14-3-020: gabbro - Stillwater District - Stillwater Mine

Details

Specimen Number14-3-020Alternate NumberSW-16CommentsSample collected by Daven Mashburn. Three samples in this suite comprise a Troctolite PGE interval: samples 14-3-020, 14-3-016, and 14-3-005. Estimated grades run 14.7 g/t Pt+Pd (Pt:Pd = 3.5) and 0.15% Cu+Ni over a strike length of 657 m, and a true thickness of 1.9 m. High grade runs to 22.3 g/t Pt+Pd for 5.5 km with a true thickness of 2.1m. Chromite is also common in this interval. This interval overlies the Mixed Zone. Olivine is typically serpentinized, the bronzite is typically coarse-grained and contains bronzite and olivine inclusions that are not optically continuous with the large host crystal.In Teaching CollectionNoMineral(s)bronziteolivineplagioclaseRock NamegabbroDistrictStillwaterMineStillwaterExternal LinkMindatGeo-LocationundefinedSub-LocationundefinedDeposit TypeLayered mafic intrusionGeo-Coords^[1]Reference MaterialACL-171: Gold, D.P., and Mueller, P., eds., 1979, Field Trip Guide to the Stillwater Layered Intrusive Complex, Montana; U.S. Nat'l. Comm. Arch. Geochem., 1979 Ann. Field Conf., Y.B.R.A. Camp, Red Lodge, Montana, August 12-18, 1979, 39 p.

ACL-172: Page, N.J., and Nokleberg, W.J., 1974, Geologic Map of the Stillwater Complex, Montana; Misc. Invest. Ser. Map I-797, Reston, VA.

ACL-225: Howland, A.L., 1955, Chromite Deposits in Central Part Stillwater Complex, Sweet Grass County, Montana; U.S. Geol. Surv. Bull. 1015-D, Washington, D.C., 26 p.

ACL-230: Mertie, J.B., 1969, Economic Geology of the Platinum Metals; U.S. Geol. Surv. Bull. 630, Washington, D.C., 120 p.

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14-3-020: gabbro - Stillwater District - Stillwater Mine

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14-3-020: gabbro - Stillwater District - Stillwater Mine