As the world starts to depend on these minerals more and more. Wars fought over them will sadly increase.
I only read the wiki entry briefly, but it sounds like the mineral wealth helps finance the civil war, but isn't the cause of it. That is much deeper seated in the history of the different ethnic and religious groups, colonial rule, and so forth.
If it weren't coltan and electronic products, it would be diamonds, or silver, or poppies, or something else. If they want to fight they will find whatever means necessary to finance it.
Blessed are those who make peace...