The average thickness of the ore body is 8 meters (⊥ thickness);

The ore body inclination angle is 30°～90°; the ore and surrounding rock are relatively stable.

The ore body is a long strip of copper deposits.

(2) Elements of the nugget

1 stage height - 40 to 60 meters;

2 Each stage is divided into three sections with a section height of 15 to 20 meters;

3 Each section is divided into a mine and a pillar, and the mine is 35 to 40 meters along the strike;

It is 25 to 45 meters long along the slope and 6 meters wide.

The inter-segmented chiseled top column has a true thickness of 5 meters.

(3) Approved work

(1) From the stage of transporting the roadway to dig the ramp, so that the sections can communicate with each other, and can drive the equipment and materials of the trackless equipment and the trackless vehicles.

(2) Drainage and boring wells – every 100 meters along the strike, a mine-boring well is drilled, and the chute is connected to each section of the transport lane.

(3) Segmented transport flat roads – each section level excavates a section of transport lanes outside the lower disc.

(4) Loading and arranging the roadway—digging a loading and traversing lane every 13 meters from the section of the transportation lane.

(5) Mining pillars and mining roadways—excavating the pillars in the upper part of the section transportation lanes.

(6) Rock drilling and hoisting - drilling and boring in the vein near the upper plate.

(7) The inter-column rock drilling chambers are all excavated outside the lower disc.

(8) The top column rock drilling chamber is excavated outside the lower disc.

(4) Cutting work

(1) Cutting the cross-road – dig the cutting cross-section on one side of the mine, so that the rock-drilling roadway and the pillar-collecting roadway are connected.

(2) Cutting the patio – dig the cutting patio from the top of the trench road to the section of the mine.

(3) Ditching and digging the bottom of the road - the loading and traversing lanes are connected with the sloping and sloping flat roads, and the sloping bottoms are digged in the lower part of the ore body.

(4) Formation of cutting vertical groove - drilling a circular deep hole in the cutting cross-section, cutting the patio as a free surface, and forming a cutting groove after blasting.

(5) Mining work

(1) From the cutting groove to the other side of the mine, carry out the mining work, and make a circular deep hole in the rock drilling alley.

(2) In the trench down the flat alley, the fan-shaped blasthole is drilled, and the upper recovery blasthole is simultaneously blasted.

(3) The ore that has fallen down is transported from the loading and traversing lane with a 3.8 ^m3 scraper to the nearest chute in the section transportation lane, and slipped into the stage transportation lane to be loaded and transported.

(6) Pillar mining and empty area treatment

When a mining house is finished, immediately pick up the side column and the inclined top column on one side.

(1) The deep hole rock drilling chamber of the mining column is arranged on the side of the cutting crossway to the lower plate.

(2) The deep hole rock drilling chamber of the inclined top column is dig, and the side of the mining column is excavated, corresponding to the central part of the mining room.

(3) The order of returning to the mining column is to first blast the column and release the collapsed ore before blasting the top column. When the top column is blasted, most of the ore that has collapsed from the top column slips into the trench and is released due to the external force throwing action.

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