surface mining; open-pit mining; open-cut mining
Mining method where minerals are extracted from an open pit or surface excavation, as opposed to underground mining (坑内掘り).
See also: 坑内掘り
In this region, coal is mined by open-pit mining.
Surface mining is often less costly than underground mining.
open-pit coal mine; open-cut coal mine
Standard spelling with regular okurigana.
Irregular okurigana variant; less common but still encountered.
Compound of 露天 (ろてん, 'open air') + 掘り (ぼり, 'digging'), literally 'open-air digging'.