Natmotirak Creek

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Ag
Ore minerals chalcopyrite; malachite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale AR
Quadrangle map, 1:63,360-scale C-6
Latitude 67.69
Longitude -158.89
Nearby scientific data Find additional scientific data near this location
Location and accuracy Located along Natmotirak Creek in T. 26 N., R. 1 W., Kateel River Meridian. Shown as locality 3 in Mayfield and Grybeck (1978) and is accurate to within 2000 ft. (600 m).

Geologic setting

Geologic description

Visible chalcopyrite and malachite in less than 3 ft. (1 m) wide quartz vein cutting limestone (Mayfield and Grybeck, 1978). Occurrence could be similar to several other sediment-hosted occurrences in the Brooks Range that formed from the dewatering of a large sedimentary basin (Schmidt, 1997, p. 35-65; Schmidt and Werdon, 1993, p. 143).
Geologic map unit (-158.892878420152, 67.6894247679292)
Mineral deposit model Sediment-hosted Pb-Zn (Cox and Singer, 1986; model 31a)?
Mineral deposit model number 31a?
Age of mineralization Paleozoic?

Production and reserves

Workings or exploration 10 ppm Ag in one rock sample (Mayfield and Grybeck, 1978).
Indication of production None

Additional comments

Located within Noatak National Preserve.

References

MRDS Number A011852
Reporters K.R. Leonard (USGS), R.L. Elliott (USGS), J.M. Schmidt (USGS), S.W. Nelson (USGS retired)
Last report date 5/8/1997