Sectional mining method of a copper mine in Zambia
A copper ore deposits generally Zambia strip output, the average thickness of 8m, angle 30 ° ~ 90 °, generally about 40 °. Both the ore body and the surrounding rock are relatively stable.
The stage height is 40 to 60 m, and the stage is divided into three segments with a height of 15 to 20 m.
In the segment, the ore block is divided along the strike. The length of the mine in the ore block is 30-40 m, the width of the column is 6 m, and the thickness of the inclined column is 5 m.
The stage transportation lanes, section roadways and most of the cutting roadways are arranged outside the veins, and they are connected by ramps to drive the trackless self-equipment. Digging into a mineway every 100m along the way.
Figure 1 Schematic diagram of the mining and cutting work of the sub-section mining method
1-segment transportation laneway; 2-loading roadway; 3-ditch bottoming roadway; 4-rocking roadway;
5-segmented vein roadway; 6-segmented veined roadway; 7-spindle rock chamber;
5-segmented vein roadway; 6-segmented veined roadway; 7-spindle rock chamber;
8-top column rock drilling chamber; 9-cut patio; 10-open cutting groove blasthole; 11-back mining room blasthole;
12-open V-shaped trench blasthole; 13-recovery blast hole; 14-recover oblique apex blasthole
The cutting work in the section is shown in Figure 1. The subdivision transport lanes and the loading lanes are drilled horizontally in each section, and then the extravehicular trenches are arranged at the design location of the trenches and the cutting patios, according to the advantages. In the mining room and pillar mining principle, the mining roadway is arranged in the upper part of the section roadway, thereby digging a cutting roadway leading to the mining room and adjacent to the column and a rocking roadway near the upper plate, in close proximity In the surrounding rock of the column, the rock chamber is drilled into the column, and on the side of the mining roadway, the rock drilling chamber of the inclined roof column is excavated.
In order to form the cutting trough, the cutting patio is drilled from the trench bottoming roadway, and the top of the cutting section of the connected pavement should be located at the highest point of the section, and then used as a free surface to drill up and down in the sectioned vein crossing roadway. Deep holes (see Figure 1I-I), which are sequentially blasted to form a diamond-shaped cutting groove.
The mining recovery is carried out from the cutting groove to one side. The ore deposit is to drill a circular deep hole in the rock drilling roadway, and to make an upward fan-shaped blasthole in the trench bottom roadway, as shown in Fig. 1II-II, and simultaneously blast to form a V-shaped trench at the bottom of the mine house. The ore transportation is carried out in the loading lane, and is transported to the sloping mine in the section roadway with a 3.8 m 3 scraper. After the mine is harvested, it is returned to the mining column. In the mining column, several rows of fan-shaped deep holes are drilled in the indoor rock drilling chamber, and the inclined top column is recovered. The fan-shaped beam-shaped deep hole is drilled in the rock chamber of the top column. The column and the inclined column are simultaneously blasted.
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