after
the ground has pulverized. During the fifteen years of my charge of De
Beers mines I have never found a diamond on the floors.
It
will be seen that no pains have been spared to hasten and cheapen the
flow of ground to the floors. After the blue ground has been spread
out, it is necessary to wait patiently until the sun and the rain have
contributed their service in disintegrating the breccia. The effect of
the exposure of this curious compound to heat and moisture is very
remarkable. Large pieces of blue, which are as hard as sandstone when
freshly taken from the mine, soon begin to crumble on the depositing
floors. To hasten the disintegration, the bed of blue is harrowed
several
