Gold, tin, tantalum, tungsten (the "3 T's"), are mined in eastern Congo and are in all consumer electronics products also called Conflict Minerals.

Tin

A metallic element

Element symbol: Sn

Atomic number: 50

China's tin reserves are rich, annual production more than 50,000 tons, and one third metal tin and half of tin ore concentrates for export.

Tungsten or Wolfram

A metallic element

Element symbol: W

Atomic number: 74

Density: 19.35 g/cm³

China is the largest tungsten storage country in the world.

Tantalum

A metallic element

Element symbol: Ta

Atomic number: 73

China's tantalum-niobium ores are rich in resources.