Unnamed (east of mouth of Hawk Inlet)

Occurrence, Active

Commodities and mineralogy

Main commodities As; Cd; Sb; Zn
Ore minerals pyrite
Gangue minerals mariposite; quartz

Geographic location

Quadrangle map, 1:250,000-scale JU
Quadrangle map, 1:63,360-scale A-3
Latitude 58.1018
Longitude -134.6771
Nearby scientific data Find additional scientific data near this location
Location and accuracy 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.

Geologic setting

Geologic description

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).
Geologic map unit (-134.678881021528, 58.1014645605915)

Production and reserves

Indication of production None

References

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.
Reporters J.C. Barnett and L.D. Miller (Juneau, Alaska )
Last report date 12/15/2001