| 摘要 |
A method for combined development of diamond pipes that includes opening of tube with vertical or inclined mine stems and cross-cuts, driving at drawing-off level of at least one permanent mine opening and one development opening, as well as a system of breakoffs, drilling from earth surface of churn-drill holes, destruction of mineral through churn-drill holes, delivery of destructed mineral through shafts and churn-drill holes to earth surface for following dressing. Working out of tube in depth is carried out in two steps: at first step one performs extraction of mineral in two stages from massif of blue grounds in the form of turned truncated cone the lower base of which is placed at boundary of economic mining depth, and its upper base coincides with the lower base of protective pillar left in crater section of the pipe. At second stage one performs extraction of mineral within protective pillar through broadening of churn-drill holes in direction of the protective pillar base. |
