As oil fields become depleted, what remains is a brine that, until recently, was treated as a waste product which had to be carefully managed according to ever more strict environmental regulations. However, what seemed to be trash has turned into treasure, as this brine in select areas contains high amounts of lithium, a commodity highly sought-after by battery makers. Some of the richest of these deposits lie in one of Canada’s most venerable petroleum finds, the Leduc reservoir between Edmonton and Calgary, which was first drilled in the 1940s.
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