Touring a South African Diamond
Mine - Oct. 2002
(click any picture to get enlargement)
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A friend of ours has a classmate who works at the Cullinan Diamond Mine,
which
is near Pretoria, South Africa. He arranged an underground tour
for a group
of us; there were no free samples though!
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Entering the mine area, owned by De Beers.
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The mine opened around 1900 and follows a
steam vent from an extinct volcano. Volcanos are the only thing hot enough
to melt carbon and create diamonds. Around 1950, due to an unproductive
layer, they had to go underground and began mining from beneath.
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The "Big Hole", which is getting
even deeper!
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The first task was to get dressed as a miner,
with boots, coveralls & helmet.
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Safety items included a light system and a
breathing pack; all heavy!
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Fashionable, huh?
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The walk to the lift area was tough with all
the additional weight!
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This tower & cables raise & lower the
lift to transport people & raw diggings.
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Is he worried? or upset at the gals for
searching the ground for diamonds?
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The mine consists of a 2200 foot shaft in
which the lift operates. At the bottom, a circular tunnel was built to
surround the steam vent. Emergency and support equipment is stored in
these areas. Tunnels are then dug into the vent and material is dug out
from the ceiling. The material is moved to crushers and then transported to the
surface.
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The group patiently listens to the
"lovely voice" of our British Lady Tour Guide, who has been
leading tours for 15 years.
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A typical miner :)
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A Core drilling machine
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Samples are being taken from below to assess
the potential for going to a deeper level; very costly!
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Pulling out core sample
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Conveyor Belt
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Once crushed, the material is transported to
the lift areas via a series of conveyor belts. We looked for shiny
diamonds in the dirt, but were told that the diamonds would be dull and thus
very hard to spot with our eyes.
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Resting tour members
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Once the material is on the surface, it is
send past workers who look for large raw diamonds; the largest in the world have
been found here! The material is then crushed further, which doesn't
affect the hard diamonds. The re-crushed material is wetted and sent over
a "sticky" conveyor belt. The heavy diamonds sink and stick to
the belt, which is then washed to recover the smaller diamonds. The waste
product is then cleaned and moved to large, unsightly, piles.
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Still hoping for a luck find!
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Surviving members in front of old cart which
was used to haul material
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Most of the diamonds, about 80%, are only good
enough for industrial use.
The higher quality stones are either cut
& sold on the property or sent to a DeBeer's center. Any
"big ones" are flown out via helicopter.
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A quick drink in front of the company store
leaves the group refreshed.
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No one in the group found or purchased any
diamonds; but there were "twinkles" in the eyes of the female
members. Warning to Males: Do not offer to bring your "significant
other" here... if forced to, NEVER bring the checkbook or credit card!
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