1. Mineral Resources
  2. Online Spatial Data
  3. Alaska Resource Data File (ARDF)

Steph

Occurrence, Inactive

Map
KML
XML
GeoJSON

Commodities and mineralogy

Main commodities Ag; Cu
Ore minerals azurite; malachite; tennantite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale CH
Quadrangle map, 1:63,360-scale D-4
Latitude 67.86
Longitude -148.81
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Steph occurrence is at an elevation of about 3,800 feet, approximately 5 1/2 miles west-northwest of Reds Lake in the hills north of and overlooking the North Fork Chandalar River (NW1/4 sec. 13, T. 35 N., R. 6 W., of the Fairbanks Meridian). The reference point corresponds to loc. 69 in DeYoung (1978) and is accurate within a 1/2-mile radius.

Geologic setting

Geologic description

This occurrence is described as malachite, azurite, and tennantite in a quartz vein (Grybeck, 1977). The country rocks are Devonian Skajit Limestone near a large body of greenstone interpreted as schistose hornblende diorite, pyroxene diorite sills, and andesitic flows(?) (Brosgé and Reiser, 1964). No other information is available.
Geologic map unit (-148.812767794025, 67.8596120404988)
Mineral deposit model Polymetallic veins? (Cox and Singer, 1986; model 22c?).
Mineral deposit model number 22c?

Production and reserves

Workings or exploration Claims (15?) staked by Placid Oil Co. in 1971-1973.
Indication of production None

Additional comments

See also: Bibban (CH090), Bob (CH089), Gayle (CH091), and Mowgli (CH094).

References

MRDS Number A012152

References

Cobb, E.H., and Cruz, E.L., 1983, Summaries of data and lists of references to metallic and selected nonmetallic mineral deposits in the Chandalar quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-278, 91 p.
DeYoung, J.H., Jr., 1978, Mineral resources map of the Chandalar quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-878-B, 2 sheets, scale 1:250,000.
Grybeck, Donald, 1977, Known mineral deposits of the Brooks Range, Alaska: U.S. Geological Survey Open-File Report 77-166C, 45 p., 1 sheet, scale 1:1,000,000.
Reporters J.M. Britton (Anchorage)
Last report date 11/17/1999