METHOD DETERMINING MOISTURE CONTENT IN CLAY ACCUMULATIONS IN WORKED OUT SPACE OF STEEPLY DEEPENING SEAMS Russian patent published in 1998 - IPC

FIELD: mining industry. SUBSTANCE: worked out space between holes drilled in top and bottom is exposed to electromagnetic radiation along many directions on frequency 20.0-100.0 kHz. Effective specific resistance of fallen rocks along paths of signals is found. Moisture content $$$ of fallen clay is determined by values of effective specific resistances on basis of regressive dependences between effective specific resistance and $$$ obtained beforehand during examination of standard section covered with same clay of fallen surface in which moisture content of clay is established by direct measurements. EFFECT: enhanced authenticity of exposure and mapping of clay accumulations hazardous by inrush into rock workings while working out steeply DEEPENING coal seams and ore deposits overlapped by clay deposits across outcrops. 5 cl, 2 dwg