Unnamed (on ridge between Buckskin and Franklin Creeks)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Pb; Zn
Ore minerals limonite
Gangue minerals garnet; quartz

Geographic location

Quadrangle map, 1:250,000-scale EA
Quadrangle map, 1:63,360-scale A-2
Latitude 64.1771
Longitude -141.9057
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is located on the ridge between Buckskin Creek and Franklin Creek, about 3.9 miles west-northwest of the old town of Franklin and about 0.3 mile north of hill 3125. The coordinates are in section 36, T. 8 S., R. 29 E., of the Fairbanks Meridian. The location is accurate.

Geologic setting

Geologic description

The rocks in the vicinity of this occurrence are primarily interlayered Paleozoic amphibolite-facies paragneiss, amphibole-feldspar gneiss, and amphibolite (Werdon and others, 2001). These units have been intruded by small, slightly foliated, Jurassic granitic plutons and dikes and widely-scattered Jurassic biotite clinopyroxenite dikes. The metamorphic rocks adjacent to the granitic intrusions have been hornfelsed and are cut by sparse quartz and limonite veins. An assay of these veins contains 504 ppm zinc. A garnet-quartz skarn with disseminated limonite (pseudomorphs after unknown sulfide) contains 850 ppm zinc (Werdon and others, 2000).
Geologic map unit (-141.907989152277, 64.1767700889288)
Mineral deposit model Zinc skarn.
Age of mineralization Probably Jurassic.
Alteration of deposit Hornfelsing and calc-silicate alteration of gneiss.

Production and reserves

Indication of production None