United States customary units mass: tower, apothecaries', troy, avoirdupois, and metric. Of these, the avoirdupois weight is the most common system used in the U.S., although Troy weight is still used to weigh precious metals. Apothecaries weight—once used by pharmacies—has been largely replaced by metric measurements. Tower weight fell out of use in England (due to legal prohibition in 1527) centuries ago, and was never used in the U.S. The imperial system, which is still used for some measures in the United Kingdom and other Commonwealth countries, is based on avoirdupois, with variations from U.S. customary units larger than a pound. The pound avoirdupois,
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