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
Silvercorp Metals for fraud, e.g. regarding the reported amount of silver produced. As reaction of detecting the fraud Mr. Huang was convicted and imprisoned in China for his investigation. After release Mr Huang pressed charges against Silvercorp in Canada for false imprisonment. Silvercorp Metals Silvercorp Metals Inc. (Silvercorp) is a Canadian-based, China focused precious metals company engaged in the acquisition, exploration, and development of silver containing properties. It is China's largest primary silver producer. The company is publicly traded on the Toronto Stock Exchange in Canada and the NYSE in the U.S. Silvercorp Metals operates four silver/lead/zinc mines in an area encompassing