FIELD: environmental control; may be used in underground leaching of placer deposits of noble metals. SUBSTANCE: method includes treatment of rocks with perchlorate-chloride solution with simultaneous neutralization and rendering safe of technogenic stratal waters which are deposited to natural drainage. For this purpose, system of drainage boreholes and/or ditches sunk down to reck bed are made downstream the worked deposit, across flow of stratal waters. The system is filled with mixture of materials capable of neutralization of excessive acidity, reduction of hypochlorate and gold sorption, and also trapping of harmful trace contaminants of copper, mercury, arsenic. Materials used for this purpose include calcite, manganese spar, dolomite, magnesite, pyrite, sulfur, charcoal and activated carbon, iron fillings. EFFECT: higher efficiency. 11 cl
