Concession #449 has been selected based on initial geological assessment using satellite images and geological maps. The strategy is to start with alluvial mining using dredges on the Kasai River for the initial years and later include eluvial/ terrace mining on the river banks. Whereas the alluvial (river) bed has a higher concentration of carats per metric ton of gravel (~2.5-5 ct./ton) per initial assessment, it should be noted that the level of certainty depends on the ability to target the right diamond-rich bed. This requires careful study of geological maps, satellite images, geological surveys and experience to target potential rich river beds. Terrace mining, on the other hand, has a lower level of carats per ton (~1 ct./ton) but is more certain if voluminous gravels can be procured