Document:

Metallica Resources Inc.: Exhibit 4.18 - Prepared by TNT Filings Inc.

 

Exhibit 4.18 

FIRST AMENDMENT TO MINING CONTRACT 

This FIRST AMENDMENT TO MINING CONTRACT, dated as of
April 5, 2005 (this "Amendment"), is entered into by and between Minera San
Xavier, S.A. de C.V., a Mexican corporation ("Owner"), and Washington Group
Latin America, Inc., a Delaware, U.S.A. corporation ("Contractor"). Owner and
Contractor are referred to in this Amendment individually as a "Party" and
together as the "Parties." 

RECITALS 

WHEREAS, Owner owns and operates the
Cerro San Pedro Mine located in Cerro de San Pedro, Mexico (the "Mine"); 

WHERAS, the Parties to this Amendment
are Parties to the Mining Contract, effective as of December 30, 2003 (the
"Mining Contract"), in which Owner engaged Contractor to, among other things,
perform drilling, blasting, excavating, mining, hauling and construction-related
services at the Mine; 

WHEREAS, in consideration for Owner
reimbursing Contractor for certain standby charges of Contractor during the time
period between May 12, 2004 and February 28, 2005, Contractor has agreed to the
development of a new termination provision in the event that the Owner must
terminate the Mining Contract due to an Event of Force Majeure; and 

WHEREAS, the Parties desire to enter
into this Amendment to formalize their verbal agreements and to update the
designation of persons to receive notice. 

NOW THEREFORE, in consideration of the
mutual promises set forth in this Amendment and for other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, the
Parties to this Amendment, intending to be legally bound, agree as follows:

AGREEMENT 

  1.
  Unless otherwise defined in this Amendment, all capitalized terms used herein
  that are defined in the Mining Contract shall have the respective meanings
  given to such terms in the Mining Contract. 

  
  2. The second sentence of the fourth
  paragraph of Article 13 shall be deleted in its entirety and the following
  sentences shall be substituted therefor: 

Page 1 of 4 

  In the event of such termination,
  Owner shall pay Contractor the same amounts as would be paid, under Section
  12.2.1(a) through 12.2.1(e). Contractor shall also be entitled to a One
  Million Dollar ($1,000,000) break fee; 
  provided that,
  in the event Owner or any of Owner's direct or indirect affiliates recommences
  the Project within one year from the date in which Owner or Contractor
  terminates the Agreement due to an Event of Force Majeure, Contractor shall
  credit Owner $500,000 towards the remobilization of Contractor's Equipment and
  personnel to the Project. 

  3.
  In Article 14 of the
  Mining Contract 

  
    A.
    Change the recipient
    for primary copy of notice to Owner to the "General Manager" instead of the
    "Mine Manager"; 

    B.
    Change the recipient
    of the copy of any notice to Owner to "Richard J.  Hall, President and
    Chief Executive Office" instead of "Fred H. Lightner, Sr. Vice President and
    Chief Operating Officer"; 

    C.
    Add the following
    provision immediately following Contractor's official notice information:
    

  

	
    With a copy to:
	Washington Group
    International, Inc.
	
     
	Attn: Brian Best
	
     
	Regional Managing
    Attorney
	
     
	7800 E. Union
    Avenue, Suite 100
	
     
	Denver, CO 80237
	
     
	U.S.A.
	
     
	Phone: (303)
    843-2855
	
     
	Fax: (303)
    343-2266

  4.
  Exhibit K of the Mining Contract is deleted in its entirety and the
  revised Exhibit K
  attached hereto is substituted therefor. 

  5.
  Except as expressly
  modified pursuant to this Amendment, all other provisions of the Mining
  Contract are unaffected, remain in full force and effect with no other
  amendments or modifications and are ratified and confirmed in all respects.
  

  6.
  This Amendment shall
  be governed by the laws of the State of Colorado, excluding any provisions or
  principles thereof, which would require the application of the laws of a
  different jurisdiction. 

  7.
  This Amendment may be
  executed in any number of counterparts, all of which taken together shall
  constitute a single and complete agreement. 

Page 2 of 4 

IN WITNESS WHEREOF and intending to be
legally bound, the Parties have executed this Amendment on this 5 day of April,
2005. 

	
    Minera San Xavier, S.A. de C.V.
	Washington Group
    Latin America,
	
     
	Inc.
	
     
	 
	
    By:        
    /s/ Richard J. Hall
	By:     
    /s/ LeRoy E. Wilkes
	
    Name:       
    Richard J. Hall
	Name:      
    LeRoy E. Wilkes
	
    Title:         
    Director
	Title:        
    President Mining Business Unit
	
     
	                 
    Washington Group International,
	
     
	                  
    Inc. Attorney-in-Fact
	
     
	                  
    Washington Group Latin America, Inc.

 

 

Page 3 of 4 

EXHIBIT K 

PERMIT CONDITIONS 

(See Attached) 

 

 

Page 4 of 4Metallica Resources Inc.: Exhibit 4.19 - Prepared by TNT Filings Inc.

 

Exhibit 4.19 

AGREEMENT 

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

1. Identity of Independent
Contractor (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 be
Performed: 

Consulting services on a part-time basis to assist with review, evaluation
and due diligence of merger candidates and property acquisitions, as well as
provide consulting on strategic issues. 

3. Terms of payment: 

IC shall be compensated for his services performed pursuant to this
Agreement at a rate of $125 per hour, not to exceed $1,000 per day. IC shall
submit invoices to Metallica detailing the services rendered on a monthly or
project basis. Metallica agrees to promptly pay such invoices. 

4. Reimbursement of
Expenses: 

Metallica will reimburse IC for reasonable and customary expenses incurred
during the performance of IC's services. 

5. Equipment, Tools, Materials
or Supplies: 

IC shall supply all equipment, tools materials and/or supplies to accomplish the
services to be performed. 

6. Federal, State and Local
Payroll Taxes: 

Neither federal, state or local income taxes, or any payroll related taxes shall
be withheld or paid by Metallica on behalf of IC or the employees of IC. IC
shall not be treated as an employee with respect to the services performed
hereunder for Federal or state tax purposes. 

7. Notice to IC Regarding IC's
Tax 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 for
self-employment (social security and medicare) tax, to be paid by IC according
to 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 other
fringe benefit plan of Metallica. 

9. 
Metallica Not Responsible for Workers'
Compensation: 

Metallica shall not maintain workers' compensation insurance
concerning 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 on
December 31, 2005. 

11.
Termination Without Cause: 

Without cause, either party may terminate this agreement after giving
30 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 period
after any notice of intent to terminate without cause has been given. 

12.
Termination With Cause: 

With reasonable cause, either party may terminate this agreement
effective immediately upon giving of written notice of termination for cause.
Reasonable cause shall include a material violation of this Agreement or any act
exposing the other party to liability to others for personal injury or property
damage. 

13.
Non-waiver: 

The failure of either party to exercise any of its rights under this
agreement for a breach thereof shall not be deemed to be a waiver of such rights
or a waiver of any subsequent breach. 

14.
No Authority to Bind Metallica: 

IC has no authority to enter into contracts or agreements on behalf
of 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 regarding
business permits, certificates and licenses that may be required to carry out
the work to be performed under this Agreement. 

16.
How Notices Shall be Given: 

Any notice given in connection with this agreement shall be given in
writing and shall be delivered by hand to the party or by certified mail, return
receipt requested, to the party at the party's address stated herein. Any party
may change its address stated herein by giving notice of the change in
accordance with this paragraph. 

17.
Choice of Law: 

Any dispute under this agreement or related to this agreement shall
be 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 this
Agreement 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 any
time thereafter, use or disclose proprietary information of Metallica or any of
its affiliates, without the written authorization of Metallica. Affiliates of
Metallica 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 in
writing by agreement of the parties. 

Metallica Management Inc. 

	/s/ Richard J.
    Hall	Date: May 9, 2005
	Richard J. Hall	 
	President and
    Chief Executive Officer	 
	 	 
	 	 
	 	 
	 	 
	/s/ Robert
    Martinez	Date: May 2, 2005
	Robert Martinez	 
	Independent
    Contractor

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