U. stell dir vor, das "Erdloch" wird in Zukunft noch viel grösser werden,u. wenn es als Tagebaumine nicht mehr tiefer geht beginnt das Undergroundmining ;-))))))))))))
"Open-pit mining of the Grasberg ore body began in 1990. Open-pit operations are expected to continue until mid-2015, at which time the Grasberg underground mining operations are scheduled to start. Grasberg is at the heart of a highly prospective minerals district, where ongoing exploration is providing opportunities to continue to add to long-lived reserves. Technologically, because of its remote and mountainous location, it has to be perhaps the world's most spectacular mining operations."
In May, BCL chairman Peter Taylor visited Bougainville with a business delegation and held preliminary discussions with Bougainville President John Morris about reopening the Panguna mine, which the company estimates has reserves of 3.5 million tonnes of copper and 12.7 million ounces of gold.
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