Hopalong Mine, Juneau District, Skagway-Hoonah-Angoon Borough, Alaska, USA
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Location: The mine is on the east side of Reid Inlet about two miles south of the mouth at an elevation of about 1350 feet. Location is accurate to about 0.15 mile. It is location number 27 of Cobb (1972).
Geology: The Hopalong mine is in diorite or quartz diorite of Cretaceous age that contains inliers and irregular masses of hornfels of Paleozoic age (Brew and others, 1978). The granitic rocks are cut by north-striking nearly vertical veins, as much as 1 foot thick, that pinch and swell. Individual veins can be traced for 60 feet and contain quartz, abundant calcite, minor muscovite, pyrite and arsenopyrite. Surface parts of some of the veins, possibly enriched by surface leaching, contained native gold.
Workings: Surface sluicing of weathered veins produced some free gold (Rossman, B 1058-B, p. 56). The Hopalong claims were staked by Joe Ibach in 1943 (Kimball and others, 1978, p. C236).
Age: Late Cretaceous or younger.
Production: Minor production of gold from ground sluicing weathered outcrops.
Reserves: None.
Commodities (Major) - Au
Development Status: Yes; small
Deposit Model: Low-sulfide gold-quartz vein (Cox and Singer, 1986; model 36a).
Mineral List
6 entries listed. 6 valid minerals.
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References
Brew, D.A., Johnson, B.R., Grybeck, D., Griscom, A., Barnes, D.F., Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources of the Glacier Bay National Monument Wilderness Study Area, Alaska: U.S. Geological Survey Open-File Report 78-494, 670 p., 7 sheets. Cobb, E.H., 1972, Metallic mineral resources map of the Mount Fairweather quadrangle, AK: U.S. Geological Survey Miscellaneous Field Study Map MF-436, 1 sheet, scale 1:250,000. Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources, in Brew, D. A., and others, Mineral resources of the Glacier Bay National Monument wilderness study area, Alaska: U.S. Geological Survey Open-File Report 78-494, p. C1-C375. MacKevett, E.M., Jr., Brew, D.A., Hawley, C.C., Huff, L.C., and Smith, J.G., 1971, Mineral resources of Glacier Bay National Monument, Alaska: U.S. Geological Survey Professional Paper 632, 90 p., 12 plates, scale 1:250,000. Rossman, Darwin, 1959, Geology and ore deposits in the Reid Inlet area, Glacier Bay, Alaska: U.S. Geological Survey Bulletin 1058-B, p. 33-58.
