Three widely separated wells in the southern part of Big Smoky Valley are reported to have slightly anomalous water temperatures. The Emigrant well (NW¼ Sec. 6, T1N, R38E) had a reported temperature of 25ºC (Trexler and others, 1979, Table 1) or 26.7ºC (Rush and Schroder, 1970). It is reportedly 98.7 m deep and first encountered water at 93.9 m. An unnamed 166.4-m-deep well (NW¼ Sec. 14, T1N, R37E) had a reported temperature of 21.7 ºC. The Fishlake Livestock Co. well (SE¼ SE¼ Sec. 5, T1S, R39E) was reported to have a 0.63 L/min flow of hot water at 50.3 m; it was reported destroyed (Rush and Schroder, 1970). It appears that this well is in the vicinity of a geothermal anomaly defined by gradient-hole drilling (See GeothermEx, 2004, Alum-Silver Peak prospect). The maximum temperature encountered in drill holes was 118.3ºC at 453.8 m Geothermometry suggests a higher temperature geothermal system at depth (GeothermEx, 2004). The geothermal anomaly is centered on the Alum Mine (SE¼ SW¼ Sec. 29, T1N, R38½E, protracted on the Goldfield 30´x60´ topographic map), where native sulfur was mined in the 1920s. Native sulfur at the Alum Mine is found as crystals coating fractures in an altered rhyolite dike; potassium alum is also present as veins (Spurr, 1904; Branner, 1959). The deposit is apparently latest Pleistocene, as alunite associated with the sulfur has been dated by K-Ar methods at 0.29±0.01 Ma (Vikre, 2000, p. 751).