Callahan Mine (Harborside Mine; Cape Rosier Mine; Rosier Consolidated Mine), Brooksville, Hancock Co., Maine, USA
ChalcopyriteCallahan Mine, Brooksville, Hancock Co., Maine, USA
Latitude: 44°20'46"N
Longitude: 68°48'27"W
The Callahan Mine, initially an underground operation with three shafts, and later a 150 acre zinc-copper open pit mine, is located approximately 1,000 feet east-southeast of Harborside Village. It is a massive sulfide deposit, consisting primarily of sphalerite and chalcopyrite, and was discovered in 1880 at low tide by a clam digger. Mining was conducted adjacent to and beneath a tidal estuary (Goose Pond).
The mine's first period of operation ended in 1887. There were sporadic efforts at mining until 1964, and then Callahan Mining Corporation began major open pit operations in 1968. The mine was approximately 600 to 1,000 feet in diameter and 320 feet deep. Almost 800,000 tons of ore and 5 million tons of waste rock were removed from the mine. The average ore grade was 1.30% copper, 4.91% zinc, 0.35% lead, and 0.50 ounces per ton of silver. The mine closed in 1972 and was flooded by the opening of a dam at Goose Pond.
References
Gregory, G. E. (1969). The Callahan Mine, Cape Rosier, Maine:
Gems and Minerals, no. 380, p. 24-26.
Bouley, Bruce A. and Hodder, Robert W. (1984). Strata-bound massive sulfide deposits in Silurian-Devonian volcanic rocks at Harborside, Maine.
Economic Geology; November 1984; v. 79; no. 7; p. 1693-1702.
King, V. and Foord, E. (1994). Mineralogy of Maine, vol 1.
External Links
http://www.epa.gov/region1/superfund/sites/callahan US Environmental Protection Agency
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