| Main commodities | Au |
|---|---|
| Other commodities | Pb; W; Zn |
| Ore minerals | arsenopyrite; galena; gold; pyrite; scheelite; sphalerite |
| Quadrangle map, 1:250,000-scale | LG |
|---|---|
| Quadrangle map, 1:63,360-scale | A-1 |
| Latitude | 65.033 |
| Longitude | -147.464 |
| Nearby scientific data | Find additional scientific data near this location |
| Location and accuracy | Cobb (1972, MF-413), loc. 30; NW1/4 sec. 1, T. 2 N., R. 1 E., of the Fairbanks Meridian. The Rainbow mine is on the point of the ridge between Twin Creek and Skoogy Gulch at an elevation of 1,700 feet. |
Geologic descriptionGold is found in a nearly vertical, east-striking, quartz vein. The vein also contains pyrite, arsenopyrite, galena, sphalerite (Smith, 1913; B 525). The vein has been variously described as from 18 inches wide to 3 feet wide (Brooks, 1912; Chapin, 1914). The vein cuts schist, quartzite, and granite (Chapin, 1914). About 500 feet of underground workings were reported by 1912 (Brooks, 1912). Four hundred and eighty tons of ore was shipped from these workings (Chapin, 1914). The vein contained 1.11 ounces of gold per ton with a narrow 2 inch band containing 10.26 ounces of gold per ton (Hill, 1933). | |
| Geologic map unit | (-147.46644414402, 65.0325760742407) |
|---|---|
| Mineral deposit model | Polymetallic vein (Cox and Singer, 1986; model 22c). |
| Mineral deposit model number | 22c |
| Alteration of deposit | Quartz, iron- and manganese-stained in places. |
| Workings or exploration | Workings consisted of a vertical shaft 100 feet deep and 270 feet of drifts on the vein (Smith, 1913; B 525). The vein was also marked by surface pits (Chapin, 1914). The old shaft and adit were inaccessible in 1931 (Hill, 1933). |
|---|---|
| Indication of production | Yes; small |
| Production notes | By 1914, 480 tons of ore had been shipped (Chapin, 1914). |