In the '90s, CalPortland purchased a used Marion dragline with a 16-yard bucket. The dragline allowed the
plant to complete much of the mining that couldn't be accomplished with other mining equipment.
to the shore. Then he lifts it out of the
water and dumps the material into a spoil
pile. A front-end loader scoops up the
material from the pile and loads it into the
haul trucks, which carry it to a belt feeder.
The belt feeder feeds the material onto a
48-inch-wide, 4,500-foot-long overland
conveyor, where it dumps the material on-
to another 1,200-foot-long conveyor, and
then another 2,200-foot-long conveyor.
The conveyor system eventually carries the
material to a portable processing plant that
has been set up in a permanent location.
The processing plant has a 6 x16 vibratory screen and a jaw crusher. Larger material
is sized through the screen and moved to a
stockpile area. There, it is either stockpiled
or sent on to a tunnel where it goes up a series of conveyors to a screening tower. The
screening tower has two screens — a 7x20
JCI and a 7x20 Telsmith.
At this point, concrete aggregate is
pulled out, and sand is filtered through
a sump at the bottom of the tower and
pumped through a tunnel that goes underneath all of the stockpiles. The sand is
pumped through an HDPE sand line that
runs out to an underground sand classifier
system. At the classifier, the concrete sand
can be blended with other products. The
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