| Quadrangle map, 1:250,000-scale | ID |
|---|---|
| Quadrangle map, 1:63,360-scale | B-4 |
| Latitude | 62.48893 |
| Longitude | -157.91155 |
| Nearby scientific data | Find additional scientific data near this location |
| Location and accuracy | The Golden Ground or Neilson prospect is at an elevation of about 1,750 feet in a nearly flat saddle on the flank of a steep west-facing hill at the head of Granite Creek. The prospect is about 2.6 miles north-northeast of Discovery camp on Otter Creek and about 0.1 mile northwest of the center of section 25, T. 28 N., R. 47 W., of the Seward Meridian. The location is accurate. |
Geologic descriptionThe Golden Ground or Neilson prospect is a thin, north-trending, steeply dipping, quartz-sulfide vein associated with a swarm of veinlets that cut augite basalt that forms a roof pendant overlying a monzodiorite stock. The stock has been dated as 70.5 Ma (Bundtzen and others, 1992; Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). The vein varies from 0.4 to 2 inches thick and has been explored by two adits with 50 to 60 feet of drift (Holzheimer, 1926). The thin quartz veins contain megascopic grains of arsenopyrite, galena, scheelite, and pyrite. Grab samples contain up to 50.0 parts per million (ppm) gold, 2,000 ppm silver, 2.00 percent lead, 1.00 percent antimony, 5,000 ppm copper, 2,000 ppm tungsten, 1,000 ppm zinc, more than 1.00 percent arsenic, 300 ppm cadmium, 40 ppm bismuth, and more than 10.0 ppm mercury (McGimsey and others, 1988). The high silver, copper, lead, arsenic, and antimony, values suggest that unidentified sulfosalt minerals are also present. One sample contained the highest silver value known from the Iditarod quadrangle. | |
| Geologic map unit | (-157.913950342311, 62.488246544737) |
|---|---|
| Mineral deposit model | Polymetallic vein (Cox and Singer, 1986; model 22c). |
| Mineral deposit model number | 22c |
| Age of mineralization | Undated; the nearby monzodiorite pluton is 70.6 Ma (Bundtzen and others, 1992). |
| Workings or exploration | Lode prospecting in this area was reported by Brooks (1914). The Golden Ground vein was possibly discovered or developed by Rasmus Neilson, a Danish geologist who discovered the Golden Horn vein (ID115). The prospect was explored with 50 to 60 feet of drifts before 1926 (Holzheimer, 1926). Additional lode activity was reported in the area by Mertie (1936). Surface samples were collected by the Alaska Division of Geological and Geophysical Surveys and U.S. Geological Survey in the 1980s (McGimsey and others, 1988; Bundtzen and others, 1992). An exploration tunnel that was caved by 1933 and described by Cobb (1976 [OFR 76-576]) as the Malemute Gulch lode may be this prospect. |
|---|---|
| Indication of production | Undetermined |
| Production notes | According to John Miscovich (oral communication , 2002) a small amount of high-grade gold ore from the Golden Ground prospect may have been included with production from the Golden Horn Mine (ID115). |
References | |
| Reporters | T.K. Bundtzen (Pacific Rim Geological Consulting, Inc.), M.L. Miller (U.S. Geological Survey); and C.C. Hawley (Hawley Resource Group) |
|---|---|
| Last report date | 5/19/2003 |