Unnamed (east of upper Trail Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Pb; Zn
Ore minerals galena; sphalerite; tetrahedrite
Gangue minerals carbonate minerals; quartz

Geographic location

Quadrangle map, 1:250,000-scale NB
Quadrangle map, 1:63,360-scale C-5
Latitude 62.6135
Longitude -143.2277
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on a high ridge east of upper Trail Creek. It is at an elevation of about 6,000 feet, 3,600 feet northwest of peak 7080 and 5,800 feet east of Trail Creek. The occurrence is about 0.3 mile south-southwest of the center of section 30, T. 10 N., R. 12 E. of the Copper River Meridian. This is locality 2 of Richter and Schmoll (1973), locality 8 of Richter and others (1975), and National Park Service locality WRST-8 (unpublished data). Cobb and Richter (1980) included this locality as an 'Unnamed' occurrence'. It is located to within a few hundred feet.

Geologic setting

Geologic description

Small quartz-carbonate veins that contain galena, sphalerite, and tetrahedrite occur in the border zone of a small diorite porphyry stock (Richter and others, 1975). The diorite porphyry stock, part of a Cretaceous or Tertiary intrusive suite, intrudes Triassic limestone at this locality.
Geologic map unit (-143.229851403863, 62.6131350281358)
Mineral deposit model Polymetallic veins (Cox and Singer, 1986; model 22c)
Mineral deposit model number 22c
Age of mineralization Cretaceous or Tertiary. The host diorite porphyry is part of an intrusive suite that cuts rocks as young as Jurassic or Cretaceous in the headwaters of Trail Creek (Richter and Schmoll, 1973; Richter, 1976).

Production and reserves

Workings or exploration Only reconnaissance surface observations.
Indication of production None

Additional comments

The occurrence is in the Wrangell-St. Elias National Preserve.

References