SANTIAGO – Chilean authorities began an investigation on Monday into a strange sinkhole measuring 25 meters (82 feet) in diameter that appeared over the weekend in a mining area in the country's north. Aerial photographs of the sinkhole on territory operated by a Canadian Lundin Mining copper mine, around 665 kilometers (413 miles) north of Santiago, were released by Chilean … [Read more...] about Chilean Authorities are Looking into a Suspicious Big Sinkhole Near a Copper Mine