Feature Analysis of wollastonite’s chapter one
The map of distribution of China’s 25 large (including superlarge) and medium-sized wollastonite occurrences with retained reserves as of 1997 is shown in Fig. 4.14.1. China’s wollastonite deposits are distributed in 13 Provinces and autonomous regions, mainly in the Jianping-Faku area of Liaoning Province and the Lishu-Panshi-Longjing area in Jilin Province in Northeast China. Major occurrences of wollastonite are in Jilin Province, and their retained reserves are more than 54 million tons, accounting for 40% of the total in China. Three ore districts are distributed from west to east in Dadingshan-Shiling of Lishu County, Changweizi-Shizhui in Panshi City and Xilihe of Longjing City. There are 10 retained occurrences (4 superlarge, 2 large, 3 medium-sized and 1 small occurrences). Some mineral occurrences are remained to be explored. Among the wollastonite-rich rocks in the Hunjiang area in the south of Jinlin Province, there are thick-bedded tremolites and wollastonite mineralized layers. These are important characteristics for ore finding. The area including the Dandingshan mine of Lishu County, Changweizi mine and Nancuochao mine in Panshi and Xilinhe mine in Longjing, Jilin Province, is the most important production base of wollastonite in China. There are more than 12 million tons retained wollastonite reserves in Faku County in the north and Jianping County in the northwest of Liaoning Province. The Chengzishan mine and Shangtanyao mine in Faku, which are the main occurrences of wollastonite and also the major production areas of wollastonite in China, have been already mined. Furthermore, there are also several small occurrences distributed in Mishan City of Heilingjiang Province.
Jiangxi Province in eastern China is also one of the main areas of occurrences of wollastonite, with retained reserves more than 16 million tons. The Chaofangmiao deposit in Xinyu City has been mined. The mining area in Xinyu-Shanggao is superlarge in size and should be further explored. New occurrences have been found in Mengshan in Shanggao County and Tieshan in Shangrao City. There are 8 million tons of retained reserves of wollastonite in the border area of Zhejiang, Anhui and Jiangsu Provinces. The mines in Lijiaxiang, Changxing County, Zhejiang Province, Miaoxi, Guangde County, Anhui Province and Xiaomeiling, Liyang City, Jiangshu Province have been mined and have become the main production areas in southern China. Furthermore, many mineral occurrences have been found in the areas from Huanning to Tongling in Anhui Province along the Yangtse River.
There is one retained occurrence of wollastonite respectively in Hubei, Hunan, Guangdong and Guangxi in south-central China, with retained ore reserves totalling nearly 4 million tons. The Chaotian mine (large) in Lianzhou City, Guangdong Province, Xiaojipu mine (small) in Daye City, Hubei Province and Nanyuandong mine (small) in Pingle County, Guangxi Autonomous Region have been mined. Some mineral occurrences in Date-Yangxin in Hubei, and Dayishan, Changning County in Hunan Province remain to be explored.
There are superlarge wollastonite deposits in Baishiyan, Mingguang Town, Tengchong County in southwestern Yunnan Province in southwestern China, and Haisi, Dulan County in central part Qinghai Province in northwestern China, with retained reserves of 23.93 million tons and 13.15 million tons respectively, and are available to use or need to be further explored. Furthermore, wollastonite mineral occurrences have been found in the Hami area, Xinjiang. In North China, no better wollastonite occurrences have been found yet. There is only one associated medium-sized wollastonite deposit found in the Bayan Nur lead-zinc deposit in Bairin Zuoqi, Inner Mongolia. Mineral occurrences have been found in Xiaoxiying, Qianxi County, Hebei Province.Henan Hongxing Mining Machinery Co., Ltd is the professional manufacturer of complete sets of mining machinery, for example,spiral separator,sand maker Welcome all of you to visit our official website.shaking concentrator:http://www.hxjq-crusher.com/31.html
China’s wollastonite deposits may be divided into 3 types: contact metamorphic, skarns (contact metasomatic) and regional metamorphic types. The contact metamorphic type of deposits is the most important type, and their retained reserves account for 80% of the total retained reserves. These deposits formed by metamorphism of silicon-rich limestone due to baking of intrusive bodies, and are usually located in hornsified-marbleized exocontact zone between intermediate-acid and acid intrusive rocks and carbonate rocks. They are generally several tens of meters and even more than a thousand meters away from the rock body. The ore bodies usually occur in the stratified, stratoid or lenticular shape with a length from a few hundred to more than a thousand meters and a width from several to several tens of meters and even more than a hundred meters. The size of deposits is mainly large and superlarge. The ores are of wollastonite-quartz-calcite type. Their mineral assembleage is rather simple and the ore quality is good with an ore grade (content of wollastonite or ore-bearing coefficient) of 20%~70%, more than 50% generally. The grade of rich ores reaches 95%. These are the main mining object in China. The deposits distributed in Jilin, Liaoning, Zhejiang and Jiangxi Provinces belong to this type. Most of skarns type deposits are distributed in the exocontact zone of intermediate to acid intrusive rocks with siliceous limestone. A few of them occur inside intrusive rock bodies and country rocks. The shapes of the ore bodies are variable. They occur discontinuously and form an ore belt with a length from several meters to several hundred meters and a thickness from several meters to forty or fifty and even seventy or eighty meters. The ores are of skarns rock type with a complex mineral composition. The grade of ores is mainly between 40%~60%, and exceptionally reaches 68%. The harmful component Fe2O3 in part of deposits is higher. In some cases wollastonite is associated with nonferrous metals, so is difficult to mine and dress. Deposits of different sizes distributed in Hubei, Jiangsu, Hunan and Qinghai and so on belong to this type. Now the regional metamorphic mineral occurrences have only been found in the Hunjiang area in southern Jilin Province, and there are no explored reserves.
China’s wollastonite deposits are mostly hosted in cover formations since the Cambrian , and mainly occur in the Carboniferous and Permian in Cambrian, Devonian and Silurian. The intrusive rocks associated with mineralization are mainly Yanshanian,Indosinian and Hercynian intermediate and acid magmatic rocks.
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