A mining term referring to the floor of a tunnel or mine. The opposite of the words tenban and kanmuri, which mean ceiling. When ore is excavated from the lower tunnel and reaches the upper tunnel, the mining is stopped to protect the tunnel, and the remaining part is called a "tomae-no-tako" (pillar of ore), and the later mining of this pillar is called "tomae-otoshi" (a process of dropping into a pile of ore). Of the many blast holes drilled to excavate the tunnel, the one close to the floor is sometimes called a "tomae-no-tako" (hole of ore). [Yamaguchi Umetaro] Source: Heibonsha World Encyclopedia, 2nd Edition Information |
坑道や採掘場の床面をさす鉱山用語。天井を意味する天盤,冠(かんむり)に対する語。鉱石を下部坑道から掘り上げて上部の坑道の近くにまで達したとき,その坑道を保持するために採掘を止めて残される部分を踏前鉱柱と称し,後にその鉱柱を採掘することを踏前落しなどと呼ぶ。また坑道掘進のためにせん孔される数多くの発破孔のうち,床面に近いものを踏前孔(あな)ということもある。【山口 梅太郎】
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