Most of Mozambique's mining and mineral processing operations are privately owned, including the cement plants, the coal mines, the Marropino and the Muiane tantalum mines, the Moma mineral sands mine, and the Mozal aluminum smelter. The Government held a 30% interest in the Temane gas project through Empresa Nacional de Hidrocarbonetos E.P. Artisanal miners produce gold and gemstones