Assessment of Geothermal Resources in the Wilbur Hot Springs Area, Colusa and Lake Counties, California - Final Project Report
Publication Number: CEC-500-2013-140
Report Date: March 2013
Assessment of Geothermal Resources in the Wilbur Hot Springs Area, Colusa and Lake Counties, California
Final Project Report. (PDF file, 31 pages, 4.2 mb).
Appendices (PDF file, 435 pages, 27.8 mb)
This report presents the results of mapping, rock and water sampling, and geophysical surveys conducted by Renovitas and its project partner, the Sacramento Municipal Utility District, to assess the geothermal resource potential in the Wilbur Hot Springs area and vicinity. The mapping, sampling and surveys were conducted on Bureau of Land Management and California Department of Fish and Game land located in Colusa and Lake Counties in northern California, on property with mineral rights owned by the Trebilcot family.
The goal of this project was to conduct the preliminary resource assessment, geologic mapping and geophysical surveying work necessary to site future temperature gradient or slim-hole geothermal wells in the area. The results from this project provided data needed to determine if the Wilbur Hot Springs area is a viable geothermal resource. The data will be used to plan for future work to ascertain if there is sufficient geothermal potential in the project area for power plant development.
The project work included analysis of existing literature; geological, geochemical and geophysical sampling activities; and development of an exploratory drilling work plan. Data generated by the mapping and geophysical surveys allowed the project team to develop a conceptual model of the geothermal system in the project area. This conceptual model indicated that the geothermal resource in the project area may have geothermal temperatures sufficient for binary power production. However, further exploration and slim-hole well drilling will be required to generate the additional data needed to fully assess the resource. Recommendations for future work are to conduct outreach to stakeholders, prepare California Environmental Quality Act documents and obtain permits for drilling, drill slim-hole wells to further evaluate the resource and prepare a feasibility assessment for power development.