[1] Natron deposits were located around the shore of Lake Chad and the wadis of Kanem Prefecture,[1] and near the oasis of Faya-Largeau.
[1] Exploration in 1985 by the Exxon-led consortium discovered potentially large deposits near Doba in the southern region of Chad.
[1] Further efforts were suspended in 1986 when world oil prices continued to drop, although the consortium maintained a liaison office in N'Djamena in 1988.
[1] Plans existed in the late 1970s to exploit the deposits at Sédigi and to construct a small refinery at N'Djamena.
[1] The plans, which anticipated operations to begin in the early 1990s, included well development in the Sédigi field, a pipeline to N'Djamena, a refinery with a 2,000- to 5,000 barrels per day (790 m3/d) capacity, and the transformation or acquisition of power-generating equipment in the capital to burn the refinery's residual fuel oil.