Geologic descriptionAnomalous metal concentrations in rock samples collected from the Lime Peak area are associated with two styles of mineralization: skarn, developed near the contact zone of the Lime Peak pluton; and greisen, developed within the Lime Peak pluton (Burton and others, 1985, p. 15). Samples of skarn, collected from near the northern and southeastern intrusive contacts contain elevated to anomalous concentrations of tin and tungsten. The highest values were detected in iron-stained, magnetite-pyrrhotite-pyroxene skarn rubble, with one sample containing 220 ppm Sn and 100 ppm W (Burton and others, 1985, p. 15). Smith and others (1987), analyzed bulk samples of calc-silicate rocks in this area with resulting grades of 0.003 to 0.03 oz/ton Sn, 0.03 to 0.1 oz/ton Ag, 0.01 to 0.03 percent Cu, and 0.03 to 0.8 percent Zn. Because of the low abundance of carbonate rocks in the area and the considerable distance from known mineralizing granite units, Smith and others (1987) conclude that the Lime Peak area skarns/calc-silicate rocks are not of current or likely future economic interest. |
