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London and Cape

Prospect, Inactive

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Commodities and mineralogy

Main commodities Cu
Other commodities Ag; Mo
Ore minerals chalcopyrite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale C-8
Latitude 61.5666
Longitude -143.7166
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is on the ridge between MacDougal and Trail creeks. It is at an elevation of about 4,600 feet, 700 feet northeast of elevation 5120, and about 1,500 feet east-northeast of the center of section 35, T. 3 S., R. 9 E. of the Copper River Meridian. This is locality 129 of MacKevett (1976) and locality 33 of MacKevett and others (1978). The location is accurate to within 100 feet. Cobb and MacKevett (1980) included this prospect under the name 'London & Cape (Co.)'.

Geologic setting

Geologic description

This prospect consists of pyrite-and chalcopyrite-bearing veinlets and disseminations in locally altered Jurassic granodiorite (MacKevett, 1976; MacKevett and others, 1978). Samples of the mineralization contain up to 1.5 parts per million (ppm) silver, 20,000 ppm copper, and 70 ppm molybdenum but most samples contain less than 1,000 ppm copper. Fourteen claims were patented in 1909 and early exploration included a 245-foot-long adit (Moffit and Mertie, 1923). Some exploration took place in the 1970s (MacKevett, 1976).
Geologic map unit (-143.718684835424, 61.5661416487361)
Mineral deposit model Porphyry Cu (Cox and Singer, 1986; model 17)
Mineral deposit model number 17
Age of mineralization Jurassic. The age of the host intrusive rock is Late Jurassic.
Alteration of deposit Alteration is present but it has not been described. Iron-staining is probably present.

Production and reserves

Workings or exploration Fourteen claims were patented in 1909 and early exploration included a 245-foot-long adit (Moffit and Mertie, 1923). Some exploration took place in the 1970s (MacKevett, 1976).
Indication of production None

Additional comments

The locality is in the Wrangell-Saint Elias National Park and Preserve.

References

MRDS Number A011735

References

Cobb, E.H., and MacKevett, E.M., Jr., 1980, Summaries of data on and lists of references to metallic and selected nonmetallic mineral deposits in the McCarthy quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-885, 156 p.
MacKevett, E.M., Jr., 1976, Mineral deposits and occurrences in the McCarthy quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-773-B, 2 sheets, scale 1:250,000.
MacKevett, E.M., Jr., Smith, J.G., Jones, D.L., and Winkler, G.R., 1978, Geologic map of the McCarthy C-8 quadrangle, Alaska: U.S. Geological Survey Geologic Quadrangle Map GQ-1418, 1 sheet, scale 1:63,360.
Moffit, F.H., and Mertie, J.B., Jr., 1923, The Kotsina-Kuskulana district, Alaska: U.S. Geological Survey Bulletin 745, 149 p.
Reporters Travis L. Hudson (Applied Geology, Inc.)
Last report date 1/12/2003