November 23, 1937. Kimberley: Looking southward along the great dump upon which waste materials are thrown after concentration of the diamond bearing 'blue ground'. The ore from all the mines is brought to a single plant for 'direct treatment.' The incoming ore and the returning empty cars are seen on the track crossing the dump in the foreground. The mines are off to the right of the picture and their product is brought to a chute leading down to the concentration plant seen in the upper middle of the picture. About 70,000 tons of blue ground are mined and concentrated weekly to yield roughly ten pound's weight of diamonds. 6700 feet. 17:45.