The pit in Butte/Anaconda ("The richest hill on earth"), MT is full of copper disolved in an acidic "lake." There have been reports stating that the amount of copper dissolved in the lake is equal to the amount that has been mined since the hill was found. Extracting the copper becomes the difficult part.
Slashdot Mirror
The pit in Butte/Anaconda ("The richest hill on earth"), MT is full of copper disolved in an acidic "lake." There have been reports stating that the amount of copper dissolved in the lake is equal to the amount that has been mined since the hill was found. Extracting the copper becomes the difficult part.