PETROGLYPH ENERGY INC
8-K/A, 1999-11-03
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>   1

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                               ------------------

                                   FORM 8-K/A

                               ------------------

                                 CURRENT REPORT

                                 AMENDMENT NO. 1


     PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

        Date of Report (Date of earliest event reported): AUGUST 18, 1999


                             PETROGLYPH ENERGY, INC.
              (Exact name of registrant as specified in is charter)

                        Commission File Number: 000-23185

<TABLE>
<S>                                                          <C>
                DELAWARE                                         74-2826234
             (State or other                                  (I.R.S. Employer
             jurisdiction of                                 Identification No.)
             incorporation)



              1302 N. GRAND
           HUTCHINSON, KANSAS                                       67501
(Address of principal executive offices)                         (Zip Code)
</TABLE>


                                 (316) 665-8500
              (Registrant's telephone number, including area code)


<PAGE>   2


                                 AMENDMENT NO. 1

Amend Item 7. Financial Statements and Exhibits by deleting such item in its
entirety and substituting therefore the following:

         (a)      Financial Statements of Businesses Acquired.

                  Report of Independent Public Accountants
                  Audited Statements of Revenues and Direct Operating Expenses
                    for the Years Ended December 31, 1998, 1997, and 1996
                  Notes to Statements of Revenues and Direct Operating Expenses

         (b)      Pro Forma Financial Information.

                  Unaudited Pro Forma Consolidated Balance Sheet as of
                    June 30, 1999
                  Unaudited Pro Forma Consolidated Statements of Operations
                    for the Year Ended December 31, 1998 and the Six Months
                    Ended June 30, 1999
                  Notes to Unaudited Pro Forma Consolidated Financial Statements

         (c)      Exhibits.

         None.


                                       2
<PAGE>   3



          REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS


         To the Board of Directors of Petroglyph Energy, Inc.:

         We have audited the accompanying statements of revenues and direct
         operating expenses of the Antelope Creek Acquisition as described in
         Note 1 for the years ending December 31, 1998, 1997, and 1996. These
         statements are the responsibility of the management of Petroglyph
         Energy, Inc. (the "Company"). Our responsibility is to express an
         opinion on these statements based on our audit.

         We conducted our audit in accordance with general accepted auditing
         standards. Those standards require that we plan and perform the audit
         to obtain reasonable assurance about whether the statements of revenues
         and direct operating expenses are free of material misstatement. An
         audit includes examining, on a test basis, evidence supporting the
         amounts and disclosures in the statements of revenues and direct
         operating expenses. An audit also includes assessing the accounting
         principles used and significant estimates made by management, as well
         as evaluating the overall presentation of the statements of revenues
         and direct operating expenses. We believe that our audit provides a
         reasonable basis for our opinion.

         The accompanying statements of revenues and direct operating expenses
         were prepared for the purpose of complying with the rules and
         regulations of the Securities and Exchange Commission as described in
         Note 1 and are not intended to be a complete presentation of the
         Company's revenues and expenses.

         In our opinion, the statements of revenues and direct operating
         expenses referred to above present fairly, in all material respects,
         the revenues and direct operating expenses of the Antelope Creek
         Acquisition as described in Note 1 for the years ended December 31,
         1998, 1997, and 1996 in conformity with generally accepted accounting
         principles.


         ARTHUR ANDERSEN LLP

         Dallas, Texas
         November 1, 1999


                                       3
<PAGE>   4

                           ANTELOPE CREEK ACQUISITION
              STATEMENTS OF REVENUES AND DIRECT OPERATING EXPENSES
                               FOR THE YEARS ENDED

<TABLE>
<CAPTION>
                                        December 31,   December 31,   December 31,
                                           1998           1997           1996
                                        -----------    -----------    -----------
<S>                                     <C>            <C>            <C>
REVENUES
     Oil                                $2,221,828     $3,225,609     $1,463,599
     Gas                                   937,205        834,603        251,481
                                        ----------     ----------     ----------
        Total                            3,159,033      4,060,212      1,715,080
                                        ----------     ----------     ----------

DIRECT OPERATING EXPENSES
     Lease operating expense             1,736,881      1,364,814        533,166
     Severance taxes                       170,715        169,268         70,328
                                        ----------     ----------     ----------
        Total                            1,907,596      1,534,082        603,494
                                        ----------     ----------     ----------

     EXCESS OF REVENUES OVER
        DIRECT OPERATING EXPENSES       $1,251,437     $2,526,130     $1,111,586
                                        ==========     ==========     ==========
</TABLE>

See Accompanying Notes to Statements of Revenues and Direct Operating Expenses.


                                       4
<PAGE>   5

                           ANTELOPE CREEK ACQUISITION

         NOTES TO STATEMENTS OF REVENUES AND DIRECT OPERATING EXPENSES

         1.       BASIS OF PRESENTATION

         Antelope Creek Acquisition

         On August 20, 1999, Petroglyph Energy, Inc. (the "Company") acquired
         the remaining 50% working interest in the Antelope Creek Field in the
         Uinta Basin of Utah (the "Antelope Creek Property") from its
         non-operated working interest partner, Williams Production Rocky
         Mountain Company ("Williams"), for a purchase price of $6.9 million
         (the "Antelope Creek Acquisition"). The Antelope Creek Acquisition,
         which was effective August 1, 1999, gives the Company a 100% working
         interest in the Antelope Creek Property.

         In order to finance the Antelope Creek Acquisition, the Company
         borrowed $2.5 million on an existing revolving credit facility with The
         Chase Manhattan Bank ("Chase") pursuant to Amendment No. 1 dated as of
         August 20, 1999 to the Second Amended and Restated Credit Agreement by
         and between the Company and Chase dated as of September 30, 1998.

         Additionally, the Company sold $5 million of 8% senior subordinated
         notes due 2004 (the "Notes") to Intermountain Industries, Inc., an
         Idaho corporation ("Intermountain"). The Notes required the Company to
         deliver to Intermountain a stock purchase warrant to acquire 150,000
         shares of Common Stock of the Company at an exercise price of $3.00 per
         share and the ability for Intermountain to obtain additional stock
         purchase warrants over the life of the Notes. The number of future
         stock purchase warrants will be based on the future stock price
         performance and the amount and duration of the Notes outstanding. The
         maximum number of shares of Common Stock issuable under the stock
         purchase warrants for any given period is limited to 250,000 shares in
         any one year, 400,000 over the first three years and 750,000 over the
         five-year life of the notes. The Company may redeem the Notes at par
         without penalty at any time. Upon redemption of the Notes, any
         remaining unissued and unearned stock purchase warrants will expire.
         The Company utilized proceeds from the Notes to finance the remaining
         purchase price of the Antelope Creek Acquisition and for working
         capital needs.

         The accompanying statements of revenues and direct operating expenses
         do not include general and administrative expense, interest income or
         expense, a provision for depreciation, depletion and amortization or
         any provision for income taxes because the property interests acquired
         represent only a portion of a business and the costs incurred by
         Williams are not necessarily indicative of the costs to be incurred by
         the Company.

         Historical financial information reflecting financial position, results
         of operations and cash flows of the Antelope Creek Acquisition is not
         presented because the entire acquisition cost was assigned to the oil
         and gas property interests. Accordingly, the historical statements of
         revenues and direct operating expenses have been presented in lieu of
         the financial statements required under Rule 3-05 of Securities and
         Exchange Commission Regulation S-X.


         2.       SUPPLEMENTAL OIL AND GAS RESERVE INFORMATION (UNAUDITED)

         Estimated Quantities of Proved Oil and Gas Reserves

         Reserve information presented below has been estimated by the Company's
         internal engineers using June 30, 1999 prices and costs. Proved
         reserves are estimated quantities of crude oil and natural gas which,
         based on geologic and engineering data, are estimated to be reasonably
         recoverable in future years from known reservoirs under existing
         economic and operating conditions. Proved developed reserves are those
         which are expected to be recovered through existing wells with existing
         equipment and operating methods. Because of inherent uncertainties


                                       5
<PAGE>   6

         and the limited nature of reservoir data, such estimates are subject to
         change as additional information becomes available.

<TABLE>
<S>                                                  <C>               <C>
         Proved Oil and Gas Reserves at
           June 30, 1999                             Oil (Bbls)        Gas (Mcf)

                  Proved reserves                    8,148,000         14,736,000
                                                     =========         ==========

                  Proved developed reserves          4,708,000          8,865,000
                                                     =========         ==========
</TABLE>


         Standardized Measure of Discounted Future Net Cash Flows Relating to
         Proved Oil and Gas Reserves

         The standardized measure of discounted future net cash flows
         ("Standardized Measure") is prepared using assumptions required by the
         Financial Accounting Standards Board. Such assumptions include the use
         of period-end prices for oil and gas and period-end costs for estimated
         future development and production expenditures to produce period-end
         estimated proved reserves. Discounted future net cash flows are
         calculated using a 10% rate.

         The Standardized Measure does not represent the Company's estimate of
         future net cash flows or the value of proved oil and gas reserves.
         Probable and possible reserves, which may become proved in the future,
         are excluded from the calculations. Furthermore, period-end prices,
         used to determine the Standardized Measure, are influenced by seasonal
         demand and other factors and may not be the most representative in
         estimating future reserves or reserve data.

         June 30, 1999 weighted average oil price used in the estimation of
         proved reserves and calculation of the Standardized Measure was $15.75.
         June 30, 1999 weighted average gas price was $2.32 per Mcf.

         Standardized Measure of Discounted Future Net Cash Flows at June 30,
         1999

<TABLE>
<CAPTION>
                                                             (in thousands)
<S>                                                          <C>
                  Future cash inflows                         $  164,253
                  Future costs:
                    Production                                   (29,873)
                    Development                                  (20,828)
                                                              ----------
                  Future net cash inflows                        113,552
                  10% annual discount                            (61,654)
                                                              ----------
                  Standardized measure of discounted future
                    Net cash flows before income taxes        $   51,898
                                                              ==========
</TABLE>


                                       6
<PAGE>   7

                             PETROGLYPH ENERGY, INC.

         PRO FORMA CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

         The accompanying Pro Forma Consolidated Financial Statements have been
         prepared by recording pro forma adjustments to the historical
         consolidated financial statements of Petroglyph Energy, Inc. ("the
         Company"). The Pro Forma Consolidated Balance Sheet as of June 30, 1999
         has been prepared as if the Antelope Creek Acquisition (as described in
         Note 2) was consummated on January 1, 1998. The Pro Forma Consolidated
         Statements of Operations for the year ended December 31, 1998 and for
         the six months ended June 30, 1999 have been prepared as if the
         Antelope Creek Acquisition (as described in Note 2) was consummated on
         January 1, 1998.

         The Pro Forma Consolidated Financial Statements are not necessarily
         indicative of the financial position or results of operations that
         would have occurred had the transactions been effected on the assumed
         date. Additionally, future results may vary significantly from the
         results reflected in the Pro Forma Consolidated Statements of
         Operations due to normal production declines, changes in prices, future
         transactions and other factors. These statements should be read in
         conjunction with the Company's 1998 Form 10-K, the Company's
         consolidated financial statements and the related notes for the six
         months ended June 30, 1999 included in the Company's Form 10-Q for the
         quarter ended June 30, 1999 and the statements of revenues and direct
         operating expenses of the Antelope Creek Acquisition for the years
         ended December 31, 1998, 1997, and 1996.


                                       7
<PAGE>   8
                             PETROGLYPH ENERGY, INC.
                      PRO FORMA CONSOLIDATED BALANCE SHEET
                               AS OF JUNE 30, 1999
                                   (UNAUDITED)

<TABLE>
<CAPTION>
                                                                                       PRO FORMA
                                                                     HISTORICAL       ADJUSTMENTS             PRO FORMA
                                                                    ------------      ------------           ------------
<S>                                                                 <C>               <C>                    <C>
        ASSETS
Current Assets:
    Cash and cash equivalents                                       $    946,563      $  1,131,011 (1)       $  2,077,574
    Accounts receivable:
        Oil and Gas Sales                                                278,556                --                278,556
        Other                                                             39,111                --                 39,111
                                                                    ------------      ------------           ------------
          Total Accounts Receivable                                      317,667                --                317,667
    Inventory                                                          1,500,863                --              1,500,863
    Prepaid expenses and Other Current Assets                            164,822                --                164,822
                                                                    ------------      ------------           ------------
        Total Current Assets                                           2,929,915         1,131,011              4,060,926
                                                                    ------------      ------------           ------------

Property and Equipment, Successful efforts method at cost:
    Proved properties                                                 31,913,848         6,900,000 (2)         38,813,848
    Unproved properties                                               10,644,854                --             10,644,854
    Pipelines, gathering and other                                    10,360,832                --             10,360,832
                                                                    ------------      ------------           ------------
                                                                      52,919,534         6,900,000             59,819,534
    Less: accumulated depreciation, depletion, and amortization      (11,677,217)         (836,358)(3)        (12,513,575)
                                                                    ------------      ------------           ------------
        Property and equipment, net                                   41,242,317         6,063,642             47,305,959
                                                                    ------------      ------------           ------------
Note receivable from officers                                            246,500                --                246,500
Other assets, net                                                        211,879                --                211,879
                                                                    ------------      ------------           ------------
          Total Assets                                              $ 44,630,611      $  7,194,653           $ 51,825,264
                                                                    ============      ============           ============

        LIABILITIES AND STOCKHOLDERS' EQUITY
Current Liabilities:
    Accounts payable and accrued liabilities:
        Trade                                                       $    297,419      $         --           $    297,419
        Oil and natural gas sales payable                                301,254                --                301,254
        Accrued taxes Payable                                            165,604                --                165,604
        Current portion of long-term debt                                     --                --                     --
        Other                                                            389,992                --                389,992
                                                                    ------------      ------------           ------------
          Total Current Liabilities                                    1,154,269                --              1,154,269
                                                                    ------------      ------------           ------------
Long-term debt                                                         8,000,000         6,802,350 (4)         14,802,350
Deferred Tax Liability - Long-term                                       360,858            95,054 (5)            455,912
Stockholders' equity:
    Common Stock, par value $.01 per share; 25,000,000 shares
       authorized; 5,458,333 shares issued and outstanding                54,583                --                 54,583
    Warrants outstanding                                                      --           139,500 (6)            139,500
    Paid-in-Capital                                                   46,134,018                --             46,134,018
    Retained Earnings (deficit)                                      (11,073,117)          157,749 (7)(8)     (10,915,368)
                                                                    ------------      ------------           ------------
          Total Stockholders' Equity                                  35,115,484           297,249             35,412,733
                                                                    ------------      ------------           ------------
          Total Liabilities and Stockholders' Equity                $ 44,630,611      $  7,194,653           $ 51,825,264
                                                                    ============      ============           ============
</TABLE>


See Accompanying Notes to Pro Forma Consolidated Financial Statements.


                                       8
<PAGE>   9

                             PETROGLYPH ENERGY, INC.
            PRO FORMA CONSOLIDATED CONDENSED STATEMENT OF OPERATIONS
                  FOR THE TWELVE MONTHS ENDED DECEMBER 31, 1998

<TABLE>
<CAPTION>
                                                                          PRO FORMA
                                                        HISTORICAL        ADJUSTMENTS             PRO FORMA
                                                       ------------      ------------            ------------
                                                        (Audited)         (Unaudited)             (Unaudited)
<S>                                                    <C>               <C>                     <C>
Operating Revenues:
     Oil sales                                         $  2,912,293      $  2,221,828 (1)        $  5,134,121
     Natural gas sales                                    1,365,850           937,205 (1)           2,303,055
     Other                                                  189,924                --                 189,924
                                                       ------------      ------------            ------------
         Total operating revenues                         4,468,067         3,159,033               7,627,100
                                                       ------------      ------------            ------------

Operating Expenses:
     Lease operating                                      1,927,334         1,736,881 (1) (5)       3,664,215
     Production taxes                                       218,129           170,715 (1)             388,844
     Exploration Costs                                      192,526                --                 192,526
     Depreciation, depletion, and amortization            1,866,111           619,529 (2)           2,485,640
     Impairments                                          4,848,218                --               4,848,218
     General and administrative                           2,128,774           236,438 (5)           2,365,212
                                                       ------------      ------------            ------------
         Total operating expenses                        11,181,092         2,763,563              13,944,655
                                                       ------------      ------------            ------------

Operating Gain (Loss)                                    (6,713,025)          395,470              (6,317,555)
                                                       ------------      ------------            ------------

Other Income (Expenses):
     Interest Income (expense), net                         406,975          (579,900)(3) (4)        (172,925)
     Gain (loss) on sales of property & equip, net           58,577                --                  58,577
                                                       ------------      ------------            ------------
Net income (loss) before income taxes                    (6,247,473)         (184,430)             (6,431,903)
                                                       ------------      ------------            ------------
Income Tax Expense (Benefit):
        Current                                                  --                --                      --
        Deferred                                         (2,061,666)          (69,346)(6)          (2,131,012)
                                                       ------------      ------------            ------------
         Total income tax (benefit) expense              (2,061,666)          (69,346)             (2,131,012)
                                                       ------------      ------------            ------------
Net Income (Loss)                                      $ (4,185,807)     $   (115,084)           $ (4,300,891)
                                                       ============      ============            ============
</TABLE>


See Accompanying Notes to Pro Forma Consolidated Financial Statements


                                       9
<PAGE>   10

                             PETROGLYPH ENERGY, INC.
            PRO FORMA CONSOLIDATED CONDENSED STATEMENT OF OPERATIONS
                     FOR THE SIX MONTHS ENDED JUNE 30, 1999
                                   (UNAUDITED)

<TABLE>
<CAPTION>
                                                                                     PRO FORMA
                                                                    HISTORICAL       ADJUSTMENTS             PRO FORMA
                                                                    -----------      -----------            -----------
<S>                                                                 <C>              <C>                    <C>
Operating Revenues:
     Oil sales                                                      $ 1,219,964      $   946,342 (1)        $ 2,166,306
     Natural gas sales                                                  625,039          324,424 (1)            949,463
     Other                                                              140,525               --                140,525
                                                                    -----------      -----------            -----------
         Total operating revenues                                     1,985,528        1,270,766              3,256,294
                                                                    -----------      -----------            -----------

Operating Expenses:
     Lease operating                                                    950,754          774,990 (1) (5)      1,725,744
     Production taxes                                                    99,997           94,818 (1)            194,815
     Depreciation, depletion, and amortization                          824,633          216,829 (2)          1,041,462
     General and administrative                                         904,366           64,446 (5)            968,812
                                                                    -----------      -----------            -----------
         Total operating expenses                                     2,779,750        1,151,083              3,930,833
                                                                    -----------      -----------            -----------

Operating Gain (Loss)                                                  (794,222)         119,683               (674,539)
                                                                    -----------      -----------            -----------

Other Income (Expenses):
     Interest Income (expense), net                                    (196,782)        (289,950)(3) (4)       (486,732)
     Gain (loss) on sales of property & equip, net                      876,842          607,500 (6)          1,484,342
                                                                    -----------      -----------            -----------
Net income (loss) before income taxes                                  (114,162)         437,233                323,071
                                                                    -----------      -----------            -----------
Income Tax Expense (Benefit):
        Current                                                              --               --                     --
        Deferred                                                        (29,085)         164,400 (7)            135,315
                                                                    -----------      -----------            -----------
         Total income tax (benefit) expense                             (29,085)         164,400                135,315
                                                                    -----------      -----------            -----------
Net Income (Loss) Before Change in Accounting Principles:           $   (85,077)     $   272,833            $   187,756
     Accounting Change - Expense of Start Up Costs (net of tax)        (111,190)              --               (111,190)
                                                                    -----------      -----------            -----------
Net Income (Loss)                                                   $  (196,267)     $   272,833            $    76,566
                                                                    ===========      ===========            ===========
</TABLE>


See Accompanying Notes to Pro Forma Consolidated Financial Statements


                                       10
<PAGE>   11

                             PETROGLYPH ENERGY, INC.
        NOTES TO PRO FORMA CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

         1.       BASIS OF PRESENTATION

         The accompanying Pro Forma Consolidated Balance Sheet at June 30, 1999
         and the Pro Forma Consolidated Statements of Operations for the year
         ended December 31, 1998 and the six months ended June 30, 1999 have
         been prepared assuming that Petroglyph Energy, Inc. ("the Company")
         consummated the Antelope Creek Acquisition (see Note 2) on January 1,
         1998. The Pro Forma Consolidated Statements of operations are not
         necessarily indicative of the results of operations had the
         above-described transactions occurred on the assumed date.

         2.       ACQUISITION

         On August 20, 1999, the Company acquired the remaining 50% working
         interest in the Antelope Creek Field in the Uinta Basin of Utah (the
         "Antelope Creek Property") from its non-operated working interest
         partner, Williams Production Rocky Mountain Company ("Williams"), for a
         purchase price of $6.9 million (the "Antelope Creek Acquisition"). The
         Antelope Creek Acquisition, which was effective August 1, 1999, gives
         the Company a 100% working interest in the Antelope Creek Property.

         In order to finance the Antelope Creek Acquisition, the Company
         borrowed $2.5 million on an existing revolving credit facility with The
         Chase Manhattan Bank ("Chase") pursuant to Amendment No. 1 dated as of
         August 20, 1999 to the Second Amended and Restated Credit Agreement by
         and between the Company and Chase dated as of September 30, 1998.

         Additionally, the Company sold $5 million of 8% senior subordinated
         notes due 2004 (the "Notes") to Intermountain. The Notes required the
         Company to deliver to Intermountain a stock purchase warrant to acquire
         150,000 shares of Common Stock of the Company at an exercise price of
         $3.00 per share and the ability for Intermountain to obtain additional
         stock purchase warrants over the life of the Notes. The number of
         future stock purchase warrants will be based on the future stock price
         performance and the amount and duration of the Notes outstanding. The
         maximum number of shares of Common Stock issuable under the stock
         purchase warrants for any given period is limited to 250,000 shares in
         any one year, 400,000 over the first three years and 750,000 over the
         five-year life of the notes. The Company may redeem the Notes at par
         without penalty at any time. Upon redemption of the Notes, any
         remaining unissued and unearned stock purchase warrants will expire.
         The Company utilized proceeds from the Notes to finance the remaining
         purchase price of the Antelope Creek Acquisition and for working
         capital needs.

         3.       PRO FORMA ADJUSTMENTS

         The following are notes to the Pro Forma Consolidated Balance Sheet
         dated June 30, 1999:

         (1)      To reflect pro forma cash flows from January 1, 1998 through
                  June 30, 1999:

<TABLE>
                  <S>                                       <C>
                  Oil and natural gas sales                 $ 4,429,799
                  Production taxes                             (265,533)
                  LOE & G&A expenses                         (2,812,755)
                  Interest expense                             (828,000)
                  Sale of equipment                             607,500
                                                            -----------
                      Net cash                              $ 1,131,011
                                                            -----------
</TABLE>

         (2)      The purchase price of the additional 50% working interest in
                  the Antelope Creek Field.

         (3)      Depreciation, depletion, and amortization expense for 18
                  months attributable to the Antelope Creek Acquisition.

         (4)      Additional borrowings to finance the Antelope Creek
                  Acquisition.


                                       11
<PAGE>   12

         (5)      Income tax expense of $164,400 for six months of 1999 less
                  $69,346 tax benefit from the net loss in 1998 from operations
                  of the Antelope Creek Acquisition.

         (6)      To reflect the calculated value of a warrant to purchase
                  150,000 shares of Common Stock granted on the sale of Notes.

         (7)      To reflect the net loss (after income tax benefit) from
                  operations of the Antelope Creek Acquisition for 1998.

         (8)      To reflect the net income (after income tax expense) from
                  operations of the Antelope Creek Acquisition for the first six
                  months of 1999.


         The following are notes to the Pro Forma Consolidated Statement of
         Operations dated December 31, 1998:

         (1)      To add oil and natural gas revenues and volumes, production
                  taxes, and operating expenses attributable to the Antelope
                  Creek Acquisition for the period January 1, 1998 through
                  December 31, 1998.

         (2)      To reflect depreciation, depletion, and amortization expense
                  on the Antelope Creek Field as if the Company had owned a 100%
                  working interest for all of 1998.

         (3)      To add interest expense related to the debt required to
                  purchase the additional 50% of the Antelope Creek Field:
                  $6,900,000 at 8% interest outstanding for all of 1998.

         (4)      Includes $27,900 amortization of $139,500 calculated value of
                  a warrant to purchase 150,000 shares of Common Stock granted
                  on the sale of Notes.

         (5)      To reflect the increase in general and administrative expense
                  and decrease in lease operating expense resulting from owning
                  100% of the Antelope Creek Field and billing no overhead and
                  service income fees to third parties.

         (6)      The pro forma tax expense was computed at a combined rate of
                  37.6%.


         The following are notes to the Pro Forma Consolidated Statement of
         Operations dated June 30, 1999:

         (1)      To add oil and natural gas revenues and volumes, production
                  taxes, and operating expenses attributable to the Antelope
                  Creek Acquisition for the period January 1, 1999 through June
                  30, 1999.

         (2)      To reflect depreciation, depletion, and amortization expense
                  on the Antelope Creek Field as if the Company had owned a 100%
                  working interest for the first six months of 1999.

         (3)      To add interest expense related to the debt required to
                  purchase the additional 50% of the Antelope Creek Field:
                  $6,900,000 at 8% interest outstanding for the first six months
                  of 1999.

         (4)      Includes $13,950 amortization of $139,500 calculated value of
                  a warrant to purchase 150,000 shares of Common Stock granted
                  on the sale of Notes.

         (5)      To reflect the increase in general and administrative expense
                  and decrease in lease operating expense resulting from owning
                  100% of the Antelope Creek Field and billing no overhead and
                  service income fees to third parties.

         (6)      To reflect the sale of equipment in the first half of 1999
                  attributable to the Antelope Creek Acquisition.

         (7)      The pro forma tax expense was computed at a combined rate of
                  37.6%.


                                       12
<PAGE>   13


                                   SIGNATURES

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


Date: November 1, 1999          PETROGLYPH ENERGY,  INC.


                                By:   /s/ Robert C. Murdock
                                      ------------------------------------------
                                      Robert C. Murdock, President and
                                      Chief Executive Officer


                                By:   /s/ Tim A. Lucas
                                      ------------------------------------------
                                      Tim A. Lucas, Vice-President and
                                      Chief Financial Officer


                                       13


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