EXHIBIT 10.3 20 SEPTEMBER, 2005 PACIFIC RIM MINING CORP. (AS ASSIGNOR) AND TREND MINING COMPANY (AS ASSIGNEE) ASSIGNMENT OF RIGHT TO REPAYMENT OF LOAN MADE TO DMC CAYMAN INC. MAPLES AND CALDER DEED OF ASSIGNMENT ------------------ THIS ASSIGNMENT is made on 20 September, 2005 BETWEEN: (1) PACIFIC RIM MINING CORP., a British Columbia company, (the "ASSIGNOR"); and (2) TREND MINING COMPANY, a corporation organized and existing under the laws of Delaware, (the "ASSIGNEE"). WHEREAS: (A) Pursuant to the Agreement (as defined below), the Assignee has agreed to acquire the Pacrim Loan (as defined in the Agreement) subject to the terms and conditions set out in the Agreement. (B) Pursuant to the Agreement, the Assignor hereby enters into this assignment of the right to repayment of the Pacrim Loan. IT IS AGREED as follows: 1 DEFINITIONS AND INTERPRETATION In this Assignment (except where the context otherwise requires) the following words and expressions shall have the following meanings: "AGREEMENT" means the share purchase agreement made as of 20 September, 2005 between the Assignor and the Assignee; "COMPANY" means DMC Cayman Inc., an exempted company incorporated in the Cayman Islands; and "PACRIM LOAN" has the meaning given in the Agreement. 2 ASSIGNMENT The Assignor hereby assigns the right to repayment of the Pacrim Loan to the Assignee free and clear of any liens or other third party rights. This assignment is to take effect as an absolute assignment (and not by way of charge only). 3 ACKNOWLEDGEMENT OF ASSIGNMENT The Assignee acknowledges the assignment pursuant to clause 2 above. 4 NOTICE TO COMPANY The Assignor hereby undertakes to deliver a copy of this Assignment to the Company. 5 GOVERNING LAW This Assignment is governed by, and shall be construed in accordance with, the law of the Cayman Islands. 2 6 COUNTERPARTS This Assignment may be executed in any number of counterparts and all such counterparts taken together shall be deemed to constitute one and the same instrument. 3 IN WITNESS WHEREOF this Assignment has been executed and delivered as a Deed the day and year first above written. EXECUTED AS A DEED AND DELIVERED by ) PACIFIC RIM MINING CORP. ) acting by Catherine McLeod-Seltzer ) ................................. ) ) ) In the presence of: ______________________Witness EXECUTED AS A DEED AND DELIVERED by ) TREND MINING COMPANY ) acting by Thomas A. Loucks ) ................................. ) ) ) In the presence of: ______________________Witness 1 4 ACKNOWLEDGEMENT OF NOTICE OF ASSIGNMENT To: Trend Mining Company. 5439 South Prince Street Littleton, Co 80120 United States DMC Cayman Inc. hereby acknowledges that it has received express notice in writing of the absolute assignment by Pacific Rim Mining Corp. to Trend Mining Company of the right to repayment of the Pacrim Loan (as defined in the Share Purchase Agreement between Trend Mining Company and Pacific Rim Mining Corp.). DMC CAYMAN INC. By: ____________________ Title:___________________ Date:___________________