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Montana Geothermal Sites: Marysville
SUMMARY INFORMATION:
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| Location: N 46.7544 W 112.3750 Nearest town: 35 miles south of Hamilton County: LEWIS AND CLARK Depth: 6890 ft exploration well Temperature: 217° F Flow: Not Available TDS: 672 (mg/L) Site ID: MGEOT069 LOCATE AND VIEW VIA NRIS DIGITAL MAP LOCATOR: Allows topos to be resized and access to aerial photographs. |
CHEMISTRY (ppm, mg/L) Site name: MARYSVILLE Temp: 97º C TDS: 672 pH: 6.62 Sodium: 208 Potassium: 10 Calcium: 7.7 Magnesium: 0.4 Iron: 0.02 Boron: 100 SiO2: 68.5 Sulfate: 176 Chloride: 51 Fluoride: 20 |
The USGS and NSF supported extensive research in Marysville in the early 1970s. This included drilling test well MGE-1 to a total depth of 2,100 meters in 1975. The geothermal testing was based on a regional heat flow survey of holes drilled for mineral exploration. There are no surface thermal manifestations. The highest temperature measured was 103 C (217 F). The anomaly shows high heat flow over a 50-square-kilometer area. The well intercepts Oligocene granite porphyry, but the source of water is unknown. Geochemical indicators of reservoir temperatures are as high as 180° C. The well is maintained but unused.
