adit

Japanese: adit
adit

...Drainage pipes, power cables, and everything else that's needed go through these inclined shafts.
[Yokosha adit(drift, gallery)]
Adits are tunnels that enter almost horizontally, but there are many cases where deposits are developed from the mountainside via adits. As the deposit developed from the outcrop at the top of the mountain descends, more and more adits are excavated to continue mining.

*Some of the terminology explanations that mention "adit" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…排水用のパイプや動力のケーブルなど,必要なものはすべて,これらの斜坑を通って行く。
[横坑adit(drift,gallery)]
 横坑はほぼ水平に入る坑道であるが,山腹から横坑で鉱床を開発する例は多い。山頂部の露頭から開発した鉱床が下部へ下るのを追って,つぎつぎと横坑を開削して採掘を継続する。…

※「adit」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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