Unnamed (divide between Myrtle Creek and upper Caribou Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au; Pb
Other commodities As; Cu; Sb; Zn
Ore minerals arsenopyrite; galena; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MM
Quadrangle map, 1:63,360-scale C-2
Latitude 63.6041
Longitude -150.6516
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 4150 feet in a saddle on an unnamed ridge between Spruce Peak and Kankone Peak. It is on the divide between Caribou and Myrtle Creeks, in the NE1/4 NE1/4 section 21, T. 15 S., R. 16 W., Fairbanks Meridian. The location is accurate within 500 feet. The occurrence corresponds approximately to sample location 273 of Hawley and Associates (1978), and to occurrence 93 of Thornsberry, McKee, and Salisbury (1984).

Geologic setting

Geologic description

The country rock in the area of this occurrence is metafelsite of the lower Paleozoic Spruce Creek sequence (Bundtzen, 1981). The Spruce Creek rocks are in a downfaulted block about 3/4 mile wide that trends about NNE. The block is juxtaposed against Precambrian Birch Creek Schist (Bundtzen, 1981; Thornsberry, McKee, and Salisbury, 1984, fig. K-2).
The occurrence consists of galena- and probably arsenopyrite-bearing quartz float, presumably from a thin, poorly-exposed, vein. A galena-rich sample assayed 0.93 ounce of gold per ton, 112.4 ounces of silver per ton, 33 percent lead, 2.65 percent arsenic, 0.12 percent copper, 0.265 percent zinc, and 0.435 percent antimony. Soil from a saddle near the vein is anomalous in lead, zinc, and silver (Hawley and Associates, 1978, sample number 273).
Geologic map unit (-150.653885748233, 63.6036011081278)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization The deposit is assumed to be Eocene (see record MM091).

Production and reserves

Workings or exploration The vein was discovered in 1983 (Thornsberry, McKee, and Salisbury, 1984).
Indication of production None

Additional comments

The occurrence is in Denali National Park and Preserve.

References