Word: adition
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Dates: during 1990-1999
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...Butte's chief exploration geologist, does a good job of guiding skeptical visitors around the mine site, explaining the care with which crews have been contouring and reseeding -- "mitigating" is the word -- old mine wreckage. Orange-stained, acidic water, the beginning of Fisher Creek, flows out of an old adit (mine entrance), but Kirk says large-scale plugging with cement and waste rock will prevent such seepage from dribbling out of Henderson's far side and downstream to Yellowstone. Will this work in a watery, fractured mountain? "There are risks in all human activity," says Kirk...
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