ary
bottoms covered with screens with square meshes. The meshes are a
little coarser than the perforated plates of the cylinders that size
the concentrate for the jigs. Upon the jig screens a layer of leaden
bullets for the finer sizes and iron for the coarser sizes is spread,
forming a bed that prevents the deposit from passing through the screen
too rapidly. The heaviest part of the deposit with the diamonds passes
through the screens into pointed boxes, from which the deposit is drawn
off and taken to the sorting tables. The lighter material or refuse
flows over the ends of the jigs into trucks, which are hauled away and
dumped on the tailing heap.
Only
one per cent of the total amount of ground washed, or one in a hundred
loads, goes to the Pulsator in the form of concentrate. Eight and a
half per cent of this passes through the screens below the five-eighth
inch size, thirty-three and a half per cent is above that size, and the
balance, fifty-eight per cent, flows over the jigs as waste. Formerly,
for every hundred loads washed, five-twelfths of a load passed over the
sorting tables,
