Leonardo DiCaprio

Businesses trying to comply with 'conflict minerals' law

Businesses trying to comply with 'conflict minerals' law

The argument goes that using a smartphone made from materials mined in war-torn Africa is no better than buying so-called blood diamonds.

Rebel groups in the eastern hills of the Democratic Republic of the Congo and neighboring countries run mines that produce key minerals used in the manufacture of consumer electronics and more mundane products such as zippers. The proceeds fund continuing strife that's killed up to 5 million people since 1998, more than any conflict since World War II.

In hopes of stemming the use of such "conflict minerals" from the Congo — and perhaps bringing peace or easing the humanitarian crisis there — Congress included a...