Alaska Dano; War Horse Mine, Admiralty District, Skagway-Hoonah-Angoon Borough, Alaska, USA
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Geology: This deposit was discovered in 1897 (Wells and others, 1986). It consists of multiple quartz veins that both conform to and crosscut mica schist and chlorite schist (Cobb, 1978 [OFR 78-374]). There is a small exposure of granitic rock near the mine. The deposit can be traced southeast along strike to the Nowell-Otterson prospects (JU236). Most of the veins are 0.5 to 2 feet thick; a few are up to 20 feet thick. They consist of quartz and calcite that contain pyrite, pyrrhotite, galena, chalcopyrite, native gold, sphalerite, specular hematite, and secondary copper and iron minerals. Pyrite-rich quartz lenses also occur in the slate. Mine workings include more than 400 feet of tunnels and drifts, 2 shafts, and surface cuts. The mine has documented production of less than 100 ounces of gold, but part of the 15,000-ounce gold production of the Alaska-Admiralty Mine (JU224) probably was from the Alaska Dano Mine (Cobb, 1978 [OFR 78-374]). The rocks in the general area are mainly Ordovician and Devonian to Triassic, clastic units, mafic-intermediate volcanic rocks, and subordinate limestone. The bedded rocks are intruded and locally metamorphosed by Cretaceous granodiorite (Gehrels and Berg, 1994).
Workings: This deposit was discovered in 1897 (Wells and others, 1986). Mine workings include more than 400 feet of tunnels and drifts, 2 shafts, and surface cuts.
Alteration: Local oxidation of copper and iron minerals.
Production: The mine has documented production of less than 100 ounces of gold, but part of the 15,000-ounce gold production of the Alaska-Admiralty Mine (JU224) probably came from the Alaska Dano Mine (Cobb, 1978 [OFR 78-374]).
Commodities (Major) - Ag, Au, Cu, Pb, Zn
Development Status: Yes; small
9 entries listed. 9 valid minerals.
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Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Juneau quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-374, 155 p. Gehrels, G.E., and Berg, H.C., 1994, Geology of southeastern Alaska, in Plafker, George, and Berg, H. C., eds., The geology of Alaska: Geological Society of America, DNAG, The geology of North America, Vol. G-1, p. 451-467. Wells, D.E., Pittman, T.L., Brew, D.A. and Douglass, S.L., 1986, Map and description of the mineral deposits in the Juneau, Taku River, Atlin, and part of the Skagway quadrangles, Alaska: U.S. Geological Survey Open-File Report 85-717, 332 p., 1 sheet, scale 1:250,000.