Amendment to the Option and Joint Venture Agrmnt



  
 Exhibit 10.20 
  
 Amendment to the OPTION AND JOINT VENTURE AGREEMENT 
 Of March 15th, 2001

  
 It is hereby agreed this 14 day of May, 2002, to amend the OPTION AND JOINT VENTURE AGREEMENT of March _15
        , 2001, (“The Agreement”) between MINERA ANDES INC., a corporation formed under the laws of Canada (“MAI”), MINERA ANDES S.A., a corporation formed under the laws of
Argentina (“MASA”) and MAURICIO HOCHSCHILD & CIA. LTDA., a corporation formed under the laws of Peru (“MHC”). 
  
 By
mutual consent as witnessed by the signing of this document it is hereby agreed that “Rights” as defined under the preamble of The Agreement and more particularly described in Schedule A of The Agreement will be modified effective as of
May 15, 2002 to the areas of interest described in Exhibit 1. 
  
 Also, by mutual consent as witnessed by the signing of this document it is
hereby agreed that MHC will hereafter take over the responsibilities of maintaining the Rights described in Exhibit 1as defined under section 7.1.4 (f) of The Agreement. 
  
 Neither party shall take any action during the Option Period to exclude from the Property any portion or parcel of the Rights described in Exhibit 1 without the consent of the other party, except in
accordance with the procedure state in Section 7.2 of The Agreement. 
  
 IN WITNESS WHEREOF the parties have executed this Agreement as of
the day, month and year first above written. 
  
 MINERA ANDES INC. 
  
 
	 
	 By:
 	 	 /s/    Allen V. Ambrose        
 

	 Its:
 	 	 President
 

 
  
 MINERA ANDES S. A. 
  
 
	 
	 By:
 	 	 /s/    Jorge Vargas    
 

	 Its:
 	 	  

 
  
 MAURICIO HOCHSCHILD & CIA. LTD. 

 
 
	 
	 By:
 	 	 /s/    Jorge Benavides
 

	 Its:
 	 	  

 







  
 EXHIBIT 1 
  
 
	 PROPERTY TYPE
 
	 	 FILE
 
	 	 AREA REAL
 
	 	 Comments
 

	 El Pluma 1
 	 	 410.411/MA/99
 	 	 750
 	 	 Ex cateo 402.845
 
	 El Pluma 2
 	 	 412.277/MA/99
 	 	 1000
 	 	 Ex cateo 402.845
 
	 El Pluma 3
 	 	 412.279/MA/99
 	 	 750
 	 	 Ex cateo 402.845
 
	 El Pluma 4
 	 	 412.281/MA/99
 	 	 1000
 	 	 Ex cateo 402.845
 
	 El Pluma E1
 	 	 410.412/MA/99
 	 	 1000
 	 	 Ex cateo 403.627
 
	 El Pluma E2
 	 	 412.278/MA/99
 	 	 1000
 	 	 Ex cateo 403.627
 
	 El Pluma E3
 	 	 412.280/MA/99
 	 	 800
 	 	 Ex cateo 403.627
 
	 Saavedra 10
 	 	 413.395/MA/00
 	 	 1000
 	 	 in cateo
 
	 Saavedra 11
 	 	 401.874/MA/01
 	 	 1000
 	 	 in cateo
 
	 Saavedra 12
 	 	 401.875/MA/01
 	 	 1000
 	 	 in cateo
 
	 Saavedra 13
 	 	 401.876/MA/01
 	 	 1000
 	 	 in cateo
 
	 Saavedra 14
 	 	 401.877/MA/01
 	 	 1000
 	 	 in cateo
 
	 Saavedra 1a
 	 	 410.093/MA/99
 	 	 1000
 	 	 in cateo
 
	 Saavedra 2a
 	 	 410.091/MA/99
 	 	 1000
 	 	 in cateo
 
	 Saavedra 3
 	 	 410.096/MA/99
 	 	 800
 	 	 ex cateo
 
	 Saavedra 4
 	 	 410.095/MA/99
 	 	 800
 	 	 in cateo
 
	 Saavedra 5
 	 	 410.089/MA/99
 	 	 800
 	 	 in cateo
 
	 Saavedra 6b
 	 	 410.094/MA/99
 	 	 800
 	 	 ex cateo
 
	 Saavedra 7a
 	 	 410.090/MA/99
 	 	 1000
 	 	 in cateo
 
	 Saavedra 8
 	 	 410.092/MA/99
 	 	 1000
 	 	 in cateo
 
	 Saavedra 9
 	 	 413.396/MA/00
 	 	 1000
 	 	 in cateo
 
	 SaavNE1
 	 	 400.625/MA/01
 	 	 1000
 	 	 ex cateo
 
	 SaavNE2
 	 	 400.626/MA/01
 	 	 1000
 	 	 ex cateo
 
	 SaavNE3
 	 	 400.627/MA/01
 	 	 500
 	 	 ex cateo
 
	 Tres A
 	 	 411.333/MA/99
 	 	 1000
 	 	 ex cateo
 
	 Tres B
 	 	 411.334/MA/99
 	 	 750
 	 	 ex cateo
 
	 Tres C
 	 	 414.264/MA/00
 	 	 980
 	 	 ex cateo
 
	 Tres Colores A
 	 	 411.332/MA/99
 	 	 1000
 	 	 Ex cateo 406.002
 
	 Tres Colores B
 	 	 411.331/MA/99
 	 	 998.5
 	 	 Ex cateo 406.002
 
	 Tres Colores C
 	 	 414.643/MA/00
 	 	 901
 	 	 Ex cateo 406.002
 
	 Tres Colores D
 	 	 414.642/MA/00
 	 	 901
 	 	 Ex cateo 406.002
 
	 Tres Colores E
 	 	 414.641/MA/00
 	 	 901
 	 	 Ex cateo 406.002
 
	 Tres Colores F
 	 	 414.640/MA/00
 	 	 901
 	 	 Ex cateo 406.002
 
	 Tres Colores G
 	 	 414.639/MA/00
 	 	 397.5
 	 	 Ex cateo 406.002
 
	 Tres D
 	 	 414.265/MA/00
 	 	 770.13
 	 	 ex cateo
 
	 Tres E
 	 	 414.266/MA/00
 	 	 999.93
 	 	 ex cateo
 
	 Tres F
 	 	 414.267/MA/00
 	 	 999.93
 	 	 ex cateo
 
	 Uno A
 	 	 413.095/MA/00
 	 	 840
 	 	 ex cateo
 

 

 








  
 
	 Uno B
 	 	 413.096/MA/00
 	 	 840
 	 	 ex cateo
 
	 Uno C
 	 	 413.097/MA/00
 	 	 820.2
 	 	 ex cateo
 
	 Uno D
 	 	 400.765/MA/01
 	 	 840
 	 	 ex cateo
 
	 Uno E
 	 	 400.766/MA/01
 	 	 840
 	 	 ex cateo
 
	 Uno F
 	 	 400.764/MA/01
 	 	 594
 	 	 ex cateo
 
	 Uno G
 	 	 401.507/MA/01
 	 	 1103.7
 	 	 ex cateo 406.943
 
	 Uno H
 	 	 401.508/MA/01
 	 	 560.4
 	 	 ex cateo 406.943
 
	 Uno I
 	 	 401.509/MA/01
 	 	 560.4
 	 	 ex cateo 406.943
 
	 AGUAS VIVAS
 	 	 403.089/MSC/01
 	 	 9992
 	 	  
	  	 	  	 	 50490.69