The diamond deposits are alluvial occurrences, which are limited to remnant palaeo-channel deposits of unconsolidated gravels deposited in two deposition cycles. The Miocene, wave of deposition, which also dissected the older terraces, now forming the more recent paleo terraces. These two deposits are classified as the Arrisdrift Gravel Formation.

Ore is mined using open pit mining methods from numerous small, localised alluvial gravel resources. Mining is carried out with open pit truck and shovel operations from the diamondiferous gravels after removal of overburden. The general method employed is strip mining. The paleo-channels and terraces which host the diamondiferous gravels vary in width and overburden depth and, as such are subject to varying degrees of continuity for active mining faces. Mining also encompasses rehandling and reprocessing of remnant tailings and stockpiled material. The mining fleet is consistent across these operations, with the exception of the dredging operations undertaken at Shallow Water.

Reuning Mine is situated in the vicinity of Sendelingsdrift on the banks of the lower Orange River in the Richtersveld Transfrontier National Park. The mining operations include a newly installed oreprocessing and final recovery plant at Reuning, a 50 tons/hour dense medium separation (DMS) plant at Suidhek and a recommissioned mine at Jakkalsberg.