noun
open-pit coal mine; open-cut coal mine
A coal mine where mining is conducted from the surface, not underground.
この地域には大規模な露天掘り炭鉱がある。
There is a large open-pit coal mine in this area.
露天掘り炭鉱は地下採掘より安全な場合が多い。
Open-pit coal mines are often safer than underground mining.
Compound of 露天掘り (open-pit mining) and 炭鉱 (coal mine).