WO02075361 GEOSTEERING OF SOLID MINERAL MINING MACHINES.

A rock avoidance control system for solid mineral mining using a forward looking rock/mineral interface detector and controlling the miner to cut to the detected rock/mineral interface. One or more armored gamma ray detectors are positioned near the cutter and move with the cuter such that the angular size of the field of view is not reduced. Angular movements of the cutter are measured and used for calculating the rock/mineral interface location. A device is incorporated within an armored rock detector to sense angular movements of the cutter boom and to correlate changes in gamma radiation to the angular movements, within selected energy ranges. The thickness of the remaining coal is calculated by measuring the rate at which the gamma radiation increases.; In one embodiment, rock detectors are used to steer the cutting of the leading drum and/or the trailing drum a long-wall mining system.

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