the gold report interviewed brent cook, and this is what he had to say about silver:

TGR: What about silver plays?

BC: The one company is in our portfolio with a bona fide silver deposit is MAG Silver Corp. (TSX:MAG) (NYSE:MVG). I like it because it has a high-grade, high-margin deposit, and those are very few and far between. Most silver companies, I hate to say, are mining or exploring marginal deposits. They go into an old mining district or camp in Mexico or Peru, come into something that's probably been mined off and on for centuries and hope to make money on what the Mexicans missed. On the whole, these deposits average about 250 grams of silver with a bit of gold and that's just barely above what it actually takes to drill it out, develop it and mine it. So it's hard to find good high-grade high-margin deposits such as MAG Silver's. In terms of deposit, that is the best silver deposit out there.

http://www.theaureport.com/pub/na/2894