Apacheta, A New Geothermal Prospect In Northern Chile

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Conference Paper: Apacheta, A New Geothermal Prospect In Northern Chile

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°C steam well and the 109" and 1 18°C fumaroles with gas compositions that indicate reservoir temperatures of 225OoC, using a variety of gas geothermometers. An MT-TDEM survey was completed in 2001 -2002 by Geotdrmica del Norte (SDN), an ENAP-CODELCO 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

Luis Urzua, Tom Powell, William B. Cumming and Patrick Dobson

GRC, 2002

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Luis Urzua,Tom Powell,William B. Cumming,Patrick Dobson. 2002. Apacheta, A New Geothermal Prospect In Northern Chile. In: (!) ; (!) ; (!) . (!) : GRC; p. (!)