# Amendment
to Exploration Agreementdated August 20, 2001, Twice Amended
on August 20, 2001 and Amended August 14, 2002

Among:

| | Anhydride
Petroleum (Canada) Inc.,  (formerly Comstock Petroleum Corp.),  a corporation  under the
laws of Alberta with an office located at Suite  850, 10655 Southport Rd. S.W., Calgary,
Alberta T2W 4Y1
| | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | (API)
| | -------

And:

| | October
Sun, a Nevada Corporation, a corporation under the laws of Nevada with an  office at
241 Ridge Street, Fourth Floor, Reno, Nevada USA 89501
| | ---------------------------------------------------------------------------------------------------------------------------------------------------

| | ("October
Sun")
| | ---------------

And:

| | Hodgkinson
Equities Corporation, a corporation under the laws of British Columbia with  an
office located at Suite 900, 595 Howe Street, Vancouver, B.C. V6C 2T5
| | ----------------------------------------------------------------------------------------------------------------------------------------------------------------

| | ("Hodgkinson")
| | --------------

And:

| | Robert
Edwards,  an  individual  with an address of #25,  1818 Cornwall  Ave., Vancouver, B.C.
V6J 1K7
| | ------------------------------------------------------------------------------------------------------

| | ("Edwards")
| | -----------

And:

| | Uranium
Power Corporation,  a publicly traded corporation under the laws  of the State of
Colorado  with an office at Suite 850,  10655  Southport  Rd. S.W., Calgary, Alberta T2W
4Y1
| | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | (UPC)
| | -------

1

---

Whereas:

|A. |  | API, October Sun, Hodgkinson, Edwards and UPC entered into an Exploration
Agreement dated August 20, 2001, twice amended August 20, 2001 and further
amended August 14, 2002 (the Agreement) and now wish to amend the
Agreement (the Fourth Amending Agreement);
|-- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|B. |  | For
purposes of this  Fourth  Amending  Agreement  all defined  terms and  references  shall
be in  reference  to the  Agreement  and  shall,  unless  expressly  noted,  have the
same  meaning as the  Agreement;
|-- |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|C. |  | Hodgkinson
(through  its  nominee  858642  Alberta  Ltd.) and Edwards  separately  wish to earn an
interest in the Initial Well, Lands and the Area of Mutual Interest;
|-- |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------

|D. |  | API
wishes  to  amend a  provision  contained  in  Schedule  "F"  attached  to the
Agreement  and  conditionally reduce certain non-royalty working interests of Hodgkinson
and Edwards by 25%.
|-- |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|E. |  | The
parties wish to amend aspects of the Agreement related to the Area of Mutual Interest.
|-- |  | ------------------------------------------------------------------------------------------

NOW
THEREFORE THIS FOURTH AMENDING AGREEMENT WITNESSES that in consideration of
the mutual covenants and agreements contained and for other good and valuable
consideration (the receipt and sufficiency of which is hereby acknowledged), the
parties hereto covenant and agree each with the others as follows:

# ARTICLE
I
INTERPRETATION

1.1  Definitions.
The Following amendments are effected:

|New
Lands | means each parcel or tract of land within the AMI excluding  Petroleum
& Natural Gas License nos. 5494040101, 5401070160, 5401070162,  540107163, 5401090094
and 5401100080.
|----------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------

# ARTICLE
IIIEXPLORATION AND DEVELOPMENT

3.1  Drilling
Option.  In respect of section 3.1 of the Agreement the same is amended as follows:

2

---

Subject
to 858642 and/or Edwards separately:

|(i) |  | funding
entirely  their  proportionate  share  (9.375%)  of  the  re-entry  and  production
testing costs under section 3.2;
|--- |  | ----------------------------------------------------------------------------------------------------------------------------

|(ii) |  | acknowledging penalty elections for the deepening of the
Initial Well beyond the present 1,650 metres, pursuant to Section 1007
of the CAPL Agreement (forms a part of schedule F to the
Agreement) under section 3.2;
|---- |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(iii) |  | acknowledging an amendment within Schedule F to the
Agreement, Elections to CAPL 1990 Operating Procedure at paragraph 4(b)
by substituting 300% in place of 200% in respect
of the Initial Well and in respect of subsequent wells by substituting
600% in place of 200%"; and,
|----- |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(iv) |  | acknowledging a conditional twenty-five percent (25%) reduction from their original intended but not previously earned working interests in the
Athabasca and Firebag Prospects, including the Initial Well;
|---- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | 858642
and/or Edwards separately shall have the right to participate, fund and earn a before and after payout interest in all wells drilled on each License on
the terms and conditions provided in this Article 3, provided that
858642 and Edwards participate in the first Well drilled on each
License.
| | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | Should
either of 858642 or Edwards for whatever reason not participate in the first
Well drilled on each license, the party not participating shall no
longer have the right to participate or earn an interest further in that
License.
| | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | Nothing
in this section shall affect the separate royalty interests to each of 858642 and Edwards.
| | ---------------------------------------------------------------------------------------------------

3.2  Initial
Well.  In respect of section 3.2 of the Agreement the same is amended as follows:

| | Separately
and not dependent on the others participation, each of 858642 and
Edwards shall pay 9.375% of the actual cost of re-entering and
production testing of the Initial Well to a depth of 1,650 metres. API
estimates the total cost at roughly $425,000 Cdn.
| | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | In
respect of the deepening of the Initial Well beyond 1,650 metres, each of 858642
and Edwards hereby confirm their separate and independent election not
to participate in the Drilling Costs in connection with deepening,
testing, Completing, Equipping, Capping or Abandoning of the Initial
Well, thereby triggering specified penalty provisions within section
1007 of the CAPL Agreement forming a part of Schedule F to the
Agreement.
| | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

3

---

| | Subject
to APIs receipt of payment from 858642 and/or Edwards required in this
section, each of 858642 and/or Edwards shall earn seventy-five percent
(75%) of their original intended respective interests such that each of
858642 and Edwards shall earn a 5.1152325% after payout working interest
in the Initial Well subject to provisions of the CAPL Agreement as
Schedule F at section 1007 with application of a 300% penalty
election.
| | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | In
the event either of 858642 or Edwards shall for whatever reason refuse or fail
to pay their share of the costs for the re-entering and testing of the
7-32 well, the party not paying their share of costs shall no longer
have any interest in either the Athabasca or Firebag Prospects nor be
entitled any interest in the Lands nor Area of Mutual Interest.
| | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | The
working interests of 858642 and Edwards in the Initial Well and spacing unit,
before and after payout, shall at all times be subject to the 9.5% GORR
and government royalties.
| | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

3.3  Second
Well.  In respect of section 3.3 of the Agreement the same is amended as follows:

| | Separately,
each of 858642 and Edwards shall have the right to participate and earn
in the Second Well and spacing unit a separate 4.21875% working interest
before payout and a 3.80859275% working interest after payout by paying
6.25125% of the Drilling Costs, Completing, Equipping, Capping or
Abandoning the Second Well at a location determined by API, provided
that the working interest of 858642 and/or Edwards in the Second Well,
before and after payout, shall be subject to the 9.5% GORR and government
royalties.
| | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

3.4  Third
Well.  In respect of section 3.4 of the Agreement the same is amended as follows:

| | If
the Third Well is:
| | ----------------------

|(a) |  | the first well drilled on any License the location of which is determined by API, separately and each of 858642 and Edwards shall have the
right to participate in the Third well and spacing unit to earn a
separate 4.21875% working interest before payout and a 3.80859375%
working interest after payout by paying 6.25125% of the Drilling Costs,
and costs in connection with Completing, Equipping, Capping or
Abandoning the Third Well; or,
|--- |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

4

---

|(b) |  | not the first well on any License the location of which is determined by API and subject to section 3.1, separately and each of 858642 and
Edwards shall have the right to participate in the Third Well and the
spacing unit to earn a separate 4.21875% working interest before payout
and a 3.80859375% working interest after payout by paying 4.875% of the
Drilling Costs, and costs in connection with Completing, Equipping,
Capping or Abandoning the Third Well.
|--- |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | Provided
that the working interest of 858642 and/or Edwards in the Third Well, before and after payout, shall be subject to the 9.5% GORR and government
royalties.
| | --------------------------------------------------------------------------------------------------------------------------------------------------------------------

3.5  Subsequent
Wells.  In respect of section 3.5 of the Agreement the same is amended as follows:

| | For
any Well drilled subsequent to the Third Well on any of Petroleum & Natural
Gas License nos. 5401070160, 5401070162, 540107163, 5401090094 and
5401100080:
| | ---------------------------------------------------------------------------------------------------------------------------------------------------------------

|(a) |  | if the well is the first well drilled the location of which is determined by API, separately and each of 858642 and Edwards have the right to
participate in such well and spacing unit to earn a separate 4.21875%
working interest before payout and a 3.80859375% working interest after
payout by separately paying 6.25125% of the Drilling Costs and costs in
connection with Completing, Equipping, Capping or Abandoning the well;
or,
|--- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(b) |  | if the well is not the first well drilled the location of which is determined by API, separately and each of 858642 and Edwards have the right to
participate in such well and spacing unit to earn a separate 4.21875%
working interest before payout and a 3.80859375% working interest after
payout by separately paying 4.6875% of the Drilling Costs and costs in
connection with Completing, Equipping, Capping or Abandoning the well.
|--- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | Provided
that the working interest of 858642 and/or Edwards in each Well subsequent to the Third Well, before and after payout, shall be subject to the 9.5%
GORR and government royalties.
| | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

3.6  Area of
Mutual  Interest.  In  respect  of  section  3.6 of the  Agreement  the same is
amended as follows:

| | If
at any time API or any of its Affiliates or Associates acquires an interest in
petroleum rights in respect of a parcel or tract of land which is in the
AMI, other than in respect of P & NG License Nos. 5401070160,
5401070162, 5401070163, 5401090094, 5401100080 or 5494040101, then such
interest shall be included and governed by this Agreement.
| | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | Should
either of 858642 and/or Edwards elect to participate in the acquisition of
subsequent licenses or other Petroleum and Natural Gas interests, each
of 858642 and/or Edwards separately shall pay 4.39453125% of the
acquisition cost, including related administrative costs.
| | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | Should
either of 858642 and/or Edwards decide not to elect to participate in the
acquisition of any subsequent license or other Petroleum and Natural Gas
interest, API shall no longer be required to extend to the
non-participating party any further opportunity to acquire any interest
in any license within the Area of Mutual Interest.
| | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | Subject
to either of 858642 and/or Edwards participating in the acquisition cost for
additional licenses of Petroleum and Natural Gas interests, each of
858642 and/or Edwards separately shall have the option to participate in
the drilling of wells on each new License acquired by API in the AMI by
separately paying 4.39453125% of the Drilling Costs and costs in connection with Completing, Equipping, Capping or Abandoning the initial well to
separately and each earn a 4.39453125% working interest before and after
payout in the well and spacing unit.
| | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | Neither
Hodgkinson, 858642 nor Edwards and their respective Affiliates and Associates
shall acquire an interest in petroleum rights in respect of any parcel
or tract of land which is in the AMI, without the prior written consent
of API.
| | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

5

---

|3.7 |  | Potential Farmout The parties acknowledge the potential for a
Farmout Agreement between API and a third party (Farmee)
entitling Farmee to earn a 25% working interest before payout reducing
to 18.75% working interest after payout in the Lands, Petroleum and Natural
Gas License no. 5494040101 and the Area of Mutual Interest. API agrees
to obtain Farmees acknowledgement of the 9.5% gross overriding
royalty of which a portion is held by 858642 and Edwards. In the event API
is unable to consummate a farmout prior to conclusion of the operations to
deepen the Initial Well beyond the 1650 meters, which operations
commenced December 11, 2002, but in any event no later than November 30,
2003 the interests of 858642 and Edwards shall revert to the previous
percentages contained in the Third Amended Agreement dated August 14, 2002.
|--- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|3.8 |  | Payment of Rental and Other Costs  Should API propose to drill
any well on either of P & NG License Nos. 5401070160, 5401070162,
5401070163, 5401090094, 5401100080 or 5494040101 to which either of
858642 and/or Edwards elect to participate, in the event they have not
previously done so, it shall be the obligation of each of 858642 and/or
Edwards, separately, to first pay their proportionate share, without
restriction, of any and all annual rentals or other amounts incurred by
API in respect of that License, including amounts paid in prior periods. Refusal
or failure to pay shall be taken as an election not to participate.
|--- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

6

---

|3.9 |  | Section 1007 Schedule F  The parties hereby amend
Schedule F, Elections to CAPL 1990 Operating Procedure at
paragraph 4(b) by substituting 300% in place of 200% in
respect of the Initial Well and in respect of all subsequent wells by
substituting 600% in place of 200%".
|--- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

In
witness whereof the parties hereto have executed this Fourth Amending
Agreement effective the 12th day of December, 2002:

|_______________________________
Anhydride Petroleum (Canada) Inc. | __________________________________

October Sun, a Nevada Corporation
|----------------------------------------------------------------- | ---------------------------------------------------------------------

|_______________________________
Hodgkinson Equities Corporation | __________________________________

Robert Edwards
|--------------------------------------------------------------- | --------------------------------------------------

|_______________________________
Uranium Power Corporation | 
|--------------------------------------------------------- | 

7

---