 If done without environmental or health over-sight, conventional mining for uranium can produce large amounts of mining tailings and contaminated water but as of 2010, about half of the world's uranium supply is increasingly generated from In situ recovery (ISR) technology, that does not require physical mining in the conventional sense and if responsibly operated is considerably cleaner.Another alternative to ISR is remote controlled underground mining, the French owned Areva Resources Canada owns a large stake in the Canadian McArthur River uranium mine, the world's highest grade and largest uranium mine by output, the underground remote operation of mining vehicles in this mine, is designed to keep personnel exposure to rock particulates and radon gas etc.low.