| 词条 | Orapa diamond mine |
| 释义 |
| name = Orapa diamond mine | image = | width = | caption = | pushpin_map =Botswana | pushpin_label =Orapa diamond mine | pushpin_map_caption = Botswana | coordinates = {{coord|21|18|30|S|25|22|10|E|region:BW_scale:50000|format=dms|display=inline,title}} | place = Orapa | subdivision_type = | state/province = | country = Botswana | owner = Debswana | official website = www.debswana.com | acquisition year = | stock_exchange = | stock_code = | products = Diamonds (16.3 million carats in 2003) | financial year = | amount = | opening year = 1971 | closing year = }} The Orapa diamond mine is the world's largest diamond mine by area. The mine is located in Orapa, a town in the Central District of Botswana about {{convert|240|km|mi|sp=us}} west of the city of Francistown. Orapa ("resting place for lions") is owned by Debswana, a partnership between the De Beers company and the government of Botswana. It is the oldest of four mines operated by the company, having begun operations in July 1971. Orapa is an open pit style of mine and is the largest diamond mine in the world by area. The mine is located on two kimberlite pipes that converge near the surface, covering 1.18 square kilometres at ground level. Orapa operates seven days per week, and produces 20 million tons per year of ore and an additional 40 million tons per year of waste rock. Currently, the Orapa mine annually produces approximately 11 million carats (2200 kg) of diamonds.[1] The recoverable ore grade at the mine is about 0.87 carats (174 mg) per ton. The mine was expanded in 1999, doubling its previous capacity. The processing plant at Orapa processes the ore produced at Orapa as well as two of Debswana's three other mines, the Letlhakane and Damtshaa diamond mines. Orapa and its sister mine Letlhakane employ over 3,100. Debswana also maintains a 100-bed hospital, pre-primary and primary schools for employees' children, and the Orapa game park. The mine maintains an ISO 14001 certificate for environmental compliance, and places some importance on water conservation and waste management. References1. ^{{cite web|last1=Zimnisky|first1=Paul|accessdate=February 4, 2013|url=http://www.resourceinvestor.com/2013/01/22/the-state-of-2013-global-rough-diamond-supply|title=The state of 2013 global rough diamond supply|publisher=Resource Investor|date=January 22, 2013}}
4 : Diamond mines in Botswana|Surface mines in Botswana|Diatremes of Botswana|Pre-Holocene volcanoes |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。