Custom manufacture of chemicals for industrial use; assembly of products for others; treatment of materials, namely, processing and treatment of mineral and metalliferous ores in gaseous, solid, liquid, dispersed and suspended form for use in the later extraction of base metals, in particular, lead, zinc, copper, nickel, cobalt, silver and gold; treatment of metal, namely, extraction of pure metals through metallurgical and hydrometallurgical processes; providing technical information in the ...