The Arnold Mine began exploration work on the Ashbed Amygdaloid in 1860 and incorporated in 1863 with the completion of its only shaft. The mine was worked sporadically until 1900 when all worked ceased. Approx. 2 million lbs. of refined copper was recovered.
References
Butler, B.S., and Burbank, W.S., 1929, The Copper Deposits of Michigan. U.S. Geological Survey. Professional Paper 144. 238 pp.
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