In New California Gold Rush, Old Mines Reopen David Cochrane examining the walls of a Sutter Gold tunnel dug by miners following a vein. “Right there, see?” he said, spotting a speck of gold. By JESSE McKINLEY Published: February 10, 2011 SUTTER CREEK, Calif. — Standing in a cramped, slanted and slippery crevice some 500 feet below…