Which one of the following pairs is not correctly matched ?

Kimbcrley - Diamond
Witwatersrand - Gold
Katomga - Copper
Saar - Iron ore

The correct answer is (c). Katanga is a province in the Democratic Republic of the Congo that is known for its copper and cobalt reserves. It is not known for its gold deposits.

(a) Kimberley is a city in South Africa that is known for its diamond mines.
(b) Witwatersrand is a region in South Africa that is known for its gold mines.
(d) Saar is a region in Germany that is known for its iron ore deposits.