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At Ho-pi (Hopi) in northern Honan two modern shafts were under construction in 1957-8; but the coal from Ho-pi is expected to be of rather poor quality and so will be mixed with rich coal from P'ing-ting-shan (Pingtingshan) in central Honan for coke making.
Especially notable among the large mines are . . . ; and the four mines at Ho-pi in Honan Province, which were among the first mines to adopt hydraulic coal mining.
At Ho-pi (Hopi) in northern Honan two modern shafts were under construction in 1957—58: but the coal from Ho-pi is expected to be of rather poor quality and so will be mixed with rich coal from P’ing-ting-shan (Pingtingshan) in central Honan for coke making.
In time, this evolved into the room and pillar (or pillar and stope) method that came to be used widely, especially in Chinese coal mines. We have good evidence for the use of this technique in the remains of a Sung/Yuan (c. +13th century) coal mine at Ho-pi鶴壁 in Honan (some 25 km southwest of An-yang).
