Colbert and Warmbold

Occurrence, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals gold

Geographic location

Quadrangle map, 1:250,000-scale LG
Quadrangle map, 1:63,360-scale A-1
Latitude 65.056
Longitude -147.411
Nearby scientific data Find additional scientific data near this location
Location and accuracy Cobb (1972, MF-413), loc. 42; SE1/4 sec. 30, T. 3 N., R. 2 E., of the Fairbanks Meridian. This occurrence is near the head of Tamarack Creek, about 1 mile northeast of Cleary Summit. Accuracy is within 3,000 feet.

Geologic setting

Geologic description

This occurrence consists of small gold-bearing quartz veins in schist; the veins strike N 50 W and dip 28 S (Chapman and Foster, 1969). In October, 1932, an adit was driven to intersect three quartz-bearing shear zones previously found on the surface. In early February, 1933, the adit had been driven a distance of 550 feet (Pilgrim, 1933). At the 175 foot station of the adit, a one-inch-thick quartz veinlet was intersected. This stringer zone strikes N 48 W and dips 53 SW and carried a small amount of free gold. The adit intersects a second mineralized zone at the 240 foot station. This shear zone consists of barren brecciated schist and gouge. At the 380 foot station, the adit intersected a shear zone trending N 60 W and dipping 28 SW (Pilgrim, 1933; Stewart, 1933). This shear zone dips 45 SW at the surface. The shear contains a 5-inch-thick crushed quartz stockwork zone containing abundant free gold. The zone was iron-oxide stained and contained no visible sulfides.
Geologic map unit (-147.413446951073, 65.0555770048221)
Mineral deposit model Gold-quartz vein.
Alteration of deposit Iron oxide stains.

Production and reserves

Workings or exploration In October, 1932, an adit was driven to intersect three quartz-bearing shear zones previously found on the surface. In early February, 1933 the adit had been driven a distance of 550 feet (Pilgrim, 1933). Mineralized zones were encountered at the 175 foot, 240 foot, and 380 foot stations (Pilgrim, 1933).
Indication of production Undetermined

References