The stock of Wheaton Precious Metals ( WPM ) has more than doubled over the past year, significantly outperforming the price of gold ( GLD ) but lagging the price of silver ( SLV ) (see chart below). The result is thatMichael Fitzsimmons is a retired electronics engineer and avid investor. He advises investors to construct a well-diversified portfolio built on a core foundation of a high-quality low-cost S&P500 fund. For investors who can tolerate short-term risks, he advises an over-weight position in the ...