Sunrise Prospect, Juneau District, Skagway-Hoonah-Angoon Borough, Alaska, USA
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Location: The Sunrise is on the east side of Reid Inlet about 1 mile south of the mouth of the inlet at an elevation of about 800 feet. The deposit is uncertainly located. Claims were staked by Joe Ibach and Rex Beach in 1937 between the beach to at least 800 feet elevation. Rossman (1959, B 1058-B) reports a vein at about 700 feet elevation possibly traceable for several thousand feet in badly shattered sedimentary rock. The prospect is location number 26 of Cobb (1972).
Geology: Country rocks are mainly hornfels and marble of Paleozoic age (Brew and others, 1978). The rocks are cut by mafic (lamprophyric) dikes and small granitic intrusions and are badly broken. Subparallel quartz-calcite veins occur in north-striking, steeply-dipping marble and hornfels. Veins investigated by the U.S. Geological Survey in 1966 (MacKevett and others, 1971, p. 62-63, loc. H, table 11) were discontinuous, 2-12 inches thick and 20-40 feet long. Quartz veins in the lamprophyre dikes contain pyrite, which is also disseminated in the dike rock. Reed (1938) reported a vein that contained 0.08 ounce per ton gold. Rossman (1959, p. 56) reported scheelite in a quartz vein. Negligible amounts of metals were found by Kimball and others (1978) in their study of the area.
Workings: Surface workings; it is uncertain if original claims staked by Ibach-Beach were found by later workers.
Age: Cretaceous or younger.
Production: Possibly some gold sluiced off weathered outcrops.
Commodities (Major) - Au; (Minor) - Ag, W
Development Status: No
Deposit Model: Low-sulfide gold-quartz vein (Cox and Singer, 1986; model 36a).
Mineral List
7 entries listed. 7 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. Reed, J.C., 1938, Some mineral deposits of Glacier Bay and vicinity, Alaska: Economic Geology, v. 33, p. 52-80. 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.
