Location: This occurrence is at an elevation of approximately 2,300 feet on a feature locally called Mariposite Ridge. It is 3 miles southeast of the Hawk Inlet docks and transfer facility, 5 miles west of Eagle Peak, and 2 miles northwest of the Greens Creek Mine (JU253). It is near the center of the NE1/4 section 31, T. 43 S., R. 66 E. of the Copper River Meridian. The location is accurate within 1/4 mile.
Geology: This occurrence consists of a persistent shear zone in carbonate rocks that contains 5 to 10 percent mariposite and pyrite-bearing quartz stringers. Samples collected in 1983 contained traces of zinc, arsenic, cadmium, and antimony (Wells and others, 1986). 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).
Commodities (Major) - As, Cd, Sb, Zn
Development Status: None
References:
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.
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Map Reference: 58°6'6"N , 134°40'37"W
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3 entries listed. 2 valid minerals.
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