shares of wheaton precious metals corp wpm slipped 312 to c5681 wednesday in what proved to be an allaround down trading session for the canadian market with the sptsx composite index gsptse falling 050 to 2010389 wheaton precious metals corp closed c1458 below its 52week high c7139 which the company achieved on may 4th trading volume of 844333 shares eclipsed its 50day average volume of 765222