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Huanggang Fe-Sn deposit (Huanggangliang Mine; Huanggang Mine), Hexigten Banner (Keshiketeng Co.), Ulanhad League (Chifeng Prefecture), Inner Mongolia Autonomous Region, China

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Location is approximate, estimate based on other nearby localities.
Latitude & Longitude: 43° North , 117° East (est.)
Margin of Error:~108km
Name(s) in local language(s):黄岗锡铁矿床 (黄岗梁锡铁矿床), 克什克腾旗, 赤峰市, 内蒙古自治区, 中国

Skarn-type tin-iron deposit, occurring in the contact zone between carbonate rocks of the Early Permian Dashizai and Huanggangliang formations and two Cretaceous orthoclase granite intrusions (K-Ar isotopic age: 67-115 Ma), one in the western part of the area and one in its eastern part. At the contact, garnet diopside skarn and garnet amphibole biotite skarn are intensively developed. The ore minerals occur in masses, breccias, veinlets, and disseminations. Farther away from the contact, small veins occur in intraformational fissures in the skarn bodies. Late-stage sulphide minerals, amphibole, and epidote replace the skarn and early magnetite.

The deposit area is 0.5-2.5 km wide and 19.5 km long and is worked by seven mines. The western part of the area contains several isolated iron-rich skarn ore bodies, which are worked by mines 1-4. In the eastern part of the area, a continuous band of tin-rich skarn lenses, about 6 km long, occurs in marble along the southern contact of the eastern intrusion. These ore bodies are worked by mines 5-7.

The deposit is genetically related to the Anle deposit, which occurs in the contact aureole of the eastern intrusion. Both deposits form part of a metallogenic belt along a major EW-trending fault zone, which includes several skarn-type deposits with mineral associations that are similar to Huanggang (e.g. Haobugao and Hujiadian). A similar mineralization also occurs in the Sumugou deposit, which is located a little north of Huanggang.

The deposit is known for excellent and large (up to 20 cm) ilvaite crystals that came on the market around 2010. The locality is often erroneously given as "Baotou District" (Ottens, 2011).

(1) Cassiterite mainly occurs as microscopic inclusions in other minerals or as fine-grained to colloidal disseminations. Visible crystals are very small (Wang et al., 2007).
(2) Some specimens sold as hedenbergite turned out to be amphiboles upon analysis (Rock Currier, pers. commun.).
(3) Datolite occurs in mine no. 2, but some of the datolite specimens in trade are actually from a mine near Linxi (Ottens & Neumeier, 2012).
(4) According to Zhou et al. (2011), garnets vary in composition from andradite to grossular, with andradite fractions ranging from 28.7 to 96.4 mol-% and grossular fractions ranging from 2.0 to 67.4 mol-%. Garnets formed in early stages are andradites of nearly end-member composition, while garnets in the major ore-forming stage are grossular. The latter is also dominant in retrograde skarn assemblages. Likewise, pyroxenes change in composition from diopside in early stages to hedenbergite in the ore-forming stage. Thus, hedenbergite can be associated with grossular, but not with andradite. It is also not likely that all garnet specimens are andradites, although they appear to be notoriously sold as such.

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China Minerals trip: HuangGang mine,Keshiketeng Qi,ChiFeng,Inner Mongolia,2011 J by XiaoJun Chen

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Jianzhong Feng (1992) The isotopic characteristics of polymetallic deposits from Huanggangliang to Meng'entaolegai, eastern Inner Mongolia. Liaoning Geology 6(2), 117-126.
Daizo Ishiyama, Ryoji Sato, Toshio Mizuta, Yohei Ishikawa, and Jingbin Wang (2001) Characteristic Features of Tin-iron-copper Mineralization in the Anle-Huanggangliang Mining Area, Inner Mongolia, China. Resource Geology 51(4), 377-392.
Wang, L.J., Shimazaki, H., and Shiga, Y. (2001) Skarns and Genesis of the Huanggang Fe-Sn Deposit, Inner Mongolia, China. Resource Geology 51(4), 359-376.
Lijuan Wang, Hidehiko Shimazaki, Jingbin Wang, and Yuwang Wang (2001) Ore-forming fluid and metallization of the Huanggangliang skarn Fe-Sn deposit, Inner Mongolia. Science in China, Series D (Earth Sciences), 44(8), 735-747.
Lijuan Wang, Jingbing Wang, Yuwang Wang, and Hidehiko Shimazaki (2002) REE geochemistry of the Huanggangliang skarn Fe-Sn deposit, Inner Mongolia. Acta Petrologica Sinica 18(4), 575-584 (in Chinese with English abstract).
Chengdong Xiao and Xuewu Liu (2002) REE geochemistry and origin of skarn garnets from eastern Inner Mongolia. Geology in China 29(3), 311-316 (in Chinese with English abstract).
Yiming Zhao and Daxin Li (2003) Amphiboles in skarn deposits of China. Mineral Deposits 22(4), 345-359 (in Chinese with English abstract).
Chengdong Xiao and Yongfu Wei (2004) The zonation and the polymetal mineralization of skarns in eastern Inner Mongolia (EIM). Geological Survey and Research 27(suppl.), 9-15 (in Chinese with English abstract).
Wang Lijuan, Wang Yuwang, Wang Jingbin, and Günther, D. (2006) Fluid mineralization of the Dajing Sn-polymetal deposit: Evidence from LA-ICP-MS analysis of individual fluid inclusions. Chinese Science Bulletin 51(22), 2781-2788.
Changming Wang, Shouting Zhang, Jun Deng, and Jianming Liu (2007) The exhalative genesis of the stratabound skarn in the Huanggangliang Sn-Fe polymetallic deposit of Inner Mongolia. Acta Petrologica et Mineralogica 26(5), 409-417 (in Chinese with English abstract).
Zhenhua Zhou, Hongwei Liu, Guoxiong Chang, Linsu Li, Tao Li, Yongjun Yang, Ruijun Zhang, and Xianhe Ji (2011) Mineralogical characteristics of skarns in the Huanggang Sn-Fe deposit of Inner Mongolia and their metallogenic indicating significance. Acta Petrologica et Mineralogica 30(1), 97-112 (in Chinese with English abstract).
Ottens, B. (2011) Chinesisches Tagebuch (VII): Ilvait und andere Neufunde aus Nei Mongol. Lapis 36 (9), 27-33 (in German).
Zhenhua Zhou, Aishun Wang, and Tao Li (2011) Fluid inclusion characteristics and metallogenic mechanism of Huanggang Fe-Sn deposit in Inner Mongolia. Mineral Deposits 30(5), 867-889 (in Chinese with English abstract).
Mei Zhang, Yusheng Zhai, Cunli Shen, Yonghui Liu, Shuaishi Yang, Degao Zhai, Meijuan Yao, Jianping Wang, Shouguang Wang, Zhengxi Gao, and Ling Zhang (2011) Metallogenic system of copper-polymetallic deposits in the middle-southern part of Da Hinggan mountains, China. Geoscience 25(5), 819-831 (in Chinese with English abstract).
Degao Zhai, Jiajun Liu, Yongqiang Yang, Jianping Wang, Li Ding, Xingwang Liu, Mei Zhang, Meijuan Yao, Li Su, and Hongyu Zhang (2012) Petrogenetic and metallogenetic ages and tectonic setting of the Huanggangliang Fe-Sn deposit, Inner Mongolia. Acta Petrologica et Mineralogica 31(4), 513-523 (in Chinese with English abstract).
Ottens, B., and Neumeier, G. (2012) The Huanggang Mine, Inner Mongolia, China. Mineralogical Record 43, 529-563.
W. Mei, X. Lu, X. Cao, Z. Liu, Y. Zhao, Z. Ai, R. Tang, and M.M. Abfaua (2015) Ore genesis and hydrothermal evolution of the Huanggang skarn iron-tin polymetallic deposit southern Great Xing'an Range: Evidence from fluid inclusions and isotope analyses. Ore Geology Reviews 64, 239-252.

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