CANADA STOCKS-TSX ekes out gain as Potash, banks rise; gold miners slip

(Updates to late morning trading) By Alastair Sharp TORONTO, April 24 (Reuters) - Canada's main stock index rose slightly on Thursday, as gains in Potash Corp following better-than-expected results and in some heavyweight banks were offset by declines in gold miners. Potash shares rose 1.3 percent to C$38.85 after the world's biggest fertilizer company beat profit expectations in a tough quarter. But that gain was mitigated by slips in major gold miners Barrick Gold - off 0.7 pe