A Controlled Blasting Method for Improving the Efficiency of Ore Dropping by Cutting and Filling Method

Abstract

The invention discloses a blasting control method for improving the ore breaking efficiency of a wall-cutting filling method. The blasting control method comprises the steps that a wall-cutting blast hole is drilled in hanging side surrounding rock or heading side surrounding rock of a to-be-cut wall, a first-time ore breaking blast hole is drilled in a vein, and blasting of the first-time ore breaking blast hole is carried out; a secondary ore breaking blast hole is drilled in the vein, blasting of the secondary ore breaking blast hole is carried out, and concentrated ore drawing is conducted; blasting of the wall-cutting blast hole is carried out, and a stope is filled; and circulation is conducted in this way till stoping of a whole ore block is completed. According to the blasting control method, by introducing the blasting control technology of two-time ore breaking and one-time wall-cutting in the wall-cutting filling method, the quantity of the caved ores is greatly increased, the mixed waste ore quantity is obviously decreased, and the ore breaking efficiency of the wall-cutting filling method is promoted.

Description

technical field [0001] The invention relates to a controlled blasting method in an underground metal mine, in particular to a controlled blasting method suitable for thin ore veins and improving the ore falling efficiency of the wall cutting and filling method. Background technique [0002] In the field of non-ferrous metal and gold mines, many ore deposits belong to extremely thin veins. Due to the small width of these veins, in order to ensure sufficient working space, wall cutting and filling methods are generally used for mining. [0003] In the existing wall cutting and filling mining method (for example, the application number is 201610067459.2, and the name is a kind of thin vein pre-cracking wall filling mining method), the ore vein (wall rock) is first collapsed once, and then the surrounding rock (mine vein) waste rock is filled once. The space left by the ore body is extracted, and the cycle is repeated until the mining of the ore block is completed. Although thi...

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Problems solved by technology

Although this method can realize the separate mining of thin ore veins and reduce the dilution rate of thin ore vein mining, but because the ore veins are too narrow, the amount of falling ore is small, and waste rocks are easily mixed in the ore, and the production efficiency is low. Increase and beneficiation costs, shorten the service life of tailings ponds, seriously restrict the development of mines, and affect the economic benefits of enterprises

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