Options on Silver Wheaton (SLW, news, chart, volatility) remain actively traded. The March 2.5 and 5 calls saw massive increases in open interest after yesterday’s surge in activity: 13,155 and 20,266 contracts, respectively. Today, total volume is running twice the usual, as shares move up 35 cents to $3.48. The same two contracts are again leading the flow Wednesday, with 3,700 March 5s and 1,800 March 2.5s traded. There seems to be a mix of buying and selling, with some players possibly closing out trades from yesterday after the bump in the share price today.