World Library  
Flag as Inappropriate
Email this Article

Letseng diamond mine

Article Id: WHEBN0007319138
Reproduction Date:

Title: Letseng diamond mine  
Author: World Heritage Encyclopedia
Language: English
Subject: Economy of Lesotho, Mokhotlong, List of largest rough diamonds, Geography of Lesotho, List of weather records
Collection: Diamond Mines in Lesotho, Economy of Lesotho
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Letseng diamond mine

Letseng diamond mine
Location
Letseng diamond mine is located in Lesotho
Letseng diamond mine
Country Lesotho
Coordinates
Production
Products diamonds
Type diamond

The Letseng diamond mine, found in the landlocked Southern African kingdom of Lesotho, is owned by Gem Diamonds, Ltd. and the government of Lesotho, and at an elevation of 3,100 m (10,000 ft) it is the world's highest diamond mine.

Contents

  • Production 1
  • Geography 2
    • Climate 2.1
  • Significant diamond finds 3
    • Lesotho Promise 3.1
    • Lesotho Brown 3.2
    • Letseng Legacy (September 2007) 3.3
    • Star of Lesotho 3.4
    • Leseli La Letšeng (September 2008) 3.5
  • November 2010 4
  • See also 5
  • References 6

Production

It is characterised by extremely low grade ore (less than 2 carats (400 mg)/hundred tons) and is well known for producing huge diamonds, having the highest percentage of large diamonds (greater than 10 carats (2.0 g)), giving it the highest dollar value per carat of any diamond mine. The world average is roughly US$81 per carat, while Letseng averaged over US$1,894 per carat for the first six months of 2007.[1]

Unusual for Africa, and due to the elevation, temperatures at the mine drop to -20 °C, and snowfalls are common in winter.

Geography

Climate

Letseng has a tundra climate (ET, according to the Köppen climate classification), with an average annual precipitation of 881 mm (35 in). This climate has chilly to cold temperatures throughout the year, with snowfalls.

Climate data for Letseng-la-Terae
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Average high °C (°F) 14.8
(58.6)
14.5
(58.1)
12.2
(54)
10.6
(51.1)
7.7
(45.9)
5.4
(41.7)
5.4
(41.7)
6.8
(44.2)
9.9
(49.8)
11.2
(52.2)
12.6
(54.7)
13.7
(56.7)
10.4
(50.73)
Daily mean °C (°F) 9.8
(49.6)
9.7
(49.5)
7.7
(45.9)
5.1
(41.2)
2.0
(35.6)
−0.1
(31.8)
0.0
(32)
1.5
(34.7)
4.6
(40.3)
6.0
(42.8)
7.5
(45.5)
8.9
(48)
5.23
(41.41)
Average low °C (°F) 4.8
(40.6)
4.9
(40.8)
3.3
(37.9)
−0.3
(31.5)
−3.6
(25.5)
−5.5
(22.1)
−5.3
(22.5)
−3.8
(25.2)
−0.6
(30.9)
0.8
(33.4)
2.5
(36.5)
4.1
(39.4)
0.11
(32.19)
Average precipitation mm (inches) 133
(5.24)
119
(4.69)
120
(4.72)
67
(2.64)
20
(0.79)
10
(0.39)
8
(0.31)
24
(0.94)
57
(2.24)
89
(3.5)
115
(4.53)
119
(4.69)
881
(34.68)
Source: Climate-data.org[2]

Significant diamond finds

Lesotho Promise

On the 4th of October 2006 the 603 carat (121 g) white diamond, the Lesotho Promise was unearthed, and is the largest reported find this century and the 15th largest diamond ever found. The stone is an exceptional colour, rated D, the top colour for diamonds.

Lesotho Brown

Previously the largest diamond found at Letseng was the 601 carat (120 g) Lesotho Brown, recovered in 1967.

Letseng Legacy (September 2007)

On September 13, 2007 Gem Diamonds, Ltd. announced that it found a 493 carats (98.6 g) diamond, making it the 18th largest diamond ever found. It was sold to the Graff-SAFDICO partnership for $10 million.[1]

Star of Lesotho

In 2004, Gem Diamonds, Ltd. found a large diamond of 123 carats (24.6 g).[3]

Leseli La Letšeng (September 2008)

On September 21, 2008 Gem Diamonds, Ltd. announced that it found a 478 carats (95.6 g) diamond of high quality, making it the 20th largest diamond ever found. It is a type II D colour, with potential to yield a 150 carats (30 g) cut stone. Chief executive Clifford Elphick said: "Preliminary examination of this remarkable diamond indicates it will yield a record-breaking polished stone of the very best colour and clarity, and has no inclusions visible in its rough form."[4][5] [6]

November 2010

The discovery of two large rough white diamonds was announced in November 2010.[7] They weighed 196ct and 184ct.[8]

See also

References

  1. ^ a b "Big diamond discovery in Africa". Finance 24. Fin24.com. 2007-09-13. Retrieved 13 September 2007. 
  2. ^ "Climate: Letseng-la-Terae". Retrieved 26 April 2015. 
  3. ^ "Star of Lesotho". Retrieved 14 April 2008. 
  4. ^ menafn.com, World's 20th largest rough diamond found in Lesotho
  5. ^ news.bbc.co.uk, Massive diamond found in Lesotho
  6. ^ "Lesotho mine yields one of world's largest diamonds". Retrieved 21 September 2008. 
  7. ^ "Mining Journal - Gem recovers another large diamond from Letseng". Retrieved 2010-11-10. 
  8. ^ "Mining Journal - Gem sells diamonds for US$22.7 million". Retrieved 2010-11-28. 
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.