Main commodities | Ag; Au |
---|---|
Other commodities | Pb; Zn |
Ore minerals | arsenopyrite; galena; sphalerite |
Gangue minerals | quartz |
Quadrangle map, 1:250,000-scale | AN |
---|---|
Quadrangle map, 1:63,360-scale | A-4 |
Latitude | 61.08 |
Longitude | -148.28 |
Nearby scientific data | Find additional scientific data near this location |
Location and accuracy | On north shore of Harriman Fiord, on eastern point of the inlet into which the Serpentine Glacier flows. Accurate within 0.5 mile. Locality 54 of Cobb (1972), locality 43 of MacKevett and Holloway (1977), and locality A-31 of Jansons and others (1984). |
Geologic descriptionLate Cretaceous Valdez Group graywacke cut by many altered granite dikes and other bodies of Tertiary age. Resulting fissure veins, 2 to 18 inches thick, in graywacke and one in granite dike are quartz-filled. Veins strike N 15 to 40 W, near vertically, and carry galena, gold, arsenopyrite, and sphalerite (Johnson, 1914). Six samples contained up to 0.02 oz /ton Au and up to 0.04 oz /ton Ag. One vein sampled contained 1.99 oz/ton Au and .2 oz/ton Ag (Jansons and others, 1984). | |
Geologic map unit | (-148.282100154896, 61.0794396462195) |
---|---|
Mineral deposit model | Chugach-type low-sulfide Au-quartz veins (Bliss, 1992; model 36a.1). |
Mineral deposit model number | 36a.1 |
Age of mineralization | Tertiary or younger; veins cut Late Cretaceous Valdez Group graywacke and altered granite dikes of Tertiary age. |
Workings or exploration | Johnson (1915) reports that in 1914, 250 ft of tunnels and 2 shallow shafts were reported to have been driven on the veins about 100 ft above sea level. Jansons and others (1984) reported two adits in excess of 275 ft in length with a 64 ft winze; the lower level was inaccessible. Six samples contained up to 0.02 oz /ton Au and up to 0.04 oz /ton Ag. One vein sampled contained 1.99 oz/ton Au and .2 oz/ton Ag. Moderate mineral development potential for a small mine if vein extension is located (Jansons and others, 1984). |
---|---|
Indication of production | Yes; small |
Production notes | Recorded production of 83 oz gold and 33 oz silver (Jansons and others, 1984). |
MRDS Number | A011658 |
---|---|
Reporters | D.P. Bickerstaff (USGS contractor); S.W. Huss (USGS) |
Last report date | 7/30/1998 |