timeline of mining towns in s montana
Montana History Timeline: Montana Important Dates and . 1982 - Copper-mining operations cease at Butte's Berkeley Pit. 1986-Limited underground mining resumes in Butte; Some high-tech gold mining reopens in Montana mountains; 1987-Burlington Northern sells a major portion of its Montana trackage to Montana Rail Link; Last gaps in federal interstate-highway system are completed in Montana; 1988-