2019-3-6 · tantalum, base metals (like copper, lead and Zinc), industrial minerals (like phosphate, iron ore), gemstones (like ruby, emerald, sapphire, garnet, etc) and also decorative and dimension stones such as marble, granite and other coloured stones. The sedimentary (Mesozoic) rocks also host, other than the natural fuel minerals (oil, gas, oil shale,
