Unnamed (west of Eek Lake)

Occurrence, Undetermined

Commodities and mineralogy

Main commodities Ag; Cu; Mo; Zn
Ore minerals chalcopyrite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale CR
Quadrangle map, 1:63,360-scale A-3
Latitude 55.17592
Longitude -132.68003
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an uncertain location west of Eek Lake. For this record, the coordinates are at about the middle of the west shore of Eek Lake in section 24, T. 77 S., R. 84 E. Alternatively, the occurrence may be on the west side of the large unnamed lake just to the south in section 25. It thus may be a mile or more from the coordinates.

Geologic setting

Geologic description

While following up a geophysical anomaly in 1992, Alaska Copper and Nickel Company found what they originally thought was a stratiform pyrite-chalcopryite deposit on the west side of Eek Lake (Hedderly-Smith, 1999 [Inventory]). Samples across 1 meter of outcrop contained 5.2 to 10 percent copper, 251 to 269 parts per million (ppm) zinc, and 5.0 to 6.1 ppm silver. The company subsequently revisited the property and concluded that it was a vein, based on samples that contained up to 111 ppm molybdenum. There is no other information about the deposit. It may be on either side of a fault contact between greenstone, schist, and phyllite of the Wales Group of Late Proterozoic and Cambrian age and sedimentary rocks of the Descon Formation of Silurian and Ordovician age (Eberlein and others, 1983; Brew, 1996).
Geologic map unit (-132.681686321039, 55.1755693082334)
Mineral deposit model Ambiguous.

Production and reserves

Workings or exploration Limited surface sampling by industry in 1992.
Indication of production None

References

References

Reporters D.J. Grybeck (Applied Geology)
Last report date 5/1/2004