Egnaty Creek

Prospect, Inactive

Commodities and mineralogy

Main commodities Hg
Ore minerals cinnabar
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SM
Quadrangle map, 1:63,360-scale D-5
Latitude 61.86648
Longitude -157.87423
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is about 0.5 kilometers upstream the mouth of an unnamed creek that is locally called Egnaty Creek; its mouth is on the the south side of the Kuskokwim River about 1.6 mile east of the mouth of Central Creek . It is at an elevation of about 300 feet near the center of section 34, T. 21 N., R. 47 W., of the Seward Meridian. The location is accurate. The prospect is locality 6 of Miller and others (1989).

Geologic setting

Geologic description

The Egnaty Creek prospect consists of fine-grained cinnabar in shear zones and fractures in sandstone and siltstone of the Upper Cretaceous, Kuskokwim Group (Cady and others, 1955; Maloney, 1968). The rocks strike about S35W and dip 45 to 50S. The mercury is mainly disseminated; a few select samples contained about 1.0 percent mercury (Meyers, 1985). No igneous rocks were recognized at the prospect Maloney (1968) described an exploration program at the prospect; cinnabar was found in 100 of 350 auger holes drilled here. No other information is available.
Geologic map unit (-157.87662659816, 61.8657833478784)
Mineral deposit model Silica-carbonate mercury? (Cox and Singer, 1986; model 27c).
Mineral deposit model number 27c?

Production and reserves

Workings or exploration The Egnaty Creek prospect was staked by John Murphy and George Willis in 1966, after following up the anomalies from a panned-concentrate sample program on Egnaty Creek (Meyer, 1985). The U.S. Bureau of Mines conducted a soil-auger drill program in 1967 and found found cinnabar in 100 of 350 auger holes (Maloney, 1968). Rock samples collected by the U.S. Bureau of Mines contained up to 1.0 percent mercury (Meyers, 1985). Bulk sampling, trenching, limited diamond drilling, and additional soil sampling were also done (Miller and others, 1989).
Indication of production None

References

MRDS Number A013427

References

Gray, J.E., Gent, C.A., Snee, L.W., and Wilson, F.H., 1997, Epithermal mercury-antimony and gold-bearing vein lodes of southwest Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 287-305.
Wells, J.T., and Ghiorso, M.S., 1988, Rock alteration, mercury transport, and metal deposition at Sulphur Bank, California: Economic Geology, vol. 83, p. 606-618.
White, D. E., and Robinson, C. E., 1962, Sulphur Bank, California, a major hot spring quicksilver deposit, in Engel, A.E.J., James, H.L., and Leonard, B.F., eds., Petrologic studies: A volume in honor of A.F. Buddington: Boulder, Colorado, Geological Society of America p. 397-428.
Reporters T.K. Bundtzen (Pacific Rim Geological Consulting, Inc.) and M.L. Miller (U.S. Geological Survey)
Last report date 5/3/2003