System of measurement The same is true of quarts, gallons, etc. Six US gallons are a little less than five imperial gallons. The Avoirdupois system served as the general system of mass and weight. In addition to this there are the Troy and the Apothecaries' systems. Troy weight was customarily used for precious metals, black powder and gemstones. The troy ounce is the only unit of the system in current use; it is used for precious metals. Although the troy ounce is larger than its Avoirdupois equivalent, the pound is smaller. The obsolete troy pound was divided into 12 ounces, rather than the
Wheaton Precious Metals Corporation 2017 Silver Wheaton reported attributable production totaling 6.5 million ounces of silver and 84,900 ounces of gold, equal to 12.5 million silver equivalent ounces. The Company reported net earnings for the quarter of $61 million or $0.14 per share. On May 10, 2017, Silver Wheaton says shareholders approved a company name change to Wheaton Precious Metals, effective immediately. Silver Wheaton was established in 2004. It was previously controlled by Goldcorp until December 7, 2006 when Goldcorp's sale of 18 million shares reduced its ownership to 48%. On February 14, 2008 Goldcorp divested itself completely of Silver Wheaton, selling 108 million