| Tantalite | Ethiopia and Niger | Used in electronics industry for capacitors and high power resistors. Also used in making alloys to increase strength, ductility and corrosion resistance. |
| Cobalt | Zambia | Used as superalloy in aerospace, electricity generation, aircraft and automotive. Also used in hard metals and diamond tools, catalysts in oil and gas refinement. |
| Copper | Ethiopia and Zambia | Used in electrical equipment such as wiring and motors due to good heat and electrical conductivity. Also can be found in construction (roofing and plumbing) and industrial machines such as heat exchanges. |
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