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Thomas-Culross Mining Co.; Bugaboo; Chelan; Culross; Culross Island Mining Mine, Prince William Sound District, Valdez-Cordova Borough, Alaska, USA

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Location: This mine is located in the SW1/4 section 35, T. 8 N., R. 7 E., of the Seward Meridian. It is at an elevation of 300 feet above sea level, on the east side of Culross Bay about 1,500 feet from shore. This is location 106 of MacKevett and Holloway (1977), location 169 of Cobb and Tysdal (1980), and location S-102 of Jansons and others (1984). Cobb and Tysdal (1980) summarized the relevant references under the name Thomas-Culross. This location is accurate to within 300 feet.
Geology: The Thomas-Culross mine is within the Contact Fault zone, a major thrust fault that juxtaposes the Valdez Group of Late Cretaceous age with the Orca Group of Teriary age. The Contact Fault zone formed 65 million to 35 million years ago and ranges from 1 to 6 miles wide. Within this zone are numerous discrete shears. The general trend of the Contact Fault zone is northeast, but the strike of individual shears may vary widely. The country rocks at the mine consist of sheared Orca Group greenstone, which is rehealed by quartz veins that contain arsenopyrite, chalcopyrite, galena, pyrrhotite, sphalerite, and gold. Slate and graywacke outcrop about 50 feet north of the portal. The shear zone is traceable for about 900 feet and strikes N10E with a vertical dip (Johnson, 1914 [B 592-G, p. 235-236]). The quartz veins within the zone range from 1 to 14 inches wide and show banding; some arsenopyrite is disseminated in the surrounding wall rock (Johnson, 1914 [B 592-G, p. 235-236]). The extensive workings on the property were developed over a period of about 30 years. There are a total of 720 feet of adits and drifts, along with a 180-foot raise. A 1,350-foot-long aerial tramway connected the mine to a 10-foot Chilean mill (Jansons and others, 1984). Estimated production from this mine is 62 ounces of gold and 52 ounces of silver (Jansons and others, 1984).
Workings: The extensive workings on the property were developed over a period of about 30 years. There are a total of 720 feet of adits and drifts, along with a 180 foot raise. A 1,350-foot aerial tramway connected the mine to a 10 foot Chilean Mill near the beach (Jansons and others, 1984). Estimated production from this mine is 62 ounces of gold and 52 ounces of silver (Jansons and others, 1984). The U.S. Bureau of Mines collected multiple samples from this property that assayed from trace to 14.8 ppm gold and trace to 6.5 ppm silver. (Jansons and others, 1984).
Age: Eocene or younger; the mineralized shear cuts Eocene greenstone of the Orca Group of Tertiary age.
Production: Estimated production from this mine is 62 ounces of gold and 52 ounces of silver (Jansons and others, 1984).
Reserves: The U.S. Bureau of Mines estimated an indicated reserve of 8,600 tons at 5.5 ppm gold and 3.4 ppm silver (Jansons and others, 1984).

Commodities (Major) - Au; (Minor) - Ag, Cu, Pb, Zn
Development Status: Yes; small
Deposit Model: Low-sulfide Au-quartz vein (Cox and Singer, 1986; model 36a)

Mineral List



7 entries listed. 7 valid minerals.

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References

Brooks, A.H., and Capps, S.R., 1924, The Alaska mining industry in 1922: U.S. Geological Survey Bulletin 755-A, p. 1-56. Cobb, E.H., and Richter, D.H., 1972, Metallic mineral resources map of the Seward quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-466, 2 sheets, scale 1:250,000. Cobb, E.H., and Tysdal, R.G., 1980, Summaries of data on and list of references to metallic and selected nonmetallic mineral deposits in the Blying Sound and Seward quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-621, 276 p. Condon, W.H., and Cass, J.T., 1958, Map of a part of the Prince William Sound area, Alaska, showing linear geologic features as shown on aerial photographs: U.S. Geological Survey Miscellaneous Investigations Series Map I-273, 1 sheet, scale 1:125,000. Jansons, Uldis, Hoekzema, R.B., Kurtak, J.M., and Fechner, S.A., 1984, Mineral occurrences in the Chugach National Forest, southcentral Alaska: U.S. Bureau of Mines Mineral Land Assessment 5-84, 218 p., 2 sheets, scale 1:250,000. Johnson, B.L., 1914, The Port Wells gold-lode district, Alaska: U.S. Geological Survey Bulletin 592-G, p. 195-236. Johnson, B.L., 1915, Mining on Prince William Sound: U.S. Geological Survey Bulletin 622-E, p. 131-139. Johnson, B.L., 1916, Mining on Prince William Sound: U.S. Geological Survey Bulletin 642-D, p. 137-145. 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. Moffit, F.H., 1927, Mineral industry in Alaska in 1925: U.S. Geological Survey Bulletin 792-A, p. 1-39. Moffit, F.H., 1954, Geology of the Prince William Sound region, Alaska: U.S. Geological Survey Bulletin 989-E, p. 225-310. Smith, P.S., 1929, Mineral industry of Alaska in 1926: U.S. Geological Survey Bulletin 797, p. 1-50. Smith, P.S., 1941, Mineral industry of Alaska in 1939: U.S. Geological Survey Bulletin 926-A, p. 1-106. Smith, S.S., 1917, The mining industry in the Territory of Alaska during the calendar year 1915: U.S. Bureau of Mines Bulletin 142, 65 p. Smith, S.S., 1917, The mining industry in the Territory of Alaska during the calendar year 1916: U.S. Bureau of Mines Bulletin 153, 89 p. Tysdal, R.G., 1978, Mines, prospects, and occurrences map of the Seward and Blying Sound quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-880-A, 2 sheets, scale 1:250,000.

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