open-pit coal mine; open-cut coal mine
A coal mine where mining is conducted from the surface, not underground.
There is a large open-pit coal mine in this area.
Open-pit coal mines are often safer than underground mining.
Standard spelling with okurigana り.
Variant without okurigana; less common but still used.
Compound of 露天掘り (open-pit mining) and 炭鉱 (coal mine).