Nars Anderson; Dorando Prospect, Fairbanks Mining District, Fairbanks North Star Borough, Alaska, USAi

Regional Level Types
Nars Anderson; Dorando Prospect	Prospect
Fairbanks Mining District	Mining District
Fairbanks North Star Borough	Borough
Alaska	State
USA	Country

Location: The Nars Anderson prospect is located approximately one mile northwest of the Hi Yu mine (ARDF no. LG182) along the access road on the ridge between the heads of Moose Creek and Too Much Gold Creek; NW1/4NE1/4 sec. 22, T. 3 N., R. 2 E., of the Fairbanks Meridian.
Geology: Smith (1913, B 525) reported a shear zone with quartz-rich intervals from 6 inches to 2 feet wide, although mineralization in the surrounding wall rocks made an ore zone up to 6 feet wide. The hanging wall of the shear is highly faulted and slickensided with post-mineral motion visible. The foot wall contains mixed wall rock and quartz and the contact is not faulted above the 80-foot station in the shaft. Below the 80-foot station both the hanging wall and foot wall appear to be fault contacts (Smith, 1913; B 525). By 1912, the shear zone hosting the gold was traced for over 1,700 feet along its east-west strike and the high grade portion of the shear was 8 to 18 inches wide and dipped 65 N (Times Publishing Company, 1912). In the fall of 1911, a one ton sample of ore from this zone was custom milled and averaged $60 per ton in gold (2.9 ounces of gold per ton). An additional 1.5 tons of material was custom milled in 1911 and 4 tons of material were custom milled in the spring of 1912 (Smith, 1913; B 525). The grade of these two lots is unknown. By 1922, the Hi Yu shear zone (ARDF no. LG182) had been traced to the northwest and identified as the same shear zone as the Nars Anderson (Davis, 1922).
Workings: The Nars claim was staked on September 14, 1911 by Otto Nars (Times Publishing Company, 1912). By October, 1912, a shaft had been sunk to depth of 105 feet with working drifts on the 60- and 100-foot levels. On the 60-foot level drifts extended 50 feet to the west and 25 feet to the east. At the 100-foot level, a drift extended 10 feet on each side of the shaft. Bad air in the shaft curtailed operations in 1912 until artificial ventilation could be provided. At that time about 2.5 tons of material was sacked and stockpiled at the mine site awaiting custom milling. A small boiler and steam hoist had been erected over the shaft and work continued through the winter of 1912. In 1915, the workings on the prospect consisted of a 100-foot adit and a 100-foot deep shaft with working levels at 60 and 100 feet (Brooks, 1916; B 642). By 1922, the drifts on the 60-foot level were 50 and 60 feet long (Davis, 1922). Production to 1922 was estimated at 200 tons of ore and subsequent mining of the Nars Anderson prospect was expected to be conducted through the upper adit at the Hi Yu mine. In 1985, Placid Oil Company drilled two diamond drill holes on the Nars Anderson prospect. Placid Oil Company records refer to this prospect as the Dorando prospect and mistakenly refer to the Rob Roy prospect as the Nars Anderson prospect. Holes 1DD-85 and 2DD-85 were drilled to the south at inclinations of 70 and 85 degrees to a total depth of 179 and 185 feet, respectively (Porterfield and Croff, 1986). No significant mineralization was encountered and no additional work has been conducted on this prospect.
Production: Production to 1922 was estimated at 200 tons of ore; subsequent mining of the Nars Anderson prospect was expected to be conducted through the upper adit at the Hi Yu mine (Davis, 1922).

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

Other Databases

Link to USGS - Alaska:	LG174

Other Regions, Features and Areas containing this locality

References