By Ruhi Soni (Reuters) -The Biden administration made a revised proposal on Wednesday to ban the disposal of mining waste in Alaska’s Bristol Bay watershed, dealing a potential death blow to the contentious Pebble Mine project that has been pursued for over a decade. The project, one of the world’s largest copper and gold deposits, has been through a roller coaster of regulations for the past 15 years as Bristol Bay’s salmon has supported important wildlife and a multibillion-dollar industry. The U.S. Environmental Protection Agency (EPA) said in a statement it is seeking public comments on th…