(1) Classification of mining methods and mining scale The mining methods of bentonite ore are open pit mining and underground mining. Using open-pit mining method of Liaoning Montenegro bentonite mining, bentonite mine in Xinyang, Henan, Hebei Qinghe bentonite mine in Zhangjiakou, Xuanhua bentonite mining, mineral sika bentonite, bentonite mine in Gansu Jiuquan, Gansu Kim Chang Hung-chuen, bentonite mining, Shantai Bentonite Mine, Quxian bentonite mine, Fujian Liancheng bentonite mine, Hubei Zaoyang bentonite mine, Xinjiang Keke bentonite mine in Toksun County, Xiazizi bentonite mine in Buxel County, Xinjiang, Altayzaerba bentonite mine in Xinjiang, Shandong Weifang bentonite mine, etc. . Underground mining includes Lin'an bentonite mine in Zhejiang Province, Qiushan magnetic clay mine in Zhejiang, and Jiulong bentonite mine in Jilin. Open-pit mining accounts for 75% of production, and open-pit mining accounts for 90% of mines. The rest is underground mining. From the current production situation, most of them are small mines. The division of mine size is usually based on ore production, but the calculation of output value, profit, etc. is based on the amount of concentrate, which is generally the case for joint ventures with mining and processing. (2) Developing transportation The development of open pit mining of bentonite mines generally uses road development, especially new mines. Liaoning Montenegro bentonite mine is the mid-1950s China's first batch of construction of the mine, the use of narrow roads and rail iron forge 14t motor vehicle, 762mm gauge, depression open pit mining, mine car using 3.5m 3 Dropside. Mining site geometry: surface length 900m, width 350m; bottom length 600m, width 30m; step height 10m.
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There are two types of mining scale: one is based on ore production, and the other is based on concentrate production, see the table below. 
The pioneering transportation of underground mining is divided according to the type of main roadway. At present, the bentonite mine has been built, and the ore body has a relatively low dip angle. It is a sloping or gently inclined deposit with a small burial depth and a scale of only 100,000 t/a. It is usually developed by inclined wells, such as Zhejiang Lin'an bentonite mine and Jilin Jiutai. Bentonite mine and Zhejiang Qiushan magnetite mine. Zhejiang Lin'an bentonite mine was developed with an inclined shaft on the upper plate. The wellbore was located at the west edge of the minefield with a dip angle of 25° and a single-wing diagonal ventilation system. 