ASSIGNMENT OF OIL, GAS AND MINERAL LEASES
                                AND BILL OF SALE

STATE OF TEXAS             )
                           ) KNOW ALL MEN BY THESE PRESENTS
COUNTY OF FRIO             )

ASSIGNOR:                  RCI Energy, a Division of Reunion Consolidated, Inc.
                           John Fleming, President
                           P. O. Box 305
                           Orange Grove, Texas 78372

ASSIGNEE:                  Consolidated Oil & Gas, Inc.
                           316 Main St.
                           Humble, Texas 77338

     THAT,  ASSIGNOR,  for  adequate  consideration  of the  sum of TEN  DOLLARS
($10.00) tendered and other good and valuable  consideration  by, ASSIGNEE,  the
receipt and  sufficiency  of which are hereby  acknowledged,  and subject to the
terms,  provisions  and  reservations  set forth below,  by these  presents does
GRANT,  BARGAIN,  SELL, TRANSFER,  ASSIGN,  CONVEY AND DELIVER,  subject to said
reservations,  exceptions,  conditions and limitations as hereinafter set forth,
unto ASSIGNEE,  their heirs and assigns all of the undivided  leasehold  working
interest  of  ASSIGNOR  in and to the  Oil  and Gas  Lease(s)  described  in the
Exhibit(s) "A" attached hereto and made a part hereof.

     Reference is here made to said lease(s)  described in Exhibit "A" and their
record for a more complete  description of lands covered thereby;  the terms and
provisions  of the leases  which shall  extend to and be binding upon the heirs,
successors and assigns of each of the parties hereto, and for all other purposes
whatsoever.

     This Assignment of leasehold  working interest is made subject to the terms
and conditions of all ASSIGNMENT OF OVERRIDING  ROYALTY  INTERESTS  covering the
lease(s)  described  in  Exhibit(s)  "A",  which have been duly  recorded in the
records of the County Clerk of Zavala County, Texas or otherwise assigned.

1.   All rights and  interests  in or derived from Unit  Agreements,  orders and
decisions of state and Federal regulatory authorities  establishing units, Joint
Operating  Agreements,  Enhanced  Recovery  Agreements,  Water Flood Agreements,
Farmout  Agreements  and  Farmin  Agreements,   Options,   Drilling  Agreements,
Unitization,  Pooling  and  Communitization  Agreements,  Oil  and/or  Gas Sales
Agreements,  Processing Agreements,  Gas Gathering and Transmission  Agreements,
Gas  Balancing  Agreements,   Salt  Water  Disposal  and  Injection  Agreements,
Assignments of Operating Rights,  Working Interest,  Subleases,  and any and all
other  agreements to the extent they pertain to the Leases,  Lands and the wells
located on the Leases.

2.   All Rights of Way, Easements,  Surface Fees, Surface Leases, Servitudes and
Franchises,  insofar as they pertain to the Leases and the wells  located on the
Leases.

3.   All  producing,  non-producing  and shut-in  oil and gas wells,  salt water
disposal  wells,  water  wells,  injection  wells,  and all  other  wells  on or
attributable to the Leases,  whether or not identified in the Exhibit(s) to this
Agreement.

4.   All pumps, casing,  rods, tubing,  wellhead equipment,  separators,  heater
treaters,  tanks,  pipelines,  gathering lines, flow lines, valves, fittings and
all  other  surface  and  down  hole  equipment,  fixtures,  related  inventory,
gathering  and treating  facilities,  personal  property and  equipment  used in
connection  with the  Lease(s)  and the well(s)  located on the Lease(s) and all
other interests described above.


                                                                      Exhibit 10
                                                               Page 1 of 4 Pages




IN ADDITION TO THE ABOVE  DESCRIPTION OF SAID PROPERTIES AND INTERESTS IN LEASES
AND LANDS;

1.   ASSIGNEE,  shall at the  Effective  Date (herein  defined)  assume,  and be
responsible for and comply with all duties and obligations of ASSIGNOR,  express
or implied, with respect to the interests,  including, without limitation, those
arising under or by virtue of any lease, contract, agreement,  document, permit,
applicable  statute or rule,  regulation or order of any governmental  authority
(specifically  including,   without  limitation,  any  governmental  request  or
requirement to plug,  re-plug and/or abandon any well of whatsoever type, status
or  classification,  or take any  clean-up or other  action with  respect to the
property or premises) and defend,  indemnify and hold ASSIGNOR harmless from any
and all claims in connection therewith.

2.   ASSIGNEE  shall defend,  indemnify and hold ASSIGNOR  harmless from any and
all claims in favor of any person,  entity, or governmental  entity for personal
injury,  death or damage to  property  or to the  environment,  or for any other
relief,   arising  directly  or  indirectly  from,  or  incident  to,  the  use,
occupation,  operation,  maintenance or abandonment of any of the Interests,  or
condition  of the property or premises,  whether  latent or patent,  and whether
arising from or contributed  to be the  negligence in any form of ASSIGNOR,  its
agents, employees or contractors,  and asserted against ASSIGNEE and/or ASSIGNOR
after the Effective Date, whether or not any such claims result from conditions,
actions or inactions at or before the Effective Date.

3.   ASSIGNEE  shall be  responsible  for any and all claims  arising out of the
production or sale of hydrocarbons  from the interests or the proper  accounting
and  economic  matters,  sale of  products  for a price in excess of the maximum
lawful price and claims based upon  contracts,  insofar as such claims relate to
periods of time after the Effective Date, and ASSIGNEE,  shall defend, indemnify
and hold ASSIGNOR harmless from any and all such claims.

     This  ASSIGNMENT  AND  BILL OF SALE  shall be  effective  on the 1st day of
August,  2000 (the "Effective Date"),  and may be executed in counterpart,  with
each counterpart being deemed an original for all purposes

EXECUTED THIS 29th DAY OF July, 2000.

Assignor:

R.C.I. Energy

     /s/ John P. Fleming
- ---------------------------------------------
John P. Fleming President       ASSIGNOR


STATE OF TEXAS             )
                           )
COUNTY OF __________       )

     Before me the undersigned  authority,  on this day personally appeared John
P.  Fleming,  President of RCI Energy known to me to be the person whose name is
subscribed to the foregoing  instrument and  acknowledged to me that he executed
the same for the purposes and consideration therein expressed.

Given under my hand and seal of office this ______ day of ____________, 2000


                                                    ----------------------------
                                                    Notary Public State of Texas


                                                                      Exhibit 10
                                                               Page 2 of 4 Pages



ACCEPTED AND AGREED TO:

Consolidated Oil & Gas, Inc.

     /s/ James Carl Yeatman
- -----------------------------------
                      ASSIGNEE

STATE OF TEXAS             )
                           )
COUNTY OF FRIO             )

     Before me the undersigned authority,  on this day personally appeared James
Carl  Yeatman,  known to me to be the  person  whose name is  subscribed  to the
foregoing  instrument and  acknowledged  to me that he executed the same for the
purposes and consideration therein expressed.

Given under my hand and seal of office this 29th day of July, 2000

                                                     /s/ Maria Alicia Machado
                                                    ----------------------------
                                                    Notary Public State of Texas

[STATE OF TEXAS NOTARIAL SEAL
My commission expires 03-25-2001]














                                                                      Exhibit 10
                                                               Page 3 of 4 Pages



                                   EXHIBIT "A"

Attached  to and  made a part of the  ASSIGNMENT  OF OIL AND GAS  LEASE(S)  from
R.C.I.  ENERGY a Division of Reunion  Consolidated,  Inc. to Sabinal  Resources,
Inc. Consolidated Oil & Gas, Inc. Covering:

     Oil and Gas Lease dated May 19, 1970, executed by LETA J. GLASSCOCK, ET AL,
as Lessors, to WINN EXPLORATION CO., INC., as Lessee,  covering 8,891.5 acres of
land,  more or less, in Zavala  County,  Texas,  INSOFAR AS the lease covers and
pertains to the following described lands and depths:

       40 acres of land,  more or less, and being the Southeast  Quarter
       (SE 1/4) of the  Northeast  Quarter  (NE 1/4)  I.&  G.N.RR.  CO.,
       Survey No. 46,  Abstract 355, Block 3,  containing Well No. 46-1,
       and limited to the San Miguel Formation.



















                                                                      Exhibit 10
                                                               Page 4 of 4 Pages