Mensim; Little Green; Green Tree Prospect, Valdez Creek District, Matanuska-Susitna Borough, Alaska, USA
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Geology: The rocks near this prospect are argillite of probable Cretaceous age and are cut by quartz veins and granitic dikes. The rocks are iron-stained and contain disseminated pyrite, possibly chalcopyrite, and magnetite. The property was first located in 1964 for copper, gold, iron, and silver (Heiner and Porter, 1972; Kardex site number KX68-85). The U.S. Bureau of Mines (Kurtak and others, 1992) probably occupied and sampled this site in a search for molybdenite-bearing veins. Kurtak and others (1992) reported disseminated pyrite and arsenopyrite in felsic dike rocks at the property. Some of the dikes and veins contain small amounts of gold; a felsic dike with disseminated pyrite (sample 949) contained 125 parts per billion (ppb) gold, and a quartz-carbonate vein (sample 602) contained 395 ppb gold. A quartz vein in rubble (sample 605) contained 0.98 ounce of silver per ton and 282 parts per million lead.
Workings: No reported workings. The area was sampled in reconnaissance by the U.S. Bureau of Mines (Kurtak and others, 1992).
Age: Probably Late Cretaceous or younger. Veins and dikes cut argillite of probable Cretaceous age.
Commodities (Major) - Cu; (Minor) - Au, Ag, Fe
Development Status: None
5 entries listed. 5 valid minerals.
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Heiner, L.E., and Porter, Eve, 1972, Alaska Mineral Properties, volume 2: University of Alaska, Mineral Industry Research Laboratory Report 24, 669 p. Kurtak, J.M., Southworth, D.D., Balen, M.D., and Clautice, K.H., 1992, Mineral investigations in the Valdez Creek mining district, south-central Alaska: U.S. Bureau of Mines Open-File Report 1-92, 659 p., 2 plates, scale 1:250,000.