Ptarmigan Creek

Prospect, Probably inactive

Commodities and mineralogy

Main commodities Au
Ore minerals gold; platinum group element (pge) minerals

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale A-2
Latitude 63.1157
Longitude -144.6781
Nearby scientific data Find additional scientific data near this location
Location and accuracy Ptarmigan Creek flows east into lower Limestone Creek, which is a main tributary of the Middle Fork Chistochina River. The prospect is on Ptarmigan Creek at an elevation of about 4,000 feet, in the NE1/4NE1/4 section 9, T. 21 S., R. 16 E., Fairbanks Meridian. The location of the prospect is approximate; it is assumed to be where a prospect trail (ditch?) from upper Limestone Creek crosses Ptarmigan Creek (see the Mount Hayes A-2 quadrangle topographic map). (MH003 in the D-6 quadrangle is also named Ptarmigan Creek.)

Geologic setting

Geologic description

Ptarmigan Creek was one of the properties of Middle Fork Mining Company of Seattle (Moffit, 1944) and was staked in a group of about 75 mining claims that covered parts of an auriferous bench at least 3 miles long.
Ptarmigan Creek is about 3 miles long. The upper 2 miles of the creek are in a canyon incised in bedrock; the lower mile flows on a gravel bench on the west side of the Middle Fork Chistochina River. The bench is auriferous, and where prospected on Limestone (MH309), Bedrock (MH310), and Kraemer (MH311) Creeks, gravels were generally less than 40 feet thick (Moffit, 1944; Cobb, 1979 [OFR 79-238]). Results of prospecting on Ptarmigan Creek are unknown. Claims were staked in 1907 on Ptarmigan Creek for gold and platinum (Heiner and Porter, 1972).
Geologic map unit (-144.6803286656, 63.115305416074)
Mineral deposit model Placer Au-PGE (Cox and Singer, 1986; model 39a).
Mineral deposit model number 39a
Age of mineralization Pleistocene to Holocene.

Production and reserves

Workings or exploration More than 70 claims were staked on the Ptarmigan Creek bench for gold and platinum in 1907 (Heiner and Porter, 1972, Kardex site number KX68-26). Workings are unknown, but the bench dissected by Ptarmigan Creek was probably prospected with reconnaissance pits or drill holes. Claims on Ptarmigan Creek were part of the property of the Middle Fork Mining Company of Seattle in 1941 (Moffit, 1944).
Indication of production Undetermined
Reserve estimates A low-grade gold resource is present on the bench of the Middle Fork Chistochina River bisected by Ptarmigan Creek (Moffit, 1944).