DRYING METHOD OF BLOCK TO BE EXPLODED DURING DIRECT COAL EXTRACTION TECHNOLOGY Russian patent published in 2012 - IPC E21C41/28 F42D3/04 

FIELD: mining.

SUBSTANCE: block to be exploded is drilled around the perimeter of its connection to rock mass by means of a row of wells in 3-4 metres. At that, during preparation for drilling and explosion loosening the well rocks in the row are drilled to the depth below the coal formation through the distance excluding the formation destruction during explosion of row by means of base charge.

EFFECT: reducing the cost of rock mass to be exploded owing to using explosives non-resistant to water as a result of drying of the block to be exploded.

1 dwg