MALLON RESOURCES CORP
SC 13D, 1998-01-20
CRUDE PETROLEUM & NATURAL GAS
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                               AMENDMENT NO. 2 TO
                                  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
                                   43rd Floor
                         San Francisco, California 94111
                            Tel. No.: (415) 781-0866
                 --------------------------------------------------------------

                  (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

                                December 16, 1997
                 --------------------------------------------------------------

             (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 6 Pages
                                                      

<PAGE>




- ------------------------                       --------------------------------
CUSIP No. 561240201                                      13D
- ------------------------                       --------------------------------

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

                Cambridge Investments Limited
- -------------------------------------------------------------------------------
                CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*     (a) |_|
                                                                      (b) |_|


- -------------------------------------------------------------------------------
      3         SEC USE ONLY


- -------------------------------------------------------------------------------
      4         SOURCE OF FUNDS*

                00
- -------------------------------------------------------------------------------
      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
            BENEFICIALLY           0 shares of Common Stock (See Item 5)
              OWNED BY
                EACH
              REPORTING
             PERSON WITH
- -------------------------------------------------------------------------------
     8       SHARED VOTING POWER

             0
- -------------------------------------------------------------------------------
    9       SOLE DISPOSITIVE POWER

            0 shares of Common Stock (See Item 5.)
- -------------------------------------------------------------------------------
  10      SHARED DISPOSITIVE POWER

          0
- -------------------------------------------------------------------------------

  11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

         0 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)

                0% of Common Stock  (See Item 5)
- -------------------------------------------------------------------------------
     14         TYPE OF REPORTING PERSON*

                IA
- -------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT

                                               Page 2 of 6 Pages
                                                     

<PAGE>



                                                   SCHEDULE 13D


                  This  Amendment No. 2 to Schedule 13D is being filed on behalf
of  Cambridge   Investments   Limited   ("Cambridge"  or  "CIL"),  a  California
corporation,  registered  as an investment  advisor in the State of  California,
regarding shares of Mallon Resources Corp.
sold 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

                  There is no change in this section.

Item 3.           Source and Amount of Funds

             Cambridge, through Cambridge Energy Fund International ("CEF"),
Cambridge Energy L.P. ("CELP"), Cambridge Oil & Gas, L.P. ("COG"), Palamundo,
LDC ("PAL") and Cambridge has sold its entire interest in the common stock of
the Issuer.


Item 4.           Purpose of the Transaction

            Cambridge  has  ceased to  beneficially  own any of the Common
Stock of the Issuer; accordingly, this provision is inapplicable.


Item 5.           Interest in Securities of the Issuer

                  (a) Cambridge,  through CEF,  CELP,  COG, PAL and CIL has sold
its entire interest in the common stock of the Issuer.

                  (b) Cambridge has ceased to beneficially own any of the Common
Stock of the Issuer, accordingly, this provision is inapplicable.

                  (c) The  transactions in the Issuer's  Securities by Cambridge
over the last sixty  (60) days are listed in Annex A attached  hereto and made a
part hereof.


                                               Page 3 of 6 Pages
                                                      

<PAGE>



                  (d) Cambridge has ceased to beneficially own any of the Common
Stock of the Issuer; accordingly, this provision is inapplicable.

                  (e) There is no change in this subsection.


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

                  There is no change in this section.


Item 7.           Material to be Filed as Exhibits

                  There is no change in this section.


                                               Page 4 of 6 Pages
                                                     

<PAGE>


<TABLE>

                                     ANNEX A

- -----------------------------------------------------------------------------------------
                                         MLRC
- -----------------------------------------------------------------------------------------
         <S>       <C>              <C>                         <C>               <C>
         DATE      ACCOUNT          TRANS                       SHARES            PRICE
                                    (A/D)                                         ($)
- -----------------------------------------------------------------------------------------
         11/14/97  PAL               D                            2707            10.75
- -----------------------------------------------------------------------------------------
         12/16/97  CEF               D                           19600             8.77
- -----------------------------------------------------------------------------------------
         12/16/97  CEF               D                           39200             8.77
- -----------------------------------------------------------------------------------------
         12/16/97  CEF               D                           14157             8.77
- -----------------------------------------------------------------------------------------
         12/16/97  CEF               D                           14500             8.77
- -----------------------------------------------------------------------------------------
         12/16/97  CEF               D                            1093             8.77
- -----------------------------------------------------------------------------------------
         12/16/97  CIL               D                          140000             8.77
- -----------------------------------------------------------------------------------------
         12/17/97  CEF               D                           48643             8.57
- -----------------------------------------------------------------------------------------
         12/18/97  CELP              D                           12000             8.56
- -----------------------------------------------------------------------------------------
         12/18/97  COG               D                           17000             8.58
- -----------------------------------------------------------------------------------------
         12/19/97  CELP              D                           25000             8.41
- -----------------------------------------------------------------------------------------
         12/22/97  CELP              D                            5300             8.04
- -----------------------------------------------------------------------------------------
         12/22/97  CELP              D                            9300             8.04
- -----------------------------------------------------------------------------------------
         12/22/97  CELP              D                           30400             8.04
- -----------------------------------------------------------------------------------------
         12/23/97  CELP              D                           22900             8.39
- -----------------------------------------------------------------------------------------
         12/23/97  CELP              D                           69000             8.39
- -----------------------------------------------------------------------------------------

</TABLE>


                                               Page 5 of 6 Pages
                                                      

<PAGE>


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:  January 16, 1998


                                               CAMBRIDGE INVESTMENTS LIMITED


                                               By: /s/ Jocelyn E. Weingart,
                                                     Vice President


                                               Page 6 of 6 Pages
                                                     
<PAGE>




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