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According to the Mineral Commodity Summaries in 1999, in 1997 the world's annual production of natural diamonds was 57.70 million carats. The countries that ranked the first five places in the world's production were Australia, Congo (Kinshasa), Russia, South Africa and Botswana in succession. In 1997 China's annual natural diamond production was 120,400 carats.

Diamond mining in China is relatively weak and develops slowly in recent years. The diamond mines are grouped into primary diamond mines and placer diamond mines. According to the incomplete statistics, in 1996 there were eight diamond mines, of which three were state-owned primary diamond mines (mainly the Shandong No. 701 mine, Mengyin, Shandong, and the mine owned by the Wafangdian Diamond Co. of Liaoning) and five were town and township mines (mainly placer diamond deposits mined by local people in Hunan and Shandong). The designed diamond mine capacity is specified as follows: the mining capacity is 366,200 tons of ore per year and the dressing capacity is 330,000 tons of ore per year. Only state-owned mines have production scale. The Dingjiagang placer diamond mine at Changde, Hunan, has stopped production; town and township mines are not constructed regularly and have no definite production scale. Influenced by the variation in diamond grade, the diamond production fluctuates greatly. In the 1990s China generally produced 100,000 to 150,000 carats of diamond each year. The annual production of natural diamonds of China in recent years is shown in Table 4.12.2.Henan Hongxing Mining Machinery Co., Ltd is the professional manufacturer of complete sets of mining machinery, for example,sand washing machine,rotary kiln Welcome all of you to visit our official website.china impact crusher:http://www.hxjq-crusher.com/2.html

Table 4.12.2 Production of natural diamonds of China

As the production of natural diamonds is very limited and falls far short of the demand of the national economy, more than 90% of industrial diamonds are replaced by synthetic diamonds. At present there are more than 600 synthetic diamond plants in China, which produce over 400 million carats of single diamond crystals each year. The production of China's synthetic diamonds can satisfy the demands for the manufacture of diamond tools, and they have become an important component part of the ultrahard material industry. In terms of quantity China has been the largest producer of synthetic diamonds.Henan 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.