AMENDMENT TO MINERAL PROPERTY ACQUISITION AGREEMENT

THIS AMENDMENT TO MINERAL PROPERTY ACQUISITION AGREEMENT (“Amending Agreement”)
is made as of June 30, 2005, between ARGENTEX MINING CORPORATION (“Argentex”), a
Nevada corporation, and CHRISTOPHER IAN DYAKOWSKI, a businessman resident in
Canada.

WHEREAS:

A.         Delbrook Corporation and Mr. Dyakowski (collectively, the “Original
Parties”) are all of the parties to that certain Mineral Property Acquisition
Agreement dated as of February 24, 2004 (the “Santa Cruz Agreement”) pursuant to
which Mr. Dyakowski agreed to sell nine mineral claims located in the Province
of Santa Cruz, Argentina, all as more particularly described in the Santa Cruz
Agreement, to Delbrook Corporation, in exchange for 833,333 common shares in the
capital of Delbrook Corporation, as it was then constituted (the “Santa Cruz
Shares”);

B.         The Original Parties are all of the parties to that certain Mineral
Property Option Agreement (the “Option Agreement”) dated as of February 24,
2004, pursuant to which Mr. Dyakowski granted to Delbrook Corporation an option
to purchase certain mineral properties referred to in the Option Agreement as
the “Pinguino Property” for cash consideration payable over a specified period
of time in the aggregate amount of Cdn $450,000;

C.         The Original Parties are all of the parties to that certain Share
Purchase Agreement (the “SCRN Agreement”) dated as of February 24, 2004 pursuant
to which Mr. Dyakowski agreed to sell to Delbrook Corporation all of the issued
and outstanding shares of SCRN Properties Ltd. (“SCRN”) in exchange for 833,333
common shares in the capital of Delbrook Corporation, as it was then constituted
(the “SCRN Shares”);

D.         The Original Parties are party to an Escrow Agreement dated as of
March 4, 2004 (the “Escrow Agreement”), pursuant to which the SCRN Shares were
deposited into escrow with the law firm of Sichenzia Ross Friedman Ference LLP
(the “Escrow Agent”);

E.         Pursuant to Articles of Merger filed with the Secretary of State of
the State of Nevada on March 10, 2004, Delbrook Corporation merged into Argentex
effective March 10, 2004 (the “Merger”), with Argentex surviving as the
successor-by-merger to Delbrook Corporation in respect of, among other things,
the Santa Cruz Agreement, the Option Agreement, the SCRN Agreement and the
Escrow Agreement;

F.         As a result of the Merger, the Santa Cruz Shares and SCRN Shares were
converted into an aggregate of 1,666,666 common shares of Argentex;

G.         On or about March 15, 2004, Argentex declared a stock dividend of two
shares for every one share outstanding, thereby increasing the number of
Argentex common shares registered to Mr. Dyakowski pursuant to the Santa Cruz
Agreement, after the conversion of the Santa Cruz Shares pursuant to the Merger
and after giving effect to the stock dividend, from 833,333 to

 

--------------------------------------------------------------------------------

- 2 -

 

 

2,499,999 (and any reference hereafter to the Santa Cruz Shares shall mean these
2,499,999 common shares of Argentex);

H.         Also as a result of the March 15, 2004 stock dividend declared by
Argentex, the number of Argentex common shares registered to Mr. Dyakowski
pursuant to the SCRN Agreement, after the conversion of the SCRN Shares pursuant
to the Merger and after giving effect to the stock dividend, was increased from
833,333 to 2,499,999 (and any reference hereafter to the SCRN Shares shall mean
these 2,499,999 common shares of Argentex);

I.          Mr. Dyakowski and Argentex desire to amend the Santa Cruz Agreement,
the Option Agreement, the SCRN Purchase Agreement and the Escrow Agreement on
the terms set forth in this Agreement.

NOW, THEREFORE, for and in consideration of the premises, and for other good and
valuable consideration the receipt and sufficiency of which is hereby
acknowledged by each of Mr. Dyakowski and Argentex (the “Parties”), the Parties
do hereby agree as follows:

1.

RECITALS

 

1.1

The recitals set forth above are acknowledged by the Parties to be true and
correct and are incorporated herein by this reference.

2.

AMENDMENTS TO THE OPTION AGREEMENT

 

2.1

The date “July 1, 2005” in Section 3.2(b) of the Option Agreement is hereby
deleted and the date “September 1, 2005” is inserted therefor.

3.

AMENDMENTS TO THE SANTA CRUZ AGREEMENT

 

3.1

The Parties acknowledge that the Escrow Agent currently holds the Santa Cruz
Shares in escrow pursuant to Section 4 of the Santa Cruz Agreement.

3.2

Section 4.3 of the Santa Cruz Agreement is hereby deleted in its entirety.

 

3.3

Upon payment to Mr. Dyakowski of the sum of ten dollars ($10.00) in lawful
currency of Canada, the receipt and sufficiency of which Mr. Dyakowski
acknowledges by his execution of this Amending Agreement, the Parties agree to
the immediate cancellation of 2,199,999 of the Santa Cruz Shares, and the Escrow
Agent is hereby directed to immediately release these 2,199,999 common shares to
Argentex for cancellation.

3.4

The balance of the Santa Cruz Shares, consisting of 300,000 common shares in the
capital of Argentex (hereafter the “Santa Cruz Balance Shares”) shall be
released to Mr. Dyakowski from escrow upon completion of the transfer of title
to SCRN of all of the mineral interests which are defined, collectively, as the
“Property” in Recital A of the Santa Cruz Agreement, which transfer shall in
form and substance be satisfactory to SCRN’s attorneys in Argentina.

 

 

--------------------------------------------------------------------------------

- 3 -

 

 

 

4.

AMENDMENTS TO THE SHARE PURCHASE AGREEMENT AND THE ESCROW AGREEMENT

4.1

The Parties acknowledge that the Escrow Agent currently holds the SCRN Shares in
escrow pursuant to Section 4 of the SCRN Agreement and pursuant to Section 1 of
the Escrow Agreement.

4.2

Section 4.3 of the SCRN Agreement and Section 2 of the Escrow Agreement are
hereby deleted in their entirety.

4.3

Upon payment to Mr. Dyakowski of the sum of ten dollars ($10.00) in lawful
currency of Canada, the receipt and sufficiency of which Mr. Dyakowski
acknowledges by his execution of this Amending Agreement, the Parties agree to
the immediate cancellation of 2,199,999 of the SCRN Shares, and the Escrow Agent
is hereby directed to immediately release these 2,199,999 common shares to
Argentex for cancellation.

4.4

The balance of the SCRN Shares, consisting of 300,000 common shares in the
capital of Argentex (hereafter the “SCRN Balance Shares”), shall be released
from escrow and delivered to Mr. Dyakowski upon completion of the transfer of
title to SCRN of all of the mineral interests which are defined, collectively,
as the “Property” in Recital A of the SCRN Agreement, which transfer shall in
form and substance be satisfactory to SCRN’s attorneys in Argentina.

5.

commercially reasonable efforts

 

5.1

Mr. Dyakowski shall use commercially reasonable efforts to complete the
conditions to the release from escrow of the SCRN Balance Shares and the Santa
Cruz Balance Shares as expeditiously as is practicable.

6.

Counterparts

 

6.1

This Amending Agreement may be executed in several counterparts, each of which
will be deemed to be an original and all of which will together constitute one
and the same instrument.

7.

Electronic Means

 

7.1

Delivery of an executed copy of this Agreement by electronic facsimile
transmission or other means of electronic communication capable of producing a
printed copy will be deemed to be execution and delivery of this Agreement as of
the date set forth on page one of this Agreement.

8.

Proper Law

 

8.1

This Amending Agreement will be governed by and construed in accordance with the
law of British Columbia.

 

 

--------------------------------------------------------------------------------

- 4 -

 

 

 

9.

Time of the Essence

 

9.1

Time is of the essence of this Agreement.

IN WITNESS WHEREOF the parties hereto have executed this Agreement as of the
date first above written.

ARGENTEX MINING CORPORATION

 

 

Per:

/s/ Ken Hicks

Name:

Ken Hicks

 

Title:

President

 

 

EXECUTED by CHRISTOPHER IAN DYAKOWSKI in the presence of:

/s/ J. Dyakowska                                                           
Signature
J. Dyakowska                                                                  
Print Name
3750 W. 4th Ave.                                                          
Address
Vancouver, BC                                                              

Teacher                                          
                                   
Occupation

)
)
)
)
)
)
)
)
)
)
)
)
)

/s/ Christopher Ian Dyakowski                            
CHRISTOPHER IAN DYAKOWSKI