Yaogangxian Mine, Yizhang Co., Chenzhou Prefecture, Hunan Province, China

Vein-type orebodies, hosted in Cambrian to Jurassic strata and Mesozoic granitic intrusions. Ferberite of the wolframite series and molybdenite are the dominant ore minerals. The deposit is mined since 1914.
Located about 40 km SE of Chenzhou. Originally said to be near Hengyang, about 180 km further north-northwest. Operated commercially as a tungsten mine, it has recently been a prolific source of specimens including fluorite, ferberite, bournonite, arsenopyrite, etc.

NOTES:
(1) All fibrous sulphosalts are notoriously traded by Chinese dealers as "bismuthinite", but are mostly stibnite, or, possibly, boulangerite or jamesonite. According to Jensen (2009), bismuthinite and galenobismutite, both listed in earlier reports, were never confirmed in a very large number of analyses. Saul Krotki (personal communication, October 10, 2009) had a "bismuthinite" from this locality analyzed by semiquantitative microprobe by CannonMicroprobe and the composition was very bismuthian and ambiguously stibnite/bismuthinite.
(2) The "Wolframite" is predominantly Ferberite. To date, Hübnerite was only found in one single pocket.
(3) Beryl is listed from the mine, but decent specimens are not known. In particular, the "Goshenites" sold by some dealers do not come from the Yaogangxian mine, but actually from Pingwu, Sichuan Province.

References:
- Ottens, B. and Cook, R.B. (2005): The Yaogangxian tungsten mine, Yizhang County, Chenzhou, Hunan Province, China. Rocks & Minerals: 80(1), 46-57.
- Jiantang Peng, Meifu Zhou, Ruizhong Hu, Nengping Shen, Shunda Yuan, Xianwu Bi, Andao Du, and Wenjun Qu (2006): Precise molybdenite Re–Os and mica Ar–Ar dating of the Mesozoic Yaogangxian tungsten deposit, central Nanling district, South China. Mineralium Deposita 41, 661-669.
- Jensen, M. (2009): Mineralogy of the Yaogangxian Mine, Hunan Province, China. Mineral News 25(4), 1-11 & 14.