SKYDB
Data backbone

Other information
besides just buildings.

SKYDB is built from regions, companies, photos and the dictionary that ties them together. Pick a thread to pull.

Explore database →

317,029 tall buildings

definition strict definition

coal mine

A site where coal is systematically extracted from the earth through tunnels, open excavation, or blasting.

A coal mine is a place where coal is removed from the earth for eventual use. It can be a system of tunnels, an open excavation, or blasted area where coal is systematically extracted.

The workings can be underground or exposed at the surface. Tunnels are therefore one possible form rather than a requirement for a coal mine.

Coal must be extracted at the site. Storage, transport, or use of coal brought from elsewhere does not by itself establish the mining use.

Related definitions