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Mine: Douglas Houghton Mine, Mass, MI

An underground copper mine consisting of 4 shafts, 1 adit, and 6 levels. Began as the Douglass Houghton Mine in 1846 and continued until 1864, at which time the mine was sold to Henwood Mines Corporation which closed the mine 1865. The had produced approx. 150,000 lbs. of refined copper. [MINDAT]