McCann Creek

Occurrence, Active?

Commodities and mineralogy

Main commodities PGE
Ore minerals chromite; ilmenite; magnetite; platinum-group metal alloys

Geographic location

Quadrangle map, 1:250,000-scale HG
Quadrangle map, 1:63,360-scale D-6
Latitude 58.98
Longitude -161.71
Nearby scientific data Find additional scientific data near this location
Location and accuracy McCann Creek is a small stream that flows north from the northern end of Red Mountain to Smalls River. The Platinum to Goodnews Bay Mining Camp road crosses McCann Creek at its confluence with Smalls River, which is 2 miles northeast of the summit of Red Mountain. The map site is at an elevation of about 200 feet on McCann Creek. This occurrence is included in locality 8 of Cobb (1972 [MF 362]; 1980 [OF 80-909]).

Geologic setting

Geologic description

Platinum-group metals have been identified in this creek but no workable pay streak has been found. PGM-rich material contains 95.5 percent Pt, 2.8 percent Ir, 1.2 percent Rh, and 0.5 percent Pd (Mertie, 1976). The creek flows across Paleozoic or Mesozoic sedimentary and igneous rocks that are intruded by the Jurassic Red Mountain ultramafic pluton (Hoare and Coonrad, 1978). Dunite of this pluton is within a few hundred feet of the upstream limit of the creek.
Geologic map unit (-161.712226626921, 58.9792168173707)
Mineral deposit model Placer PGE-Au (Cox and Singer, 1986; model 39b)
Mineral deposit model number 39b
Age of mineralization Quaternary.

Production and reserves

Workings or exploration Some exploration drill holes have probably been drilled along this creek; no mining has been reported.
Indication of production None
Reserve estimates Fechner (1988, p. 28) estimates that there are 500,000 cubic yards of material grading 0.0030 ounce of PGM per cubic yard in McCann Creek.

References