Question

two examples of coal mines​

Answer 1

Answer:Surface mining and deep underground mining are the two basic methods of mining.

Explanation:

Answer 2

Answer:

hope it helps u

Explanation:

Surface mining and deep underground mining are the two basic methods of mining. The choice of mining method depends primarily on depth, density, overburden, and thickness of the coal seam; seams relatively close to the surface, at depths less than approximately 55 m (180 ft), are usually surface mined