DEVELOPMENT METHOD OF DIAMOND-BEARING KIMBERLITE PIPES Russian patent published in 2012 - IPC E21C41/26 B03B7/00 

FIELD: mining.

SUBSTANCE: after the deposit is stripped, extraction field is separated into a mesh with rhombic cells with sides and a short diagonal, which are equal to diameter of the main well. First, service wells with diameter of not less than 93-112 mm are drilled in mesh nodes as centres; then, the main wells of large diameter are drilled concentrically to service well; core is pulled off the rock mass, lifted to the surface and removed from core barrel. After that, cores of large diameter are supplied to concentration plant and washed out with high-head hydraulic guns, and the pulp formed after excess water overflows from sediment trap is supplied to concentrating devices used during drag extraction of diamonds. After diamonds are extracted, shanks are dehydrated on centrifuges and supplied with the elevator to the warehouse from where they are taken for laying of drilled wells.

EFFECT: avoiding uncontrollable losses of diamonds during extraction, and reduction of formation of new mechanical defects on diamond crystals at kimberlite disintegration.

3 cl, 2 dwg