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25-million-year-old caldera. These sediments constituted the reservoir for convecting hydrothermal fluid responsible for the deposition of silver and base-metal ores in the adja- cent Creede Mining District. The study provides a useful background to studies of active hydrothermal systems at the Salton Sea, Valles Caldera, Inyo Domes, and Long Valley Caldera. At Creede, much of the fossil geothermal system has been exposed through erosion and thus is more read- ily accessible by drilling than are the younger and deeper active systems. In response to the declines in steam production and quality, a scientific coring project at the bottom of an existing 1,340-meter-deep production well at The Gey- sers geothermal field penetrated another several hundred meters into its steam reservoir. This DOE-funded study, the Geysers Coring Project, provided much needed core mate- rial from the Geysers region and new constraints on the timing of magmatism, volcanism, and the onset of vapor- dominated conditions in the area. Currently, an “enhanced geothermal systems” (EGS) project is being proposed for The Geysers. It involves drilling below the current produc- tion zone into the high temperature (greater than 350°C) zone, the creation of a reservoir by hydraulic fracture, and the mining of heat to supplement that being obtained from the existing steam reservoir. Another EGS project in the planning stage is the Iceland Deep Drilling Project (IDDP). Iceland presently has the capacity to produce about 200 megawatts of electric power along the part of the Mid-Atlantic Rift system that traverses that country. The reservoirs are hot water-brine systems at temperatures between 200 and 300°C. There is some opposition to developing new hydrothermal systems, mainly on aesthetic grounds, and the IDDP is seeking to gain a better understanding of the deeper temperature regime (400 to 500°C) at one or more of the existing reservoirs to assess the feasibility of mining heat from these zones in addition to what is being produced from the conventional reservoirs. This would allow significant increases in energy output without disturbing otherwise pristine areas. Initial deployment of the DOSECC (Deep Observation and Sampling of the Earth’s Continental Crust) hybrid coring system was at Long Valley California. Shown, is the hydraulic coring head suspended from the mast of a large oilfield drilling rig. (U.S. Geological Survey photograph.) Geothermal Energy—Clean Power From the Earth’s Heat� 35PDF Image | Geothermal Energy 1249 USGS
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