Adam Hochschild's piece in the March/April issue of Mother Jones, describes how the Congo's vast natural resources are continuously pillaged to feed foreign interests to the detriment of locals, their environment, and now gorillas.
CNN reports: Militias have seized large chunks of gorilla land and logged and mined it. They have done so because the illegal trade in timber and in metals such as gold and coltan -- used in cell phones -- generates between $14 million and $50 million a year for them.
Said Achim Steiner, UN Under-Secretary General and Executive Director of the UNEP: This is a tragedy for the great apes and one also for countless other species being impacted by this intensifying and all too often illegal trade. Ultimately it is also a tragedy for the people living in the communities and countries concerned.
MineralMan Clarifies: Coltan is not a metal. It is a tradename for the minerals columbite and tantalite, which almost always occur together. They are the ores of niobium and tantalum, two rare metals that have uses in electronics.
The Congo is the main source of these minerals. However, there are large deposits, as well, in Canada. It's just cheaper to mine them in Congo. So, that's where the ores for those two useful metals are mined.
Also add,
http://www.naturalsciences.be/science/projects/gorilla/external/pdf/statusreport_gbg__july2007.pdf">Status report: Gorilla beringei graueri.
It's a bit dated, but the causal story remains the same.
"By the mid1990s there where estimated to be about 17000 (9000-25000) Eastern Lowland gorillas in at least 11 subpopulations, with ca 86 percent living in the Kahuzi-Biega and the adjacent Kasese region of RDC."
"More recent events in Kahuzi-Biega and the surrounding region, however, indicate that the taxon has undergone a substantial decline in numbers. Access to much of the gorilla range has been difficult in recent years, and is only just becoming possible again"
"This is attributed to the combined effects of the rise in demand for coltan ore and the warfare that engulfed the whole of the eastern lowland gorilla range from the late 1990s onwards; armies, rebels, refugees and miners all lived off the land and consumed bushmeat"
A look at the map on page 5 of the report shows that the once substantial Kahuzi-Biega Western Lowland Gorilla population is located due West, and a short hop, skip and jump from Rwanda.