MALLON RESOURCES CORP
SC 13D, 1996-12-24
CRUDE PETROLEUM & NATURAL GAS
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13D


                    Under the Securities Exchange Act of 1934


                             MALLON RESOURCES CORP.
- -------------------------------------------------------------------------------
                                (Name of Issuer)

                         Common Stock, $0.01 Par Value
- -------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    561240201
- -------------------------------------------------------------------------------
                                 (CUSIP NUMBER)

                          CAMBRIDGE INVESTMENTS LIMITED
                              600 Montgomery Street
                                   27th Floor
                         San Francisco, California 94111
                            Tel. No.: (415) 627-3017
- -------------------------------------------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                               - with copies to -

                           Michael G. Tannenbaum, Esq.
              Newman Tannenbaum Helpern Syracuse & Hirschtritt LLP
                          900 Third Avenue - 13th Floor
                            New York, New York 10022
                                 (212) 508-6700

                                October 17, 1996
- -------------------------------------------------------------------------------
             (Date of event which requires filing of this statement)


If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4) check the following box [ ]

Check the following box if a fee is being paid with the statement [ ]

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934, as amended ("Act") or otherwise subject to the liabilities of that section
of the Act but shall be subject to all other provisions of the Act.

                                Page 1 of 8 Pages

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 ------------------------                             ------------------------
|   CUSIP NO.561240201   |           13D            |                         |
 ------------------------                             -----------------------


- -------------------------------------------------------------------------------
    1      NAME OF REPORTING PERSONS
           S.S OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

           Cambridge Investments Limited
- ------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*    (a)  [ ] 
                                                                (b)  [ ] 
- ------------------------------------------------------------------------------
    3      SEC USE ONLY
- ------------------------------------------------------------------------------
    4      SOURCE OF FUNDS*
           OO
- ------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED 
           PURSUANT TO ITEM 2(d) OR 2(e)                             [ ] 
            
- ------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION
           U.S.A.
- ------------------------------------------------------------------------------
  NUMBER OF    |  7  |   SOLE VOTING POWER
   SHARES      |     |        453,800 shares of Common Stock (See Item 5)
BENEFICIALLY   |     |
  OWNED BY     |  8  |   SHARED VOTING POWER    
   EACH        |     |        15,000
 REPORTING     |     |
PERSON WITH    |  9  |   SOLE DISPOSITIVE POWER
               |     |        453,800 shares of Common Stock (See Item 5.)
               |     |
               | 10  |   SHARED DISPOSITIVE POWER
               |     |        15,000
- ------------------------------------------------------------------------------
   11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
          468,800 shares of Common Stock (See Item 5.)
- ------------------------------------------------------------------------------
   12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
          CERTAIN SHARES*                                           [ ]
- ------------------------------------------------------------------------------
   13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

          10.7% of Common Stock (See Item 5)
- ------------------------------------------------------------------------------
   14     TYPE OF REPORTING PERSON*
          IA
- ------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                Page 2 of 8 Pages

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                                  SCHEDULE 13D


     This Schedule 13D is being filed on behalf of Cambridge Investments
Limited, a California corporation, registered as an investment advisor in the
State of California, regarding shares of Mallon Resources Corp. acquired on
behalf of certain of its clients.

Item 1. Security and Issuer

        Securities acquired:  Common Stock, $0.01 par value

        Issuer:       Mallon Resources Corp.
                      999 18th Street, Suite 1700
                      Denver, Colorado 80202
                      Tel. No. (303) 293-2333


Item 2. Identity and Background

     Cambridge Investments Limited, a California corporation ("Cambridge"), is
registered as an investment advisor in the State of California and provides
investment management services to private individuals and institutions.
Cambridge's contracts with its clients generally provide that Cambridge is
responsible for designing and implementing the client's overall investment
strategy; for conducting direct portfolio management strategies to the extent
Cambridge determines that it is appropriate to utilize its own portfolio
management capabilities. Cambridge is located at 600 Montgomery Street, San
Francisco, California 94111. Cambridge has not been convicted in a criminal
proceeding during the last five (5) years. Cambridge is not, and during the past
five (5) years was not, a party to a civil proceeding of a judicial or
administrative body of competent jurisdiction and as a result thereof, subject
to any judgment, decree or final order enjoining future violations of, or
prohibiting or mandating activities subject to, federal or state securities laws
or finding any violation with respect to such laws.

     Mr. John R. Tozzi ("Mr. Tozzi") is the sole shareholder, director and
principal of Cambridge. His business address is 600 Montgomery Street, San
Francisco, California 94111. Mr. Tozzi's principal occupation is investment
management and he is a United States citizen. During the past five years, Mr.
Tozzi has not been (a) convicted in a criminal proceeding, or (b) a party to any
civil proceeding as a result of which he has been subject to any judgment,
decree or final order enjoining future violations of, or prohibiting or
mandating activities subject to federal or state securities laws or finding any
violation with respect to such laws.



                              Page 3 of 8 Pages

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Item 3. Source and Amount of Funds

     Cambridge, through both Cambridge Energy, L.P. ("CELP") and Cambridge
Energy Fund International Ltd. ("CEF") (collectively, the "Funds"), has invested
approximately $2,088,580 in Common Stock of the Issuer as described in Item 5
below. CELP and CEF have invested approximately $1,130,073.24 and $958,506.76,
respectively. The source of these funds was the respective working capital of
each of the Funds. Mr. Tozzi has invested directly approximately $984,061 in
Common Stock of the Issuer as described in Item 5 below.


Item 4. Purpose of the Transaction

     Cambridge and Mr. Tozzi have acquired shares of Common Stock reported in
Item 5(c) hereof over the last sixty (60) days, and prior thereto, for portfolio
investment purposes only, and do not have any present plans or proposals that
relate to or would result in any change in the business, policies, management,
structure or capitalization of the Issuer. Cambridge and Mr. Tozzi reserve the
right to acquire, or dispose of, additional securities of the Issuer or any of
its securities in the ordinary course of business, to the extent deemed
advisable in light of their general investment and trading policies, market
conditions or other factors. The Issuer may from time to time contact large
shareholders with a view towards discussing the acquisition of their shares.
Other than as described above, Cambridge and Mr. Tozzi do not have plans or
proposals which would result in any of the following:

     1) the acquisition by any person of additional securities of the Issuer, or
        the disposition of securities of the Issuer;

     2) an extraordinary corporate transaction, such as a merger, reorganization
        or liquidation, involving the Issuer or any of its subsidiaries;

     3) a sale or transfer of a material amount of assets of the Issuer or any
        of its subsidiaries;

     4) any change in the present board of directors or management of the
        Issuer, including any plans or proposals to change the number or term of
        directors or to fill any vacancies on the board;

     5) any material change in the present capitalization or dividend policy of
        the Issuer;

     6) any other material change in the Issuer's business or corporate
        structure;

     7) changes in the Issuer's charter, by-laws or instruments corresponding
        thereto or other actions which may impede the acquisition of control of
        the Issuer by any person;


                                Page 4 of 8 Pages

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     8) causing a class of securities of the issuer to be delisted from a
        national securities exchange or to cease to be authorized to be quoted
        in an interdealer quotation system of a registered national securities
        association;

     9) causing a class of securities of the Issuer to become eligible for
        termination of registration pursuant to Section 12(g)(4) of the
        Exchange Act; or

    10) any action similar to any of those enumerated above.


Item 5. Interest in Securities of the Issuer

     (a) Cambridge is the beneficial owner of 313,800 shares of Common Stock, or
7.2% shares of the shares outstanding. Of the 313,800 shares of Common Stock
described above, (i) 173,900 are deemed beneficially owned by Cambridge in its
capacity as investment advisor for the institutional account of CELP; and (ii)
139,900 are deemed beneficially owned by Cambridge in its capacity as investment
advisor for the institutional account of CEF. In addition to the 313,800 shares
of Common Stock deemed beneficially owned by Cambridge, Mr. Tozzi, directly and
indirectly, may be deemed the beneficial owner of 155,000 shares of Common
Stock, or, in the aggregate, 3.5% shares of the shares outstanding.

     The number of shares beneficially owned by Cambridge and Mr. Tozzi, and the
percentage of outstanding shares represented thereby, have been computed in
accordance with Rule 13d-3 under the Exchange Act. The percentage of ownership
of Cambridge and Mr. Tozzi on December 9, 1996 is based on 4,383,617 outstanding
shares of Common Stock as reported in the Issuer's Quarterly Report on Form 10-Q
for the period ended September 30, 1996.

     (b) Cambridge has the sole power to vote and dispose of the shares of
Common Stock held for the institutional accounts of CELP and CEF mentioned
above. Mr. Tozzi has the sole power to vote and dispose of 140,000 of the shares
of Common Stock held by him. With regard to the remaining 15,000 shares of
Common Stock, Mr. Tozzi has shared power to vote or direct the vote, or to
dispose or direct the disposition of such shares. The 15,000 shares are owned by
a member of Mr. Tozzi's family.

     (c) The transactions in the Issuer's securities by Cambridge and Mr. Tozzi
over the last sixty (60) days are listed as Annex A attached hereto and made
apart hereof.

     (d) CEF and CELP, respectively,  have the right to participate in the
receipt of dividends from, or proceeds from the sale of securities held on
behalf of such funds.

     (e) Not Applicable.



                              Page 5 of 8 Pages

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Item 6. Contracts, Arrangement, Understandings or Relationships with Respect to
                  Securities of the Issuer

        Not Applicable.


Item 7. Material to be Filed as Exhibits

        Not Applicable


                              Page 6 of 8 Pages

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                                     ANNEX A

=========================================================================
  DATE         TRANS      SHARES       PRICE            ACCOUNT
               (A/D)                    ($)
- -------------------------------------------------------------------------
10/17/96         A        62,800      6.5000              CEF
- -------------------------------------------------------------------------
10/17/96         A        19,600      6.5000              CEF
- -------------------------------------------------------------------------
10/17/96         A        39,200      6.9128              CEF
- -------------------------------------------------------------------------
10/17/96         A        97,200      6.5000              CELP
- -------------------------------------------------------------------------
10/17/96         A        30,400      6.5000              CELP
- -------------------------------------------------------------------------
10/17/96         A        60,800      6.9128              CELP
- -------------------------------------------------------------------------
10/17/96         A        50,000       7.063         John R. Tozzi
- -------------------------------------------------------------------------
10/17/96         A        90,000       7.010         John R. Tozzi
- -------------------------------------------------------------------------
10/17/96         A        15,000       6.500         John R. Tozzi*
- -------------------------------------------------------------------------
 12/2/96         A        14,500       8.250              CEF
- -------------------------------------------------------------------------
 12/2/96         D        14,500       8.250              CELP
- -------------------------------------------------------------------------
 12/9/96         A         3,800       8.500              CEF
=========================================================================

* John Tozzi has indirect beneficial ownership of stock owned by family member.


                                Page 7 of 8 Pages

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Signatures

     After reasonable inquiry and to the best of our knowledge and belief, the
undersigned certify that the information set forth in this statement is true,
complete and correct.


Dated:  December 23, 1996


                                      CAMBRIDGE INVESTMENTS LIMITED


                                      By: /s/ John R. Tozzi
                                         ------------------------------
                                             John R. Tozzi,
                                             President

                              Page 8 of 8 Pages


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