Unnamed Prospect (ARDF - EA092; near VABM Good), Goodpaster Mining District, Southeast Fairbanks Census Area, Alaska, USAi

Regional Level Types
Unnamed Prospect (ARDF - EA092; near VABM Good)	- not defined -
Goodpaster Mining District	Mining District
Southeast Fairbanks Census Area	Census Area
Alaska	State
USA	Country

The VABM Good prospect is located within Doyon, Ltd. selected or conveyed land. For more information contact Doyon, Ltd., Fairbanks, Alaska.
Location: This prospect covers the southern and western peaks near VABM Good; it is about 2 miles west of Mount Harper in the headwaters of the Healy River. The coordinates are the approximate center of the prospect, in section 11, T. 8 S., R. 19 E., of the Fairbanks Meridian; the location is accurate. The Mount Harper area is locality 6 of Cobb (1973 [MF-393]). This prospect is located within Doyon, Ltd. selected or conveyed land.
Geology: Biotite granodiorite of the Mount Harper intrusive complex comprises the peak around VABM Good (U.S. Bureau of Mines, 1995). Biotite from the Mount Harper granite gives a 40Ar/39Ar plateau age of 105.8 +/- 0.4 Ma (Newberry and others, 1996). An abrupt 90-gamma magnetic high over the southern summit of VABM Good coincides with an area of molybdenum-tungsten-bismuth enrichment in quartz veins (Dashevsky and others, 1986). Quartz-vein density is as high as 25 veins per square foot 500 feet west of VABM Good. About 800 feet southeast of the summit, abundant vuggy-quartz float contains malachite, brochantite, chrysocolla, chalcopyrite, and cuprite and minor scheelite, powellite, and molybdenite. Geochemical sampling suggests a molybdenum-tungsten stockwork system centered about 1,000 feet southwest of VABM Good. The magnetic anomaly in the area suggests an underlying skarn that extends to the Larsen Ridge skarn prospect (EA091) to the northeast. Several other molybdenum-tungsten prospects are in the Mount Harper area, including Airplane Ridge (EA093), Quartz-Porphyry (EA094), and Section 21 (EA095). Molybdenite in a quartz vein on the southern slope of Mount Harper was first reported by Chapin (1919). Anomalous tungsten, copper, and molybdenum values were found during a stream-sediment reconnaissance in the Mount Harper area by WGM Inc. in 1975; this was followed by geologic mapping and rock sampling in 1976 (Dashevsky and others, 1986). An airborne magnetic survey in 1979 by Union Carbide Corp. discovered the magnetic anomaly near the summit of VABM Good; this was followed by geologic mapping, rock sampling, and ground magnetics in 1980. In 1981, a drill hole by Union Carbide Corp. was abandoned at 623 feet due to adverse ground conditions; no significant mineralized intercepts were penetrated.
Workings: Molybdenite in a quartz vein on the southern slope of Mount Harper was first reported by Chapin (1919). Anomalous tungsten, copper, and molybdenum values were found during a stream-sediment reconnaissance in the Mount Harper area by WGM Inc. in 1975; this was followed by geologic mapping and rock sampling in 1976 (Dashevsky and others, 1986). An airborne magnetic survey in 1979 by Union Carbide Corp. discovered the magnetic anomaly near the summit of VABM Good; this was followed by geologic mapping, rock sampling, and ground magnetics in 1980. In 1981, a drill hole by Union Carbide Corp. was abandoned at 623 feet due to adverse ground conditions; no significant mineralized intercepts were penetrated.
Age: Cretaceous or younger.

Commodities (Major) - Cu, Mo, W; (Minor) - Ag, Au, Bi
Development Status: None
Deposit Model: W skarn or porphyry Mo (Cox and Singer, 1986; models 14a and 21b).

Other Databases

Link to USGS - Alaska:	EA092

Other Regions, Features and Areas containing this locality

References