Mine, 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-2
Latitude 64.872
Longitude -148
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Killarney mine is located in the SE1/4 NW1/4 sec. 32, T. 1 N., R. 2 W., Fairbanks Meridian. This mine is at the head of Saint Patrick Creek at an elevation of about 1,340 feet; it is about 1.8 miles east-southeast of the top of Ester Dome. The mine is included in locality 14 of Cobb (1972 [MF 410]).

Geologic setting

Geologic description

About 180 tons of gold was produced from the Killarney mine, which consists of fractured and re-cemented gold-bearing quartz veins in micaceous schist (Chapman and Foster, 1969, p. D18; Stewart, 1933, p. 140-141). The veins are oriented N. 5 E., 75 W. and are intersected at intervals by faults that trend at a shallow angle to the strike and dip of the veins (Stewart, 1933, p. 141). Two types of quartz were observed in the vein (Stewart, 1933, p. 141). One type is low-grade ore, has a sugary texture, and is unfractured. The other is somewhat translucent, grayish quartz that has been fractured into segments from one-quarter inch to one-half inch in length that were was subsequently recemented. In the second type of quartz, free gold is visible in particles as large as a pinhead. Workings consisted of a 94-foot shaft with three drifts (Stewart, 1933, p. 140-141).
Geologic map unit (-148.002429898538, 64.8715638265536)
Mineral deposit model Schist-hosted gold-quartz vein
Alteration of deposit The vein quartz is oxidized and iron-stained (Stewart, 1933, p. 141).

Production and reserves

Workings or exploration In January of 1932, a vertical shaft was started that eventually reached a depth of 94 feet by 1933 (Stewart, 1933, p. 140). At the 90-foot level, drifts were extended both north and south along the vein. The north drift was driven a distance of about 60 feet from the shaft where it encountered a fault. The south drift was driven for about 165 feet from the shaft. Another drift at the 30-foot level was driven northward toward the fault (Stewart, 1933, p. 140-141).
Indication of production Yes; small
Production notes About 180 tons of ore was mined from the Killarney workings during 1932; the ore was processed at the Saint (St.) Paul mill (Stewart, 1933, p. 141).