Mine detail: Opal

Previously called ''

<< Back to the map

Location

Lat / long:

61.81956, -149.21269

Resource(M)

Primary:	Gold
Ore:	Gold, Pyrite
Gangue:	Quartz

Production

Operation type:	Unknown
Development status:	Prospect

Geology

Alteration processes:

Wall-rock alteration within a few inches of the veins is intense, but seldom extends more than 10 to 12 inches beyond the quartz filling. Sericitization and carbonate alteration predominate, but there is some pyritization and in the outer parts of the alteration zone chloritization is present (Ray, 1954).

References

MRDS	A011630
DEP	10000960
Reference	{Deposit:: Chapin, Theodore, 1921, Lode developments in the Willow Creek district: U.S. Geological Survey Bulletin 714-E, p. 201-206.}{Deposit:: Brooks, A.H. and Capps, S.R., 1924, Mineral industry in Alaska, 1922: U.S. Geological Survey Bulletin 755, p. 1-56.}{Deposit:: Brooks, A.H., 1925, Alask * mineral resources and production, 1923: U.S. Geological Survey Bulletin 773, p. 3-52.}{Deposit:: Cobb, E.H., 1972, Metallic mineral resources map of the Anchorage Quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-409, 1 sheet, scale 1:250,000.}{Deposit:: MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.}{Deposit:: Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials in Anchorage quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-1095, 184 p.}
Reporter	S.W. Huss, D.P. Bickerstaff