Low grade of ore
The average ore grade of placer diamond deposits of China ranges from 4 to 8 mg/m3, and only the ore of the Toudaogou placer deposit at Wafangdian City, Liaoning Province, reaches an average grade 14.6 to 16.5 mg/m3. The ore grade of primary diamond deposits is higher in occurrences of Shandong than in occurrences of Liaoning. The average ore grades of diamond occurrences at Mengyin, Shandong, are 53.57 to 672.313 mg/m3; among these occurrences the Wangcun diamond deposit has the highest average grade of ore. The average ore grades of primary diamond occurrences at Wafangdian, Liaoning, are in the range of 29.8 to 462 mg/m3, with the ore of pipe No. 68 of Toudaogou having the highest grade.
Good quality of ore
Diamond products of China are generally good in quality. Especially diamonds produced in Liaoning are of excellent quality. According to the statistics of the geological grade, gem diamonds take up only 30%, but according to the statistics of the annual production, gem diamonds may account for over 70% of the annual production. Among the diamond products of Shandong Province, gem diamonds make up about 15 to 20%. The content and granularity of gem diamonds from placer diamond deposits are notably higher than those from primary diamond deposits. Gem diamonds from placer deposits in Hunan, Liaoning and Shandong account for 60%, 50% and 30% of the total production respectively, but famous large-grained diamonds are mostly found in Shandong, and the crystals are relatively intact.Henan Hongxing Mining Machinery Co., Ltd is the professional manufacturer of complete sets of mining machinery, for example,cement plant,mobile crushers Welcome all of you to visit our official website.artificial sand maker:http://www.hxjqchina.com/product-list_57.htmlHenan Hongxing Mining Machinery Co., Ltd is a joint-stock mining machinery manufacturing enterprise integrated in scientific research, production and marketing. It is located at the High & New Technology Industries Development Zone of Zhengzhou,China with an area of 50 thousand m2 which includes 15,000 m2 of standard heavy duty industrial workshop. Equipments are more than 160 pieces, including large and medium sized metal processing, riveting and installing equipments. There are more than 660 workers including 80 administrators with secondary and senior occupational titles and engineering technicians. In order to promote the competitive strength, the advanced technologies have been introduced from America, Germany, Japan and Australia, which established the international advanced production line, first-class modern testing base as well as research centers of sand maker, mill and mine-selecting equipment. Scientific management, advanced processing technology and innovative manufacturing theory make the company become the mining machinery manufacturing and exporting base in China.
II-type diamonds occupy a certain proportion in diamond deposits of China. Preliminary analysis of diamond samples from part of diamond orebodies gave the following results: the content of II-type diamonds from the Shengli No. 1 pipe in the Wangcun deposit, Mengyin County, Shandong Province, is 18.67% of the total diamond samples weight, of which the IIb type makes up 24.67% of the II type; the content of II-type diamonds from orebody Nos. 50, 51, 68 and 74 in the Toudaogou deposit, Wafangdian, Liaoning, is 3.86% of the total weight, of which the IIb type takes up 5% of the II type; the content of II-type diamonds from the Dingjiagang placer deposit, Changde, Hunan, is 2.6% of the total sample weight, all the diamonds being of IIa type.
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