There are plenty of exports from the DRC. The DFS will show how profitable a mine will be.
The top exports of the Democratic Republic of the Congo are Cobalt ($1.9B), Refined Copper ($1.79B), Copper Ore ($960M), Cobalt Oxides and Hydroxides ($721M) and Cobalt Ore ($512M), using the 1992 revision of the HS (Harmonized System) classification.
The top export destination of the Democratic Republic of the Congo is China ($3.26B).