Disturbing Unanswered Questions for Costa Rica Crucitas Gold Mine Project

The January 8th, 2009 6.1-magnitude earthquake in northern central Costa Rica places the Crucitas gold mine project in a new light. Crucitas is located about 60 miles north of the earthquake’s epicenter so the Crucitas area was not impacted significantly. But could it have been? The Associated Press reported that the 82 mega-watt Cariblanco hydroelectric dam near San Jose was damaged in the earthquake and will be out of operation for one year. Bridges and highways were also destroyed. So it seems only reasonable to wonder how a tailings dam would hold up, especially considering how a release of a huge amount of toxic wastewater after an earthquake could grossly compound the environmental destruction wrought by it.
The Crucitas project outline calls for an open pit operation with a tailings pond for catching the water used in cynidation. Its tailings pond will have a dam crest 80 meters (260 ft.) high and 18 meters wide with some rock lining for erosion protection. Infomine.com’s project summary mentions no infrastructure measures for prevention of a tailings pond dam failure due to an earthquake, and possible aftershocks. The site’s project profile also provides no information about seismic activity in the region. However, the Observatorio Vulcanologico y Sismologico de Costa Rica website states that the area near the proposed gold mine is potentially dangerous: “Historically, the central region of Costa Rica has been very active seismically”.

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