Heather Creek

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au
Other commodities As; Hg
Ore minerals pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale PM
Quadrangle map, 1:63,360-scale A-2
Latitude 55.177
Longitude -160.615
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is at an elevation of about 600 feet, on Unga Island approximately 5,000 feet due south of the top of Apollo Mountain (Wilson and others, 1988, locality 50). Location is accurate to within 1,200 feet. Heather Creek is not named on the A-2 topographic map.

Geologic setting

Geologic description

Peterson and others (1982) described this occurrence as a northeast-striking quartz vein system containing quartz veins less than a foot in width. The system is discontinuous along a 2,500 foot strike length and includes a knob of brecciated and silicified andesite 100 feet wide and 1,000 feet long characterized by numerous quartz-filled vugs and limonitic shears. Pyrite is the only sulfide that has been identified. The veins system cuts andesite flows and tuffs of the late Eocene to early Oligocene Popof volcanic rocks (Wilson and others, 1995). Grab samples from the knob contained as much as 0.23 ppm gold, 10 ppm silver, 390 ppm arsenic, and 0.28 ppm mercury. Channel samples of the veins contained as much as 0.02 ppm gold, 3.8 ppm silver, and 0.35 ppm mercury.
Ellis and Apel (1990) described the occurrence as a 50- to 150-foot-wide, totally silicified and brecciated fault zone exhibiting multiple episodes of brecciation and mineralization. The zone extends 7,000 feet on strike from the California vein adit (PM082) west-southwest to Heather Creek. Argillic alteration forms halos 5 to 100 feet wide in tuff or flow wall rock. Samples of silicified breccia collected at approximately 200-foot intervals at selected sites along the trend contained as much as 0.414 ppm gold, more than 100 ppm arsenic, and more than 1.0 ppm mercury.
Geologic map unit (-160.617065494022, 55.1761650193836)
Mineral deposit model Epithermal gold veins
Age of mineralization Eocene or younger.
Alteration of deposit The main mineralized zone has been silicified, whereas the wall rocks exhibit strong argillization.

Production and reserves

Workings or exploration
Resource Associates of Alaska and UNC Teton Exploration Drilling Company mapped and sampled the prospect in 1981and 1982. Grab samples from the knob contained as much as 0.23 ppm gold, 10 ppm silver, 390 ppm arsenic, and 0.28 ppm mercury. Vein channel samples contained as much as 0.02 ppm gold, 3.8 ppm silver, and 0.35 ppm mercury.
Battle Mountain Exploration collected 56 rock samples in 1990; these contained as much as 0.414 ppm gold, more than 100 ppm arsenic, and more than 1 ppm mercury.
Indication of production None

References

MRDS Number 10308150

References

Ellis, W.T., and Apel, R.A., 1990, Unga/Alaska Peninsula 1990 final report: Battle Mountain Exploration Company report, 49 p., 29 map sheets at various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.)
Peterson, R.J., Lemmers, J., Handverger, P., Gallagher, J., Pilcher, R., East, J., Macleod, T., Bartels. E., 1982, Geology and precious metals potential Unga, Popof, and Korovin Islands, Shumagin Group, Aleutian Chain, Alaska: UNC Teton Exploration Drilling Company report, 127 p., 5 map sheets, various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.)
Webber, B.S., Moss, J.M., Rutledge, F.A., and Sanford, R.S., 1946, Reconnaissance examinations of parts of the Alaska Peninsula and Aleutian Islands southwestern Alaska: U.S. Bureau of Mines, unpublished report of investigations, 40 p. (Report held by the U.S. Geological Survey, Anchorage.)
Reporters S.H. Pilcher
Last report date 1/20/2001