|Quadrangle map, 1:250,000-scale||SR|
|Quadrangle map, 1:63,360-scale||A-3|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The mine is located one-half mile southeast of Powder Point on the west side of Latouche Island. It is in the NE1/4 section 33, T. 1 S., R. 9 E., of the Seward Meridian. The Beatson mine is shown on the 1988 revision of the 1:63,360 U.S. Geological Survey topographic map. This is location 256 of Cobb and Tysdal (1980) and location S-17 of Jansons and others (1984). This location is accurate to within 300 feet.|
Geologic descriptionThe country rock in the mine area consists of a north-trending, interbedded sequence of west-dipping slate and graywacke, with graywacke predominating (Kurtak and Jeske, 1986). Nelson and others (1985) mapped this rock as Orca Group of early Tertiary age. The major structural feature in the mine area is the Beatson fault, which cuts slightly across bedding, strikes about N 12 E and dips (on average) 60 W. On the footwall of the fault, ore occurs as a massive and disseminated sulfide zone. The highest grade ore occurs adjacent to the fault (Kurtak and Jeske, 1986). The ore body is roughly 400 feet wide by 500 feet vertical and extends for 1,000 feet along strike. Sulfide minerals consist of pyrite, pyrrhotite, chalcopyrite, cubanite, galena, silver, and sphalerite; gold and silver are also present. Gangue minerals consist of quartz, sericite, and ankerite. The average ore grade was 1.7 percent copper and 0.27 ounce of silver per ton. Total production was 5,992,941 tons of ore grading 1.65 percent copper and 0.279 ounce of silver (Kurtak and Jeske, 1986).
|Geologic map unit||(-147.901517783894, 60.0486593561929)|
|Mineral deposit model||Besshi massive sulfide (Cox and Singer, 1986; model 24b)|
|Mineral deposit model number||24b|
|Age of mineralization||Tertiary or younger; the mineralization is in rocks of the Orca Group of Tertiary age.|
|Alteration of deposit||There is strong silicification of the footwall rock. There is chloritic alteration of the hanging wall rock (Rogers and Hoyt, 1999).|
|Workings or exploration||From 1908 to 1930, the deposit was mined by both open cut and underground shrinkage stope methods. There were 10 miles of underground workings when mining ended in 1930 (Kurtak and Jeske, 1986). Improvements on the property included the town of Latouche, a wharf, and a diesel power plant. Production totaled 182,600,000 pounds of copper and 1,466,649 ounces of silver from 5,992,941 tons of ore. The average copper grade was 1.65 percent, and the average silver grade was 0.279 ounce per ton (Kurtak and Jeske, 1986).|
|Indication of production||Yes; large|
|Reserve estimates||Rogers and Hoyt (1999) report a reserve of 3,000,000 tons.|
|Production notes||Production totaled 182,600,000 pounds of copper and 1,466,649 ounces of silver from 5,992,941 tons of ore. The average copper grade was 1.65 percent, and the average silver grade was 0.279 ounce per ton (Kurtak and Jeske, 1986).|
|MRDS Number||A010628; A101673|
Bateman, A.N., 1924, Geology of the Beatson copper mine, Alaska: Economic Geology, v. 19, p. 339-368.
Berg, H.C., and Cobb, E.H., 1967, Metalliferous lode deposits of Alaska: U.S. Geological Survey Bulletin 1246, 254 p.
Brooks, A.H., 1912, The mining industry in 1911, in Brooks, A.H., and others, Mineral resources of Alaska, report on progress of investigations in 1911: U.S. Geological Survey Bulletin 520-A, p. 17-44.
Brooks, A.H., 1921, The future of Alaska mining, in Martin, G.C., and others, Mineral resources of Alaska, 1917: U.S. Geological Survey Bulletin 714-A, p. 5-57.
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.
Crowe, D.E., Nelson, S.W., Brown, P.E., Valley, J.W., and Shanks, W.C., III, 1992, Geology and geochemistry of volcanogenic massive sulfide deposits and related igneous rocks, Prince William Sound region, south-central Alaska: Economic Geology, v. 87, no. 7, p. 1722-1746.
Grant, U.S., 1906, Copper and other mineral resources of Prince William Sound: U.S. Geological Survey Bulletin 284, p. 78-87.
Grant, U.S., and Higgins, D.F., Jr., 1909, Notes on geology and mineral prospects in the vicinity of Seward, Kenai Peninsula: U.S. Geological Survey Bulletin 379-C, p. 98-107.
Grant, U.S., and Higgins, D.F., Jr., 1910, Reconnaissance of the geology and mineral resources of Prince William Sound, Alaska: U.S. Geological Survey Bulletin 443, 89 p.
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., 1918, Mining on Prince William Sound: U.S. Geological Survey Bulletin 662-C, p. 183-192.
Kurtak, J.M., and Jeske, R.E., 1986, Mineral investigations in the Chugach National Forest, Alaska (Islands area): U.S. Bureau of Mines Open-File Report 54-86, 302 p., 1 sheet, scale 1:63,360.
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.
Martin, G.C., 1919, Alaska Mining Industry in 1917: U.S. Geological Survey Bulletin 692-A, p. 11-42.
Moffit, F.H., 1908, Notes on copper prospects of Prince William Sound: U.S. Geological Survey Bulletin 345-C, p. 176-178.
Moffit, F.H., 1954, Geology of the Prince William Sound region, Alaska: U.S. Geological Survey Bulletin 989-E, p. 225-310.
Moffit, F.H., and Fellows, R.E., 1950, Coper deposits of the Prince William Sound district, Alaska: U.S. Geological Survey Bulletin 963-B, p. 47-80.
Nelson, S.W., Dumoulin, J. A., and Miller, M.L., 1985, Geologic map of the Chugach National Forest, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1645-B, 16 p., 1 sheet, scale 1:250,000.
Rogers, R., and Hoyt, M., 1999, Mineral prospects on Chugach Alaska Corporation lands: Chugach Alaska Corporation in-house report, 10 p., 1 table, 10 maps.
Shacklette, H.T., 1965, Bryophytes associated with mineral deposits and solutions in Alaska: U.S. Geological Survey Bulletin 1198-C, p. C1-C18.
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.
Stejer, F.A., 1956, Pyrite deposits at Horseshoe Bay, Latouche Island, Alaska: U.S. Geological Survey Bulletin 1024-E, p. 107-122.
|Reporters||Jeff A. Huber and Carol S. Huber (Anchorage)|
|Last report date||12/18/2001|