Big Blue

Prospect, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals gold

Geographic location

Quadrangle map, 1:250,000-scale FB
Quadrangle map, 1:63,360-scale D-3
Latitude 64.875
Longitude -148.008
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Big Blue prospect is located west of Henderson Road, just west of the Prometheus shaft (FB041), at an elevation of approximately 1,550 feet (Hill, 1933, p. 148). It is about 1.3 miles east-southeast of the top of Ester Dome, in the NW1/4 sec. 32, T. 1 N., R. 2 W., Fairbanks Meridian.

Geologic setting

Geologic description

Material on the dump suggests the ore zone consisted of a fault zone of crushed schist, quartz, and gouge (Hill, 1933, p. 148). The vein strikes N. 27 E., but a dip could not be determined at the time of Hill's visit in 1931, due to the collapse of the prospect pits. The bedrock is mainly biotite schist; many pieces of quart-mica schist are on several of the dumps. The Big Blue prospect is in a unit of quartz-muscovite schist, quartzite, and chlorite-quartz schist of the Fairbanks Schist as mapped by Newberry and others (1996).
Geologic map unit (-148.01043034357, 64.874563651507)
Mineral deposit model Schist-hosted gold-quartz vein

Production and reserves

Workings or exploration In 1931, the Big Blue lead consisted of a number of shallow shafts and pits (Hill, 1933, p. 148).
Indication of production Undetermined