The diamonds were thus deposited along the banks of the Orange and at the river's mouth, with the thickest layer of diamondiferous gravel being laid down between 20 and 15 million years ago.
Ngakho-ke amadayimane asala eceleni komfula i-Orange nasemlonyeni womfula, amadayimane amakhulu kunawo wonke abekwa phansi phakathi kweminyaka eyizigidi ezimbili kuya kweziyishumi nanhlanu edlule.