Porphyry copper (Cu-Au) deposit in Xizang, China

Names and other identifiers

Alternate names part of Xietongmen district
Tract name Gangdese (142pCu8712)
Group name Xietongmen-Newtongmen
Included sites Newtongmen, Dongga
Site status deposit

Geographic location

Country China
State or province Xizang
Geographic location 88.430061, 29.362876
Geologic map unit 88.430061, 29.362876
Nearby data

Geologic information

Deposit type Porphyry copper
Deposit subtype Cu-Au
Age (Ma) 174.2Ma
Age determination method Re-Os molybdenite
Age range 174.2 ±0.2 Ma (Re-Os molybdenite); 173.0 ±0.9 Ma, 171.7 ±1.2 Ma and 171.3 ±1.0 Ma, 172.4 ±2.0 Ma and 173.5 ±1.0 Ma (U-Pb zircon LA-ICP-MS)
Age reference Tafti and others (2009); Xu and others (2009); Rui, Wang and Zhang (2005)
Tectonic setting postconvergence
Stratigraphic age Middle Jurassic

Commodity and development information

Development status Prospect
Major commodities Cu, Au
Minor commodities Mo
Tonnage (Mt) 1,085Mt
Cu grade (%) 0.3%
Au grade (g/t) 0.22g/t
Ag grade (g/t) 1.2g/t
Contained copper 3,300,000t
Gold-Moly ratio -9999

Reference information

Comments Tibet. Gangdese porphyry copper belt. Xietongmen ready for exploitation; Newtongmen large, but lower grade; mining future uncertain since purchase by Jinchuan Group in 2010; may be Jurassic and may belong to Gangdese_Tethyan tract 142pCu8706. Combined resource is 1,047,300,000 t at 0.303% Cu, 0.212 g/t Au, and 1.12 g/t Ag; no reported Mo; classed as deposit even though still open. Development.
Study area name Tibetan Plateau
References Rebagliati and others (2009); Rebagliati and others (2007); Xu and others (2009); Rui, Wang and Zhang (2005); Tafti and others (2009)
Site reference Ludington, Hammarstrom, and others (2012)
Rebagliati, C.M., Lang, J.R., and Chisholm, I.R., 2007, Summary report on the 2006 exploration program at the Xietongmen property: accessed January 2011. (Available for download at www.sedar.com.)
Rebagliati, C.M., Lang, J.R., Titley, E.D., Melis, Lawrence, Chisholm, I.R., Mosher, Greg, and Copeland, D.J., 2009, Technical report on the 2007 and 2008 exploration programs—Xietongmen property: accessed January 2011. (Available for download at www.sedar.com.)
Rui, Z.-Y., Wang, L.-S., and Zhang, L.-S., 2005, Porphyry copper belts in Tibet, chap. 11-12 of Mao, Jingwen, and Bierlein, F.P., eds., Mineral Deposit Research—Meeting the Global Challenge: Springer, Society for Geology Applied to Mineral Deposits (SAG) Biennial Meeting, 8th, Beijing, August 18–21, 2005 [Proceedings], v. 1, p. 1263–1265. (Also available at http://dx.doi.org/10.1007/3-540-27946-6_322.)Tafti, Reza; Mortensen, J.K.; Lang, J.R.; Rebagliati, Mark; and Oliver, J.L., 2009, Jurassic U-Pb and Re-Os ages for the newly discovered Xietongmen Cu-Au porphyry district, Tibet, PRC—Implications for metallogenic epochs in the southern Gangdese belt: Economic Geology, v. 104, p. 127–136. (Also available at http://dx.doi.org/10.2113/gsecongeo.104.1.127.)Xu, Wenyi; Pan, Fengchu; Qu, Xiaomin;, Hou, Zengqian; Yang, Zhusen; Chen, Weishi; Yang, Dan; and Cui, Yanhe, 2009, Xiongcun, Tibet—A telescoped system of veinlet-disseminated Cu (Au) mineralization and late vein-style Au (Ag)-polymetallic mineralization in a continental collision zone: Ore Geology Reviews, v. 36, p. 174–193. (Also available at http://dx.doi.org/10.1016/j.oregeorev.2009.04.004.)