MONITORING METHOD FOR ANOMALOUS ZONES OF WATERPROOF LAYER IN POTASSIUM MINE Russian patent published in 2005 - IPC

FIELD: mining industry, particularly for developing potash fields located under water-bearing horizons.

SUBSTANCE: method involves performing detailed geological description of anomalous zone during anomalous zone opening by excavation thereof; investigating the zone with the use of electrical and seismic methods and determining risk level of the anomalous zone; developing system and frequency of geophysical monitoring investigations. After initiating of roof sheeting and caving in side wall of mine excavated in anomalous zone along upper developing stratum one may drill horizontal boreholes having 1m length. Distance between boreholes depends on degree and level of anomalous zone danger and vary from 10 to 100 m. Temperature gauges used to measure saliferous rock temperature are installed in bottomhole zone. Temperature reduction for 10-20% indicates that cold underground water from upper water-bearing horizons enters into salt layer and salts began to dissolve in water. If above effect took place area of above process location and configuration of the area are determined and preparation for performing necessary works to liquidate salt water appearance in mine are begun.

EFFECT: increased control precision.