|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 occurrence is located 1 mile east of Horseshoe Bay on Latouche Island, at an elevation of about 500 feet. It is in the NE1/4 section 17, T. 2 S., R. 9 E., of the Seward Meridian. This is location 260 of Tysdal (1978 [MF-880-A]) and location S-2 of Jansons and others (1984). This location is accurate to within a quarter of a mile.|
Geologic descriptionBedrock in the area consists of northeast-striking, west-dipping interbedded shale and graywacke of the Orca Group of early Tertiary age (Kurtak and Jeske, 1986). The occurrence is along the northwest limb of a shallowly northeast-plunging antiform (Stejer, 1956). The sulfide occurrences in the vicinity of Horseshoe Bay consist of tabular lenses of massive and disseminated sulfides that conform to the stratification of the enclosing bedrock (Stejer, 1956). The ore mineralogy is fairly simple, consisting of pyrite, chalcopyrite, cubanite, sphalerite, and pyrrhotite; gangue minerals consist of quartz, calcite, and epidote (Stejer, 1956). Assay results indicate that small amounts of gold and silver are also present (Stejer, 1956).
|Geologic map unit||(-147.936315556382, 60.0059447201576)|
|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 asymmetric sericite-chlorite alteration associated with the massive sulfide mineralization (Rogers and Hoyt, 1999).|
|Workings or exploration||Grant and Higgins (1909) showed the occurrence as a map location, but no description was given. There are no reported assays or workings.|
|Indication of production||None|
Additional commentsThere are two prospects owned by Chugach Alaska Corporation with the same name as this occurrence; one is located near Landlocked Bay in the Valdez quadrangle, and the other is located near Humpy Cove in the Blying Sound quadrangle.
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.
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.
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.
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.
|Reporters||Jeff A. Huber and Carol S. Huber (Anchorage)|
|Last report date||9/21/2001|