Argentina has clinched a deal with labor unions and energy companies aimed at luring investors to the Vaca Muerta formation in Patagonia, one of the largest shale reserves in the world, the government said on Tuesday. Vaca Muerta has attracted investment from Chevron Corp and Exxon Mobil Corp. But the formation, which is about the size of Belgium, remains mostly unexplored, largely due to high production costs and a lack of labor flexibility, oil major executives have said. As part of the pact, Argentina will offer a subsidized price of $7.50 per million British thermal units of natural gas produced at new wells through 2020. The price, which is more than double that of front-month natural gas futures on the New York Mercantile Exchange, is […]