Old No. 2 Prospect, Fairbanks Mining District, Fairbanks North Star Borough, Alaska, USAi

Regional Level Types
Old No. 2 Prospect	Prospect
Fairbanks Mining District	Mining District
Fairbanks North Star Borough	Borough
Alaska	State
USA	Country

Location: This prospect is on the south side of Old Murphy Dome Road; it is across the road from the western gate to the road down to the Scrafford mine (FB077) in the NE1/4 sec. 21, T. 2 N., R. 1 W., Fairbanks Meridian.
Geology: The following geologic description is summarized from a report by Sam Dashevsky (1993) on work done by American Copper and Nickel Company on the Eagle Creek property in the early 1990's. In 1964, a high-grade antimony shear zone, the No. 2 vein, was discovered by Silver Ridge Mining Co. The shear was explored by minor trenching and a 35-foot shaft. In 1976, high gold values were recognized at the prospect. The prospect is within sub-horizontal, quartz-mica and graphitic phyllitic schists that are cut by a 4.5-foot-wide zone filled with gouge. The fault zone is exposed in one of several sloughed trenches that trend east-northeast across the ridge along Old Murphy Dome road. The fault zone is exposed for 160 feet along strike in trenches; it is 3.5 to 9.5 feet thick and extends beyond the trenches for an unknown distance. Twenty-five feet of schist in the footwall contains 220 to 750 ppb gold and averages 0.01 ouncesof gold per ton. A 4.5-foot-wide fault zone at the southeast end of the trench averages 11,300 ppb gold (0.33 ounce of gold per ton) and 1 to 3 percent antimony. A reverse circulation drill hole intercepted a weakly mineralized zone, 5 feet long of quartz, limonitic schists, and abundant gouge that contained 130 ppb gold, 722 ppm arsenic, and 1,334 ppm anitmony. Limonitic footwall schist persists for 85 feet,and is truncated by a shear zone that runs 0.06 ouncesof gold per ton over 5 feet.
Workings: In 1964, a high-grade antimony shear zone, the No. 2 vein, was discovered by Silver Ridge Mining Co. while clearing a turnout beside the road. Minor trenching took place, and a 35-foot shaft was sunk. The original trenches were periodically cleaned out and resampled by later operators. In 1991, additional prospecting was conducted by American Copper and Nickel Company and one hole was drilled.
Alteration: Pervasive iron-staining is found in the footwall schist. Clay-sericite alteration and fault gouge are developed in the shear zone (Dashevsky, 1993).

Commodities (Major) - Au, Sb
Development Status: Undetermined
Deposit Model: Gold-antimony shear zone in quartz-mica and graphitic, phyllitic schists.

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Link to USGS - Alaska:	FB079

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References