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Woxi Mines (Wuxi Mines; Xiangxi Mines; Xianxi Mines), Yuanling Co., Huaihua Prefecture, Hunan Province, China

Latitude: 28°32'N
Longitude: 110°52'E
沃溪锑钨金矿(湘西锑钨金矿), 沅陵县, 怀化市, 湖南省, 中国

The Woxi deposit was discovered in 1875 and since then has been continuously exploited. Reserves amount to 1.76 million tons of ore, grading at 12.98 g/t Au, 6.45% Sb and 0.47% WO3. Currently, about 800 tons of ore is mined and processed per day. There are several mines in the area, including Hongyanxi, Lijiaxi, Shangwoxi (Upper Woxi), Shilupenggong, Sujiaxi, and Yuershan.

Country rocks are Proterozoic low-grade metamorphic rocks, comprising the Lengjiaxi group (base) with sandy, greyish green slates and locally phyllites, and the Banxi group (top), consisting of (a) the Madiyi Formation of red slates, locally interbedded with sandy rocks and sandstones, and (b) the Wuqiangxi Formation of sandy, greyish green slates, arkoses and sandstones. The Madiyi Formation is a very important host unit for gold deposits in northwestern Hunan. The mineralization is controlled by the E-W striking Woxi thrust fault and by anticlines and synclines. At the fault, the older Madiyi Formation dips below the younger Wuqiangxi Formation. To the southwest, the Lengjiaxi Group is disconformably overlain by the Madiyi Formation. The stratabound orebodies occur in red slates of the Madiyi Formation and may be associated with a magmatic intrusion.


Notes:
(1) Xiangxi (sometimes erroneously spelled Xianxi) is a misnomer. This term generally refers to Western Hunan Province. Papers on a "Xiangxi Sb-W-Au deposit" are in fact mostly dealing with the Woxi deposit, but this is not necessarily the case.
(2) Papers variously refer to the locality as a deposit or an ore field.
(3) The grid reference is centered on the area.

Mineral List

Albite
Ankerite
Antimony
'Apatite'
Aragonite
Arsenopyrite
Aurostibite
Azurite
Baryte
Bornite
Boulangerite
Bournonite
Calcite
Cervantite
Chalcocite
Chalcopyrite
'Chlorite Group'
Cinnabar
Covellite
Cuprite
Dolomite
var: Ferroan Dolomite
Ferberite
Galena
Gersdorffite
Goethite
Gold
Graphite
Kaolinite
Lepidocrocite
'Limonite'
Malachite
Melanterite
Metacinnabar
Muscovite
var: Illite
var: Sericite
Pyrite
var: Arsenian Pyrite
Pyrophyllite
Quartz
var: Milky Quartz
Quartz
var: Rock Crystal

'Roméite Group
var: Stibiconite'

Scheelite
Sénarmontite
Siderite
Sphalerite
Stannite
Stibnite
Tetrahedrite
'Tourmaline'
Tungstite
Valentinite


54 entries listed. 43 valid minerals.

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References

Xianlin Luo, Congzheng Ceng, Chuanshu Mou, and Jiahui Xie (1976): Application and effects of primary halo measurements in the Xiangxi Au-Sb-W deposit. Geology and Prospecting 12(3), 41-48 (in Chinese).

Yongfu Kang (1984): Stratabound tungsten deposits in South China. Geology and Prospecting 20(6), 1-10 (in Chinese).

Ligang Zhang (1985): Stable isotope geology of Sb-W-Au deposits in the Xuefengshan uplift area, Western Hunan Province. Geology and Prospecting 21(11), 24-28 (in Chinese).

Zhengxiang Bao (1988): Occurrence features, metallogenesis and exploration guide of a stratabound scheelite deposit in western Hunan. Geology and Prospecting 24(3), 15-20 (in Chinese).

Boyi Liang and Zhenru Zhang (1988): A geneto-mineralogical study of main minerals from the Woxi Au-Sb-W deposit, western Hunan. Geology and Prospecting 24(8), 25-30 (in Chinese with English abstract).

Jianyan Li (1989): Geological features of the Woxi Au-Sb-W ore deposit. Geology and Prospecting 25(12), 1-7 (in Chinese).

Zhenxiang Bao (1990): Geological features and exploration guides of the W-Sb-As-Au deposits in western Hunan Province. Geology and Prospecting 26(2), 17-23 (in Chinese with English abstract).

Changjin Cai (1993): A preliminary study on several gold minerals in the Dongping and other gold deposits. Acta Mineralogica Sinica 13(1), 65-71 (in Chinese with English abstract).

Ying Li (1996): Geochemistry of Strata-Bound Tungsten Deposits. In: Tu Guangzhi (ed.): "Geochemistry of Strata-Bound Deposits in China", Science Press (Beijing), 549-564.

Xiongwei Hu, Satoshi Murao, and Xuchang Huang (1996): Genetic model of gold-antimony-tungsten mineralization: evidence from geology and mineralization of the Wuxi deposit, Hunan, China. Bulletin of the Geological Survey of Japan 47(11), 577-597.

Sixue Yang, Blum, N., Rahders, E., and Zhenru Zhang (1998): The nature of invisible gold in sulfides from the Xiangxi Au-Sb-W ore deposit in Northwestern Hunan, People's Republic of China. Canadian Mineralogist 36, 1361-1372.

Yang, S.X., and Blum, N. (1999): Arsenic as an indicator element for gold exploration in the region of the Xiangxi Au-Sb-W deposit, NW Hunan, PR China. Journal of Geochemical Exploration 66(3), 441-456.

Schulz, O., Vavtar, F., and Xuexiang Gu (2002): Stratiforme Sb-W-Au-Lagerstätte Woxi in Hunan, China. Erzmetall 55(10), 547-552 (in German with English anstract).

Xuexiang Gu, Schulz, O., Vavtar, Fr., Jianming Liu, and Minghua Zheng (2003): Ore fabric characteristics of Woxi W-Sb-Au deposit in Hunan and their genetic significance. Mineral Deposits 22(1), 107-120 (in Chinese with English abstract).

Bo Peng, Guanghao Chen, and Piestrzynski, A. (2003): Ore mineralogy of stibnite ore-veins and its genetic implications for the W-Sb-Au ore deposit at Woxi, Western Hunan, China. Acta Mineralogica Sinica 23(1), 82-90.

Bo Peng and Frei, R. (2004): Nd-Sr-Pb isotopic constraints on metal and fluid sources in W-Sb-Au mineralization at Woxi and Liaojiaping (Western Hunan, China). Mineralium Deposita 39, 313-327.

Bo Peng, Piestrzynski, A., Liu Shengyou, and Pieczonka, J. (2007): Gold-antimony mineral phases observed in pyrite grains in the Woxi W-Sb-Au deposit, western Hunan, China. Geological Bulletin of China 26(5).

Xuexiang Gu, Schulz, O., Vavtar, F., Jianming Liu, Minghua Zheng, and Shaohong Fu (2007): Rare earth element geochemistry of the Woxi W-Sb-Au deposit, Hunan Province, South China. Ore Geology Reviews 31(1-4), 319-336.

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