Choir Depression

The Choir Depression is a depression near Choir, Mongolia. It is about 150 km long and 10 to 20 km wide, about 500 m lower than the surrounding upland.^[1] It lies at an altitude of 1269 m.

Uranium prospecting began in the Choir Depression in 1955, and the Haraat deposit (of uranium trioxide), identified in 1970, began major drilling in 1988.^[2] Following new discoveries in 1997, there is estimated to be 18 million pounds of uranium trioxide in the depression.^[3] In early 1994, the area was licensed to the Gurvan Saihan Joint Venture, with a 70% interest by Denison Mines, and 15% each from the Mongolian government and a Russian state geological concern.^[4][5] Rail lines connect the Trans-Mongolian Railway with the mine.

Notes

1. ^ Denison Mines (December 2006). "Annual Information Form" (pdf). p. 62. Archived from the original on 2007-09-28. http://web.archive.org/web/20070928122047/http://www.denisonmines.com/files/objects/2006+AIF+FINAL.pdf. Retrieved 2007-07-24. 
2. ^ International Uranium Corp (March 2000). "Annual and Transition Report". http://sec.edgar-online.com/2000/03/31/17/0001035704-00-000218/Section4.asp. Retrieved 2007-07-24. 
3. ^ "International Uranium Corporation Announces 1997 Exploration Results in Mongolia - New 10 Million Pound Uranium Deposit Delineated". 1998-02-18. http://www.thefreelibrary.com/International+Uranium+Corporation+Announces+1997+Exploration+Results...-a020301865. Retrieved 2007-09-25. 
4. ^ "Denison Announces NI 43-101 Resource Estimate on Hairhan Deposit in Mongolia". Yahoo! Finance. March 13, 2000. http://biz.yahoo.com/ccn/070313/200703130377729001.html?.v=1. Retrieved 2007-07-24. ^{[dead link]}
5. ^ "Exploration and Development: Mongolia". Denison Mines. Archived from the original on 2007-07-11. http://web.archive.org/web/20070711233347/http://www.denisonmines.com/content/exploration/Mongoliaexploration.cfm?catid=1281. Retrieved 2007-09-25.