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Exhibit 4.19 

AGREEMENT 

This Agreement, entered into as of May 1, 2005, ishereby made between Metallica Management Inc. ("Metallica" or "Client") locatedat 12200 East Briarwood Avenue, Suite 165, Centennial, Colorado 80112 and theIndependent Contractor set forth below in accordance with the following terms,conditions and provisions: 

1.*Identity of IndependentContractor (hereinafter "IC"):*Robert Martinez - Consulting Engineer 2477 E. Packsaddle Dr. Coeur d' Alene, ID 83815 Telephone: (208) 772-7363 Social Security Number or Federal E.I.N.: _________________ 

| Type of Entity:  [x] Sole proprietorship[ ] Partnership
                                [ ] Corporation[ ] Limited    Liability Company
                                [ ] Other 
2.*Scope of Services to bePerformed:*Consulting services on a part-time basis to assist with review, evaluationand due diligence of merger candidates and property acquisitions, as well asprovide consulting on strategic issues. 
*3.*Terms of payment:*IC shall be compensated for his services performed pursuant to thisAgreement at a rate of $125 per hour, not to exceed $1,000 per day. IC shallsubmit invoices to Metallica detailing the services rendered on a monthly orproject basis. Metallica agrees to promptly pay such invoices. 
*4.*Reimbursement ofExpenses:*Metallica will reimburse IC for reasonable and customary expenses incurredduring the performance of IC's services. 

5. *Equipment, Tools, Materialsor Supplies:*IC shall supply all equipment, tools materials and/or supplies to accomplish theservices to be performed. 

6. *Federal, State and LocalPayroll Taxes:*Neither federal, state or local income taxes, or any payroll related taxes shallbe withheld or paid by Metallica on behalf of IC or the employees of IC. ICshall not be treated as an employee with respect to the services performedhereunder for Federal or state tax purposes. 

7. *Notice to IC Regarding IC'sTax Duties and Liabilities:*IC understands that IC is responsible to pay, according to law, IC's income tax.If IC is not a corporation, IC further understands that IC may be liable forself-employment (social security and medicare) tax, to be paid by IC accordingto law. 

*8.*Fringe Benefits:*Because IC is engaged in IC's own independently established business,IC is not eligible to participate in any employee pension, health or otherfringe benefit plan of Metallica. 
*9.*Metallica Not Responsible for Workers'Compensation:*Metallica shall not maintain workers' compensation insuranceconcerning IC or the employees of IC. IC agrees to comply with the workers'compensation law concerning IC and the employees of IC, and shall provide to Metallica a certificate of workers' compensation insurance. 
*10.Term of Agreement. This Agreement shall begin on May 1, 2005 and shall terminate onDecember 31, 2005. 
*11.Termination Without Cause: Without cause, either party may terminate this agreement after giving30 days prior written notice to the other of intent to terminate without cause.The parties shall deal with each other in good faith during the 30-day periodafter any notice of intent to terminate without cause has been given. 
*12.Termination With Cause: With reasonable cause, either party may terminate this agreementeffective immediately upon giving of written notice of termination for cause.Reasonable cause shall include a material violation of this Agreement or any actexposing the other party to liability to others for personal injury or propertydamage. 
*13.Non-waiver: The failure of either party to exercise any of its rights under thisagreement for a breach thereof shall not be deemed to be a waiver of such rightsor a waiver of any subsequent breach. 
*14.No Authority to Bind Metallica: IC has no authority to enter into contracts or agreements on behalfof Metallica. This Agreement does not create a partnership between the parties.
*15.Declaration by Independent Contractor. IC has complied with all Federal, state and local laws regardingbusiness permits, certificates and licenses that may be required to carry outthe work to be performed under this Agreement. 
*16.How Notices Shall be Given: Any notice given in connection with this agreement shall be given inwriting and shall be delivered by hand to the party or by certified mail, returnreceipt requested, to the party at the party's address stated herein. Any partymay change its address stated herein by giving notice of the change inaccordance with this paragraph. 
*17.Choice of Law: Any dispute under this agreement or related to this agreement shallbe decided in accordance with the laws of the State of Colorado. 
*18.Entire Agreement: This is the entire agreement of the parties. 

*19.Severability: If any part of this Agreement is held unenforceable, the rest of thisAgreement will nevertheless remain in full force and effect. 
*20.Confidential Information: IC shall not at any time during the term of this Agreement, or at anytime thereafter, use or disclose proprietary information of Metallica or any ofits affiliates, without the written authorization of Metallica. Affiliates ofMetallica are as follows: 

Metallica Resources Inc. Metallica Barbados Inc. Minera San Xavier S.A. de C.V. Minera Metallica Ltda. Metallica Brasil Ltda. MMM Exploraciones S.A. de C.V. De Re Holdings Inc. Datawave Sciences Inc. Raleigh Mining International Limited Minera San Xavier, S.A. de C.V. Servicios del Plata y Oro, S.A. de C.V. 
*21.Amendments: This Agreement may be supplemented, amended or revised only inwriting by agreement of the parties. 

Metallica Management Inc. 
/s/ Richard J.    HallDate: May 9, 2005Richard J. Hall President and    Chief Executive Officer         /s/ Robert    MartinezDate: May 2, 2005Robert Martinez Independent    Contractor **************** |
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