There are elaborate works for reducing the blue rock and passing it
through one process after another until every diamond it contains has
been hunted down and secured. I watched the "concentrators" at work big
tanks containing mud and water and invisible diamonds--and was told that
each could stir and churn and properly treat 300 car-loads of mud per day
1,600 pounds to the car-load--and reduce it to 3 car-loads of slush. I
saw the 3 carloads of slush taken to the "pulsators" and there reduced to
quarter of a load of nice clean dark-colored sand. Then I followed it to
the sorting tables and saw the men deftly and swiftly spread it out and
brush it about and seize the diamonds as they showed up. I assisted, and
once I found a diamond half as large as an almond. It is an exciting
kind of fishing, and you feel a fine thrill of pleasure every time you
detect the glow of one of those limpid pebbles through the veil of dark
sand. I would like to spend my Saturday holidays in that charming sport
every now and then. Of course there are disappointments. Sometimes you
find a diamond which is not a diamond; it is only a quartz crystal or
some such worthless thing.
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