What is the most common miniral in West Africa

Answer: The answer is Gold.

It depends on your definition of West Africa though because Ghana used to be called the Gold Coast.

Mining in West Africa has a source of gold, iron ore, uranium and diamonds. The region is also rich in aluminium, nickel, phosphate, manganese and zinc. Most of the mineral wealth in this region remains undeveloped, meaning West Africa's importance in the global mineral economy will increase in the future.