These are combined state ores are generally found in the form of oxides, sulphides, carbonates, sulphates, chlorides and silicates.

Ore	Ore or Mineral	Composition	Metal Present
Oxide ores	Bauxite	Al2O3 .2H2O	Al
	Cuprite	Cu2O	Cu
	Haematite	Fe2O3	Fe
	Zincite	ZnO	Zn
	Tinstone    or Casseterite	SnO2	Sn
	Pyrolusite	MnO2	Mn
	Pitch Blende	U3O8	U
Sulphide ores	CopperPyrites	Cu2S, Fe2S3 or Cu2S . FeS2	Cu
	Copper Glance	Cu2S	Cu
	Zinc Blende	ZnS	Zn
	Cinnabar	HgS	Hg
	Galena	PbS	Pb
	Argentite or Silver Glance	Ag2S	Ag
Carbonate ores	Magnesite	MgCO3	Mg
	Dolomite	CaCO3.MgCO3	Mg
	Calamine	ZnCO3	Zn
	Malachite	CuCO3.Cu(OH)2	Cu
	Limestone	CaCO3	Ca
Halide ores	Rock Salt	NaCl	Na
	Carnallite	KCl.MgCl2.6H2O	Mg
	Horn Silver	AgCl	Ag
	Sylvine	KCl	K
	Cryolite	3 NaF.AlF3 or Na3AlF6	Al
Sulphate ores	Epsom Salt	MgSO4.7H2O	Mg
	Gypsum	CaSO4.2H2O	Ca
	Barytes	BaSO4	Ba
	Anglesite	PbSO4	Pb
Silicate ores	Asbestos	CaSiO3.3MgSiO3	Mg
	Felspar	K2O.Al2O3.6SiO2 or KAlSi3O8	Al
	Mica	K2O.3Al2O3.6SiO22H2O	Al
Phosphate ores	Phosphorite	Ca3(PO4)2	P