625. The
Company has the right, but not the obligation, to purchase the stock at a price
of $6.0625 per share at any time through July 1, 2000.

On May 24, 1999 the Company entered into a second agreement whereby the
financial institution acquired 100,000 shares of HSR's common stock at a price
of $11.9875. The Company has the right, but not the obligation, to purchase the
stock at a price of $11.9875 per share at any time through January 5, 2001.

If the Company decides not to purchase the shares on or before the termination
of either agreement, the Company will receive any increase in the market value
of the shares covered by that agreement above the purchase price of the shares,
or will pay for any loss; however, the Company may cover any losses by issuing
common stock to the financial




                                       11
<PAGE>   12

institution if it chooses to do so. All such amounts will be reflected in
stockholders' equity at the time of settlement. The Company will also pay
certain commissions and finance costs. At September 30, 1999 the aggregate fair
market value of the Company's common stock in excess of the underlying option
price attributable to such shares was approximately $8.0 million.



                                       12
<PAGE>   13



Note 8.  Business Segment Information (in thousands)

The Company is an independent energy company engaged in the following
activities:

o        acquisition, development, exploitation, exploration and production of
         oil and gas

o        marketing of oil and gas



<TABLE>
<CAPTION>
                                                           Three Months Ended            Nine Months Ended
                                                              September 30,                September 30,
                                                        ------------------------      ------------------------
                                                          1999            1998           1999          1998
                                                        ---------      ---------      ---------      ---------
<S>                                                     <C>            <C>            <C>            <C>
OPERATING REVENUES:
     Oil and gas sales D-J Basin                        $  39,423      $  30,900      $ 110,682      $ 103,686
     Oil and gas sales Gulf Coast                           6,282            286         12,754          1,471
     Oil and gas sales Mid-Continent and other                 49          3,769            167         17,655
     Trading and transportation                            47,800         35,297        117,812        109,155
     Intersegment eliminations                            (36,205)       (21,466)       (84,938)       (67,857)
                                                        ---------      ---------      ---------      ---------
                                                        $  57,349      $  48,786      $ 156,477      $ 164,110
                                                        =========      =========      =========      =========
OPERATING INCOME (LOSS):
     D-J Basin                                          $  17,938      $   9,784      $  45,329      $  40,101
     Gulf Coast                                              (204)        (3,718)        (2,392)       (10,654)
     Mid-Continent and other                                1,826         (7,379)           145         (4,306)
     Trading and transportation                             1,138          1,689          3,107          3,945
     Intersegment eliminations                               (647)          (507)        (1,999)        (1,859)
                                                        ---------      ---------      ---------      ---------
OPERATING INCOME                                           20,051           (131)        44,190         27,227
     Other income and expense                             (12,283)       (13,009)       (36,058)       (39,036)
                                                        ---------      ---------      ---------      ---------
INCOME (LOSS) BEFORE INCOME TAXES                       $   7,768      $ (13,140)     $   8,132      $ (11,809)
                                                        =========      =========      =========      =========
IDENTIFIABLE ASSETS (AT SEPTEMBER 30):
     Oil and gas properties D-J Basin                   $ 939,412      $ 891,323      $ 939,412      $ 891,323
     Oil and gas properties Gulf Coast                     30,333         23,595         30,333         23,595
     Oil and gas properties Mid-Continent and other         5,411         11,261          5,411         11,261
     Trading and transportation                             3,843          3,735          3,843          3,735
     Corporate                                              8,438          8,427          8,438          8,427
                                                        ---------      ---------      ---------      ---------
                                                        $ 987,437      $ 938,341      $ 987,437      $ 938,341
                                                        =========      =========      =========      =========
DEPRECIATION, DEPLETION AND AMORTIZATION EXPENSE:
     Oil and gas properties D-J Basin                   $  11,835      $  12,875      $  37,121      $  37,559
     Oil and gas properties Gulf Coast                        879             68          2,134            324
     Oil and gas properties Mid-Continent and other             8          1,969             23          7,931
     Trading and transportation                               108            100            324            302
     Corporate                                                240            376            870          1,204
                                                        ---------      ---------      ---------      ---------
                                                        $  13,070      $  15,388      $  40,472      $  47,320
                                                        =========      =========      =========      =========
CAPITAL EXPENDITURES AND ACQUISITIONS:
     Oil and gas properties D-J Basin                   $  15,778      $  16,021      $  37,240      $  58,724
     Oil and gas properties Gulf Coast                      3,409          3,994         11,214         10,134
     Oil and gas properties Mid-Continent and other           630          3,956          1,724         15,569
     Trading and transportation                                 2             --             56             --
     Corporate                                                 50             (5)           229            519
                                                        ---------      ---------      ---------      ---------
                                                        $  19,869      $  23,966      $  50,463      $  84,946
                                                        =========      =========      =========      =========
</TABLE>




                                       13
<PAGE>   14



Item 2. Management's Discussion and Analysis of Financial Condition and Results
of Operations

GENERAL We have pursued a strategy centered around consolidation in the
Denver-Julesburg ("D-J") Basin, coupled with continued exploitation and
exploration in our core areas. We use a technology-oriented approach to
exploitation and exploration designed to reduce risk and maximize efficiencies.
Our success in consolidating in the D-J Basin culminated in the December 1997
acquisition of all of Amoco Production Company's D-J Basin properties. This
transaction has also helped reshape our strategic direction, including in
particular, the September 1998 sale of our wholly-owned subsidiary, HSRTW, Inc.,
to Universal Resources Corp., a subsidiary of Questar Corp., for $157.5 million.
HSRTW, Inc. held the majority of our Mid-Continent assets.

Through the Amoco acquisition and related consolidation in the D-J Basin,
coupled with our exploration successes in the Gulf Coast, we have materially
increased our available low-risk, high-return projects. However, to complete the
Amoco acquisition we were required to borrow funds, which significantly
increased our leverage ratios. To partially reduce this increase in debt we sold
the majority of our Mid-Continent asset base and utilized the proceeds to pay
down debt under our senior credit facility. See "Liquidity and Capital Resources
- -- Financing Sources."

Following the Mid-Continent sale, we now operate primarily in three core areas:
the D-J Basin, the Gulf Coast and, to a lesser extent, the Northern Rockies. As
of September 30, 1999, approximately 91% of our production (on an energy
equivalent basis) came from the D-J Basin and 9% from the Gulf Coast. We will
continue to pursue certain technology-oriented exploration projects and other
activities in other regions, including the Mid-Continent. We will also continue
our strategically important and profitable presence in the gas marketing,
trading and transportation business through our wholly-owned subsidiary, HS
Energy Services, Inc. ("HSES"). HSES provides opportunities for us to enhance
our operating margins on gas production from each of our producing areas and
from production we market on behalf of other oil and gas producers.

OIL AND GAS PRICES Profitability in the United States oil and gas industry
fluctuates widely due in part to fluctuating commodity prices and related
changes in rates of reinvestment by industry participants. In 1998 and early
1999, United States natural gas prices and international crude oil prices were
very low, resulting in significant reductions in the operating and financial
margins of oil and gas producers. The downturn in oil prices was attributable to
a global oversupply of crude oil resulting from the economic difficulties in
Asia, Russia and elsewhere, high levels of production by certain OPEC and
non-OPEC producers and warm weather in the United States. Gas prices were also
low primarily due to above-normal winter temperatures in both 1997 and 1998,
resulting in excess supplies of gas in winter storage. Additionally, low oil
prices have had a depressing effect on the price of liquids recovered from
natural gas. Thus, the early 1999 low oil price environment further diminished
the overall price received for our gas production. As a result of



                                       14
<PAGE>   15


these factors, the weighted average price we realized per barrel of oil,
excluding hedging benefits, for the three months ended March 31, 1999 was $11.43
compared to $14.77 for the comparable period in 1998. Natural gas prices per
Mcf, excluding hedging benefits, were $1.68 for the three months ended March
31,1999, compared to $2.16 in the comparable period in 1998. In April 1999, both
oil and gas prices began to recover, particularly compared to the prior year
when prices were declining, resulting in HSR realizing an average price per
barrel of oil, excluding hedging effects, for the three months ended September
30, 1999 of $20.14 compared to $12.29 for the comparable period in 1998. Natural
gas prices per Mcf, excluding hedging benefits, were $2.42 for the three months
ended September 30, 1999 compared to $1.64 in the comparable period in 1998.

At December 31, 1998, approximately 82% of our proved producing reserves
consisted of gas, of which 98% were located in the D-J Basin. The absolute level
and volatility of gas prices, particularly in the D-J Basin, have a material
impact on HSR. Historically, the price of D-J Basin gas (on a Btu-equivalent
basis) has been linked closely to the Colorado Interstate Gas Company ("CIG")
pipeline Rocky Mountain Index, which remains the case during the lower demand
summer months (generally April through October). More recently, however, as a
result of increased pipeline capacity in the D-J Basin, a transportation cost
advantage for deliveries into the Public Service Company of Colorado ("PSCO")
Front Range market, and seasonal fluctuations, the price more closely tracks
Mid-Continent indices during the higher demand winter periods (generally
November through March).

PSCO and CIG, through a jointly owned affiliate, recently began operating a
newly expanded 270 MMcfd capacity line between the Colorado Front Range market
area and Wyoming. This line operates independently and not as part of PSCO's
local distribution system. Additionally, a subsidiary of KN Energy, Inc. (now
Kinder Morgan, Inc.) ("KN") has been granted authority to build a 250 MMcfd
capacity pipeline. Construction has not commenced on the KN line, and it is
uncertain whether this line will be built in the near future. The PSCO line is
expected to eliminate some portion of the advantage HSR currently has over
Wyoming producers for direct sales in the Colorado Front Range market, as it
increases the amount of Wyoming gas that could be transported to the Colorado
Front Range market. However, the availability of one or both of these lines also
expands the amount of gas that could be exported from the D-J Basin to
Mid-Continent and West Coast markets through Wyoming pipeline interconnections.
To date, the increased export capacity from the D-J Basin on the PSCO line,
combined with increased demand from and transportation to West Coast markets out
of Wyoming, have strengthened the overall market for D-J Basin gas compared to
several years ago. Given the narrowing of the spread between CIG and
Mid-Continent indices, we do not anticipate any material adverse changes to D-J
Basin gas prices as a result of the new pipelines.

In recent months, gas prices both in the D-J Basin and nationwide have generally
recovered from the lows experienced this past winter. However, we cannot predict


                                       15
<PAGE>   16

future trends in gas prices. The uncertainty concerning the price of oil and gas
remains a dominant and unpredictable factor in our profitability.

RESULTS OF OPERATIONS During 1999 we continued our drilling and development
activities to exploit the larger number of development opportunities in the D-J
Basin resulting from the Amoco acquisition. We also continued our exploitation
and exploration activities in the Gulf Coast region. At September 30, 1999 we
owned interests in more than 3,890 producing wells (of which we operated more
than 2,820) compared to approximately 4,400 wells (of which we operated more
than 2,880) at September 30, 1998. The decline in well count results primarily
from our sale of properties to Southwestern Eagle and our property trade with
Patina. Our results of operations have been significantly affected by the Amoco
acquisition, by our drilling program and by fluctuations in oil and gas prices.
Future results will be significantly affected by our exploration, exploitation
and development activities.

Comparative operating results by business segment, consolidated other income,
expenses and income taxes are presented below. Segment operating revenues, costs
and expenses are before intersegment eliminations.



                                       16
<PAGE>   17





COMPARISON OF THREE MONTHS AND NINE MONTHS ENDED SEPTEMBER 30, 1999 AND  1998

D-J BASIN
OIL AND GAS SALES (IN THOUSANDS EXCEPT AVERAGE PRICES)




<TABLE>
<CAPTION>
                                               Three Months Ended           Nine Months Ended
                                                  September 30,                September 30,
                                            ------------------------      -----------------------
                                              1999           1998            1999         1998
                                            ---------      ---------      ---------     ---------
<S>                                         <C>            <C>            <C>           <C>
Production:
   Oil (Bbl)                                      513            588          1,596         1,804
   Gas (Mcf)                                   13,072         12,444         39,468        35,776
   Mcfe                                        16,149         15,969         49,044        46,602
   Boe                                          2,692          2,661          8,174         7,767

Prices:
   Average realized oil price ($/Bbl)       $   20.02      $   13.46      $   15.39     $   15.19
   Average realized gas price ($/Mcf)       $    2.06      $    1.67      $    2.00     $    1.96


Operating Revenues:
   Oil and gas sales                        $  37,142      $  28,694      $ 103,359     $  97,380
   Other gas revenues                           2,281          2,206          7,323         6,306
                                            ---------      ---------      ---------     ---------
                                               39,423         30,900        110,682       103,686
                                            ---------      ---------      ---------     ---------

Operating Costs and Expenses:
   Production taxes                             3,004          1,796          6,899         6,531
   Lease operating                              6,531          6,659         20,382        18,853
   Depreciation, depletion
     and amortization                          11,835         12,875         37,121        37,559
   Exploratory and abandonment                     92            490            657           828
   Geological and geophysical                     119            642            222         1,233
   Impairment and (gain)/loss
     on sales of oil and gas properties           (96)        (1,346)            72        (1,419)
                                            ---------      ---------      ---------     ---------
                                               21,485         21,116         65,353        63,585
                                            ---------      ---------      ---------     ---------
Operating Income                            $  17,938      $   9,784      $  45,329     $  40,101
                                            =========      =========      =========     =========
</TABLE>




                                       17
<PAGE>   18


GENERAL We have been active in the D-J Basin for more than 17 years. Over the
past several years we have further consolidated our position as a result of the
acquisition in June 1996 of all of the D-J Basin properties of Basin
Exploration, Inc. and the December 1997 Amoco acquisition. During 1998 a
substantial exploitation program was undertaken consisting of more than 450
separate activities including refracs, recompletions, deepenings and new wells.
During the nine months ended September 30, 1999 we continued the exploitation
program by completing approximately 250 additional activities.

OIL AND GAS REVENUES D-J Basin revenues increased by 28% for the three months
ended September 30, 1999 and by 7% for the nine months ended September 30, 1999
compared to the comparable prior year periods. The increase in revenues for the
three month period ended September 30, 1999 as compared to the same period in
1998 was due primarily to a higher realized weighted average price. The increase
in revenues for the nine month period ended September 30, 1999 was due to a
higher realized weighted average price in 1999 as well as an increase in
production. Other gas revenues from the sale of tax credits fluctuate with
changes in our production. As a result, other gas revenues remained relatively
flat for the three month period ended September 30, 1999 and increased for the
nine month period ended September 30, 1999 compared to the comparable prior year
periods.

PRODUCTION EXPENSES Lease operating expense ("LOE") decreased both on an
absolute and an Mcfe basis for the quarter ended September 30, 1999 and
increased for the nine months ended September 30, 1999 compared to the
comparable prior year periods. LOE per Mcfe was $0.40 and $0.42 ($2.43 and $2.50
per Boe) for the quarters ended September 30, 1999 and 1998, respectively. For
the nine months ended September 30, 1999 and 1998, LOE per Mcfe was $0.42 and
$0.40 ($2.49 and $2.43 per Boe), respectively. The decrease for the quarter
ended September 30, 1999 is mainly due to a decrease in workover costs in 1999
which was partially offset by an increase in COPAS charges. The increase for the
nine month period ended September 30, 1999 is due to an increase in COPAS
charges and workover costs. The increase in COPAS charges is due to an increase
in the COPAS escalation factor as of April 1, 1999 in accordance with COPAS
guidelines. Production taxes increased for the quarter and nine months ended
September 30, 1999 compared to the comparable prior year periods. The increase
for the quarter ended September 30, 1999 is due to higher realized prices. The
increase for the nine months ended September 30, 1999 is due to higher realized
gas prices which were partially offset by an adjustment we recorded in the
second quarter to reduce the ad valorem tax accrual rate for 1998 and 1999 to
the rate actually paid in 1999.

DEPRECIATION, DEPLETION AND AMORTIZATION Depreciation, depletion and
amortization ("DD&A"), a non-cash expense, decreased on an Mcfe basis for the
quarter and nine months ended September 30, 1999 compared to the comparable
prior year periods. We adjusted our DD&A rate in the second quarter of 1999 to
reflect mid-year reserve revisions. The weighted average depletion rate for the
D-J Basin was $0.73 compared to $0.80 per Mcfe, ($4.36 compared to $4.81 per
Boe) for the quarters ended September 30, 1999 and 1998, respectively. For the
nine months ended September 30, 1999 and 1998




                                       18
<PAGE>   19

the weighted average depletion rate for the D-J Basin was $0.75 compared to
$0.80 per Mcfe ($4.51 compared to $4.81 per Boe), respectively.

EXPLORATORY AND ABANDONMENT COSTS Exploratory and abandonment costs include the
costs of exploratory dry holes, delay rentals, plugging and abandonment ("P&A")
costs, expired acreage and certain salaries and related overhead costs
("overhead") directly related to exploratory activities. Exploratory and
abandonment costs decreased by $398,000 and $171,000 for the quarter and nine
months ended September 30, 1999, respectively, compared to the comparable prior
year periods mainly due to a decrease in exploratory dry hole costs.

GEOLOGICAL AND GEOPHYSICAL COSTS Geological and geophysical ("G&G") costs
include costs for seismic activity as well as certain overhead costs directly
attributable to G&G activity. G&G costs decreased for the quarter and nine
months ended September 30, 1999 compared to the comparable prior year periods
due to a reduced level of seismic activity in the Greater D-J project area.



                                       19
<PAGE>   20
GULF COAST
OIL AND GAS SALES (IN THOUSANDS EXCEPT AVERAGE PRICES)

<TABLE>
<CAPTION>
                                            Three Months Ended           Nine Months Ended
                                               September 30,               September 30,
                                          ----------------------      ----------------------
                                            1999          1998          1999          1998
                                          --------      --------      --------      --------
<S>                                       <C>           <C>           <C>           <C>
Production:
   Oil (Bbl)                                    69             7           173            17
   Gas (Mcf)                                 1,740           100         4,005           559
   Mcfe                                      2,153           142         5,043           659
   Boe                                         359            24           841           110

Prices:
   Average realized oil price ($/Bbl)     $  20.21      $  11.92      $  16.62      $  11.60
   Average realized gas price ($/Mcf)     $   2.81      $   2.03      $   2.47      $   2.29


Operating Revenues:
   Oil and gas sales                      $  6,282      $    286      $ 12,754      $  1,471
   Other gas revenues                           --            --            --            --
                                          --------      --------      --------      --------
                                             6,282           286        12,754         1,471
                                          --------      --------      --------      --------

Operating Costs and Expenses:
   Production taxes                            349            19           714            93
   Lease operating                             201            23           396            73
   Depreciation, depletion
     and amortization                          879            68         2,134           324
   Exploratory and abandonment               4,079           630         7,995         1,834
   Geological and geophysical                  978         2,203         3,907         8,740
   Impairment and loss on sales
     of oil and gas properties                  --         1,061            --         1,061
                                          --------      --------      --------      --------
                                             6,486         4,004        15,146        12,125
                                          --------      --------      --------      --------
Operating Loss                            $   (204)     $ (3,718)     $ (2,392)     $(10,654)
                                          ========      ========      ========      ========
</TABLE>


GENERAL Over the past three years, the majority of our Gulf Coast activities
have focused on the acquisition, processing and interpretation of 3-D seismic
information and the acquisition of leasehold interests. During 1999 and
thereafter we expect to materially increase our level of Gulf Coast drilling
activities on prospects which we have identified through our extensive 3-D
seismic programs.

OIL AND GAS REVENUES Oil and gas revenues increased significantly for the
quarter and nine months ended September 30, 1999 as compared to the comparable
prior year periods as a result of an increase in production and prices. We
drilled 18 gross (9.7 net) wells in the nine months ended September 30, 1999 of
which 10 gross (4.8 net) were successful. Of the total wells drilled to date,
six gross (2.4 net) wells are currently awaiting pipeline hookup.

EXPLORATORY AND ABANDONMENT COSTS Exploratory and abandonment costs increased
for the quarter and nine months ended September 30, 1999 compared to the
comparable




                                       20
<PAGE>   21


prior year periods as a result of an increase in our exploratory drilling
activity. In 1999 we expensed five dry holes in the third quarter and eight dry
holes for the nine month period. Only one dry hole was expensed during the nine
months ended September 30, 1998. We also expensed $0.9 million and $2.8 million
of expired acreage costs in the quarter and nine months ended September 30,
1999, respectively.

GEOLOGICAL AND GEOPHYSICAL COSTS G&G costs decreased for the quarter and nine
months ended September 30, 1999 compared to the comparable prior year periods.
The reduction in G&G costs is attributable to the progression from G&G
evaluation of project areas to drilling activity in those areas.



                                       21
<PAGE>   22




MID-CONTINENT AND OTHER
OIL AND GAS SALES (IN THOUSANDS EXCEPT AVERAGE PRICES)

<TABLE>
<CAPTION>
                                             Three Months Ended          Nine Months Ended
                                                September 30,               September 30,
                                           ----------------------      ----------------------
                                             1999          1998          1999          1998
                                           --------      --------      --------      --------
<S>                                        <C>           <C>           <C>           <C>
Production:
    Oil (Bbl)                                     1            59             1           222
    Gas (Mcf)                                    23         1,835           111         7,631
    Mcfe                                         25         2,189           115         8,965
    Boe                                           4           365            19         1,494

Prices:
    Average realized oil price ($/Bbl)     $  17.90      $   9.27      $  18.40      $  13.00
    Average realized gas price ($/Mcf)     $   1.87      $   1.83      $   1.40      $   1.95


Operating Revenues:
    Oil and gas sales                      $     49      $  3,752      $    167      $ 17,593
    Other gas revenues                           --            17            --            62
                                           --------      --------      --------      --------
                                                 49         3,769           167        17,655
                                           --------      --------      --------      --------

Operating Costs and Expenses:
    Production taxes                             19           254            44         1,202
    Lease operating                              44         1,116           157         4,187
    Depreciation, depletion
      and amortization                            8         1,969            23         7,931
    Exploratory and abandonment                 187           216           446           346
    Geological and geophysical                  196           566           652         1,268
    Impairment and (gain)/loss on
      sales of oil and gas properties        (2,231)        7,027        (1,300)        7,027
                                           --------      --------      --------      --------
                                             (1,777)       11,148            22        21,961
                                           --------      --------      --------      --------
Operating Income (Loss)                    $  1,826      $ (7,379)     $    145      $ (4,306)
                                           ========      ========      ========      ========
</TABLE>


GENERAL Information for this segment includes activity for both the
Mid-Continent and Northern Rockies areas. Activity in the Mid-Continent began on
June 17, 1996 as a result of the merger with Tide West Oil Company. Effective
September 1, 1998, we sold the majority of our Mid-Continent assets and used the
proceeds from the sale to pay down a portion of debt under our senior credit
facility. Our current strategy in the Mid-Continent is to pursue
technology-oriented exploration projects.

Over the past six years we have acquired extensive acreage in the Northern
Rockies region. Our current strategy is to utilize our acreage position as a
vehicle for generating capital expenditures on our acreage by third party
operators.

Due to the Mid-Continent sale effective September 1, 1998, there were virtually
no oil and gas revenues in this segment for the quarter and nine months ended
September 30,




                                       22
<PAGE>   23

 1999. However, in the second and third quarters of 1999 we
recorded additional expenses of $2.4 million related to the 1998 sale of the
Mid-Continent properties and income from the sale of the Blue Forest Unit and
other properties of $3.7 million for a net gain of $1.3 million.

TRADING AND TRANSPORTATION (IN THOUSANDS)

<TABLE>
<CAPTION>
                                             Three Months Ended        Nine Months Ended
                                                September 30,             September 30,
                                            ---------------------     ---------------------
                                              1999         1998         1999         1998
                                            --------     --------     --------     --------
<S>                                         <C>          <C>          <C>          <C>
Operating Revenues:
     Trading and transportation             $ 47,800     $ 35,297     $117,812     $109,155

Operating Costs and Expenses:
     Cost of trading and transportation       46,554       33,508      114,381      104,908
     Depreciation and amortization               108          100          324          302
                                            --------     --------     --------     --------
                                              46,662       33,608      114,705      105,210
                                            --------     --------     --------     --------
Operating Income                            $  1,138     $  1,689     $  3,107     $  3,945
                                            ========     ========     ========     ========
</TABLE>


Through our wholly-owned subsidiary, HSES, we market our own gas production as
well as that of third parties. A portion of this gas is sold directly to end
users, while other amounts are used as the equity-gas foundation for a physical
trading business in which gas volumes may be traded several times at different
receipt and delivery points in order to capture the greatest margin possible.
HSES also serves as an intermediary in the execution of financial derivative
instruments for a variety of energy related products and, to a lesser extent,
makes speculative trades for its own account in the commodity and basis markets.
Operating income decreased in the quarter and nine months ended September 30,
1999 compared to the comparable prior year periods primarily as a result of a
decrease in derivative transaction gains. HSES experienced better opportunities
at attractive risk profiles during the first nine months of 1998 versus the
comparable period in 1999. This was particularly noticeable during the third
quarter of 1999.


OTHER INCOME AND EXPENSES (IN THOUSANDS)

<TABLE>
<CAPTION>

                               Three Months Ended       Nine Months Ended
                                  September 30,            September 30,
                               -------------------     -------------------
                                 1999       1998         1999       1998
                               -------     -------     -------     -------
<S>                            <C>         <C>         <C>         <C>
Interest income and other      $   141     $   504     $   411     $ 1,147
General and administrative     $ 1,467     $ 2,248     $ 3,942     $ 6,238
Interest                       $10,717     $10,889     $31,657     $32,741
Depreciation                   $   240     $   376     $   870     $ 1,204
</TABLE>



INTEREST INCOME AND OTHER INCOME Interest and other income decreased for the
quarter and nine months ended September 30, 1999 compared to comparable prior
year periods. As a result of the Mid-Continent sale we no longer record income
on an interest in a limited partnership.



                                       23
<PAGE>   24


GENERAL AND ADMINISTRATIVE EXPENSES General and administrative expenses ("G&A")
reflect costs incurred, net of administrative costs directly attributable to
drilling and well operations (which costs are included in LOE). Certain G&A
costs directly related to geological and geophysical activities and exploratory
activities are included in geological and geophysical costs and exploratory
costs. G&A per Mcfe was $0.08 and $0.12 ($0.48 and $0.74 per Boe), for the
quarters ended September 30, 1999 and 1998, respectively. For the nine months
ended September 30, 1999 and 1998, G&A per Mcfe was $0.07 and $0.11 ($0.44 and
$0.67 per Boe), respectively. On both an absolute and an Mcfe basis, G&A
decreased for the quarter and nine months ended September 30, 1999 compared to
the comparable prior year periods, due primarily to discontinued G&A
attributable to the 1998 sale of the Mid-Continent properties and the
efficiencies associated with our consolidation program in the D-J Basin.

INTEREST EXPENSE Interest expense decreased for the quarter and nine months
ended September 30, 1999 compared to the comparable prior year periods due to
the decrease in long-term debt attributable to the repayment of $152 million of
bank debt from the proceeds of the Mid-Continent sale. The decrease in interest
expense was partially offset by the decrease in capitalized interest on our
undeveloped properties.

INCOME TAXES (IN THOUSANDS)

<TABLE>
<CAPTION>
                                   Three Months Ended         Nine Months Ended
                                      September 30,              September 30,
                                  --------------------       --------------------
                                    1999        1998           1999        1998
                                  -------      -------       -------      -------
<S>                               <C>          <C>           <C>          <C>
Current provision (benefit)       $    --      $    --       $    --      $    --
Deferred provision (benefit)        2,960       (5,006)        3,098       (4,499)
                                  -------      -------       -------      -------
Provision (benefit) for taxes     $ 2,960      $(5,006)      $ 3,098      $(4,499)
                                  =======      =======       =======      =======

Effective tax rate                   38.1%        38.1%         38.1%        38.1%
                                  =======      =======       =======      =======
</TABLE>


PROVISION FOR INCOME TAXES We follow the provisions of Statement of Financial
Accounting Standards ("SFAS") No. 109. Pursuant to SFAS 109, we have recorded a
tax provision based on tax rates in effect during the period. Accordingly, we
accrued taxes at the rate of 38.1% as of September 30, 1999 and 1998. Due
primarily to significant intangible drilling costs, which are deductible for
income tax purposes, all of our tax provision in 1999 and 1998 is deferred.




                                       24
<PAGE>   25
LIQUIDITY AND CAPITAL RESOURCES

Financing Sources

We believe that our current level of debt and leverage is manageable under
expected production and pricing levels, since our debt is supported by stable,
long-lived producing reserves and by our hedging programs, with short-term
product prices partially hedged at prices that support our bank and other
interest requirements. We expect cash flows from producing activities to be
sufficient to enable us to service our debt for the foreseeable future, absent
any major and prolonged period of low commodity prices. We have a large number
of low-risk, potentially high-return exploitation projects which should enhance
production and cash flow. As part of an overall financing strategy, we
continually evaluate a wide range of future financing alternatives and are not
committed to any particular course. In undertaking any future financing
transactions, we intend to seek to achieve the optimal capital structure needed
to support our long-term strategic objectives. Any such financings will reflect
market conditions at the time and may include the issuance of medium or
long-term debt, equity, or equity-linked securities.

We currently plan to fund capital expenditures attributable to exploration,
exploitation and development activities primarily out of our expected cash flow
from operations, subject to periodic variation resulting from the timing of
project activities and short-term product price volatility.

The borrowing base under our revolving senior bank credit facility with The
Chase Manhattan Bank is currently $280 million. The interest rate under the
Chase facility is the Base Rate plus 0% to 0.625% or LIBOR plus 0.75% to 1.625%.
The borrowing base is based on the Banks' review of our reserves and the Banks'
view of future pricing. Under the terms of the Chase facility, no principal
payments are required until December 15, 2002, assuming we maintain a borrowing
base sufficient to support the outstanding loan balance. As of September 30,
1999, $234 million was outstanding under the Chase facility compared to $230
million at December 31, 1998.

We anticipate that our borrowing capacity under the Chase facility and our
operating cash flow will provide us with adequate financial resources and
flexibility to fund current and ongoing activities, to service our debt and to
meet other financial obligations. The nature of our current development
strategies and other activities provide us with considerable flexibility in
terms of the timing and magnitude of our capital expenditures. If we experience
unforeseen changes in our working capital position or capital resources, we may
revise the capital expenditure program accordingly or alternatively may attempt
to supplement our capital position through, among other things, the issuance of
additional equity, equity-linked or debt securities, the sale or monetization of
properties or by entering into joint venture arrangements.


                                       25
<PAGE>   26


Capital Commitments

We continuously evaluate our inventory of drilling opportunities to develop a
growth-oriented portfolio of risk-balanced development, exploitation and
exploration opportunities. On an ongoing basis, we adjust the amount and
allocation of our capital expenditures based on a number of factors, including
seismic results, prospect readiness, product prices, service company
availability and rates, acquisitions and capital position. For the nine months
ended September 30, 1999, we incurred total costs for exploration, development,
leasehold, exploratory and abandonment and geological and geophysical activities
of $52.0 million, exclusive of capitalized interest and overhead costs directly
related to exploratory and G&G activity. We estimate that such expenditures for
the full year 1999 will be approximately $75 to $85 million, depending on
product prices for the full year. These costs will be allocated in varying
amounts primarily to activities in our core geographic areas.

A major component of our capital program relates to our development activities
in the D-J Basin. We incurred approximately $32.2 million for the nine months
ended September 30, 1999 for costs to drill, deepen, recomplete and refrac our
D-J Basin properties, and anticipate allocating $45 to $50 million to the D-J
Basin for all of 1999.

Another component of our capital program has been to develop our exploitation
and exploration prospects in the onshore portion of the Gulf Coast. For the nine
months ended September 30, 1999, we incurred total expenditures of $18.0 million
for seismic, leasehold and drilling costs in the Gulf Coast. We anticipate
allocating $30 to $35 million to the Gulf Coast projects for all of 1999 for
exploration and development activities including land and seismic.

Activities in our Northern Rockies area are planned to utilize our extensive
acreage position as a vehicle for generating capital expenditures by third party
operators on our acreage. In the third quarter of 1999 much of our effort has
been directed toward consolidating operations on our Greater Green River Basin
gas projects. We continue to seek value-added partners to test new plays and
technologies on our acreage.

We have also entered into a number of other standard industry arrangements that
require the drilling of wells or other activities. We believe that we will meet
our obligations under these arrangements, which individually and in the
aggregate are not material.

Working Capital and Cash Flow

Net cash provided by operating activities for the nine months ended September
30, 1999 was $42.3 million, down from $47.5 million for the same period in 1998
primarily as a result of a reduction in our working capital deficit. Future cash
flows will be influenced by, among other factors, the number of producing wells
on line, product prices and production constraints.


                                       26
<PAGE>   27


Risk Management

We use financial instruments to reduce our exposure to market fluctuations in
the price and transportation cost of oil and gas. Our general strategy is to
hedge price and location risk with swap, collar, floor and ceiling arrangements.
In order to minimize risk, to the maximum extent possible we hedge certain of
our production back to the wellhead. In addition to hedging activities, we are
engaged in using the financial markets to capture trading margins. We have
established policies with respect to open positions which limit our exposure to
market risk and require daily reporting to management of the potential financial
exposure resulting from both hedging and trading activities.

Recently issued accounting pronouncements change current and future accounting
and reporting requirements for certain risk management activities. See Note 2 of
the Notes to Unaudited Consolidated Financial Statements.

Hedging Activities

We enter into transactions for hedging purposes to manage our exposure to price
and location risks in the marketing of our oil and gas production and, in the
case of our marketing activities, third party gas. Gains and losses on hedging
positions are recognized in the period during which the underlying physical
transactions occur and are booked in "oil and gas sales" (for company-owned
production) and "trading and transportation revenues" (for third party gas).

Our general strategy is to hedge price and location risk with swap, collar,
floor and ceiling arrangements. As a part of our risk management program, we
generally enter into hedges for delivery into one of several pipelines located
near our producing regions, Panhandle Eastern Pipeline Company ("PEPL"),
Northwest Pipeline Corporation ("NW"), CIG, or at the New York Mercantile
Exchange ("NYMEX") prices settled at the Henry Hub. With respect to the
NYMEX-hedged volumes that exceed our Gulf Coast volumes, it is our practice to
hedge basis to our producing regions.


                                       27
<PAGE>   28


As of September 30, 1999, we held hedge swap positions as follows:

<TABLE>
<CAPTION>
GAS HEDGES                    Average Daily
                                Quantity        Settlement      Price
     Time Period                 (Mmbtu)         Location     (per Mmbtu)
- --------------------------   ---------------    ----------    ----------
<S>                          <C>                <C>           <C>
October 1999                       50,000          CIG        $    1.900
October 1999                       50,000           NW        $    1.735
October 1999                        5,000           NW        $    2.100
October 1999                       15,000           NW        $    2.130
November 1999-March 2000           10,000          PEPL       $    2.490
November 1999-March 2000            5,000          PEPL       $    2.520
November 1999-March 2000           20,000          PEPL       $    2.700
November 1999-March 2000           10,000           NW        $    2.175
April 2000-October 2000            15,000           NW        $    2.200
April 2000-October 2000             5,000           NW        $    2.200
April 2000-October 2000            10,000           NW        $    2.250
</TABLE>

<TABLE>
<CAPTION>
WRITTEN GAS CALLS             Average Daily
                                 Quantity       Settlement      Price
      Time Period                 (Mmbtu)        Location     (per Mmbtu)
- --------------------------   ---------------    ----------    ----------
<S>                          <C>                <C>           <C>
January 2000-December 2000         20,000         NYMEX       $    3.100
January 2001-December 2001         20,000         NYMEX       $    3.000
</TABLE>

As of September 30, 1999 we had hedged our expected oil production as follows:

<TABLE>
<CAPTION>
CRUDE HEDGES                 Average Monthly
                                Quantity       Settlement      Price
     Time Period                 (Bbl)          Location     (per Bbl)
- --------------------------   ---------------    ----------    ----------
<S>                          <C>                <C>           <C>
October 1999-December 1999       60,800            WTI        $   15.950
October 1999-December 1999       30,400            WTI        $   16.400
October 1999-December 1999       30,667            WTI        $   14.020
October 1999-March 2000          30,556            WTI        $   13.300
</TABLE>

<TABLE>
<CAPTION>
WRITTEN CRUDE CALLS          Average Monthly
                                Quantity        Settlement      Price
     Time Period                 (Bbl)           Location     (per Bbl)
- --------------------------   ---------------    ----------    ----------
<S>                          <C>                <C>           <C>
January 2000-December 2000       61,000            WTI        $   21.400
January 2001-December 2001       60,833            WTI        $   20.400
</TABLE>


Additionally, with respect to the hedging of third party gas, we have hedged 4.1
Bcf from July 1999 through October 2000 with offsetting physical positions at
settlement prices which are based upon NYMEX future prices or other published
indices.

We routinely buy and sell options or forward contracts as part of our overall
hedging strategy. As of September 30, 1999, we had written crude and natural gas
calls through December 2001. These calls are hedged by future production. The
counterparties to these call transactions require the maintenance of specified
margin balances. Fluctuations in the mark-to-market value of these instruments
could result in additional margin requirements over the term of the underlying
contracts.


                                       28
<PAGE>   29


Trading Activities

We engage in the trading of various energy related financial instruments which
require payments to (or receipt of payments from) counterparties based on the
differential between a fixed and a variable price for the commodity, swap or
other contractual arrangement. Activities for trading purposes are accounted for
using the mark-to-market method. Under this method, changes in the market value
of outstanding financial instruments are recognized in "trading and
transportation revenues" as a net gain or loss in the period of change. The
market prices used to value these transactions reflect management's best
estimate considering various factors, including closing exchange and
over-the-counter quotations, time value and volatility factors underlying the
commitments. The values are adjusted to reflect the potential impact of
liquidating our position in an orderly manner over a reasonable period of time
under present market conditions.

Our policy requires that, within defined trading limits, financial instrument
purchase and sales contracts be balanced on a daily basis in terms of contract
volumes and the timing of performance and delivery obligations. During the nine
months ended September 30, 1999, gains of $1.6 million were recognized in
connection with these activities and are included in "trading and transportation
revenues." As of September 30, 1999 we had written call options for which there
are no offsetting positions. These options represent 60,000 mmbtu/day and are
for the month of October 1999. In connection with these call options we
collected a premium of $75,950 which has been included in "trading and
transportation revenues."

Credit Risk

While notional amounts are used to express the volume of various derivative
financial instruments, the amounts potentially subject to credit risk in the
event of nonperformance by the third parties are substantially smaller.
Counterparties to the swap, collar, floor and ceiling arrangements discussed
above are generally investment grade institutions. Accordingly, we do not
anticipate any material impact to our financial position or results of
operations as a result of nonperformance by the third parties to financial
instruments related to hedging activities or trading activities.

Interest Rate Swaps

In the first quarter of 1999, we entered into an interest rate exchange
agreement with a financial institution to hedge $50 million of our borrowings at
5.66% through March 31, 2004. During the fourth quarter of 1998, we entered into
an interest rate exchange agreement with a financial institution to hedge the
interest rate on $80 million of our borrowings at 5.86% through December 15,
2006. Under the terms of the agreements, the difference between the fixed rate
and the one-month LIBOR rate is received or paid by us. As part of the $80
million hedging agreement, we cancelled or offset our previous hedging
agreements. Market risk related to borrowings from a one percent change in


                                       29
<PAGE>   30


interest rates would result in an approximate $1.0 million annual impact on
pre-tax income, based on the quarter end borrowing level and the amount of such
borrowings which are not subject to interest rate swaps.

Total Return Equity Swap

In 1999 we entered into two total return equity swap agreements with a financial
institution. Under the terms of the first agreement, entered into on February
25, 1999, the financial institution acquired approximately 730,000 shares of
HSR's common stock from another investor at a price of $6.0625. We have the
right, but not the obligation, to purchase the stock at a price of $6.0625 per
share at any time through July 1, 2000.

On May 24, 1999 we entered into a second agreement whereby the financial
institution acquired 100,000 shares of HSR's common stock at a price of
$11.9875. We have the right, but not the obligation, to purchase the stock at a
price of $11.9875 per share at any time through January 5, 2001.

If we decide not to purchase the shares on or before the termination of either
agreement, we will receive any increase in the market value of the shares
covered by that agreement above the purchase price of the shares, or will pay
for any loss; however, we may cover any losses by issuing common stock to the
financial institution if we choose to do so. All such amounts will be reflected
in stockholders' equity at the time of settlement. We will also pay certain
commissions and finance costs. At September 30, 1999 the aggregate fair market
value of HSR's common stock in excess of the underlying option price
attributable to such shares was approximately $8.0 million.

Contingencies

In May 1995, we, along with a major oil company, were named as respondents by
the EPA in an administrative order brought under RCRA by the EPA against the
owner/operator of an oilfield production water evaporation facility. Based on
our evaluation of this matter, and after consideration of reserves established,
we believe the resolution of this matter will not have a material adverse effect
on our financial condition or results of operations. See Part II. Other
Information -- Item 1. "Legal Proceedings and Environmental Issues."

Year 2000

We have undertaken and are continuing our analysis and corrective measures to
address the Year 2000 problem. The Year 2000 problem results from computer
programs that were written utilizing two digits rather than four to define an
applicable year. These programs are unable to distinguish between years in
different centuries, eg. 1910 and 2010 appear to be the same year. Therefore,
our computer equipment, software, and devices with embedded technology could
encounter problems beginning on January 1, 2000. This could result in a system
failure or miscalculations causing disruptions of field


                                       30
<PAGE>   31


and/or office operations, as well as disruptions in the business operations of
our vendors and customers.

In addressing the problem, we have considered both our information technology
("IT") systems and non-IT systems. IT systems include computer hardware and
software systems as well as telephone and other communications systems. Non-IT
systems include fax machines, copiers, monitors for field operations, and other
miscellaneous systems. Both IT and non-IT systems may contain embedded
technology, which is also subject to the Year 2000 problem. However, correcting
problems in non-IT systems poses the greatest challenge.

Based upon our assessment and corrective efforts to date, we believe that most
of our IT systems are currently Year 2000 compliant. Only a few non-critical
systems remain uncorrected or untested. These systems generally require only
upgrading or installation of software correction packages which have been
identified and which are available. We currently expect to have these remaining
IT systems in compliance by November 30, 1999.

Virtually all of our non-IT systems are provided by third parties. We have
reviewed our critical path non-IT systems in the D-J Basin. The primary
mechanisms of concern to us were the well control units that electronically
control production from each of the wells. Many of these contain embedded chip
technology. Based on written representations of the manufacturers, however, we
believe that these systems are Year 2000 compliant. Our assessment of non-IT
office systems, such as fax machines and copiers has been completed. We have
contacted the third-party providers or manufacturers of these non-IT office
systems and have obtained representations that such systems are Year 2000
compliant.

Since late in 1998 we have been in the process of identifying our most
significant third-party vendors and service providers to determine their state
of readiness regarding the Year 2000 problem as it relates to us. Our key
third-party providers include gatherers, processors and pipelines, oil and gas
purchasers, our banks, the New York Stock Exchange, our transfer agent, the
property managers of our leased office space, equipment suppliers, major joint
venture partners and others. We have been contacting third-party providers
either verbally or in writing and reviewing their public disclosures concerning
the Year 2000 problem in an effort to determine whether we are vulnerable to the
Year 2000 problems of these third parties.

We have determined that our most reasonably likely worst case scenario would be
a failure of third-party systems necessary to move gas from our wells in the D-J
Basin to the market. In order to assess and mitigate risks in this regard, we
have organized a group of appropriate personnel from companies that are
interdependent for purposes of producing, gathering, compressing, transporting
and processing gas in the D-J Basin along the KN and Duke gathering systems.
Meetings have been held with key producers, and the pipeline and gas plant
operators.


                                       31
<PAGE>   32


Based on the discussions held with these parties, we believe all of the relevant
equipment is either compliant or expected to be compliant by the end of 1999,
and that any failures can be manually overridden. However, the system appears to
be vulnerable to either a failure of utility power for the processing plants or
a failure of the pipeline owned by BP/Amoco that transports plant liquids from
BP/Amoco's Wattenberg gas plant. The plant representatives stated that they have
been given a high degree of assurance that utility systems necessary to run the
plants are year 2000 ready.

We expect to use our existing staff to address our Year 2000 readiness. Labor
costs attributable to our Year 2000 effort are expected to be less than $100,000
and we anticipate that expenditures for remedial software and replacement of IT
systems will be less than $50,000. We estimate that costs associated with
remediation or replacement of non-IT systems (being primarily office equipment
such as fax machines and copiers) will be less than $50,000.

We have considered other potential worst case scenarios including our inability
to execute financial transactions with our banks or other third parties whose
systems fail or malfunction and the inability to properly account for hedging
and trading transactions due to the inability to properly track pricing indices.
We currently have no reason to believe that any of these scenarios are likely to
occur or that our principal vendors, customers, and business partners will not
be Year 2000 compliant. We are not able to develop reasonable contingency plans
for dealing with these other worst case scenarios, but we do not believe they
are likely to occur. However, the extended failure of certain key third-party
systems could potentially have a material adverse effect on us.


                                       32
<PAGE>   33


DISCLOSURE REGARDING FORWARD-LOOKING STATEMENTS

This Form 10-Q includes statements that are not purely historical and are
"forward-looking statements" within the meaning of Section 27A of the Securities
Act and Section 21E of the Securities Exchange Act of 1934, as amended,
including statements regarding our expectations, hopes, beliefs, intentions or
strategies regarding the future. All statements other than statements of
historical facts included in this Form 10-Q are forward-looking statements,
including without limitation, statements under "Legal Proceedings and
Environmental Issues," "Management's Discussion and Analysis of Financial
Condition and Results of Operations," and the "Notes to Consolidated Financial
Statements" regarding:

     o    the allocation of planned capital expenditures and the source of and
          limits on such expenditures;

     o    expected drilling opportunities;

     o    trends or expectations concerning oil and gas prices or market
          characteristics;

     o    expected effect on D-J Basin gas prices from new pipelines;

     o    our financial position, stability of cash flow, debt service
          capabilities and capital availability;

     o    marketing, hedging and trading risks and benefits and our policy of
          attempting to balance open positions;

     o    credit risks associated with trading and marketing;

     o    the ability to manage risk through hedging and similar activities and
          the expectation that we will continue to undertake such activities;

     o    business strategy and other plans and objectives for future
          operations;

     o    potential liabilities or the expected absence thereof;

     o    the potential materiality and amount of Year 2000 compliance expenses
          or the remoteness of the possibility of material losses associated
          with the Year 2000 problem generally;

     o    the potential outcome of environmental matters, litigation or other
          proceedings.


All forward-looking statements included in this Form 10-Q are based on
information available to us on the date hereof, and we assume no obligation to
update such forward-looking statements. Although we believe the forward-


                                       33
<PAGE>   34


looking statements are based on reasonable assumptions, we can give no assurance
that our expectations will prove to have been correct or that we will take any
actions that may presently be planned. Actual results may differ materially from
any forward-looking statements made by us depending on a variety of factors,
including, among others, the Risk Factors described in our report on Form 10-K
filed March 31, 1999.


PART II. OTHER INFORMATION

Item 1. Legal Proceedings and Environmental Issues

Litigation. We are subject to minor lawsuits incidental to operations in the oil
and gas industry. We believe we have meritorious defenses to all lawsuits in
which we are a defendant and will vigorously defend against them. The resolution
of these lawsuits, regardless of the outcome, will not have a material adverse
effect on our results of operations or financial position.

On July 28, 1998, JW Resources, Inc. brought suit against HSR and HSRTW, Inc. in
the United States District Court for the Northern District of Texas, Amarillo
Division (JW Resources, Inc. v. HS Resources, Inc. and HSRTW, Inc., Civil Action
No. 2:98-CV-275). HSRTW, Inc. is now Questar Exploration and Production Company,
and is a subsidiary of Questar Corp. This case, which was discussed in our
report on Form 10-Q filed May 14, 1999, has now been settled and dismissed with
prejudice by the court and all significant costs are reflected in the September
30, 1999 financial statements.

Environmental Proceedings. The owner of an oil field waste disposal facility, a
major oil company and HSR were named as respondents by the EPA in an
administrative order brought by the EPA against Weld County Waste Disposal, Inc.
("WCWDI") under section 7003 of the Resource Conservation and Recovery Act on
May 11, 1995. WCWDI operated and continues to own an evaporation pit in Colorado
for the disposal of non-hazardous production wastes. The EPA order requires that
work be performed to abate a perceived endangerment to wildlife, the environment
or public welfare. We and other non-operators are working together with the EPA
to complete characterization and closure of the facility.

We utilized this facility in past years to dispose of our production and
flowback water. During the period of its use, we believed that the facility was
operating in compliance with all applicable legal requirements and, along with
other oil and gas operators, paid a fee to WCWDI for using this disposal
facility. There were a number of other significant contributors to the facility
during the period reviewed by the EPA (1988 through 1994) and additional
contributors during the period from 1977, when it was constructed, through 1988.
HSR and the major oil company were named because they were deemed the major
contributors of waste volumes to the facility for the period reviewed by the
EPA. Certain other contributors are participating in their share of the
reclamation costs.


                                       34
<PAGE>   35


Based on our current knowledge and our expectation of proportionate
reimbursement from other parties who utilized the facility, we do not believe
that our share of the reclamation costs will have a material impact on our
financial condition or results of operations. By agreement with other
contributing parties, we are currently paying approximately 50% of the costs
associated with the project, but after recovery from additional liable parties,
our percentage share of overall costs may be reduced to as low as 40%. We have
spent approximately $1.2 million on our behalf to date on the project. Our share
of total costs associated with the project are currently estimated to be
approximately $1.3 million. The remaining estimated liability has been accrued
at September 30, 1999.

On March 25, 1999, we voluntarily reported to the United States Corps of
Engineers the likely violation of Section 404 of the Clean Water Act in
connection with several of the HSR operated drillsites in southern Louisiana.
Operations on several drillsites have disturbed wetlands areas without the
required advance permitting. We agreed to promptly conduct wetlands delineations
on all suspect sites and to submit such data to the Corps for after-the-fact
permitting. This effort is now complete. The Corps issued a routine cease and
desist order to HSR prohibiting any further unpermitted wetlands disturbance on
the violation sites. This order does not interfere with continuation of
production on producing wells, but is delaying the hookup of two wells. This
order does not affect our operations on new wells. Responsibility for
disposition of this matter has now been transferred to Region 6 of the
Environmental Protection Agency. The EPA has requested, and we are currently
producing documents to the EPA in connection with their investigation of the
matter. We are unable at this time to predict the outcome of this investigation,
although we expect the EPA (or the U.S. Department of Justice, if the matter is
transferred) may seek to impose a fine or fines, as well as require mitigation
action. The nature of such fines or mitigation cannot be predicted at this time.
See "Management's Discussion and Analysis of Financial Condition and Results of
Operations -- Disclosure Regarding Forward-Looking Statements."

Item 2. Changes in Securities  None.

Item 3. Defaults Upon Senior Securities  None.

Item 4. Submission of Matters to a Vote of Security Holders  None.

Item 5. Other Information  None.


                                       35
<PAGE>   36


Item 6.  Exhibits and Reports on Form 8-K


     a.  Exhibits.

<TABLE>
<CAPTION>
Exhibit
Number   Description
- -------  -----------
<S>      <C>
3.1      Amended and Restated Certificate of Incorporation of the Company.
         (Incorporated herein by reference to Exhibit 3.1 to the Company's
         Registration Statement on Form S-1, No. 33-52774, filed October 2,
         1992.)

3.2      Certificate of Amendment of Certificate of Incorporation filed November
         30, 1998. (Incorporated by reference to Exhibit 3.2 to the Company's
         Quarterly Report on Form 10-Q for the quarter ended March 31, 1999,
         filed May 14, 1999.)

3.3      Third Amended and Restated Bylaws of the Company adopted December 16,
         1996. (Incorporated by reference to Exhibit 3.2 to the Company's
         Registration Statement on Form S-4, No 333-19433, filed January 8,
         1997.)

4.1      Form of Indenture dated December 1, 1993, entered into between the
         Company and the Trustee. (Incorporated by reference to Exhibit 4.7 to
         Amendment No. 3 to the Company's Registration Statement on Form S-3,
         No. 33-70354, filed November 23, 1993.)

4.2      Indenture dated November 27, 1996, among the Company, Orion
         Acquisition, Inc., HSRTW, Inc., and Harris Trust and Savings Bank as
         Trustee. (Incorporated by reference to Exhibit 4.2 to the Company's
         Registration Statement on Form S-4, No 333-19433, filed January 8,
         1997.)

4.3      First Supplemental Indenture dated November 25, 1996 among the Company,
         Orion Acquisition, Inc., HSRTW, Inc., and Harris Trust and Savings Bank
         as Trustee. (Incorporated by reference to Exhibit 4.3 to the Company's
         Registration Statement on Form S-4, No 333-19433, filed January 8,
         1997.)

10.1     Common Stock Purchase Warrant dated July 12, 1990 by the Company to
         James E. Duffy. (Incorporated by reference to Exhibit 10.5 to the Form
         8, Second Amendment to Form 10, filed April 8, 1991.)

10.2     HS Resources, Inc. Rule 701 Compensatory Benefit Plan. (Incorporated by
         reference to Exhibit 10.5.2 to the Form 8, Second Amendment to Form 10,
         filed April 8, 1991.)

10.3     1992 Directors' Stock Option Plan. (Incorporated by reference to
         Exhibit 10.10 to Amendment No. 1 to the Company's Registration
         Statement on Form S-1, No. 33-52774, filed November 9, 1992.)
</TABLE>


                                       36
<PAGE>   37


<TABLE>
<S>      <C>
10.3.1   1993 Directors' Stock Option Plan. (Incorporated by reference to
         Exhibit 10.8.1 to the Company's Annual Report on Form 10-K for the
         fiscal year ended December 31, 1993, filed March 31, 1994 (as amended
         by Form 10-K/A-1 on April 8, 1994.))

10.4     Form of Indemnification Agreement for Directors of the Company.
         (Incorporated by reference to Exhibit 10.16 to the Company's Annual
         Report on Form 10-K for the fiscal year ended December 31, 1995, filed
         March 25, 1996.)

10.5     Lease Agreement dated October 6, 1993, between the Company and JMB
         Group Trust IV and Endowment and Foundation Realty, Ltd. -- JMB III for
         the premises at One Maritime Plaza, San Francisco, California.
         (Incorporated by reference to Exhibit 10.13 to the Company's Annual
         Report on Form 10-K for the fiscal year ended December 31, 1993, filed
         March 31, 1994 (as amended by Form 10-K/A-1 on April 8, 1994.))

10.6     Lease Agreement dated March 28, 1994, between the Company and 1999
         Broadway Partnership for the premises at 1999 Broadway, Denver,
         Colorado. (Incorporated by reference to Exhibit 10.15 to the Company's
         Quarterly Report on Form 10-Q for the quarter ended June 30, 1994,
         filed August 12, 1994.)

10.7     Interest Exchange Agreement between The Chase Manhattan Bank, N.A. and
         the Company dated May 9, 1995. (Incorporated by reference to Exhibit
         10.19 to the Company's Quarterly Report on Form 10-Q for the quarter
         ended June 30, 1995, filed August 14, 1995.)

10.8     Purchase and Sale Agreement, dated December 1, 1995, between the
         Company and Wattenberg Gas Investments, LLC. (Incorporated by reference
         to Exhibit 10.26 to the Company's Annual Report on Form 10-K for the
         fiscal year ended December 31, 1995, filed March 25, 1996.)

10.9     Rights Agreement, dated as of February 28, 1996, between the Company
         and Harris Trust Company of California as Rights Agent. (Incorporated
         by reference to Exhibit 1 to the Company's Form 8-A, filed March 11,
         1996.)

10.10    Purchase and Sale Agreement dated March 25, 1996, between Orion, the
         Company and Wattenberg Resources Land, L.L.C. (Incorporated by
         reference to Exhibit 10.28 to the Company's Quarterly Report on Form
         10-Q for the quarter ended March 31, 1996, filed May 15, 1996.)

10.11    Amended and Restated Credit Agreement dated as of June 14, 1996, among
         the Company, Chase as agent, and the Banks signatory thereto.
         (Incorporated by reference to Exhibit 10.21 to the Company's Quarterly
         Report on Form 10-Q for the quarter ended June 30, 1996, filed August
         14, 1996.)
</TABLE>


                                       37
<PAGE>   38


<TABLE>
<S>      <C>
10.12    First Amendment to Amended and Restated Credit Agreement dated as of
         June 17, 1996, by and among the Company and Chase in its individual
         capacity and as agent for the Lenders. (Incorporated by reference to
         Exhibit 10.22 to the Company's Quarterly Report on Form 10-Q for the
         quarter ended June 30, 1996, filed August 14, 1996.)

10.13    Second Amendment to Amended and Restated Credit Agreement dated as of
         November 27, 1996 among the Company and Chase in its individual
         capacity and as agent for the Lenders. (Incorporated by reference to
         Exhibit 10.22 to the Company's Registration Statement on Form S-4, No
         333-19433, filed January 8, 1997.)

10.14    Purchase and Sale Agreement between the Company and Wattenberg Gas
         Investments, LLC dated April 25, 1996. (Incorporated by reference to
         Exhibit 10.32 to the Company's Quarterly Report on Form 10-Q for the
         quarter ended June 30, 1996, filed August 14, 1996.)

10.15    Purchase and Sale Agreement between Wattenberg Resources Land L.L.C.
         and Wattenberg Gas Investments, LLC dated May 21, 1996. (Incorporated
         by reference to Exhibit 10.33 to the Company's Quarterly Report on Form
         10-Q for the quarter ended June 30, 1996, filed August 14, 1996.)

10.16    Purchase and Sale Agreement between Orion and Wattenberg Gas
         Investments, LLC dated June 14, 1996. (Incorporated by reference to
         Exhibit 10.34 to the Company's Quarterly Report on Form 10-Q for the
         quarter ended June 30, 1996, filed August 14, 1996.)

10.17    Purchase and Sale Agreement between Wattenberg Resources Land L.L.C.
         and Wattenberg Gas Investments, LLC dated June 14, 1996. (Incorporated
         by reference to Exhibit 10.35 to the Company's Quarterly Report on Form
         10-Q for the quarter ended June 30, 1996, filed August 14, 1996.)

10.18    Purchase and Sale Agreement between Orion and Wattenberg Gas
         Investments, LLC dated June 14, 1996. (Incorporated by reference to
         Exhibit 10.36 to the Company's Quarterly Report on Form 10-Q for the
         quarter ended June 30, 1996, filed August 14, 1996.)

10.19    Purchase and Sale Agreement between the Company and Wattenberg Gas
         Investments, LLC dated June 28, 1996. (Incorporated by reference to
         Exhibit 10.37 to the Company's Quarterly Report on Form 10-Q for the
         quarter ended June 30, 1996, filed August 14, 1996.)
</TABLE>


                                       38
<PAGE>   39


<TABLE>
<S>      <C>
10.20    Purchase and Sale Agreement between HSRTW, Inc. and WestTide
         Investments, LLC dated August 9, 1996. (Incorporated by reference to
         Exhibit 10.37 to the Company's Quarterly Report on Form 10-Q for the
         quarter ended September 30, 1996, filed November 7, 1996.)

10.21    Acquisition Agreement between the Company and TCW Portfolio No. 1555 DR
         V Sub-Custody Partnership, L.P. dated August 30, 1996. (Incorporated by
         reference to Exhibit 10.38 to the Company's Quarterly Report on Form
         10-Q for the quarter ended September 30, 1996, filed November 7, 1996.)

10.22    Purchase and Sale Agreement between the Company and Amoco Production
         Company dated November 25, 1997. (Incorporated by reference to Exhibit
         10.1 to the Company's Current Report on Form 8-K, filed December 23,
         1997.)

10.23    Side Letter Agreement between the Company and Amoco Production Company
         dated November 25, 1997. (Incorporated by reference to Exhibit 10.2 to
         the Company's Current Report on Form 8-K, filed December 23, 1997.)

10.24    Closing Side Agreement between the Company and Amoco Production Company
         dated December 15, 1997. (Incorporated by reference to Exhibit 10.3 to
         the Company's Current Report on Form 8-K, filed December 23, 1997.)

10.25    Third Amendment to Amended and Restated Credit Agreement dated as of
         December 15, 1997, among the Company and The Chase Manhattan Bank as
         agent for the Lenders signatory thereto. (Incorporated by reference to
         Exhibit 10.4 to the Company's Current Report on Form 8-K, filed
         December 23, 1997.)

10.26    Purchase and Sale Agreement dated December 15, 1997, by and between HS
         Resources, Inc. as Seller and WestTide Investments, LLC as Buyer.
         (Incorporated by reference to Exhibit 10.46 to the Company's Annual
         Report on Form 10-K for the fiscal year ended December 31, 1997, filed
         March 31, 1998.)

10.27    Fifth Amendment and Supplement to Amended, Restated and Consolidated
         Mortgage, Assignment of Production, Security Agreement and Financing
         Statement between HS Resources (Mortgagor) and The Chase Manhattan
         Bank, as agent for the Lenders, effective as of December 15, 1997.
         (Incorporated by reference to Exhibit 10.37 to the Company's Quarterly
         Report on Form 10-Q for the quarter ended March 31, 1998, filed May 14,
         1998.)

10.28    Agreement and Plan of Merger between Orion Acquisition, Inc. and HS
         Resources, Inc. dated April 20, 1998, but effective May 1, 1998.
         (Incorporated by reference to Exhibit 10.38 to the Company's Quarterly
         Report on Form 10-Q for the quarter ended March 31, 1998, filed May 14,
         1998.)
</TABLE>


                                       39
<PAGE>   40


<TABLE>
<S>      <C>
10.29    First Amendment to Agreement of Lease between 1999 Broadway Partnership
         (Landlord) and HS Resources, Inc. (Tenant), dated March 21, 1997.
         (Incorporated by reference to Exhibit 10.39 to the Company's Quarterly
         Report on Form 10-Q for the quarter ended March 31, 1998, filed May 14,
         1998.)

10.30    HS Resources, Inc. Form of Key Employee Severance Agreement (March 27,
         1998). (Incorporated by reference to Exhibit 10.40 to the Company's
         Quarterly Report on Form 10-Q for the quarter ended March 31, 1998,
         filed May 14, 1998.)

10.31    Fourth Amendment to Amended and Restated Credit Agreement dated as of
         June 16, 1998, among the Company and The Chase Manhattan Bank in its
         individual capacity and as agent for the Lenders. (Incorporated by
         reference to Exhibit 10.41 to the Company's Quarterly Report on Form
         10-Q for the quarter ended June 30, 1998, filed August 14, 1998.)

10.32    Stock Purchase and Sale Agreement between the Company and Universal
         Resources Corporation dated July 27, 1998. (Incorporated by reference
         to Exhibit 10.1 to the Company's Form 8-K, filed August 6, 1998.)

10.33    Fifth Amendment to Amended and Restated Credit Agreement dated as of
         September 1, 1998, among the Company and The Chase Manhattan Bank in
         its individual capacity and as agent for the lenders. (Incorporated by
         reference to Exhibit 10.37 to the Company's Quarterly Report on Form
         10-Q for the quarter ended September 30, 1998, filed November 16,
         1998.)

10.34    Sixth Amendment and Supplement to Amended, Restated and Consolidated
         Mortgage, Assignment of Production, Security Agreement and Financing
         Statement dated as of July 22, 1998, among the Company and The Chase
         Manhattan Bank in its individual capacity and as agent for the Lenders.
         (Incorporated by reference to Exhibit 10.38 to the Company's Quarterly
         Report on Form 10-Q for the quarter ended September 30, 1998, filed
         November 16, 1998.)

10.35    Sixth Amendment to Amended and Restated Credit Agreement dated as of
         December 10, 1998, among the Company and The Chase Manhattan Bank in
         its individual capacity and as agent for the Lenders. (Incorporated by
         reference to Exhibit 10.40 to the Company's Annual Report on Form 10-K
         for the fiscal year ended December 31, 1998, filed March 31, 1999.)

10.36    Seventh Amendment to Amended and Restated Credit Agreement dated as of
         December 31, 1998, among the Company and The Chase Manhattan Bank in
         its individual capacity and as agent for the Lenders. (Incorporated by
         reference to Exhibit 10.41 to the Company's Annual Report on Form 10-K
         for the fiscal year ended December 31, 1998, filed March 31, 1999.)
</TABLE>


                                       40
<PAGE>   41


<TABLE>
<S>      <C>
10.37    1999 Non-Compensatory Stock Purchase Plan. (Incorporated by reference
         as Exhibit 4.1 to Form S-8 filed January 25, 1999.)

10.38    Supplemental Indenture dated as of March 1, 1999, among the Company and
         Harris Trust and Savings Bank as Trustee, amending Indenture dated as
         of December 1, 1993, concerning 9-7/8% Senior Subordinated Notes due
         2003. (Incorporated by reference to Exhibit 10.43 to the Company's
         Annual Report on Form 10-K for the fiscal year ended December 31, 1998,
         filed March 31, 1999.)

10.39    Supplemental Indenture dated as of March 1, 1999, among the Company and
         Harris Trust and Savings Bank as Trustee, amending Indenture dated as
         of November 27, 1996, concerning 9-1/4% Series A Senior Subordinated
         Notes due 2006. (Incorporated by reference to Exhibit 10.44 to the
         Company's Annual Report on Form 10-K for the fiscal year ended December
         31, 1998, filed March 31, 1999.)

10.40    Supplemental Indenture dated as of March 1, 1999, among the Company and
         Harris Trust and Savings Bank as Trustee, amending Indenture dated as
         of December 11, 1998, concerning 9-1/4% Series B Senior Subordinated
         Notes due 2006. (Incorporated by reference to Exhibit 10.45 to the
         Company's Annual Report on Form 10-K for the fiscal year ended December
         31, 1998, filed March 31, 1999.)

10.41*   Seventh Amendment and Supplement to Amended, Restated and Consolidated
         Mortgage, Assignment of Production, Security Agreement and Financing
         Statement dated as of September 1, 1999 among: The Company and The
         Chase Manhattan Bank in its individual capacity, and as agent to the
         Lenders.

10.42*   Eighth Amendment to Amended and Restated Credit Agreement dated as of
         August 27, 1999 among: The Company and The Chase Manhattan Bank in its
         individual capacity, and as agent for the Lenders.

10.43*   Exchange Agreement dated August 27, 1999 between HS Resources, Inc. and
         Patina Oil & Gas Corporation.


27*      Financial Data Schedule
</TABLE>


*  Filed herewith


     b.  Reports on Form 8-K.

         Report dated August 5, 1999, filing the July 27, 1999 press release in
         connection with the Company's second quarter earnings release. Item 5.


                                       41
<PAGE>   42


                                   SIGNATURES

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

                                      HS RESOURCES, INC.


Dated:   November 12, 1999       By:  /s/ JAMES E. DUFFY
                                      ------------------------------------------
                                      James E. Duffy
                                      Vice President and Chief Financial Officer

                                 By:  /s/ ANNETTE MONTOYA
                                      ------------------------------------------
                                      Annette Montoya
                                      Vice President and Principal Accounting
                                      Officer


                                       42
<PAGE>   43

                                INDEX TO EXHIBITS


<TABLE>
<CAPTION>
Exhibit
Number   Description
- -------  -----------
<S>      <C>
10.41    Seventh Amendment and Supplement to Amended, Restated and Consolidated
         Mortgage, Assignment of Production, Security Agreement and Financing
         Statement dated as of September 1, 1999 among: The Company and The
         Chase Manhattan Bank in its individual capacity, and as agent to the
         Lenders.

10.42    Eighth Amendment to Amended and Restated Credit Agreement dated as of
         August 27, 1999 among: The Company and The Chase Manhattan Bank in its
         individual capacity, and as agent for the Lenders.

10.43    Exchange Agreement dated August 27, 1999 between HS Resources, Inc. and
         Patina Oil & Gas Corporation.


27       Financial Data Schedule
</TABLE>


                                       43

<PAGE>   1
                                                                   EXHIBIT 10.41



                       SEVENTH AMENDMENT AND SUPPLEMENT TO
             AMENDED, RESTATED AND CONSOLIDATED MORTGAGE, ASSIGNMENT
            OF PRODUCTION, SECURITY AGREEMENT AND FINANCING STATEMENT

         THIS SEVENTH AMENDMENT AND SUPPLEMENT TO AMENDED, RESTATED AND
CONSOLIDATED MORTGAGE, ASSIGNMENT OF PRODUCTION, SECURITY AGREEMENT AND
FINANCING STATEMENT (this "AMENDMENT") is entered into as of the effective time
and date hereinafter stated (the "EFFECTIVE DATE") by and between HS RESOURCES,
INC., a Delaware corporation with an address for notice hereunder of One
Maritime Plaza, 15th Floor, San Francisco, California 94111 ("MORTGAGOR") and
THE CHASE MANHATTAN BANK, N.A., a national banking association with offices and
banking quarters at One Chase Manhattan Plaza, New York, New York 10005, as
agent for the lenders which are or become parties to the Credit Agreement
referred to below (collectively called the "LENDERS") (in such capacity as
agent, together with its successors in such capacity, the "MORTGAGEE").

                                 R E C I T A L S

         A. Mortgagor, the Agent and certain lenders entered into a Credit
Agreement dated as of July 15, 1994 (as amended, the "1994 CREDIT AGREEMENT")
which amended and restated that certain Credit Agreement dated as of March 11,
1993, as amended.

         B. The 1994 Credit Agreement was secured by, among other things, that
certain Amended, Restated and Consolidated Mortgage, Assignment of Production,
Security Agreement and Financing Statement dated March 11, 1993 from Mortgagor
to the Mortgagee, duly recorded on March 12, 1993 in Book 1373, Film 1766 of the
Real Estate Records of Weld County, Colorado with Reception No. 02324792, as
amended by First Amendment to Amended, Restated and Consolidated Mortgage,
Assignment of Production, Security Agreement and Financing Statement dated May
19, 1993 and duly recorded on August 30, 1993 in Book 1399, Film 1243 of the
Real Estate Records of Weld County, Colorado with Reception No. 02348251, Second
Amendment to Amended, Restated and Consolidated Mortgage, Assignment of
Production, Security Agreement and Financing Statement dated December 10, 1993
and duly recorded on December 20, 1993 in Book 1417, Film 1622 of the Real
Estate Records of Weld County, Colorado with Reception No. 02364884 and Third
Amendment to Amended, Restated and Consolidated Mortgage, Assignment of
Production, Security Agreement and Financing Statement dated as of July 15, 1994
and duly recorded on August 4, 1994 in Book 1453 at Film 1745 of the Real Estate
Records of Weld County, Colorado with Reception No. 2401068 (collectively, the
"HSR MORTGAGE").

         C. The 1994 Credit Agreement was also secured by that certain Mortgage,
Assignment of Production, Security Agreement and Financing Statement dated as of
as of July 30, 1993 from Energy Minerals Corporation and recorded in, among
other counties in the State of Colorado, Adams County on August 4, 1993 in Book
4123, Film 621 and in Weld County on August 4, 1993 in Book 1395, Reception No.
2344624, as amended by First Amendment to Mortgage, Assignment of Production,
Security Agreement and Financing Statement dated as of July 15, 1994
(collectively, the "EMC MORTGAGE") and recorded in, among other counties in the
State of Colorado, Adams County on August 5, 1994 in Book 4369, Page 567 and in
Weld County on August 4, 1994 in Book 1453, Page 1743, Reception No. 2401066.


<PAGE>   2


         D. To evidence the merger of Energy Minerals Corporation into
Mortgagor, Mortgagor and Mortgagee amended, restated and consolidated the HSR
Mortgage and the EMC Mortgage by Amended, Restated and Consolidated Mortgage,
Assignment of Production, Security Agreement and Financing Statement dated as of
September 1, 1995 (which instrument, together with all amendments, assignments
and supplements thereto, is called the "MORTGAGE") which was recorded in, among
other counties in the State of Colorado, Adams County on September 14, 1995 in
Book 4588, Page 745 and in Weld County on September 13, 1995 in Book 1511, Page
203, Reception No. 2455532, as amended by First Amendment and Supplement to
Amended, Restated and Consolidated Mortgage, Assignment of Production, Security
Agreement and Financing Statement dated as of December 14, 1995 (the "FIRST
AMENDMENT TO MORTGAGE") between Mortgagor and Mortgagee and duly recorded on
December 20, 1995 in Weld County, Colorado in Book 1523, Page 665, Reception No.
2468477.

         E. Mortgagor, Mortgagee and certain lenders refinanced the debt under
the 1994 Credit Agreement by entering into that certain Credit Agreement dated
as of June 7, 1996 (the "JUNE 7 CREDIT AGREEMENT").

         F. Mortgagor, Mortgagee and certain lenders (the "LENDERS") amended and
restated the June 7 Credit Agreement by that certain Amended and Restated Credit
Agreement dated as of June 14, 1996 (such Amended and Restated Credit Agreement
as amended from time to time called the "JUNE 14 CREDIT AGREEMENT").

         G. The Mortgage was assigned and amended by Assignment of Liens and
Amendment of Amended, Restated and Consolidated Mortgage, Assignment of
Production, Security Agreement and Financing Statement dated as of June 14, 1996
(the "SECOND AMENDMENT TO MORTGAGE"), which was duly recorded in, among other
counties in the State of Colorado, Adams County on July 12, 1996 in Book 4794,
Page 174 and in Weld County on June 27, 1996 in Book 1554, Page 151.

         H. The Mortgage has been further amended by Third Amendment of Amended,
Restated and Consolidated Mortgage, Assignment of Production, Security Agreement
and Financing Statement dated as of July 25, 1996 (the "THIRD AMENDMENT TO
MORTGAGE"), which was duly recorded in, among other counties in the State of
Colorado, Adams County on September 3, 1996 in Book 4828, Page 624 and in Weld
County on September 3, 1996 in Book 1564, Page 729, Fourth Amendment of Amended,
Restated and Consolidated Mortgage, Assignment of Production, Security Agreement
and Financing Statement dated as of January 1, 1997 (the "FOURTH AMENDMENT TO
MORTGAGE"), which was duly recorded in, among other counties in the State of
Colorado, Adams County on January 30, 1997 in Book 4928, Page 37 and in Weld
County on January 23, 1997 in Book 1588, Page 394, Fifth Amendment to Amended,
Restated and Consolidated Mortgage, Assignment of Production, Security Agreement
and Financing Statement dated as of December 15, 1997 (the "FIFTH AMENDMENT TO
MORTGAGE"), which was duly recorded in, among other counties in the State of
Colorado, Adams County on December 24, 1997 in Book 5193, Page 156 and in Weld
County on December 24, 1997 in Book 1638, Page 1725 and Sixth Amendment to
Amended, Restated and Consolidated Mortgage, Assignment of Production, Security
Agreement and Financing Statement dated as of July 22, 1998 (the "SIXTH
AMENDMENT TO Mortgage"), which was duly


                                      -2-
<PAGE>   3


recorded in, among other counties in the State of Colorado, Adams County on July
23, 1998 in Book 5406 at Page 641 and in Weld County on July 23, 1998 as
Reception No. 2628057.

         I. The Mortgage, the First Amendment to Mortgage, the Second Amendment
to Mortgage, the Third Amendment to Mortgage, the Fourth Amendment to Mortgage,
the Fifth Amendment to Mortgage and the Sixth Amendment

to Mortgage are herein collectively called the "MORTGAGE".

         J. Mortgagor and Mortgagee desire to supplement the Mortgage to subject
to the lien and security interest of the Mortgage the additional properties
described on Exhibits A-1 and A-2 attached hereto.

         NOW, THEREFORE, in view of the foregoing and for valuable
consideration, the receipt of which is hereby acknowledged, Mortgagor and
Mortgagee do hereby agree as follows:

         1. All capitalized terms used but not defined herein shall have the
meanings assigned to such terms in the Mortgage.

         2. All references in the Mortgage to "this Mortgage", as defined in the
opening paragraph of the Mortgage shall mean the Mortgage, as amended and as
supplemented hereby and as the same may from time to time be further amended or
supplemented.

         3. All references in the Mortgage to "Exhibit A" shall mean Exhibit A
to the Mortgage, as supplemented by Exhibits A-1 and A-2 attached to this
Amendment, and as the same may from time to time be further amended or
supplemented and "Hydrocarbon Property", as defined in Section I(a) of the
Mortgage, shall be deemed to also include those oil and gas leases and/or oil,
gas and other mineral leases and other interests and estates and the lands and
premises covered or affected thereby which are described on Exhibits A-1 and A-2
attached to this Amendment.

         4. Mortgagor hereby confirms that it has heretofore granted, bargained,
sold, assigned, mortgaged, warranted, transferred and conveyed, and granted a
security interest to Mortgagee in, the Mortgaged Property, and Mortgagor further
grants, bargains, sells, assigns, mortgages, warrants, transfers and conveys,
and grants a security interest to Mortgagee in, the Mortgaged Property, as
supplemented by Exhibits A-1 and A-2 attached hereto, to Mortgagee on behalf of
the Lenders to secure the payment and performance of the Indebtedness as such
definition is amended herein.

         5. Mortgagor hereby confirms that it has heretofore absolutely and
unconditionally assigned, transferred and conveyed and does hereby absolutely
and unconditionally assign, transfer and convey to Mortgagee, its successors and
assigns, in accordance with the Mortgage as amended hereby, all of the
Hydrocarbons and all products obtained or processed therefrom attributable to
the Hydrocarbon Property, and the revenues and proceeds now and hereafter
attributable to the Hydrocarbons and said products and all payments in lieu of
the Hydrocarbons such as "take or pay" payments or settlements.

         6. The parties hereto hereby acknowledge and agree that except as
specifically amended, changed or modified hereby, the Mortgage, as amended,
shall remain in full force and effect in



                                      -3-
<PAGE>   4


accordance with its terms. None of the rights, titles and interests existing and
to exist under the Mortgage, as amended, are hereby released, diminished or
impaired, and Mortgagor hereby reaffirms all covenants, representations and
warranties made in the Mortgage, as amended.

         7. This Amendment may be executed in two or more counterparts, and it
shall not be necessary that the signatures of all parties hereto be contained on
any one counterpart hereof.

         EXECUTED as of the ____ day of __________________, 1999 (the "EFFECTIVE
DATE").

                                          MORTGAGOR:

                                          HS RESOURCES, INC.

Attest:

                                          By:
                                             --------------------------------
By:                                       Name:
   ----------------------------------     Title:
Name:  James M. Piccone
Title: Secretary

                                          MORTGAGEE:

                                          THE CHASE MANHATTAN BANK (formerly
                                          known as The Chase Manhattan Bank,
                                          N.A.), AS AGENT

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



                                      -4-
<PAGE>   5


STATE OF COLORADO    }
                     }
COUNTY OF DENVER     }


         The foregoing instrument was acknowledged before me on ________________
____, 1999 by ______________________, __________________________ of HS
RESOURCES, INC., a Delaware corporation, on behalf of such corporation.


Seal:                                       Notary Public in and for the
                                            State of Colorado





STATE OF NEW YORK    }
                     }
COUNTY OF NEW YORK   }


         The foregoing instrument was acknowledged before me on
___________________, 1999 by _______________________________________,
___________________________ of THE CHASE MANHATTAN BANK, state banking
corporation, on behalf of such corporation.


Seal:                                       Notary Public in and for the
                                            State of New York



                                      -5-

<PAGE>   1
                                                                   EXHIBIT 10.42

            EIGHTH AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT

         THIS EIGHTH AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT (this
"Amendment") is dated as of August 27, 1999 among: HS RESOURCES, INC., a
corporation formed under the laws of the State of Delaware (the "Borrower");
each of the lenders that is a signatory hereto; and THE CHASE MANHATTAN BANK (in
its individual capacity, "Chase"), as agent for the Lenders (in such capacity,
together with its successors in such capacity, the "Agent").

                                 R E C I T A L S

         A. The Borrower, the Agent, and the Lenders (as defined in the Credit
Agreement as hereafter defined) have entered into that certain Amended and
Restated Credit Agreement dated as of June 14, 1996, as amended by the First
Amendment to Amended and Restated Credit Agreement dated as of June 17, 1996,
the Second Amendment to Amended and Restated Credit Agreement dated as of
November 27, 1996, the Third Amendment to Amended and Restated Credit Agreement
dated as of December 15, 1997, the Fourth Amendment to Amended and Restated
Credit Agreement dated as of June 16, 1998, the Fifth Amendment to Amended and
Restated Credit Agreement dated as of September 1, 1998, the Sixth Amendment to
Amended and Restated Credit Agreement dated as of December 10, 1998 and the
Seventh Amendment to Amended and Restated Credit Agreement dated as of December
31, 1998 (as amended, the "Credit Agreement"), pursuant to which the Lenders
have agreed to make certain loans and extensions of credit to the Borrower upon
the terms and conditions as provided therein; and

         B. The Borrower, the Agent, and the Lenders now desire to make certain
amendments to the Credit Agreement.

         NOW, THEREFORE, in consideration of the premises and other good and
valuable consideration and the mutual benefits, covenants and agreements herein
expressed, the parties hereto now agree as follows:

         1. All capitalized terms used in this Amendment and not otherwise
defined herein shall have the meanings ascribed to such terms in the Credit
Agreement.

         2. Section 1.02 of the Credit Agreement is hereby supplemented, where
alphabetically appropriate, with the addition of the following definitions:

                  "Eighth Amendment" shall mean that certain Eighth Amendment to
         Amended and Restated Credit Agreement dated as of August 27, 1999,
         among the Borrower, the Lenders and the Agent.


<PAGE>   2

         3. Section 9.15 of the Credit Agreement is hereby amended by adding the
following clause (vi):

                   "and (vi) the exchange of the Properties described in the
         letter dated August 19, 1999 from the Borrower attached to the Eighth
         Amendment."

         4. This Amendment shall become binding on the Lenders when, and only
when, the following conditions shall have been satisfied and the Agent shall
have received each of the following, as applicable, in form and substance
satisfactory to the Agent or its counsel:

                  (a) counterparts of this Amendment executed by the Borrower
         and the Majority Lenders; and

                  (b) the completion of the exchange of Properties as described
         in the letter dated August 19, 1999 from the Borrower attached to the
         Eighth Amendment.

         5. The parties hereto hereby acknowledge and agree that, except as
specifically supplemented and amended, changed or modified hereby, the Credit
Agreement shall remain in full force and effect in accordance with its terms.

         6. The Borrower hereby reaffirms that as of the date of this Amendment,
the representations and warranties contained in Article VII of the Credit
Agreement are true and correct on the date hereof as though made on and as of
the date of this Amendment, except as such representations and warranties are
expressly limited to an earlier date.

         7. THIS AMENDMENT (INCLUDING, BUT NOT LIMITED TO, THE VALIDITY AND
ENFORCEABILITY HEREOF) SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH,
THE LAWS OF THE STATE OF NEW YORK.

         8. This Amendment may be executed in two or more counterparts, and it
shall not be necessary that the signatures of all parties hereto be contained on
any one counterpart hereof; each counterpart shall be deemed an original, but
all of which together shall constitute one and the same instrument. Delivery of
an executed signature page of this Amendment by facsimile transmission shall be
effective as delivery of a manually executed counterpart hereof.


         IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed as of the date set forth in the opening paragraph of this Amendment.


                              [SIGNATURES OMITTED]




                                       -2-

<PAGE>   1
                                                                   EXHIBIT 10.43


                               EXCHANGE AGREEMENT

         THIS AGREEMENT ("Agreement") is entered into this _____ day of August,
1999 between HS RESOURCES, INC., a Delaware Corporation ("HSR"), with offices at
1999 Broadway, Suite 3600, Denver, Colorado 80202, and PATINA OIL & GAS
CORPORATION, a Delaware corporation, ("Patina") with offices at 1625 Broadway,
Suite 2000, Denver, Colorado 80202. "Assignor" shall mean the party hereto which
is to assign its rights in the Properties as of the Effective Time: namely, HSR
is the Assignor with regard to Patina Purchase Properties and Patina is the
Assignor with regard to the HSR Purchase Properties. "Assignee" shall mean the
party hereto which is to own the Properties after the Effective Time: namely,
HSR is the Assignee with regard to HSR Purchase Properties, and Patina is the
Assignee with regard to Patina Purchase Properties. The term "Properties" shall
be used throughout this Agreement and shall generally refer to either the HSR
Purchase Properties or the Patina Purchase Properties, as the context requires.

1. HSR Purchase Properties. "HSR Purchase Properties" shall mean those
   properties that HSR is to receive from Patina as follows:

          (a) All of Patina's interest in the Wells described on Exhibit "A-1"
              to this Agreement and all of Patina's right, title and interest in
              and to the leasehold estate as to all depths associated with the
              spacing unit for each Well as described on Exhibit "A-1
              Leasehold"; excluding, however, the wellbore of all existing
              producing wells located in the same spacing unit that are not
              described on Exhibit "A-1";

          (b) All of Patina's interest in the Wells described on Exhibit "A-2"
              to this Agreement and all of Patina's right, title and interest in
              and to the leasehold estate (limited to depths from the surface of
              the Earth to the base of the J Sand) associated with the spacing
              unit for each Well as described on Exhibit "A-2 Leasehold"
              excluding, however, the wellbore of all existing producing wells
              located in the same spacing unit that are not described on Exhibit
              "A-2"; (collectively, the Wells described on Exhibits "A-1" and
              "A-2" and described in subparagraphs (a) and (b) immediately above
              shall be referred to as the "HSR Purchase Wells" and the Leases
              described on Exhibits "A-1 Leasehold" and "A-2 Leasehold" shall be
              referred to as the "HSR Purchase Leases");

          (c) Certain personal property and fixtures used in connection with the
              operation of the HSR Purchase Wells, including, but not limited
              to, all lease equipment, wells, tanks and all other equipment;

          (d) The rights and obligations existing under certain contracts and
              agreements that benefit or burden the HSR Purchase Wells and HSR
              Purchase Leases, including, but not limited to, operating
              agreements, marketing agreements, pooling agreements, unit
              agreements, segregation agreements, farmout agreements, rights of
              way, easements,

                                                                               1
<PAGE>   2


              surface agreements, assignments, purchase and sale agreements, gas
              sale contracts, or gas processing contracts;

          (e) The oil, gas, casinghead gas, condensate, distillate, liquid
              hydrocarbons, gaseous hydrocarbons, products refined and
              manufactured therefrom, other minerals, and the accounts and
              proceeds from the sale of all of the foregoing to the extent such
              production is produced from the HSR Purchase Wells and HSR
              Purchase Leases after the Effective Time and is attributable to
              Patina; and

          (f) Copies of the files, records, data, and other documentary
              information, excluding any seismic, geological or geophysical
              information and data that are interpretive in nature, ("Data")
              maintained by Patina pertaining to the HSR Purchase Wells
              described in sub-paragraph 1(a) above.

2. Patina Purchase Properties. "Patina Purchase Properties," shall mean those
   properties that Patina is to receive from HSR as follows:

          (a) All of HSR's interest in the Wells described on Exhibit "B-1" to
              this Agreement and all of HSR's right, title and interest in and
              to the leasehold estate (limited from the surface of the Earth to
              the base of the J Sand; except for the Ben Houston #1 well and the
              Acord Chadburn well which shall include a wellbore interest in the
              Dakota formation) associated with 160 acre governmental quarter
              section surrounding each J Sand Well listed on the Exhibit "B-1",
              which leasehold includes the 15 Wells listed on Exhibit "B-1" and
              shown as producing from the Codell formation, all as described on
              Exhibit "B-1 Leasehold". In addition, Exhibit "B-1 Leasehold"
              includes leases covering interests from the surface of the Earth
              to the base of the J Sand Formation for five 160 acres parcels on
              which no producing J Sand wells are identified on Exhibit "B-1".
              These five parcels are the NE/4 of Section 14, T3N, R66W; the SW/4
              of Section 33, T3N, R67W; the NE/4 of Section 34, T3N, R67W; the
              SW/4 of Section 9, T3N, R65W; and the SW/4 of Section 32, T4N,
              R65W. As to the J Sand formation in the Strong Gas Unit #1 Well
              (this well for purposes of this Agreement is considered as a J
              Sand well on Exhibit "B-1"), the working interest and net revenue
              interest of HSR in such formation is at least equal to the working
              interest and net revenue interest set forth in Exhibit "B-1" for
              the Codell/Niobrara formations;

          (b) All of HSR's interest in the Wells described on Exhibit "B-2" to
              this Agreement and all of HSR's right, title and interest in and
              to the leasehold estate (limited from the surface of the Earth to
              the base of the Codell formation) associated with the spacing unit
              for each Well as described on Exhibit "B-2 Leasehold", such
              interest to specifically exclude any wells not listed on Exhibit
              "B-2" that are located on the same lands and leases but that
              produce from the J Sand;

          (c) All of HSR's interest in the Wells described on Exhibit "B-3" to
              this Agreement and all of HSR's right, title and interest in and
              to the leasehold estate (limited to those formations, as described
              on Exhibti "B-3 Leasehold", from the surface to the base of


                                                                               2
<PAGE>   3


              the J Sand in which HSR's only working interest ownership is a 1%
              working interest acquired from Amoco) associated with the spacing
              unit for each Well as described on Exhibit "B-3 Leasehold"
              (collectively, the Wells described on Exhibits "B-1", "B-2", and
              "B-3" and described immediately above in subparagraphs (a), (b),
              and (c) shall be referred to as the "Patina Purchase Wells" and
              the Leases described on Exhibits "B-1 Leasehold", "B-2 Leasehold",
              and "B-3 Leasehold" and described immediately above in
              subparagraphs (a), (b), and (c) shall be referred to as the
              "Patina Purchase Leases");

          (d) Certain personal property and fixtures used in connection with the
              operation of the Patina Purchase Wells, including, but not limited
              to, all lease equipment, wells, tanks and all other equipment;

          (e) The rights and obligations existing under certain contracts and
              agreements that benefit or burden the Patina Purchase Wells and
              the Patina Purchase Leases, including, but not limited to,
              operating agreements, marketing agreements, pooling agreements,
              unit agreements, segregation agreements, farmout agreements,
              rights of way, easements, surface agreements, assignments,
              purchase and sale agreements, gas sale contracts, or gas
              processing contracts;

          (f) The oil, gas, casinghead gas, condensate, distillate, liquid
              hydrocarbons, gaseous hydrocarbons, products refined and
              manufactured therefrom, other minerals, and the accounts and
              proceeds from the sale of all of the foregoing to the extent such
              production is produced after the Effective Time from the Patina
              Purchase Wells under the Patina Purchase Leases and is
              attributable to HSR; and

          (g) Copies of the Data maintained by HSR pertaining to the Patina
              Purchase Wells described in sub-paragraph 2(a) above.

           3. Exchange of Properties. In consideration of the covenants and
              conditions contained in this Agreement and other good and valuable
              consideration, the receipt and sufficiency of which are hereby
              acknowledged:

              (a) Subject to the provisions of this Agreement, on the Closing
                  Date HSR shall exchange with and assign to Patina the Patina
                  Purchase Properties as of the Effective Time;

              (b) Subject to the provisions of this Agreement, on the Closing
                  Date Patina shall exchange with and assign to HSR the HSR
                  Purchase Properties as of the Effective Time; and

              (c) The parties recognize that certain formations included in
                  certain of the Properties are subject to tax credit agreements
                  relating to production from such formations and, although
                  these tax credit agreements will be terminated prior to
                  Closing, the interests that were subject to the tax credit
                  agreements may not be utilized in a


                                                                               3
<PAGE>   4


                  like kind exchange. To the extent necessary, the portion of
                  the Properties that were subject to tax credit agreements
                  shall be deemed to be exchanged in a separate agreement
                  identical to this Agreement, in order that the remaining
                  Properties and formations are exchanged under section 1031 of
                  the Internal Revenue Code of 1986, as amended. It is the
                  parties intent that these remaining interests be exchanged on
                  accordance with section 1031 of the Code.

           4. Reserved Interests. Assignor shall reserve and except from the
              exchange of the Properties in favor of itself, its successors and
              assigns all accounts receivable attributable to the Properties
              being assigned that are, in accordance with generally accepted
              accounting principles, attributable to the period prior to the
              Effective Time.

           5. Adjustments on Closing Date. The parties have agreed for purposes
              of making certain adjustments that the Wells shall be allocated a
              value of $10,000,000 (but Patina may also include in its
              allocation a value for the five 160 acre parcels described above
              in subparagraph 2(a) relating to the Patina Purchase Wells) for
              the interests that the Assignee will be receiving in the exchange.
              The allocated values shall be used solely for the adjustments that
              may be necessary for title and environmental matters, and other
              matters for which adjustment is typically made as set forth
              herein, that are discovered by the parties prior to Closing. The
              allocated values shall have no other purpose and each party is
              otherwise free to value the properties for its own internal
              purposes or tax purposes in any manner it so chooses. For sales
              tax purposes, the parties have each allocated a value of $30,000
              to the personal property that is part of the Properties being
              exchanged. The allocated value of the HSR Purchase Properties, as
              allocated by HSR, is set forth on a Property-by-Property basis on
              Exhibit A- 1 and A-2 ("HSR Allocated Value"). The Allocated Value
              of the Patina Purchase Properties, as allocated by Patina, is set
              forth on a Property-by-Property basis on Exhibit B-1, B-2, and B-3
              ("Patina Allocated Value"; as the context requires, the HSR
              Allocated Value and the Patina Allocated Value may for a
              particular Property be referred to as simply the "Allocated Value"
              for that Property).

           6. Preliminary Settlement Statement. At Closing, HSR and Patina shall
              execute and deliver a settlement statement, prepared in accordance
              with this Agreement and generally accepted accounting principles
              (the "Preliminary Settlement Statement") that shall set forth the
              payments to be made to each other as set forth in this Agreement
              and the calculation used to determine such amount. Assignor shall
              provide Assignee with the Preliminary Settlement Statement for the
              Properties being assigned three days prior to Closing for
              Assignee's review and approval.

           7. Adjustments. The Preliminary Settlement Statement shall include a
              credit adjustment for the Assignor for expenses attributable to
              its Properties since the Effective Time which have been paid by
              Assignor prior to the Closing Date. The Preliminary Settlement
              Statement shall include a debit adjustment for the Assignor for
              all revenues from production from its Properties since the
              Effective Time which have been received by the Assignor prior to
              the Closing Date.


                                                                               4
<PAGE>   5


           8. Conveyance. Subject to the conditions set forth below, in HSR's
              Denver office, Assignor shall convey to Assignee all of Assignor's
              right, title, and interest in the appropriate Properties by
              delivering on August 31, 1999 (the "Closing Date") an executed,
              acknowledged, and recordable blanket Assignment, Bill of Sale and
              Conveyance, substantially in the form attached hereto as Exhibit
              "E" (for the HSR Purchase Properties) and Exhibit "F" (for the
              Patina Purchase Properties). If necessary, certain Wells may be
              exchanged on separate assignment forms in order to include
              specific reservations or exceptions to the conveyances resulting
              from the need to execute segregation agreements pertaining to that
              Well and existing wells in the same spacing unit. Title to certain
              of the HSR Purchase Properties is held in SOCO Wattenberg
              Corporation, a wholly owned subsidiary of Patina. SOCO Wattenberg
              will be made a party to the conveyance document for these
              interests.

           9. Delivery of Data. Assignor shall deliver copies of the Data to
              Assignee within fourteen (14) days after the Closing Date. The
              Data provided to Assignee shall not include any confidential
              correspondence, and shall not include any information which, if
              disclosed, would cause Assignor to breach any contract or
              agreement. Assignor shall retain originals of the Data. Assignor
              makes no representations or warranties as to the accuracy or
              completeness of the Data. Assignor shall not allow Assignee access
              to geophysical or seismic records if by so doing it would be in
              breach of any contract or agreement. If Assignee, in its
              reasonable opinion, desires to review or copy information
              maintained by Assignor for a Property that is not described in
              sub-paragraphs 1(a) or 2(a) above, excluding any seismic or
              geological or geophysical information and data that is
              interpretive in nature, and Assignor is not precluded under
              obligations of confidence from disclosing such information, upon
              request to Assignor and reasonable advance notice, Assignee may
              review such information in the office of Assignor during normal
              business hours or make a copy of such information at the consent
              of Assignor.

          10. Effective Time. The ownership of the Properties shall be
              transferred from Assignor to Assignee on the Closing Date,
              effective as of 7:00 a.m. at the location of the Properties on
              July 1, 1999 (the "Effective Time"), except for tax credits on
              production for which the Effective Time shall be deemed to be
              September 1, 1999 at 7:00 a.m. Assignor shall be entitled to all
              amounts realized from, and accruing to, the Properties prior to
              the Effective Time, including the right to all production in
              storage, processing and inventory, and shall be responsible for
              all expenses for the development and operation of the Properties
              prior to the Effective Time. Assignee shall be entitled to any
              amounts realized from, and accruing to, the Properties subsequent
              to the Effective Time and shall be responsible for all expenses
              for the development and operation of the Properties subsequent to
              the Effective Time. The Preliminary Settlement Statement and the
              Final Settlement Statement shall include payments between the
              parties as appropriate consistent with the above allocation of
              expenses and revenues.


                                                                               5
<PAGE>   6


          11. Covenants and Agreements of Assignor. During the period from the
              date of this Agreement to the Closing Date, Assignor agrees,
              unless specifically waived by Assignee in writing, as follows:

                   (1) Subject to the provisions of applicable operating and
                  other agreements, Assignor shall continue to operate and
                  administer the Properties to be assigned by Assignor in a good
                  and workmanlike manner consistent with its past practices, and
                  shall carry on its business with respect to such Properties in
                  substantially the same manner as before execution of this
                  Agreement.

                   (2) Assignor shall, except for emergency action taken in the
                  face of risk to life, property or the environment, submit to
                  Assignee for prior written approval, all requests for
                  operating or capital expenditures and all proposed contracts
                  and agreements relating to the Properties to be assigned by
                  Assignor that involve individual commitments of more than
                  $10,000 net to Assignor's interest.

                   (3) Assignor shall nominate on behalf of Assignee natural gas
                  production for the month of September, 1999 consistent with
                  its current practices.

          12. Covenants and Agreements of Assignee. Assignee shall, subject to
              the applicable terms of existing operating agreements, take over
              operations as of 7:00 a.m. local time at the wellsites on the day
              after Closing Date, with respect to Assignor-operated Wells
              included in the Properties assigned to Assignee at the Closing.
              Assignor shall use its best efforts (without expending money or
              extraordinary amounts to time) to recommend to the other working
              interest owners that Assignee succeed Assignor as operator, but
              Assignor has no obligation to assure that Assignee will succeed
              Assignor as operator. Upon taking over operations, Assignee will
              post all necessary state, federal and local bonds and shall assist
              Assignor in having Assignor's existing bonds released, or in the
              alternative, having the wells operated by Assignee released from
              Assignor's existing bond.

          13. Assumption of Liabilities and Indemnity. If Closing occurs, and
              except for title matters which are governed exclusively under
              paragraphs 18 and 19 and gas balancing matters which are covered
              under paragraph 23:

                     (A) AS TO PROPERTIES BEING ASSIGNED TO ASSIGNEE FOR WHICH
                     ASSIGNEE IS THE OPERATOR PRIOR TO CLOSING,

                     ASSIGNEE SHALL BE RESPONSIBLE FOR AND SHALL PAY AND BEAR
                     ALL COSTS, RISKS, LIABILITIES, AND OBLIGATIONS ATTRIBUTABLE
                     TO SUCH PROPERTIES THAT ARISE BEFORE OR AFTER THE EFFECTIVE
                     TIME, EXCEPT TO THE EXTENT ALLOCATED TO ASSIGNOR UNDER THIS
                     AGREEMENT (THE "ASSIGNEE OBLIGATIONS"). ASSIGNEE SHALL
                     DEFEND, INDEMNIFY AND SAVE AND HOLD HARMLESS ASSIGNOR, ITS
                     OFFICERS, DIRECTORS, EMPLOYEES AND AGENTS AGAINST ALL
                     LOSSES, DAMAGES, CLAIMS, DEMANDS, SUITS, COSTS, EXPENSES,
                     LIABILITIES AND SANCTIONS OF EVERY KIND AND CHARACTER,
                     INCLUDING


                                                                               6
<PAGE>   7


                     WITHOUT LIMITATION REASONABLE ATTORNEYS' FEES, COURT COSTS
                     AND COSTS OF INVESTIGATION, WHICH ARISE FROM OR IN
                     CONNECTION WITH ANY ASSIGNEE OBLIGATIONS.

                     (B) AS TO PROPERTIES BEING ASSIGNED TO ASSIGNEE FOR WHICH
                     ASSIGNEE IS NOT THE OPERATOR PRIOR TO CLOSING,

                     ASSIGNOR SHALL DEFEND, INDEMNIFY AND SAVE AND HOLD HARMLESS
                     ASSIGNEE, ITS OFFICERS, DIRECTORS, EMPLOYEES AND AGENTS,
                     AGAINST ALL LOSSES, DAMAGES, CLAIMS, DEMANDS, SUITS, COSTS,
                     EXPENSES, LIABILITIES AND SANCTIONS OF EVERY KIND AND
                     CHARACTER, INCLUDING WITHOUT LIMITATION REASONABLE
                     ATTORNEYS' FEES, COURT COSTS AND COSTS OF INVESTIGATION,
                     WHICH ARISE FROM OR IN CONNECTION WITH ANY CLAIMS (I) THAT
                     HAVE BEEN ASSERTED BY A THIRD PARTY IN WRITING TO ASSIGNOR
                     ON OR BEFORE THE CLOSING DATE OR (II) THAT ARE ASSERTED BY
                     A THIRD PARTY ARISING FROM OR IN CONNECTION WITH THE
                     OWNERSHIP OF SUCH PROPERTIES BY ASSIGNOR PRIOR TO THE
                     EFFECTIVE TIME IF SUCH CLAIMS ARE ASSERTED IN WRITING TO
                     EITHER ASSIGNOR OR ASSIGNEE WITHIN ONE YEAR FROM THE
                     CLOSING DATE AND ONLY TO THE EXTENT THAT THE AGGREGATE OF
                     ALL LOSSES, DAMAGES, COSTS, LIABILITIES, OBLIGATIONS AND
                     EXPENSES SUFFERED BY ASSIGNEE AS A RESULT OF SUCH CLAIMS
                     EXCEEDS A DEDUCTIBLE OF $150,000. Regarding environmental
                     matters, the indemnity set forth above shall apply to and
                     cover third party claims only to the extent that the
                     aggregate of all losses, damages, costs, liabilities,
                     obligations and expenses suffered by Assignee as a result
                     of each such claim exceeds $5,000 and only if, when taken
                     in conjunction with any qualifying environmental defects
                     for which Assignee notified Assignor pursuant to paragraph
                     18 below, the aggregate of all losses, damages, costs,
                     liabilities, obligations and expenses suffered by Assignee
                     as a result thereof exceed a deductible of $150,000. If
                     such aggregate amount exceeds the $150,000 deductible,
                     Assignee shall be entitled to indemnification from Assignor
                     for all such excess amounts.

                     (C) Patina entered into a Letter Agreement with Damson
                     Investment Group, Inc. dated March 5, 1999 covering some of
                     the HSR Purchase Wells. In addition to the indemnities set
                     forth above, Patina shall defend, indemnify and save and
                     hold harmless HSR and its officers, directors, employees
                     and agents, against all losses, damages, claims, demands,
                     suits, costs, expenses, liabilities, and sanctions of every
                     kind and character, including without limitation reasonable
                     attorney's fees, court costs and costs of investigation,
                     which arise from or in connection with the transaction with
                     Damson covered by the above referenced Letter Agreement. If
                     HSR receives a claim for which it is entitled to
                     indemnification under this paragraph C, HSR shall promptly
                     forward such claim to Patina and Patina shall assume the
                     defense thereof. In such event, Patina shall have the sole
                     and exclusive authority to settle such claim, as long


                                                                               7
<PAGE>   8


                     as the settlement does not effect the ownership of the
                     affected property now held by HSR.

                     (D) The indemnities set forth in paragraphs (A) and (B)
                     above do not cover claims for improper payment of
                     production proceeds where the party seeking indemnification
                     was distirbuted such proceeds (from the indemnifying party)
                     and has improperly further disbursed such proceeds to third
                     parties and such third parties assert a claim regarding the
                     improper disbursement. Such claims will be the
                     responsibility of the party that improperly distributed the
                     proceeds to third parties.

          14. Contracts. Assignee shall assume and agree to perform under the
              contracts and agreements that benefit and burden the Properties as
              of the Effective Time.

          15. Warranties. The assignment from Assignor to Assignee shall be made
              without warranty of title to the Properties, either express or
              implied, except that the Properties shall be conveyed to Assignee
              free and clear of all liens and encumbrances created by, through,
              and under Assignor. Assignee assumes the risk of condition of the
              Properties, including compliance with all laws, rules, orders and
              regulations affecting the environment, whether existing before or
              after the Closing Date, except as otherwise set forth in this
              Agreement. The Assignment and Bill of Sale from Assignor to
              Assignee shall disclaim any warranty of merchantability or fitness
              for particular purpose as to the Equipment, and Assignee shall
              accept the Equipment "As Is," in its present location and
              condition.

          16. Representation of Assignor. There is no action, suit, or
              proceeding (including, without limitation, takings under
              condemnation or eminent domain) pending, or to the knowledge of
              Assignor threatened, against the Properties. There is no claim or
              demand (including, without limitation, takings under condemnation
              or eminent domain) pending, or to the knowledge of Seller
              threatened, against the Properties which would have a material
              adverse affect on the value, operation or Assignor's ownership of
              the affected Property (measured individually and in the
              aggregate).

          17. Representation of Assignee. Assignee is experienced and
              knowledgeable in the oil and gas business and is aware of its
              risks. It acknowledges that Assignor has made no representations
              or warranties whatever, express or implied, as to the reserves
              attributable to the Properties or the value thereof, as to the
              condition or state of repair of any of the Properties or as to the
              legal, tax or other consequences of the transaction contemplated
              by this Agreement. In entering into this Agreement, Assignee has
              relied solely upon its independent investigation of, and judgment
              with respect to, such matters. It acknowledges and accepts the
              risks and absence of liquidity inherent in ownership of the
              Properties.

          18. Review Period. Upon execution of this Agreement, Assignee shall
              have the right, at reasonable times during normal business hours,
              to conduct its investigation into the status of the title and
              environmental condition of the Properties. All information


                                                                               8
<PAGE>   9


              regarding the Properties furnished by Assignor to Assignee is
              furnished to Assignee solely as a courtesy, and Assignor makes no
              representation or warranties concerning its accuracy or
              completeness, and assumes no liability for any use by Assignee
              whatsoever. Assignee agrees that any inspection it makes of the
              Properties is at its sole cost and risk and agrees to hold
              harmless and indemnify Assignor for any damages or injury of any
              kind incurred by any party as the result of such inspection. If,
              in the course of conducting such investigation, Assignee discovers
              environmental or title defects materially affecting the
              Properties, Assignee may, no later than 5 days prior to the
              Closing Date, notify Assignor in writing specifying such defects,
              the Properties affected thereby, and Assignee's estimate of the
              net reduction in Allocated Value of the Properties affected by
              such defects. If Assignee fails to notify Assignor no later than 5
              days prior to the Closing Date of any such defects, the defects
              will be deemed waived. Assignor shall be released from any
              liability therefor, the parties shall proceed with closing,
              Assignor shall be under no obligation to correct the defects, and
              Assignee shall assume the risks, liability and obligations
              associated with such defects. No adjustment for title or
              environmental defects shall be made unless and until, and only to
              the extent that the individual value of each title or
              environmental defect exceeds $5,000 per Well and the aggregate
              value of all such defects exceeds a deductible of $150,000. No
              adjustments shall be made for the first $150,000 of such defects.

          19. Defect Remedies. Subject to the limitations contained in
              Paragraph 18, for each Well for which Assignee provided written
              notice to Assignor of a title or environmental defect as provided
              in paragraph 18, prior to the Closing Date Assignor and Assignee
              shall agree that (i) the title or environmental defect has been
              removed by Assignor, (ii) Assignee agrees to waive the relevant
              title or environmental defect and purchase the affected Lease
              notwithstanding the defect, (iii) Assignor agrees to indemnify
              Assignee against all losses, costs, expenses and liabilities with
              respect to such title or environmental defect, provided that
              Assignee agrees to such indemnification, which will not be
              unreasonably withheld, (iv) Assignee and Assignor agree to an
              amount by which the Allocated Value of the affected Well has been
              reduced and such amount shall be included in the Preliminary
              Settlement Statement. Assignee shall have no remedy for any title
              or environmental defect after the Closing Date, except as to third
              party claims covered under paragraph 13 regarding environmental
              claims.

          20. Casualty Loss. If subsequent to the date of this Agreement and,
              prior to the Closing, all or any material portion of the
              Properties to be conveyed to Assignee at the Closing is destroyed
              by fire or other casualty, is taken in condemnation or under the
              right of eminent domain or proceedings for such purposes are
              pending or threatened, Assignee shall receive such interest
              notwithstanding any such destruction, taking or pending or
              threatened taking. Assignor shall, at the Closing, pay to Assignee
              all sums paid to Assignor by third parties by reason of the
              destruction or taking of such Properties to be assigned to
              Assignee, and shall assign, transfer and set over unto Assignee
              all of the right, title and interest of Assignor in and to any
              unpaid awards or other payment from third parties arising out of
              the destruction, taking or pending or threatened


                                                                               9
<PAGE>   10


              taking as to such interest to be conveyed to Assignee. In
              addition, Assignor shall pay to Assignee the amount of Assignor's
              deductible under the applicable insurance policy or policies.
              Assignor shall not voluntarily compromise, settle or adjust any
              material amount payable by reason of any material destruction,
              taking or pending or threatened taking as to the interest to be
              conveyed to Assignee without first obtaining the written consent
              of Assignee.

          21. Taxes. Severance, conservation and other production taxes
              attributable to the production from the Properties shall be the
              obligation of the party entitled to such production. Each party
              will be responsible for the filing and collection of any severance
              tax refunds attributable to the production for which they were
              entitled.

              Ad valorem and personal property taxes attributable to the
              Properties shall be prorated between Assignee and Assignor as of
              the Effective Time as described below. Both parties understand and
              agree that the payment of ad valorem and personal property taxes
              is generally the obligation of the operator. The operator
              typically withholds or collects such taxes from other interest
              owners and remits full payment to the proper taxing authority.
              Based on this understanding, (i) Patina will be responsible for
              the payment of ad valorem taxes attributable to the Properties
              described on Exhibits A-1, B-2 and B-3 for the 1999 tax assessment
              year, which are based on the value of 1998 production and payable
              in 2000, (ii) Patina will be responsible for the payment of ad
              valorem taxes attributable to the Properties described on exhibits
              B-1, B-2 and B-3 for the 2000 tax assessment year, which are based
              on the value of 1999 production and payable in 2001, (iii) Patina
              will receive credit on the Preliminary Settlement Statement for
              estimated ad valorem taxes attributable to the Properties
              described on Exhibit B-1 for the portion of the 2000 tax
              assessment year related to production from January 1, 1999 through
              June 30, 1999, (iv) HSR will be responsible for the payment of ad
              valorem taxes attributable to the Properties described on Exhibits
              A-2 and B-1 for the 1999 tax assessment year, which are based on
              the value of 1998 production and payable in 2000, (v) HSR will be
              responsible for the payment of ad valorem taxes attributable to
              the Properties described on Exhibit A-1 and A-2 for the 2000 tax
              assessment year, which are based on the value of 1999 production
              and payable in 2001, and (vi) HSR will receive credit on the
              Preliminary Settlement Statement for estimated ad valorem taxes
              attributable to the Properties described on Exhibit A-1 for the
              portion of the 2000 tax assessment year related to production from
              January 1, 1999 through June 30, 1999. The estimated ad valorem
              taxes described in (iii) and (vi) above will be based on the value
              of production attributable to the Properties for such period and
              the most recent published mill levies available for the applicable
              counties. These estimates will be adjusted, if necessary on the
              Final Settlement Statement at which time they will be final with
              no further adjustments being made for actual ad valorem taxes
              paid. Notwithstanding the foregoing, Patina and HSR agree that if
              certain third party purchasers of oil and gas have remitted ad
              valorem tax withholding to either Patina or HSR as non-operator of
              the Properties, Patina or HSR will remit the funds to the operator
              through the Preliminary Settlement Statement.

                                                                              10
<PAGE>   11


              Personal property taxes have not yet been assessed for 1999 and
              thus have not been billed to non-operated working interests.
              Personal property taxes assessed against the personal property and
              fixtures associated with the HSR Purchase Wells for the 1999 tax
              assessment year will be paid by HSR, and such taxes assessed
              against the personal property and fixtures associated with the
              Patina Purchase Wells for the 1999 tax assessment year will be
              paid by Patina. On the Preliminary Settlement Statement, HSR will
              be entitled to receive a credit for 50% of the estimated personal
              property taxes attributable to the HSR Purchase Wells and Patina
              will be entitled to receive a credit for 50% of the estimated
              personal property taxes attributable to the Patina Purchase Wells.
              Both parties using the best valuation and mill levy data available
              will estimate the amount of such taxes. The estimates will be
              included in the Preliminary Settlement Statement at Closing. These
              estimates will be adjusted, if necessary, on the Final Settlement
              Statement at which time they will be final with no further
              adjustments being made for actual personal property taxes paid.

          22. Post Closing Accounting. An accounting shall be held no later than
              90 days after the Closing Date. At that time Assignor shall
              furnish to Assignee a complete account as to all invoices paid and
              all revenues received attributable to all operations on, and
              production from, the Properties assigned to Assignee during the
              period from the Effective Time to the Closing Date. Such account
              shall be settled between the parties by the payment of cash, as
              appropriate, pursuant to a Final Settlement Statement, to be
              prepared by Assignor and approved by both parties. Assignor shall
              not charge the Assignee COPAS or other general and administrative
              overhead for the Properties being assigned to Assignee for the
              period between the Effective Time and the Closing Date.

          23. Gas Balancing. The estimated volume of such underproduction or
              overproduction attributable to the HSR Purchase Properties is set
              forth on a Property-by-Property basis on Exhibit C hereto. The
              estimated volume of such underproduction or overproduction
              attributable to the Patina Purchase Properties is set forth on a
              Property-by-Property basis on Exhibit D hereto. Prior to the
              completion of the Final Settlement Statement, the Parties will use
              their best efforts to update (to the Effective Time) the volume
              amounts listed on Exhibits C and D. The Final Settlement Statement
              shall include an adjustment for the value of the underproduction
              or overproduction of gas attributable to the Assignor's interest
              in the Properties as of the Effective Time, such adjustment to be
              based on a value of $1.00 per MCF. If Assignor and a third party
              operator (other than Assignee) disagree as to the amount of any
              imbalance, Assignee and Assignor shall mutually agree to an amount
              for purposes of this paragraph. After the completion of the Final
              Settlement Statement, there shall be no further adjustment made as
              to gas imbalance on any of the Properties and the Assignee shall
              be responsible for and administer all gas imbalance matters
              affecting the Properties received in the exchange by Assignee.


                                                                              11
<PAGE>   12


          24. Peltier Well. HSR and Patina agree that the gas imbalance account
              for the Peltier 1-15 well located in the NW/4 of Section 15, T1S,
              R69W as of the Effective Time shall be considered to be in balance
              (ie the gas imbalance for the well shall be reduced to zero).

          25. Operations Liability. Upon Closing Assignee will comply with all
              laws and governmental regulations with respect to all operations
              associated with the Wells assigned to it hereunder, including
              abandonment of wells, the compliance with laws or rules regarding
              the environment, and regarding inactive or unplugged wells,
              including bonding requirements, and surface work as specified in
              the applicable oil and gas leases or applicable law or regulation.

          26. Post Closing Administrative Accounting Responsibilities. To the
              extent Assignor is presently involved in the administration of the
              Properties, Assignor shall retain the obligation and
              responsibility for the administration of the Properties for the
              period ending on the Closing Date. However, Assignor and Assignee
              recognize that Assignee's obligation to immediately assume
              administrative accounting responsibilities for the Properties upon
              Closing may be impractical and will present certain difficulties
              for both Assignor and Assignee in regards to transfer of such
              administrative responsibilities, timely and proper revenue
              distributions, payment of expenses, joint interest billings and
              the rendition of post-closing settlement statements.

              Therefore, to facilitate a convenient and proper transfer of the
              administrative accounting responsibilities relating to the
              Properties, Assignor and Assignee agree the administrative duties
              will be transferred from the Assignor to the Assignee in the
              following manner:

                           (a) Revenue Distributions:

                           (1) Assignor shall retain the responsibility for
                  distribution of revenues attributable to production through
                  the end of the month of Closing. Such distribution shall be
                  conducted by Assignor for revenues received through Assignor's
                  sales cut-off during the second month following the month of
                  Closing.

                           (2) In the event Assignor should receive revenues
                  subsequent to the Assignor's cutoff for its last revenue
                  distribution, as described above, unless such revenues are for
                  production prior to the Effective Time, Assignor shall remit
                  such revenues to Assignee within five (5) business days, and
                  Assignee shall be responsible for distributing all such
                  amounts, including distributions to royalty owners.

                           (3) In the event Assignee should receive revenues for
                  production from the Properties for the production period prior
                  to Effective Time, Assignee shall remit such revenues, net of
                  severance taxes and royalties, to Assignor within five (5)
                  business days.

                                                                              12
<PAGE>   13


                           (4) It is understood that Assignor will not undertake
                  to change its distribution master files for purposes of the
                  above discussed revenue distributions subsequent to the
                  Closing Date, and any information on the Properties received
                  by Assignor related to master file changes subsequent to the
                  Closing Date will be remitted to the Assignee as soon as is
                  practical.

                            (b) Payment of Expenses and Joint Interest Billings:

                            (1) Assignor shall retain, subject to the terms
                  hereof, the responsibility for the payment of all invoices,
                  expenses and joint interest billings for such expenses, for
                  invoices received and vouchered attributable to production
                  through the end of the month of Closing, excepting COPAS or
                  other general and administrative expenses that the Assignor
                  has agreed hereunder shall not be charged to Assignee.

                           (2) In the event Assignor should receive invoices,
                  expenses and joint interest billings subsequent to the Closing
                  Date that are not administered under sub-paragraph (1)
                  immediately above, unless such matters are for periods prior
                  to the Effective Time (which shall be paid by Assignor),
                  Assignor shall remit such invoices, expenses and joint
                  interest billings to Assignee within five (5) business days,
                  and Assignee shall be responsible for payment thereof.

                            (3) Assignor acknowledges and agrees that it shall
                  retain the responsibility for paying and shall pay invoices,
                  expenses and joint interest billings attributable to the
                  period prior to the Effective Time, except to the extent such
                  expenses pertain to claims made by third parties that are
                  covered by the Assignee indemnity set forth in paragraph 13.
                  In the event Assignee should receive such invoices, expenses
                  and joint interest billings attributable to the period prior
                  to Effective Time, Assignee shall remit such invoices,
                  expenses and joint interest billings to Assignor within five
                  (5) business days and Assignor shall be responsible for
                  payment thereof.

          28. LIABILITY AND JURY WAIVERS.

              (a) LIMITATION ON LIABILITY. NO PARTY SHALL BE REQUIRED TO PAY OR
              BE LIABLE FOR INCIDENTAL, CONSEQUENTIAL, EXEMPLARY, PUNITIVE, OR
              INDIRECT DAMAGES (WHETHER OR NOT ARISING FROM ITS NEGLIGENCE) TO
              ANY OTHER PARTY REGARDING ANY DISPUTE ARISING OUT OF THIS
              AGREEMENT OR A CLAIM OF BREACH HEREOF. THIS PROVISION SHALL NOT
              DIMINISH OR AFFECT IN ANY WAY THE PARTIES' RIGHTS OR OBLIGATIONS
              UNDER ANY INDEMNITIES PROVIDED FOR IN THIS AGREEMENT.

              (b) WAIVER OF JURY TRIAL. EACH PARTY WAIVES, TO THE FULLEST EXTENT
              PERMITTED BY APPLICABLE LAW, ANY RIGHT IT MAY HAVE


                                                                              13
<PAGE>   14


              TO A TRIAL BY JURY IN RESPECT OF ANY SUIT, ACTION OR PROCEEDING
              RELATING TO THIS AGREEMENT.

          29. Termination Period. If the closing has not occurred on or before
              the Closing Date, this Agreement shall automatically terminate
              unless HSR and Patina agree in writing to an extension.

          30. Further Assurances. After Closing, HSR and Patina shall execute,
              acknowledge and deliver or cause to be executed, acknowledged and
              delivered such instruments, and shall take such other action as
              may be necessary or advisable to carry out their obligations under
              this Agreement and under any document, certificate or other
              instrument delivered pursuant hereto. Certain of the Properties
              may be subject to the terms of a Farmout Agreement dated March 18,
              1992, as amended, between Amoco Production Company and SOCO
              Wattenberg Corporation ("SOCO Wattenberg"). In general, if the
              Farmout is in effect and if SOCO Wattenberg conducts operations in
              compliance with the terms of the Farmout, SOCO Wattenberg has the
              right to earn a 99% working interest in certain formations and
              lands with HSR retaining a 1% working interest. If it is
              determined after Closing that the Farmout remains in effect and
              SOCO Wattenberg conducts operations such that it may earn a 99%
              interest in a formation under the Farmout, HSR agrees to assign to
              SOCO Wattenberg its retained 1% interest in that formation as to
              the lands earned pursuant to the Farmout.

          31. Tax Credits. The parties agree to cooperate with one another and
              coordinate the unwinding or transfer prior to Closing of the
              monetization of section 29 tax credits pertaining to the
              Properties being assigned by Assignor hereunder. As set forth in
              paragraph 10 above, the Effective Time for such tax credits shall
              be deemed to be September 1, 1999 at 7:00 a.m.

          32. Correction Assignment. HSR previously assigned to Patina certain
              1% working interests held by HSR in numerous properties, some of
              which are included in the exchange contemplated by this Agreement.
              The parties have disagreed as to the interpretation of that
              assignment as it relates to certain formations in the leases
              assigned. HSR and Patina agree prior to Closing that a corrective
              assignment will be made and recorded as part of the closing
              documents hereunder which clarifies that the Dakota formation and
              other formations in some instances were not intended to be covered
              by the original assignment and that any rights held by HSR in
              these formation are reconveyed to HSR. The original assignment was
              intended to convey a wellbore interest in the described wells in
              certain formations in which HSR's working interest was limited to
              a 1% working interest acquired from Amoco. The corrective
              assignment shall correct the original assignment to reflect this
              intent. To the extent that HSR after Closing would still own a 1%
              working interest in the leasehold associated with the wells
              included in either the original or corrective assignments and such
              leasehold is not included in the exchange contemplated by this
              Agreement, HSR will promptly and in good faith assign and convey
              to Patina all of HSR's right, title and interest in and to the oil
              and gas leases covered and included in the original


                                                                              14
<PAGE>   15


              assignment covering the formations in which HSR owns only a 1%
              working interest as of the Closing Date.

          33. TCW Interest. TCW DR II Royalty Partnership, a California limited
              partnership, holds an overriding royalty interest in certain of
              the Patina Purchase Wells. An assignment of this interest as to
              some of such Properties is not recorded in the county records.
              Prior to Closing, HSR will execute and record a corrective
              assignment that properly evidences of record the interest of TCW
              in the Patina Purchase Properties. The interest conveyed to TCW
              will not reduce or diminish the net revenue interest of Patina in
              the affected Patina Purchase Well as such interest is set forth on
              Exhibits B-1, B-2, or B-3, as appropriate.

          34. Amendment. This Agreement may be amended only by written
              instrument executed by both HSR and Patina.

          35. Brokers. Each party hereto indemnifies the other against any
              liability or expense for brokerage fees, finder's fees, agent's
              commissions or other similar forms of compensation incurred by the
              indemnifying party in connection with this Agreement or any
              transaction contemplated hereby.

          36. Expenses. Each party shall be solely responsible for expenses
              incurred in connection with this Agreement and shall not be
              entitled to reimbursement by the other party.

          37. Survival. The terms of this Agreement shall survive closing and
              will not merge with any conveyance. The covenants, conditions, and
              other provisions of those paragraphs shall endure and, as to the
              Wells, shall run with the Land. They shall not be extinguished by
              the doctrine of merger by deed or any similar doctrine and no
              waiver, release, or forbearance of the application of the
              provisions of those paragraphs in any given circumstance shall
              operate as a waiver, release, or forbearance of the provisions of
              the paragraphs as to any other circumstance.

          38. Notices. All notices which are required or may be given pursuant
              to this Agreement shall be given in writing and delivered
              personally or by registered or certified mail, postage prepaid to
              the addresses of the parties first set forth above. All notices
              shall be deemed to have been given as of the date of receipt.

          39. Entire Agreement. This Agreement constitutes the entire Agreement
              between the parties hereto and supersedes all prior agreements,
              negotiations, and understandings.

          40. Governing Law. This Agreement shall be interpreted in accordance
              with the laws of the state of Colorado.

          41. Press Release. Prior to Closing and for a period of thirty (30)
              days following Closing, neither party shall make any press
              release or other announcement in connection with this Agreement
              without first consulting with the other party. Following such


                                                                              15
<PAGE>   16


              consultation and good faith attempt to make reasonable
              accommodations, for press releases or other announcements made
              after Closing, if the parties are unable in good faith to agree on
              the content of the press release or announcement, either party may
              make any announcement or press release that it so desires. This
              provision shall not apply to any filing with any governmental body
              or stock exchange required by law, rule or regulation.



HS RESOURCES, INC.



- -----------------------------------
Dale E. Cantwell
Vice President



PATINA OIL & GAS CORPORATION



- -----------------------------------
Brian J. Cree
Executive Vice President

                                                                              16

<TABLE> <S> <C>

<ARTICLE> 5

<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               SEP-30-1999
<CASH>                                       3,943,280
<SECURITIES>                                         0
<RECEIVABLES>                               67,612,172
<ALLOWANCES>                                         0
<INVENTORY>                                    874,047
<CURRENT-ASSETS>                            77,552,645
<PP&E>                                     983,836,620
<DEPRECIATION>                             222,464,686
<TOTAL-ASSETS>                             851,662,471
<CURRENT-LIABILITIES>                       89,070,496
<BONDS>                                    539,417,482
                                0
                                          0
<COMMON>                                        19,528
<OTHER-SE>                                 160,731,362
<TOTAL-LIABILITY-AND-EQUITY>               851,662,471
<SALES>                                    149,154,651
<TOTAL-REVENUES>                           156,888,265
<CGS>                                       31,441,918
<TOTAL-COSTS>                               85,657,125
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                          31,657,020
<INCOME-PRETAX>                              8,132,202
<INCOME-TAX>                                 3,098,369
<INCOME-CONTINUING>                          5,033,833
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                 5,033,833
<EPS-BASIC>                                       0.27
<EPS-DILUTED>                                     0.27


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