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McCullough; Lake Bay Prospect, Sweetwater Lake, Prince of Wales Island, Ketchikan District, Prince of Wales-Outer Ketchikan Borough, Alaska, USA

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Location: The McCullough Mine is about 1.2 miles west of the mouth of Galligan Creek on Gold and Galligan Lagoon; it is about 0.4 mile northwest of the center of section 14, T. 68 S., R. 80 E. The location is accurate. A map of the area and the workings of the mine are shown on figure 71 of Maas and others (1995).
Geology: The rocks in the vicinity of the McCullough Mine are mainly graywacke and argillite of the Silurian and Ordovician, Descon Formation (Eberlein and others, 1983; Brew, 1996) The deposit consists of a breccia vein 10 to 15 feet wide that is exposed in workings for about 300 feet (Maas and others, 1995). The vein consists of fragments of graywacke and argillite with pyrite, chalcopyrite, and sphalerite, in a quartz-calcite gangue. The vein has been sampled several times; the copper content typically is 1 to 3 percent (Townsend, 1945, 1946; Herbert and Race, 1965; Maas and others, 1995). Most older analyses show little or no gold, but a recent sample of high-grade material contained 4.39 percent copper, 68 parts per billion (ppb) gold, and 11.9 parts per million silver. A continuous chip sample across 0.9 meter of the vein contained 120 ppb gold (Maas and others, 1995). The deposit was discovered in 1903 and a 4-ton test sample that contained about 5 percent copper was shipped in 1905 and 1906 (Roppel, 1991) . The workings consist of two shafts, one 71 feet deep, and numerous cuts along the vein. There was intermittent work until 1922 but there was no production. The deposit was restaked in 1929 and the workings were extended from the bottom of the 71-foot shaft. The deposit was examined by Harry Townsend in 1945 for the Anaconda Copper Mining Company. He did some limited exploration trenching and sampling but Anaconda did not acquire the property.
Workings: The deposit was discovered in 1903 and a 4-ton test sample that contained about 5 percent copper was shipped in 1905 and 1906 (Roppel, 1991) . The workings consist of two shafts, one 71 feet deep, and numerous cuts along the vein. There was intermittent work until 1922 but apparently no production. The deposit was restaked in 1929 and the workings were extended from the bottom of the 71-foot shaft. The deposit was examined by Harry Townsend in 1945 for the Anaconda Copper Mining Company. He did some limited exploration trenching and sampling but Anaconda did not acquire the property.
Age: The vein is younger than the Silurian or Ordovician sedimentary host rocks.
Production: Only a 4-ton test shipment in 1905 and 1906.
Reserves: None.

Commodities (Major) - Cu; (Minor) - Ag, Au

Mineral List



5 entries listed. 5 valid minerals.

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References

Brew, D.A., 1996, Geologic map of the Craig, Dixon Entrance, and parts of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2319, 53 p., 1 sheet, scale 1:250,000. Brooks, A.H., 1915, Mineral resources of Alaska; report on progress of investigations in 1914: U.S. Geological Survey Bulletin 622, 380 p. Brooks, A.H., and Capps, S.R., 1924, The Alaska mining industry in 1922: U.S. Geological Survey Bulletin 755-A, p. 1-56. Buddington, A.F., 1926, Mineral investigations in southeastern Alaska: U.S. Geological Survey Bulletin 783, p. 41-62. Chapin, Theodore, 1916, Mining developments in southeastern Alaska: U.S. Geological Survey Bulletin 642-B, p. 73-104. Cobb, E. H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Craig quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-869, 262 p. Eberlein, G.D., Churkin, Michael, Jr., Carter, Claire, Berg, H.C., and Ovenshine, A. T., 1983, Geology of the Craig quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-91, 52 p. Herbert, C.F., and Race, W.H., 1965, Geochemical investigations of selected areas in southeastern Alaska, 1964 and 1965: Alaska Division of Mines and Minerals Geochemical Report 6, 67 p., 4 sheets, scale 1:63,360. Houston, J.R., Bates, R.G., Velikanje, R.S., and Wedow, Helmuth, Jr., 1958, Reconnaissance for radioactive deposits in southeastern Alaska, 1952: U.S. Geological Survey Bulletin 1058-A, p. 1-31. Maas, K.M., Bittenbender, P E., and Still, J.C., 1995, Mineral investigations in the Ketchikan mining district, southeastern Alaska: U.S. Bureau of Mines Open-File Report 11-95, 606 p. Maas, K.M., Still, J. C., and Bittenbender, P. E., 1992, Mineral investigations in the Ketchikan mining district, Alaska, 1991 - Prince of Wales Island and vicinity: U.S. Bureau of Mines Open-File Report 81-92, 69 p. Roppel, Patricia, 1991, Fortunes from the earth: Manhattan, Kansas, Sunflower University Press, 139 p. Smith, P.S., 1926, Mineral industry of Alaska in 1924: U.S. Geological Survey Bulletin 783-A, p. 1-30. Townsend, Harry, 1945, Preliminary report, Lake Bay copper prospect, Prince of Wales Island: Anaconda Copper Mining Company, 5 p. (Unpublished report held as file 6357, Anaconda Collection, American Heritage Center, University of Wyoming, Laramie.) Townsend, Harry, 1946, Supplemental report, Lake Bay copper prospect, Prince of Wales Island: Anaconda Copper Mining Company, 4 p. (Unpublished report held as file 6357, Anaconda Collection, American Heritage Center, University of Wyoming, Laramie.) Twenhofel, W.S., Reed, J. C., and Gates, G.O., 1949, Some mineral investigations in southeastern Alaska: U.S. Geological Survey Bulletin 963-A, p. 1-45.

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