A 27-year-old man was killed last week when he was attacked by a black bear at a remote uranium mining site in northern Saskatchewan, in what officials said was only the fourth fatal black bear attack in the Canadian province’s recorded history. Provincial officials said the man, whose name has not been released, was attacked Friday about 50 miles northeast of Points North Landing, one of the northernmost points for trucking and airfreight services for northern Saskatchewan, the Northwest Territories and Nunavut. The man was working as a contractor for the UraniumX Discovery Corp., an exploration company working in the Athabasca Basin. The area, which straddles the border with Alberta and reaches toward the Northwest Territories, is home to some of the world’s largest known uranium deposits. Canada is one of the world’s largest producers and exporters of uranium, a naturally occurring radioactive element that is used to fuel commercial nuclear reactors.…