Emma; Overgard; Kathrine Mine, Fairbanks Mining District, Fairbanks North Star Borough, Alaska, USAi

Regional Level Types
Emma; Overgard; Kathrine Mine	Mine
Fairbanks Mining District	Mining District
Fairbanks North Star Borough	Borough
Alaska	State
USA	Country

Location: Cobb (1972, MF-413), loc. 35; NE1/4 sec. 36, T. 3 N., R 1 E., of the Fairbanks Meridian. This mine is on the east side of Willow Creek, near its head, at an elevation of 2,100 feet; it is about 1/4 mile northwest of Cleary Summit along the Steese Highway. Accuracy is within 1,000 feet.
Geology: By 1909, a 40 foot shaft had been sunk on the prospect and a northeast striking, steeply southeast dipping quartz-bearing shear zone was exposed. The higher grade portion of the shear was 2 to 16 inches wide and contained gold, stibnite, arsenopyrite, pyrite and minor sphalerite (Prindle, 1910). The schist host rock is strongly brecciated and cemented by quartz. By 1912, the shaft had been sunk to a depth of 60 feet with short drifts at the 60-foot level (Smith, 1913; B 525). The shear is hosted in part by mafic metavolcanic rocks and exhibits considerable offset by faulting. The shear dips steeply to the south at the surface but flattens to 45 degrees at depth. Ten tons of ore from this prospect were milled in Fairbanks and contained $38 per ton in gold (1.8 ounces of gold per ton). Chapin (1914) reported that in 1913 the drifts at the 60-foot level were 30 feet and 70 feet long to the east and west, respectively. An adit was being driven from the Willow Creek basin to allow exploration and development to proceed. A minor amount of exploration was completed on the prospect in 1914 (Eakin, 1915). A small amount of production was recorded from the prospect in 1917 however no tonnage or grade information is available (Martin, 1919). The prospect was idle until 1924 when it was re-opened, however, it was abandoned shortly afterwards and was idle when visited in 1931 (Hill, 1933).
Workings: By 1910, the vein was exposed by a 40 foot shaft (Prindle, 1910). Chapin (1914) reported a 60 foot inclined shaft and 100 feet of drifts.
Production: Ten tons of ore from this prospect were milled in Fairbanks and contained $38 per ton in gold (1.8 ounces of gold per ton) (Smith, 1913; B 525). A small amount of production was recorded from the prospect in 1917 however no tonnage or grade information is available (Martin, 1919).

Commodities (Major) - Au; (Minor) - Sb, Zn
Development Status: Yes; small
Deposit Model: Polymetallic vein (Cox and Singer, 1986; model 22c).

Other Databases

Link to USGS - Alaska:	LG093

Other Regions, Features and Areas containing this locality

References