There is no discrepancy.

The Velardena 2009 resource report contains M&I 40 silver eq. ounces which includes silver, gold and base metals. In your calculation you didn't multiply the 300,000 ounces of gold to convert to silver nor account for the M&I base metals.

You need to take the M&I 71.7 million silver eq. ounces on the fact sheet and subtract 32 million M&I silver eq. ounces of El Quevar from this to arrive at 39.7 million silver eq. ounces for Velardena and San Diego combined, all metals.