Mining giant Rio Tinto PLC is willing to go to hell and back for copper. Its new mine near Superior, Arizona, bores nearly 7,000 feet below the Earth’s surface where temperatures routinely hit 175 degrees Fahrenheit.
from Forbes Real Time http://www.forbes.com/sites/jonmarkman/2017/07/14/these-are-the-robots-that-will-mine-in-hell/
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