Sounds twisted but anything is possible in the wicked plans of men especially white people. But:-
Most of those deposits of minerals are being mined by foreign companies. We do not know the deal the government struck with these companies as to sharing of profits. Usually, the companies take most of the profits and it would be in their interest to maintain peace.
I doubt they would deliberately destabilize the Kenyan economy or the peace in Kenya. One, the Kenyan economy is non-existent since we are deep in debt. The economy is aid money from those who are meant to destabilize us.
And, Kenya serves the strategic interest of most of these countries since we are one of the "islands of peace" compared to most of our neighbors. 2007 demonstrated that the international community cannot let Kenya burn to the ground unlike a country like Rwanda in 1994.
Greed is fear.