* Shares soaring on drill results since November * Gains are in sharp contrast to most of industry * Uranium prices depressed since Japanese disaster * Alpha led by part of Hathor Exploration team By Rod Nickel TORONTO, March 4 (Reuters) - The last uranium company Ben Ainsworth worked for, Hathor Exploration, became the target of a bidding war that mining giant Rio Tinto PLC eventually won, and the geologist-turned mining executive thinks he may have struck it rich again.