Unnamed (near Peterson Creek)

Prospect, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Cu; Pb
Ore minerals chalcopyrite; galena; gold; pyrite
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale D-6
Latitude 60.8966
Longitude -149.0402
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is reported to be on the northeast side of Peterson Creek at an elevation of 1,100 feet about one-half mile from the Seward Highway. The map site is in the SE1/4 section 2, T. 9 N., R. 2 E., of the Seward Meridian. This is location 3 of Cobb and Richter (1972), location 3 of MacKevett and Holloway (1977), location 3 of Cobb and Tysdal (1980), and location S-318 of Jansons and others (1984). The location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

Capps (1916) described the country rock near the prospect as a massive series of greenstones and greenstone tuffs, with small amounts of interbedded shales. The greenstones are generally a fine-grained dense green rock enclosing abundant angular slate fragments. Nelson and others (1985) mapped the bedrock in this area as undivided sedimentary strata of the Valdez Group of Late Cretaceous age.
The deposit consists of a 2-inch-wide quartz-calcite vein that strikes N60W and dips 75SW. The vein contains pyrite, galena, and chalcopyrite along with $12.60 in gold (at $20.67 per ounce) per ton. It is exposed on the northeast side of Peterson Creek at an elevation of 1,100 feet, where a 37-foot-long drift is driven on it. There are numerous other adits and drifts on the prospect, but there are few details on the geology and mineralization. Assay results from these adits ranged to as much as $38.00 in gold ($20.67 per ounce) per ton (Capps, 1916).
Geologic map unit (-149.042366606155, 60.8960250477987)
Mineral deposit model Low-sulfide Au-quartz vein (Cox and Singer, 1986; model 36a)
Mineral deposit model number 36a
Age of mineralization Cretaceous or younger; the vein cuts rocks of the Valdez Group of Late Cretaceous age.

Production and reserves

Workings or exploration
A 37-foot-long drift at an elevation of 1,100 feet follows a 2-inch-wide quartz-calcite vein. Other adits and drifts are reported near 3,600 feet elevation. Assay values from $12.60 to $38.00 per ton of gold (at $20.67 per ounce) are reported (Capps, 1916).
The U.S. Bureau of Mines visited the area in 1980 but did locate any workings or collect any samples (Hoekzema and Sherman, 1983).
Indication of production Undetermined

Additional comments

Claims were staked in 1980 on the prospect. The U.S. Bureau of Mines described the deposit as a 3-foot-wide quartz vein (Jansons and others, 1984). They did not locate significant mineralization. Their description of the deposit differs considerably from that of Capps (1916).

References

References

Hoekzema, R.P., and Sherman, G.E., 1983, Mineral investigations in the Chugach National Forest, Alaska (Peninsula study area): U.S. Bureau of Mines in-house report; held at U.S. Bureau of Land Management Alaska State Office, Anchorage, 524 p.
Reporters Jeff A. Huber (Anchorage)
Last report date 4/8/2000