CALGARY, ALBERTA — (Marketwire) — 12/20/12 — Silver Mountain Mines Inc. (TSX VENTURE: SMM) ("Silver Mountain" or the "Company") announces that it has submitted an application to extend the expiry dates of a total of 8,675,584 common share purchase warrants issued as part of a its 2008, 2009, 2010 and 2011 private placements.A total of 1,776,100 common share purchase warrants ("2008 Warrants"), consisting of 930,000 common share purchase warrants at an exercise