Caterpillar Performance Handbook, January 2017, SEBD0351-47

Rock Straight System ● Introduction

Hard Rock

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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 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 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 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.

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.

Edition 47 20-25