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No Name Prospect, Chicagof District, Sitka Borough, Alaska, USA

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Location: The No Name prospect is shown by symbol on the 1:63,360-scale topographic map. It is 1.3 miles southeast of Arguello Island at the head of Silver Bay and about 0.3 mile northwest of the center of section 32, T. 56 S., R. 65 E. The underground workings were mapped by Bittenbender and others (1999, fig. 25).
Geology: This deposit is one of many of similar deposits (PA002 to PA018) scattered over an area of about 6 square miles at the head of Silver Bay (Bittenbender and others, 1999). The deposits are gold-quartz veins with sparse sulfides, usually only pyrite and arsenopyrite. Samples that have been analyzed with modern methods usually show anomalous arsenic even if arsenopyrite is not identified in the rocks, and several parts per million mercury. The veins are often parallel to the bedding of the host rock which is graywacke and argillite of the Sitka Graywacke of Cretaceous age (Loney and others, 1975). Many of the so-called veins in the early literature are actually fault zones with lenses of quartz or concentrations of quartz stringers along the fault zone. Prospecting began in the area in 1871. The Stewart Mine (PA012) was located in 1872 and it was the first lode-gold mine in Alaska. The Silver Bay area has been prospected intermittently to the present but the veins are relatively small and most are low grade. The area has produced relatively little gold, many of the properties have not been active since before 1900, and there has been no production since the early 1940's. Bittenbender and others (1999) located this prospect which apparently had not been described previously. A 230-foot adit with a 24-foot drift were driven in graywacke and argillite. The drift at the end of the adit is along a brecciated fault zone with quartz stringers at a graywacke-greenstone contact. Samples from the adit contained very low gold values; the highest gold value was 60 parts per billion across 3.5 feet. All of the samples contained anomalous arsenic and several contained anomalous mercury. The highest arsenic value was 632 parts per million (ppm) and two samples contained 1.6 and 2.9 ppm mercury.
Workings: The only workings are a 230-foot adit with a 24-foot drift.
Age: Cretaceous or younger based on the age of the host rock.
Production: Probably none.
Reserves: None.

Commodities (Major) - Au; (Minor) - As, Hg
Development Status: Undetermined.
Deposit Model: Low-sulfide, gold-quartz vein (Cox and Singer, 1986; model 36a).

Mineral List



1 entry listed. 1 valid mineral.

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References

Bittenbender, P., Still, J.C., Maas, K., and McDonald, M., Jr., 1999, Mineral resources of the Chichagof and Baranof Islands area, southeast Alaska: Bureau of Land Management, BLM-Alaska Technical Report 19, 222 p. Loney, R.A., Brew, D.A., Muffler, L.J. B., and Pomeroy, J.S., 1975, Reconnaissance geology of Chichagof, Baranof, and Kruzof Islands, southeastern Alaska: U.S. Geological Survey Professional Paper 792, 105 p.

 
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