R. B. YUN'S METHOD FOR THE EXPLOITATION OF OPEN-AIR MINING FIELDS

摘要

The present invention pertains to the mining industry and may be used in the exploitation of ore fields regardless of their thickness or stratification angle in order to reduce the amount of day-lighting operations. This invention involves exploiting the main fields during open-air mining operations in order to form protection benches (22) on the quarry faces. In one plane, the fields of each level (1) are exploited by exploding underlying wells in the direction of the quarry working boundary in order to form protection prisms on the planned outline of said quarry. The protection prisms (5) are broken down during the final step of operations on the level (1) so as to form a vertical or nearly vertical talus within the limits of said level. The rocks of the massif (6) surrounding the outline, in the regions where they are likely to move, are reinforced by injection and/or by placing prestressed anchors.