Unnamed (on Alder Creek)

Prospect, Probably inactive

Commodities and mineralogy

Main commodities Au
Ore minerals gold
Gangue minerals pyrite; quartz; talcose altered material

Geographic location

Quadrangle map, 1:250,000-scale TE
Quadrangle map, 1:63,360-scale A-3
Latitude 65.063
Longitude -166.19
Nearby scientific data Find additional scientific data near this location
Location and accuracy Alder Creek is an east tributary to Gold Run who's mouth is 1.9 miles upstream of the confluence of Gold Run and Bluestone River. This lode prospect is located on the south side of the creek, at approximately 320 feet surface elevation, 1,000 feet southeast of the confluence with Gold Run. This prospect is just southeast of the facilities of Sullivan's Camp and it is shown as a prospect occurrence on the USGS 1:63,360 topographic map of the Teller A-3 quadrangle. It is locality 21 of Cobb and Sainsbury (1972). Cobb (1975) summarized relevant references under the name 'Alder Cr.'.

Geologic setting

Geologic description

This is a lode prospect initially exposed on lower Alder Creek by placer operations and subsequently explored to a depth of 60 feet from exposures on the south side of the creek. The prospect is an altered fault (?) zone, in one place 16 feet wide, along a contact between schistose carbonate rocks in the hanging wall and metapelitic rocks in the footwall (Collier and others, 1908, p. 279-280). The altered zone is a talcose material with quartz stringers and blebs, pyrite, and fine gold. A sample assayed 0.06 opt gold and a trace of silver (Collier and others, 1908).
Geologic map unit (-166.192654560157, 65.0622300965192)
Mineral deposit model Altered fault? contact with quartz stringers, pyrite, and fine gold. Possibly low sulfide Au-quartz vein model? (Cox and Singer, 1986, model 36a?).
Mineral deposit model number 36a?
Age of mineralization Not known; apparently postdates regional deformation and metamorphism which is Late Jurassic/Early Cretaceous in age.
Alteration of deposit Clay and sericite? may be source of talcose material noted by Collier and others (1908).

Production and reserves

Workings or exploration Some surface workings and shallow exploration to depth of 60 feet has been noted.
Indication of production None
Reserve estimates Not defined

References