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Jiama

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

Names and other identifiers

GMRAP ID 578
Tract name Gangdese (142pCu8712)
Site status deposit

Geographic location

Country China
State or province Xizang
Geographic location 91.764706, 29.70282
Geologic map unit 91.764706, 29.70282
Nearby data
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Geologic information

Deposit type Porphyry copper
Deposit subtype Cu-Mo
Age (Ma) 14.78Ma
Age determination method Re-Os molybdenite
Age range 14.78 ±0.33 Ma (Re-Os molybdenite); 14.2 ±0.2 Ma and 14.1 ±0.3 Ma (U-Pb zircon SHRIMP)
Age reference Tang and others (2010)
Minerals Ag-Bi galena, anglesite, biotite, bornite, chalcopyrite, chlorite, covellite, diopside, epidote, gold, garnet, hessite, limonite, malachite, molybdenite, pyrite, pyrrhotite, sericite, sphalerite, tetrahedrite, wollastonite
Associated rocks adamellite porphyry, felsic dike, hornfels, skarn, calcareous slate, reef limestone, sandstone, sandy slate
Tectonic setting postconvergence
Stratigraphic age Miocene

Commodity and development information

Development status Producer
Major commodities Cu, Mo, Ag
Tonnage (Mt) 1,006Mt
Cu grade (%) 0.39%
Mo grade (%) 0.046%
Au grade (g/t) 0.095g/t
Ag grade (g/t) 5.6g/t
Contained copper 3,900,000t
Gold-Moly ratio 2.1

Reference information

Comments Tibet. Gangdese porphyry copper belt. Newly discovered porphyry deposit underlies skarn/hornfels body. Resource for combined skarn and hornfels ore of 1.006 Bt at 0.39% Cu, 0.046% Mo, 0.095 g/t Au, and 5.6 g/t Ag; classed as deposit even though still open; porphyry copper, skarn-related? Mining.
Study area name Tibetan Plateau
References Deng and others (2009); Beaudoin and others (2005); Li, Rui and others (2005); Peng and others (2001); Qu and others (2007); Rui, Wang and Wang (2002b); Singer and others (2008); China Gold International (2010); Tang, Wang, Wang, and others (2010)
Site reference Ludington, Hammarstrom, and others (2012)
Beaudoin, G., Hébert, R., Wang, C.S., and Tang, J., 2005, Epithermal Au-Ag-Cu, porphyry Cu-(Au-Mo), and Cu-Au-Ag-Zn-Pb skarn deposits of the Gangdese arc, Tibet, chap. 11-1 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. 1219–1222. (Also available at http://dx.doi.org/10.1007/3-540-27946-6_311.)China Gold International, 2010, Jiama copper polymetallic project: China Gold International Resources Corp. Web page accessed January 2011, at http://www.chinagoldintl.com/s/Jiama.asp.
Deng, Qingping, Ingham, P.D., Lepetic, V.M., and Epps, J.M., 2009, Independent technical report on the Jiama copper-polymetallic project in Metrorkongka County, Tibet autonomous region, the People’s Republic of China: Behre Dolbear Asia Inc., 110 p. (Available for download at www.sedar.com/.)
Li Guang-ming, Rui Zong-yao, Wang Gao-ming, Lin Fang-cheng, Liu Bo, She Hong-quan, Feng Cheng-you, Qu Wen-jun, 2005, Molybdenite Re-Os dating of Jiama and Zhibula polymetallic copper deposits in Gangdese metallogenic belt of Tibet and its significance: Mineral Deposits, v. 24, no. 5, p. 481–489. [In Chinese, English abstract.] (Abstract also available at http://en.cnki.com.cn/Article_en/CJFDTotal-KCDZ200505002.htm.)Peng Yongming, Yao Peng,and Li Jingao, 2001, Upper Jurassic-Cretaceous sequence stratigraphy and mineralization in the Jiama copper-multi-metallic mining area of Tibet: Geological Review, v. 47, no. 6, p. 584–588. [In Chinese, English abstract.] (Abstract also available at http://en.cnki.com.cn/Article_en/CJFDTOTAL-DZLP200106006.htm.)Qu, Xiaoming; Hou, Zengqian; Zaw, Khin; and Li, Youguo, 2007, Characteristics and genesis of Gangdese porphyry copper deposits in the southern Tibetan Plateau—Preliminary geochemical and geochronological results: Ore Geology Reviews, v. 31, p. 205–223. (Also available at http://dx.doi.org/10.1016/j.oregeorev.2005.03.012.)
Rui, Z., Wang, L., and Wang, Y., 2002b, Porphyry copper deposit models in China, in Workshop on Assessing Undiscovered Mineral Resources, Beijing, June 24–28, Proceedings: China Geological Survey and U.S. Geological Survey, p. 42–52.
Singer, D.A., Berger, V.I., and Moring, B.C., 2008, Porphyry copper deposits of the world—Database and grade and tonnage models, 2008: U.S. Geological Survey Open-File Report 2008-1155, [45] p. and digital data, accessed December 31, 2013, at http://pubs.usgs.gov/of/2008/1155/.Tang Ju-xing, Wang Deng-hong, Wang Xiong-wu, Zhong Kang-hui, Ying Li-juan, Zheng Wen-bao, Li Feng-ji, Guo Na, Qin Zhi-peng, Yao Xiao-feng, Li Lei, Wang You, and Tang, Xiao-qian, 2010, Geological features and metallogenic model of the Jiama copper-polymetallic deposit in Tibet: Acta Geoscientica Sinica, v. 31, no. 4, p. 495–506. [In Chinese, English abstract.] (Abstract also available at http://en.cnki.com.cn/Article_en/CJFDTOTAL-DQXB201004002.htm.)