Ottawa clamps down on China's critical-minerals foray, but not prospecting

Open this photo in gallery: A worker walks underground at Goldcorp Inc’s Borden all-electric gold mine near Chapleau, Ontario in 2018.CHRIS WATTIE/Reuters Lone wolf Mike Tremblay is one of Canada's most successful mining prospectors. In the 1980s, he discovered the Borden Lake gold deposit in northern Ontario, which was subsequently developed into a mine. Over four decades, he's headed into the Ontario bush on countless occasions, amassed about 10,000 mining claims and knows better than anyone there's no guarantee of ever making a cent in the prospecting business. About a dozen years ago, Mr. Tremblay woke to find a good…