Unnamed (near mouth of Columbia Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu; Pb; Zn
Other commodities Au; Cd; Hg
Ore minerals chalcopyrite; galena; pyrite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale EA
Quadrangle map, 1:63,360-scale B-1
Latitude 64.4313
Longitude -141.3516
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is located in an outcrop on the east side of the Taylor Highway near the mouth of Columbia Creek. The occurrence is in section 35, T. 5 S., R. 32 E., of the Fairbanks Meridian. The location is accurate within 1,000 feet.

Geologic setting

Geologic description

The rocks in the vicinity of this occurrence are predominantly Paleozoic greenschist-facies black carbonaceous quartzite (Dusel-Bacon and others, 1998). Approximately 1.5 miles to the south, these rocks are in fault contact with Paleozoic amphibolite-facies metamorphic rocks (Foster, 1976). Sulfides occur in a carbon-free or carbon-poor quartzite that is interpreted to be metachert or possibly a metamorphosed exhalite(?). This occurrence is interpreted to be a sedimentary-exhalative massive sulfide occurrence by Dusel-Bacon and others (1998), but the presence of possible felsic metavolcanic rocks indicates that it could be a Kuroko-type volcanogenic massive sulfide deposit. The host rock is a tan to pale-gray quartzite with minor muscovite. The quartzite is interlayered with more muscovite-rich quartzite and muscovite schist, which may have originally been felsic tuff. Sulfides occur as discontinuous lenses, 1 to 2 centimeters thick, that contain sphalerite, and lesser galena and chalcopyrite (Dusel-Bacon and others, 1998). A sample of this material contains 8.1 percent zinc, 100 ppm cadmium, 38 ppb gold, and 132 ppm mercury.
Geologic map unit (-141.353899438519, 64.4309964279908)
Mineral deposit model Sedimentary exhalative massive sulfide or Kuroko-type volcanogenic massive sulfide (Cox and Singer, 1986; model 31a or 28a).
Mineral deposit model number 31a or 28a
Age of mineralization Paleozoic or younger.

Production and reserves

Indication of production None