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Hard Rock
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Edition 47 20-25
Rock Straight System
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Introduction
ROCK STRAIGHT SYSTEM
Introduction
The Cat Rock Straight System is a fully mechanized
longwall system adopted to hard rock conditions for
continuous mining of flat and tabular deposits and reefs.
The Rock Straight System combines the use of a hard
rock shearer (Hard Rock Miner HRM220), a hard
rock chain conveyor (Hard Rock Conveyor HRC30)
and hydraulic roof support (Hard Rock Roof Support
HRS1220). It features the adaptation of the newly
developed “Cat Activated Undercutting Technology”
and has been particularly designed for the extraction
of bedded hard rock deposits (e.g. copper, gold).
The Rock Straight System particularly provides eco-
nomical cutting in the mining of thin seams and narrow
veins, especially when selective mining of ore is required.
The powerful Hard Rock Miner HRM220 is designed
for continuous cutting operation in low seam heights
of between 1.3 to 2.0 m (4.2 to 6.6 ft). The two cutting
units can be adjusted in terms of height to maximize
the productivity of a single cutting sequence. A haulage
speed of up to 6 m/min (19.7 ft/min) in combination
with a maximum cutting depth of 100 mm (3.9 in)
delivers high production rates.
The HRC30 is a newly developed apron face conveyor
to suit hard rock applications. Its design is extremely flat,
nevertheless sturdy, to transport hard rock in low cutting
heights. The conveyor’s modular architecture can be
tailored to suit face lengths of up to 100 m (328 ft).
The HRS1220 Hard Rock Roof Support provides cus-
tomers with state-of-the-art technology to maximize the
control of the surrounding rock. They have been spe-
cifically engineered to meet the difficult conditions in
hard rock mining. Hydraulic cylinders combined with
advancing rams guarantee a high level of mechanization.