EXHIBIT 10.1

                                 PROMISSORY NOTE

To:      Pacific Rim Mining Corp.

         Suite 410,625 Howe Street
         Standard Life Building
         PO Box 28
         Vancouver, B.C.
         Canada V6C 2T6

20 September, 2005

WHEREAS PACIFIC RIM MINING CORP., a British Columbia company, (the "Seller") and
TREND MINING COMPANY, a corporation organized and existing under the laws of
Delaware, (the "Buyer") entered into a share purchase agreement for the issued
share capital of DMC Cayman Inc., a Cayman Islands exempted company, on 20
September, 2005, such agreement as amended is hereinafter referred to as the
"Agreement". The Buyer is required to issue this promissory note to the Seller
pursuant to sub-section 2.4(a) of the Agreement.

1        ACKNOWLEDGEMENT OF DEBT AND PROMISE TO PAY

The Buyer hereby acknowledges that it is indebted to the Seller for the
principal sum of TWO MILLION FOUR HUNDRED THOUSAND UNITED STATES DOLLARS
(US$2,400,000) (the "Principal Sum") and promises to pay to the order of the
Seller, at its principal office in Vancouver, British Columbia as shown above,
the following amounts on or before the following dates in United States dollars:

ONE MILLION UNITED STATES DOLLARS (US$1,000,000) on or before 20 September, 2006
(the "First Payment"); and ONE MILLION FOUR HUNDRED THOUSAND UNITED STATES
DOLLARS (US$1,400,000) on or before 20 September, 2007 (the "Second Payment"),

PROVIDED THAT, if the First Payment is not received by the Seller in cleared
finds by 4.00 pm Vancouver, British Columbia, Canada time on 20 September, 2006,
the Second Payment shall immediately become due and payable.

Interest shall not be payable on the Principal Sum.

2        SET-OFF AND COUNTERCLAIM

All payments made by the Buyer under this promissory note shall be made without
set-off or counterclaim.

3        PARTIAL PAYMENTS

If the Seller receives a payment insufficient to discharge each instalment of
the Principal Sum when due and payable, the Seller shall apply that payment
towards the obligations of the Buyer under this promissory note in the following
order:

3.1      first any amounts payable pursuant to paragraph 8; and


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3.2      second in or towards the payment of any  Principal  due and payable but
         unpaid under this promissory note.

4        GROSS-UP

All payments by the Buyer under this promissory note shall be made without any
deduction and free and clear of and without any deduction for or on account of
any taxes, except to the extent that the Buyer is required by law to make such a
deduction. If the Buyer is required by law to make such a deduction it shall pay
to the Seller such additional amount as will result in the receipt by the Seller
of the full amount which would otherwise have been due if no such deduction had
been made.

5        ASSIGNMENT

The Buyer shall not be entitled to assign or transfer any of its rights,
benefits or obligations hereunder without the prior written consent of the
Seller.

6        MISCELLANEOUS

6.1      No delay or omission on the part of the Seller in exercising  any right
         or remedy in respect of this promissory note shall impair that right or
         remedy or  operate  as or be taken to be a waiver of it,  nor shall any
         single,  partial  or  defective  exercise  of any such  right or remedy
         preclude any other or further  exercise under this  promissory  note of
         that or any other right or remedy.

6.2      The Seller's rights,  powers and remedies in respect of this promissory
         note are not, nor are they to be construed as, exclusive of any rights,
         powers or remedies  provided by law or  otherwise  and may be exercised
         from time to time and as often as the Seller deems expedient.

6.3      Any waiver by the Seller of any terms of this  promissory note shall be
         effective  only if given in writing  and then only for the  purpose and
         upon the terms and conditions (if any) on which it is given.

6.4      If at any time  any one or more of the  provisions  of this  promissory
         note is or becomes  illegal,  invalid or  unenforceable  in any respect
         under any law of any  jurisdiction  neither the  legality,  validity or
         enforceability of the remaining  provisions of this promissory note nor
         the legality,  validity or  enforceability  of such provision under the
         law of any other  jurisdiction shall be in any way affected or impaired
         as a result.

6.5      Any  statement,  certificate or  determination  of the Seller as to the
         Principal Sum or Interest due or (without  limitation) any other matter
         provided for in the promissory  note shall,  in the absence of manifest
         error, be conclusive and binding on the Buyer.

7        LAW AND JURISDICTION

This promissory note shall be governed by, and shall be construed in accordance
with, the laws of the Cayman Islands.

The Buyer  irrevocably  agrees for the exclusive  benefit of the Seller that the
courts of the Cayman Islands shall have  jurisdiction  to hear and determine any
suit,  action or proceeding  and to settle any dispute which may arise out of or
in  connection  with  this  promissory  note and for such  purposes  irrevocably
submits to the jurisdiction of such courts.



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8        FEES AND EXPENSES OF SELLER

The Buyer hereby waives any days of grace for payment of this note,
presentation, protest and notice of dishonour. If the Seller employs counsel for
advice with respect to this note, or any default hereunder, or to prepare and
file any petition, suit, action, proceeding, or other pleading or court process
relating to this note or any attempt to collect or enforce payment hereof
against the Buyer or any other party, then, and in each such event, all fees,
costs, expenses and charges (including, without limitation, the fees and
disbursement of legal counsel on a solicitor and own client basis) paid or
incurred by the Seller will be an additional liability owing by the Buyer to the
Seller hereunder with interest thereon at the interest rate specified herein
from the date such fees, costs, expenses or charges were incurred until paid in
full.



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IN WITNESS WHEREOF, the Buyer has executed this promissory note as a deed on
20 September, 2005.

EXECUTED AS A DEED AND DELIVERED by       )
TREND MINING COMPANY                      )
acting by Thomas A. Loucks                )
                                          ).....................................
                                          )
                                          )

In the presence of


                        Witness
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