Study of geothermal resource assessment of Idaho Springs, Gilpin County. Includes geology, hydrology, geophysics, and geochemical resources. 50 pages. 17 figures. 10 tables. 6 appendices. Digital PDF download. RS-16D
Located in the Front Ranges of the Rocky Mountains approximately 30 miles west of Denver, in the community of Idaho Springs, are a series of thermal springs and wells. All the thermal waters in Idaho Springs are located at the Indian Springs Resort on the south side of the city.
At the Indian Springs Resort are three thermal springs and three thermal wells ranging in temperature from a low of 68°F (20°C) to a high of l27°F (53°C). The spring discharge rates range from <1 to 21 gpm, and the wells yield about 3 to 36 gpm. Total dissolved solids in the springs range from 1,070 to 2,110 mg/l, with the waters being a sodium-bicarbonate type. The hot springs in Idaho Springs are located at the confluence of Soda Creek and Clear Creek, and at the intersection of a northeast trending, highly mineralized fault zone. The investigation showed that the thermal waters most likely are fault controlled and the thermal area does not have a large areal extent. Water quality data from these springs is included in the report appendix. Also included in this report is an evaluation of soil mercury as a geothermal exploration tool used to delineate faults or permeable zones.