KEYSTONE MINES LTD
AGREEMENT TO EXTEND PAYMENT OF PROMISSORY NOTE.
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<DESCRIPTION>AGREEMENT TO EXTEND PAYMENT OF PROMISSORY NOTE.
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<TITLE>Exhibit 10.1 For Keystone Mines Limited</TITLE>
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<P>Exhibit 10.1</P>

<P>Montreal, January 28, 2003</P>

<P>&nbsp;</P>
<P>Keystone Mines Limited<br>
St&eacute;phane Solis, President &amp; CEO<br>
4710, St-Ambroise, Suite 224A<br>
Montreal, QC<br>
H4C 2C7</P>

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<B><U><P>Object: Payment of a Notes of US$500,000 to Capex Investments Limited </U></P>

<P>&nbsp;</P>
</B><P>Dear Mr. Solis;</P>

<P>As discussed, for the payment of the Promissory Notes issued on January 7, 2003 by Keystone Mines Limited to Capex Investments Limited as partial payment for the purchase all assets related to the C-Chip technology, Capex Investments Limited hereby agrees to extend its due payment date of the above Promissory Notes from January 31, 2003 to the sooner of either February 28, 2003 or on the day of a closing of a private placement by Keystone Mines Limited.</P>

<P>Sincerely,</P>

<P>/s/ Robert Clarke<br>
Capex Investments Limited</P>


<P>If you agree to the above, please sign below.</P>


<P>/s/ Stephane Solis<br>
Keystone Mines Limited,<br>
St&eacute;phane Solis, President &amp; CEO</P>

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