Shepard Occurrence, McGrath District, Yukon-Koyukuk Borough, Alaska, USA
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Location: The Shepard occurrence is situated on a north-facing spur of a sharp 3,160 foot high peak that overlooks Shepard Creek. The occurrence is at an elevation of 3,080 feet (939 m) in Section 9, T. 22 S., R. 24 E., of the Kateel River Meridian. The site is accurate to within 500 feet (152 m).
Geology: The Shepard occurrence consists of quartz veins in and near a northwest trending quartz monzonite dike swarm (DiMarchi and others, 1992). The quartz veins contain disseminated arsenopyrite, chalcopyrite, and carry gold values; they are found in zones of silicic and phyllic alteration in the quartz monzonite dikes. Surface samples collected by DiMarchi and others (1992) contain up to 500 ppb gold. Nine samples averaged 100 ppb gold. Copper, cobalt, and arsenic values are not given.
Workings: Surface samples taken by DiMarchi and others (1992) contain up to 500 ppb gold. Nine samples averaged 100 ppb gold. Copper, cobalt, and arsenic values are not given.
Alteration: Silicic and phyllic in intrusion.
Commodities (Major) - Au, Cu, Zn; (Minor) - Co
Development Status: No
Deposit Model: Polymetallic veins (Cox and Singer, 1986; model no. 22c)
3 entries listed. 3 valid minerals.
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DiMarchi, J.J., Weglarz, T.B., Freeman, L.K., Nicholson, L.C., and Barker, J.C., 1992, Annual Report for 1992--Doyon Option Lands, Block 10: ASA Inc. Report, 121 p. (Report held by Doyon, Limited, Fairbanks, Alaska.)