(1) Overview

(1) applies to mining ore is very solid, and the surrounding rock or ore is very unstable, but the ore grade is high or very high value of rare metals or non-ferrous ore body.

(2) The essence of this mining method: it is stratified from top to bottom and layer-by-layer filling. The ploughing operation of each layer is carried out under the protection of reinforced concrete roof, and the reinforced concrete roof is in the previous layer. Laying at the end of the mining. The mining stratification can be horizontal or inclined at a 10 to 15 degree from the horizontal. Tilting stratification is conducive to filling roof and ore transport, but rock drilling and support are not as convenient as horizontal stratification.

(3) The ore block no longer divides the mine and the pillar, but a step back mining.


(2) Components of the ore block:

(1) Stage height - 30 to 50 meters;

(2) Length of the nugget - 30 to 50 meters;

(3) Nugget width = ore body horizontal thickness;

(4) pillars - no flow tops, bottom columns;

(3) Mining block mining work

(1) Stage transport lanes are arranged in the lower disc contact belt or the lower disc rock.

(2) Patio - placed in the lower plate contact zone; (One nugget has three patios, one pedestrian ventilation well is arranged at each end of the nugget, and one flow mine is in the middle). 1 Pedestrian ventilation wells – with the decline of mining stratification, are gradually replaced by ten concrete wells built in the filling. 2 Flowing mines – gradually disappearing from top to bottom. )

(4) Cutting work

Before each layer is recovered, a cutting lane must be drilled along the lower belt contact belt. If the ore body is irregularly contoured or has a large thickness, the cutting lane can also be placed in the center of the ore body level.

(5) Mining work

(1) Mining mode - There are two ways of mining, one is the way of mining, and the other is the division of the mining. The roadway mining is to carry out roadway mining at a full level of stratification. These mining roadways are called recovery roads.

(2) Mining stratification - the mining stratification height is generally 2 to 2.5 to 3.0 meters, and the width of the approach is 2 to 2.4 to 3.0 meters. Rock drilling with a 01 to 30 or YT-25 rock drill with a hole depth of 1.6 to 2.0 m. The ore is transported by electric pick-up, and the foreign trade uses the loader and transporter to transport the ore. The access is mostly supported by wooden sheds.

(6) Filling work.

(1) Preparation before filling - cleaning the floor, laying reinforced concrete slabs, nailing the insulation layer, constructing dehydrated sand doors, etc.

(2) Filling - formal filling work can be carried out after the preparation work is completed.

(3) Note: 1 In order to connect well, the filling pipe should be tilted to the top plate by about 5°. 2 The outlet of the filling pipe should not be more than 5 meters away from the place to be filled. The dewatering sand door is located at the junction of the cutting alley and the pedestrian patio.

When the filling work of the layered cutting lane is completed, the next layer of mining can be started.

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