Apacheta, a new geothermal prospect in Northern Chile

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The discovery of two high-temperature fumaroles, with gas geochemistry compatible with an economic geothermal system, established Apacheta as one of the most attractive geothermal exploration prospects in northern Chile. These remote fumaroles at 5,150 m elevation were first sampled in 1999 by ENAP and its partners, following up on the reports of a CODELCO water exploration well that flowed small amounts of dry steam at 4,540 m elevation in the valley 4.5 km east of the fumaroles. The prospect is associated with a Plio-Pleistocene volcanic complex located within a NW-trending graben along the axis of the high Andes. The regional ... continued below

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Urzua, Luis; Powell, Tom; Cumming, William B. & Dobson, Patrick May 24, 2002.

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The discovery of two high-temperature fumaroles, with gas geochemistry compatible with an economic geothermal system, established Apacheta as one of the most attractive geothermal exploration prospects in northern Chile. These remote fumaroles at 5,150 m elevation were first sampled in 1999 by ENAP and its partners, following up on the reports of a CODELCO water exploration well that flowed small amounts of dry steam at 4,540 m elevation in the valley 4.5 km east of the fumaroles. The prospect is associated with a Plio-Pleistocene volcanic complex located within a NW-trending graben along the axis of the high Andes. The regional water table is 4,200 masl. There are no hot springs, just the 88 degrees C steam well and the 109 degrees and 118 degrees C fumaroles with gas compositions that indicate reservoir temperatures of greater than or equal to 250 degrees C, using a variety of gas geothermometers. An MT-TDEM survey was completed in 2001-2002 by Geotermica del Norte (SDN), an ENAP-C ODELCO partnership, to explore the Apacheta geothermal concession. The survey results indicated that base of the low resistivity clay cap has a structural apex just west of the fumaroles, a pattern typically associated with shallow permeability within a high temperature geothermal resource. SGN plans to drill at least one exploration well in 2002-03 to characterize a possible economic resource at Apacheta.

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OSTI as DE00815476

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  • Geothermal Resources Council 2002 Annual Meeting, Reno, NV (US), 09/22/2002--09/25/2002

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  • Report No.: LBNL--50457
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 815476
  • Archival Resource Key: ark:/67531/metadc735559

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  • May 24, 2002

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  • Oct. 18, 2015, 6:40 p.m.

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  • April 1, 2016, 8:39 p.m.

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Urzua, Luis; Powell, Tom; Cumming, William B. & Dobson, Patrick. Apacheta, a new geothermal prospect in Northern Chile, article, May 24, 2002; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc735559/: accessed December 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.