Aug 11 (Reuters) - Canada’s main stock index opened higher on Wednesday as optimism over a series of strong earnings reports and higher gold prices boosted the outlook for regional equities. * At 9:30 a.m. ET (13:30 GMT), the Toronto Stock Exchange’s S&P/TSX composite index was up 34.27 points, or 0.17%, at 20,530.01. Reporting by Ambar Warrick; Editing by Subhranshu Sahu Our Standards: The Thomson Reuters Trust Principles.