Made a quick trip to google, found this easy view of their mineral wealth which seem to interest Europeans and certain Americans:
(snip)
Despite difficulties, and while never enjoying true
economic developments that would have brought a decent
standard of living to Zaire's now 40 million people, Zaire
nonetheless was able to harness and mine some of its
immense raw materials wealth. A sample of what Zaire
accomplished can be gleaned from the report of the
{Minerals Yearbook}, published by the Bureau of the Mines
of the U.S. Department of Interior (Vol. III). In 1988,
among the world's raw materials mining countries, Zaire
held the following rank, for the following commodities:
Cobalt -- world's largest producer and exporter
Diamonds -- 2nd in the world
Copper -- 5th in the world
Tin -- 12th in the world
Zinc -- 20th in the world
Zaire also mined other commodities, such as
barite, boron, magnesium, and gold. Because of
historical ties, Zaire shipped a good amount of these
goods to Belgium. In the 1960s, in order to run its mining
operations, Zaire created the state-owned La
Generale des Carrieres et des Mines du Zaire,
which is known by its acronym, Gecamines. One of its other
important state-owned companies was based in Kivu
province, the Societe Miniere et Industrielle de
Kivu, known by its acronym Sominki.
When Belgium granted Zaire independence, it
bequeathed to Zaire about $5 billion in debt, which
Belgium had run up. By the late 1980s, Zaire's debt stood
at about $8 billion--a large debt for a small economy
based on raw materials and food, but no manufacturing.
Zaire got further and further behind on its debt payments,
and finally defaulted on most of it in the early 1990s.
This was the excuse that the banks wanted. They
demanded that Zaire pay the debt, but also, joined by the
World Bank and others, demanded that Zaire ``democratize''
its government and, especially, privatize its state-owned
raw materials mining concerns. Privatization had three
components: slashing the social services provided to
miners by law, laying off half the workforce at Gecamines,
and selling more than half of the different properties of
Gecamines and Sominki to foreign investors. Secessionist
movements were started in Shaba province; the net effect
would be to dismantle the Zairean state.
(snip/...)
http://www.members.tripod.com/american_almanac/bushgold.htm~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~The article, written in the '90's, I believe, makes reference to George H. W. Bush's abiding interest in the area, which is mentioned frequently in general reading. I know I've bumped into it, not even looking for it.