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Mensim; Little Green; Green Tree Prospect, Valdez Creek District, Matanuska-Susitna Borough, Alaska, USA

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Location: This prospect is on the divide between Clearwater Creek and the West Fork Maclaren River at an elevation of about 5,000 feet. The prospect is approximately at the midpoint of the boundary between sections 19 and 20, T. 19 S., R. 5 E., Fairbanks Meridian. It corresponds to locality A29 of Kurtak and others (1992), approximately to the Green Tree claim (Heiner and Porter, 1972; Kardex site number KX68-85), and the Mensim and Little Green claims. The location is approximate, in the SW1/4 section 20, T. 19 S., R. 5 E., Fairbanks Meridian. The MAS/MILS number is 002680034.
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

Mineral List

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.

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