Underground Water of the Makimine Mine

Abstract

Makimine Mine, Miyazaki Prefecture, works the bedded cupriferous iron sulphidedeposit occured in the black phyllitic formation of the Shimanto Complex. When the underground developments approached the dike of granite porphyry, intruded north of the deposits, the faults bearing the water of high pressure appeared.
These faults are parallel with the dike of granite porphyy, and give little displacement to the deposits, and have the sheared zone of 1 m. in width.
The underground water of these faults has no special chemical component, volume of 4m³/min and pressure of 35-50kg/cm², and has prevented the underground mine-developments.
For shielding the underground water, cement grouting was effective.