Silver Wheaton has upside potential to as high as 10.22 on the next thrust. Let’s try to leverage this possibility by legging into some calendar spreads at the $10 strike. As long as the stock is trading $8 or higher, bid 0.74 for four September 10 calls (SLWIB), good through Friday. _______ UPDATE (12:20 p.m.):  The stock opened below $8 and has weakened since, so let’s lower our bid to 0.60 and leave it in for the remainder of the day.