Extraction de minéraux et de matériaux divers : terraux et humus, mat abrasives, amiante, farines siliceuses fossiles, graphite naturel, stéatite (talc), feldspath, pierres gemmes, quartz, mica, etc.

Extraction of various minerals and materials: breeding ground and humus, abrasive materials, asbestos, siliceous fossil meals, natural graphite, steatite (talc), feldspar, gemstones,quartz,mica,etc