The Pebble gold and copper mine would be an open pit mine (click here to see amazing images of open pit mines from space)–about two miles wide and several thousand feet deep. Most of the rock removed from the pit will be waste rock, which often contains acid-generating sulfides, arsenic, lead, mercury, and cyanide. Once the minerals are processed and recovered, the remaining rock becomes another form of mining waste called tailings, which also can contain up to three dozen dangerous chemicals.
The Pebble mine will discharge up to 10 billion tons of these toxic tailings that will need to be stored forever behind massive earthen dams. The largest of the dams containing these toxic slurry lakes would be over 700 feet tall and 4 miles long.
No comments:
Post a Comment