There is a children labor problem in the DRC, as the Amnesty report states. Source: report 1.
Media have covered the issue quite a lot, here is an example on CNN.
But there are no children in the industrial mines, and in some traditional mines. The new mining code forbids child labor. Source: here.
Efforts are made by the government, international organizations and industry to eradicate the problem and offer a safer working environment, such as the Mutoshi experience, with great results. Source: here.