Silver Wheaton ( SLW) is a mining company, which generates its revenue primarily from the sale of silver. Its current market cap is $16.23 billion, and the stock is up sharply so far in 2011 by around 17%. The trade here is pretty simple. Silver Wheaton is approaching a major breakout if it can manage to trade above $46 to $46.34 a share. Volume on Tuesday was already looking great as the stock approached those past overhead resistance levels. Over 17.2 million shares traded, which is well above the three-month average trading volume of 13.9 million shares. That was the highest volume up day since 17.3 million shares changed hands on March 16. Related: 6 Silver Stocks Analysts Like for 2011 Traders should now watch SLW to see if it can break out on heavy volume that's well above 13.9 million. If that does happen, it will mean the stock is trading at brand new all-time highs. It will also mean that pretty much anyone who has ever bought the stock is making money. This is good company to be in and it increases the probability that the stock will continue to trend higher for quite some time. If you buy this breakout, you can simply bail on the trade if it doesn't hold above those resistance levels I mentioned above. Or you can just give it a few points from the breakout area and dump the stock if it falls by around that amount.