Unnamed (between Togiak River and Ongivinuck River)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Ag; As; Sb
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale GO
Quadrangle map, 1:63,360-scale B-2
Latitude 59.45
Longitude -159.64
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is between the Togiak River and Ongivinuck River basins, about 8 km south of Togiak Lake. It is area 6 of Kilburn and others (1992) and is approximately located, perhaps within 1 or 2 miles. For this record, the map site is at an elevation of about 1,350 feet at the head of an unnamed creek, in the NW1/4 of section 34, T 8 S, R 61 W, of the Seward Meridian.

Geologic setting

Geologic description

This occurrence is assumed to be within a Cretaceous or Tertiary granitic stock and surrounding hornfels that underlie this area (Hoare and Coonrad, 1978). Samples of diorite and hornfels contain up to greater than 10 ppm Hg (Coonrad and others, 1978). Quartz veinlets that occur within and parallel to an altered mafic dike that cuts diorite contain up to 0.23 ppm Ag, 0.25 ppm Au, 1.4 ppm Hg, and 60 ppm Sb (Kilburn and others, 1992); the host mafic dike contains 13.4 ppm Hg.
Geologic map unit (-159.642214616346, 59.4492457190622)
Mineral deposit model Epithermal mercury
Age of mineralization Probably Late Cretaceous or Early Tertiary. Mineralization may be related to the granitic pluton in the area, which is inferred to be part of a regionally extensive Upper Cretaceous and Lower Tertiary plutonic suite (Hoare and Coonrad, 1978).
Alteration of deposit Silicification and oxidation.

Production and reserves

Workings or exploration Reconnaissance geochemical rock sampling has been completed in the area.
Indication of production None

References