Mines and prospects of the Dillon 1 degree x 2 degrees Quadrangle, Idaho and Montana

Mineral resource potential of National Forest RARE II and wilderness areas in Idaho

“…The Anderson Mountain area is part of the Gibbonsville gold mining district. Both lode prospects in quartzite and placer prospects are present around the perimeter of the study area; several of the prospects have a history of production (Loen and Pearson, 1984).…”

“…Numerous small lode deposits in quartzite and placer prospects are located in the area. Two major gold producing mines are located within the West Big Hole area: the Oro Cache mine, at the southeastern end of the northern section, and the Goldstone mine, at the central-eastern border of the southern section (Loen and Pearson, 1984).…”

Lineaments and their association with metal deposits, Ruby Mountains, Montana

“…Table 1 also shows that certain lithologies tend to host specific types of deposits. Note that 12 of the 13 Cu deposits occur within a quartzofeldspathic gneiss (Aqf), all the Mn deposits occur within veins in a marble (Am), and both Fe deposits are in the bedded iron formation (Ai) (Loen and Pearson, 1984).…”

“…Lineaments were mapped from both types of images at a 1:250,000 scale covering the entire Dillon 1° x 2° quadrangle as part of the U.S. Geological Survey's Conterminous U.S. Minerals Appraisal Program by Purdy and Rowan (in press). Landsat data is biased against detection of northwest trending lineaments and in favor of northeast trends, due to the southeastern solar illumination at the time of Loen and Pearson (1984). Status: M= mine with recorded production, P= prospect or mine, no production or production unknown, 0= occurrence.…”

“…Figure 1 shows the study area boundaries, the proposed wilderness, known metal deposits (keyed to Table 1), and hydrothermally altered areas (Segal and Rowan, in press). Talc deposits are common (Heinrich, 1960;Loen and Pearson, 1984) but were excluded from this report, which focuses on metals. Copper, manganese, and iron are the most common metals, although lead, nickel, chromium, and uranium are also present.…”