What is being built for the extraction of solid minerals? Liquid?

Solid minerals are coal, peat, iron ore, granite, sand, clay and others. They can be mined on the surface of the earth and in special mines that are deep underground. In such mines there is a whole system of passages and tunnels in which people work.

Liquid minerals are oil, various mineral waters. They are mined using special wells and pipes. Thus, the minerals are pumped out of the earth to the surface through these wells.