It's a little-known fact that most silver is produced as a by-product of something else -- meaning the people who mine it don't actually want it. As a "silver-streaming" company, Silver Wheaton enters into silver-purchase agreements with miners where the company contracts to buy all or part of the mined silver. To date the company has signed 14 long-term silver-purchase agreements at roughly $4 an ounce. It's that simple - buy low, sell high. Silver Wheaton posted record sales and revenues in the first and second quarters and says it is on track for its "best year ever." -- Niamh Sweeney, contributor