A worker from El Teniente copper mine points at a graphic which shows the seismic activity inside the mine near to Rancagua city, some 87 km (57 miles) south of Santiago April 1, 2010. El Teniente, which produces around 400,000 tonnes of copper per year, was not damaged by the 8.8 magnitude earthquake on February 27 that killed hundreds, mangled roads and hit the forestry and fishing industry. Chile state-run Codelco has spend millions of dollars in the last 5 years to reinforce mining infrastructure and prevent major damage from quakes in the tremor-prone country that produces a third of the world's mined copper. Picture taken April 1, 2010. REUTERS/Ivan Alvarado (CHILE - Tags: DISASTER ENVIRONMENT BUSINESS)