In this photo taken Thursday, Dec. 13, 2012, Matt Collins, chief 

In this photo taken Thursday, Dec. 13, 2012,  Matt Collins, chief operating officer of the Sutter Gold Mining Co., inspects one of the gold mining tunnels operated by the company near Sutter Creek, Calif.  The company, which has begun mining adjacent to the historic Comet-Lincoln ore zones,  announced Monday, Dec. 17, 2012, that it poured its first gold as it prepared to begin the first large scale Sierra Nevada underground  gold mining in a half century. (AP Photo/Rich Pedroncelli)
Associated Press
In this photo taken Thursday, Dec. 13, 2012, Matt Collins, chief operating officer of the Sutter Gold Mining Co., inspects one of the gold mining tunnels operated by the company near Sutter Creek, Calif. The company, which has begun mining adjacent to the historic Comet-Lincoln ore zones, announced Monday, Dec. 17, 2012, that it poured its first gold as it prepared to begin the first large scale Sierra Nevada underground gold mining in a half century. (AP Photo/Rich Pedroncelli)
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