Unnamed (ridge northwest of Kankone Peak)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag
Other commodities Pb; Zn
Ore minerals galena; goethite; jarosite; pyrite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MM
Quadrangle map, 1:63,360-scale C-2
Latitude 63.6272
Longitude -150.6147
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 4050 feet on a northwest- trending ridge crest, about 1/2 mile northwest of Kankone Peak. The location is accurate within 500 feet. The occurrence corresponds to mineral deposit 281 of Hawley and Associates (1978), and occurrence 97 of Thornsberry, McKee, and Salisbury (1984).

Geologic setting

Geologic description

The country rocks at this occurrence are quartzite and mica-quartz schist of the Birch Creek Schist. The schistosity strikes NE and dips moderately SE (Bundtzen, 1981; Thornsberry, McKee, and Salisbury, 1984, fig. K-2).
The occurrence is an iron-stained shear zone that trends about N. 55 E. and can be traced for about 1200 feet. The zone contains minor amounts of quartz; it is strongly oxidized and leached, but the former presence of pyrite is suggested by the limonite minerals goethite and jarosite. One sample contained 6800 ppm lead, and 6000 ppm zinc (Hawley and Associates, 1978, fig. 4.1-A(1), sample number 281), suggesting that small amounts of galena and sphalerite, or their oxidized equivalents, are present. The sample also contained 31 ppm silver. Thornsberry, McKee, and Salisbury (1984, v. 2) reported anomalous amounts of silver, lead, and zinc from weathered surface material at the site.
Geologic map unit (-150.616987887774, 63.6267024085362)
Age of mineralization The deposit is assumed to be Eocene (see record MM091).
Alteration of deposit Oxidation and leaching of sulfide(?)-bearing shear zone.

Production and reserves

Workings or exploration There are no workings.
Indication of production None

Additional comments

The occurrence is in Denali National Park and Preserve.

References