Location: This well known prospect is along the shoreline about 0.2 mile northwest of triangulation station 'San Antonio.' It is about 0.9 mile north-northeast of Thimble Cove and about 0.4 mile south-southeast of the northwest corner of section 33, T. 75 S., R. 78 E.

Geology: This deposit is exposed for about 600 feet just above the shoreline (Roehm, 1936 [PE 119-3]; Smith, 1942 [B 926-C]; Twenhofel and others, 1946). Silurian or Ordovician argillite and quartzite of the Descon Formation are intruded by a Cretaceous granodiorite pluton (Eberlein and others, 1983; Brew, 1996). The contact is marked by several hundred, generally parallel, quartz veins and veinlets 1 to 3 inches thick in the granodiorite. Molybdenite, arsenopyrite, pyrite, and pyrrhotite occur in the veins, along vein selvages, and along fractures in the granodiorite. The granite is silicified. The property was originally staked from 1927 to 1930 and four holes were drilled in 1932 (Roehm, 1936 [PE 119-3]). Smith (1942 [B 926-C]), citing an unpublished report on the 1932 drilling, estimated that the deposit contains about 100,000 tons of mineralized rock that averages 0.276 percent molybdenum. The property was drilled again in 1943, and Twenhofel and others (1946) estimated that the deposit contains less than 0.05 percent molybdenum. Several descriptions of the deposit mention high gold values and Roehm (1936 [PE 119-3]) states that core samples from the holes drilled in 1932 contained an average of $3.20 in gold per ton (at $20.67 per ounce?).

Workings: The deposit is well exposed just above the shoreline and 4 holes were diamond drilled in 1932. There was additional diamond drilling in 1943.

Age: Deposit is probably related to emplacement of the granodiorite host rock.

Alteration: Granodiorite host rock is silicified.

Reserves: Smith (1942 [B 926-C]), citing an unpublished report on the 1932 drilling, estimated that the deposit contains about 100,000 tons of mineralized rock that averages 0.276 percent molybdenum. The property was drilled again in 1943, and Twenhofel and others (1946) estimated that the deposit contains less than 0.05 percent molybdenum. Several descriptions of the deposit mention high gold values, and Roehm (1936 [PE 119-3]) states that core samples from the holes drilled in 1932 contained an average of $3.20 in gold per ton (at $20.67 per ounce?).

Commodities (Major) - Au, Mo; (Minor) - As

Development Status: None

Deposit Model: Gold and molybdenum in quartz veinlets in the periphery of a granodiorite pluton

Other Databases

Link to USGS - Alaska:	CR092

Other Regions, Features and Areas containing this locality

References