Troy weight them Holland troy, Paris troy, etc. Their values varied from one another by up to several percentage points. Troy weights were first used in England in the 15th century, and were made official for gold and silver in 1527. The British Imperial system of weights and measures (also known as Imperial units) was established in 1824, prior to which the troy weight system was a subset of pre-Imperial English units. The troy ounce in use today is essentially the same as the British Imperial troy ounce (1824–1971), adopted as an official weight standard for United States coinage by Act of
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