PolyMet Mining Corp. (NYSE:PLM) was the recipient of a large growth in short interest during the month of August. As of August 31st, there was short interest totalling 3,371,378 shares, a growth of 2.1% from the August 14th total of 3,302,118 shares, MarketBeat.Com reports. Approximately 1.8% of the shares of the stock are sold short. […]