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3. Digital Geologic Data The purpose of gathering pre-existing geologic maps is to minimize time spent on reproducing already published information. There were several geologic maps available for the Stanley area that were used for this study. The United States Geological Survey (USGS) has compiled and digitized several maps of the western states at a scale of 1:500,000. At this scale, it is easy to identify regional structural trends and also regional trends in major rock types. For a more detailed look at the Stanley area, a digitized map created by the USGS of the Challis 1° x 2° Quadrangle was used (1:250,000). This map allowed for a more detailed look at local rock types and fault density. Aerial photographs and satellite images were also used for a vast majority of maps created for this project. These photos were downloaded from the Inside Idaho website along with statewide coverage of highways. Statewide coverage of geothermal springs and wells, and statewide coverage of cities were obtained from the Idaho Department of Water Resources website. Digital Elevation Models or DEM’s were obtained from the National Seamless Server operated by the USGS as part of their National Elevation Dataset (NED) program. The DEM’s were important in creating and interpreting linear features near the Stanley area. All of these different datasets were imported into ESRI’s ArcGIS software for manipulation. All subsequent maps created for this project were made in this program. 4. Hydrochemistry/Geothermometry and Thermal Gradients The chemistry of regional thermal waters was obtained from background literature review. Several studies have been done in the Stanley area, reporting waters of non-magmatic sources (Druschel and Rosenburg, 2001; Krahmer, 1995; Criss and Taylor, 1983; Young, 1985; Young and Lewis, 1982). For our local study of the Stanley geothermal system, we obtained 8 samples for analysis. From this analysis, we have concluded that the waters in the Stanley geothermal system are also of non-magmatic affinity. Water quality is an important factor when considering use of geothermal water. In the Stanley area, the quality of thermal waters is quite good, with total dissolved solid (TDS) values ranging from 158-300 mg/L. Fluoride is the only chemical constituent of the thermal spring waters that exceeds water quality standards. The high concentration of Fluoride is most likely related to the volcanic rocks in which these waters interact. Geothermometers were used to calculate potential reservoir temperatures based on measured concentrations of chemical constituents. The maximum calculated temperature is 142° C at Sunbeam Hot Springs, using the Giggenbach Na/K geothermometer. Reservoir temperatures for the Stanley Bathing Pool (Stanley Hot Springs) range from 60° to 83° C (John Welhan, written communication, 2011, Table 2). The quartz geothermometer predicted temperature of 112°C on table 2 is below the recommended threshold of 140°C for that geo-thermometer. The chalcedony geo-thermometer temperature of 83°C may be a more reliable predictor of reservoir temperature in the Stanley Hot Springs area, (Table2). The difference in predicted subsurface temperatures in springs near the Stanley Bathing Pool probably reflects the degree of mixing with cooler ground waters prior to discharging at the surface. The high predicted temperature for Sunbeam Hot Springs reflects minimal, if any mixing of 3PDF Image | Stanley Geothermal Feasibility Study
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