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(2)使用电耙的房柱法:使用电耙的地方,首先沿着斜坑每隔20呎开掘一条对斜坑成直角的水平坑道。在水平坑道中敷设複線轨道,一方面可使鑛车在采鑛场附近进行装车,同时在坑道上设置电耙及操緃电耙的複胴捲扬机设备的车辆,每隔200呎即开掘与斜坑平行的天井,伴随采鑛场采掘作业之进行逐渐扩充。于天井两则进行鑿岩与爆破,爆破的鑛石则用电耙運入下部的鑛车中。(参照第五图)
(2) House-and-column method using electric rakes: When using electric rakes, first excavate a horizontal tunnel at right angles to the craters every 20 feet along the craters. The laying of double track in the horizontal tunnel, on the one hand can make the car near the mining yard loading, at the same time in the tunnel set up electric rake and electric rake compound recovery winch equipment vehicles, every 200 feet Paving the pit parallel to the pit, with mining operations gradually expanded. Drills and blasting were carried out on two of the patios, and the demolished ore was delivered to the lower mine car using a power harrow. (See Figure 5)