Unnamed (near headwaters of Humbolt Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au; Pb
Other commodities Sn; Zn
Ore minerals galena
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale BN
Quadrangle map, 1:63,360-scale D-5
Latitude 65.81
Longitude -164.48
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on the north side of the central headwater tributary to Humbolt Creek. Humbolt Creek is a northeast-flowing tributary to Goodhope River. The occurrence is 3,500 to 4,000 feet north of the continental divide and about 500 feet north of the the Humbolt Creek headwater. The locality is plotted separately by Sainsbury and others (1970, sample locality 23, Plate 1).

Geologic setting

Geologic description

Sainsbury and others (1970, Table 2) give analytical data for several rock and pan concentrate samples from this locality. It is in an area of extensive tundra cover (Till and others, 1986) and only 2,500 feet southeast of another galena-bearing locality (BN052). The possibility exists that the samples reported from here are actually from the unnamed galena-bearing occurrence closer to Humbolt Creek (BN052). However, this occurrence is described separately in keeping with the location given by Sainsbury and others (1970). Samples from this locality are described as galena in schist, stained float below galena prospect, quartz and galena, and cemented fault breccia (Sainsbury and others, 1970, Table 2). These samples contained up to 0.2 ppm Au, 150 ppm Ag, 500 ppm As, greater than 20,000 ppm Pb, 300 ppm Sb, 300 ppm Sn, and 1,500 ppm Zn. Epigenetic mineralization in this area is interpreted to have introduced into low grade, Lower Paleozoic metasedimentary rocks over buried parts of the Oonatut Granite Complex. The Oonatut Granite is part of the western Seward Peninsula tin granite suite (Hudson and Arth, 1983) and the polymetallic character of this mineralization may be reflective of the lead-zinc zone in tin deposit systems (Hudson, 1979).
Geologic map unit (-164.482712158093, 65.8092830955371)
Mineral deposit model Quartz and sulfide veins in schist
Age of mineralization Probably Late Cretaceous; this occurrence may be related to emplacement and crystallization of the Oonatut Granite Complex. K/Ar ages for the Oonatut Granite Complex are about 70 my (Hudson, 1979).

Production and reserves

Workings or exploration Shallow hand-dug prospect pits may be present.
Indication of production None

References