Nugget structural parameters of stage forced collapse mining method

The height of the stage is generally 50m, the inclination angle of the ore body is 40~50m, and the inclination angle of the ore body is 60~70m when it is steep.
The horizontal size of the nuggets has two arrangements depending on the thickness of the ore body. One is when the thickness of the ore body is less than or equal to 30m, the ore block is arranged along the strike direction, the length of the ore block is 30-45m, the width of the ore block is equal to the thickness of the ore body; the second is when the thickness of the ore body is greater than 30m, the vertical block of the ore block is arranged. The length and width of the nuggets are 30 to 50 m.
The height of the bottom column is related to the structure of the bottom column, the stability of the mining equipment and the rock, and is generally 12 to 14 m.
The distance between the electric roadway and the funnel (or ore roadway) is mainly determined according to the optimal value of the ore loss depletion in the ore mining process.
The structural parameters of the forced caving method in some mines in China are shown in Table 1.
Table 1 Structural parameters of the stage forced collapse method

Mine name
Mining law name
Mining equipment
Mine roadway direction
Stage height (m)
Nugget width (m)
Nugget length (m)
Bottom column height (m)
Funnel spacing (m)
Funnel or loading lane spacing (m)
Remarks
Dexing Copper Mine
Forced caving method in horizontal deep hole mining stage
Electric pick
Vertical panel trend
60
32
40
16~18
7
16
Taolin lead zinc ore
Forced caving method in horizontal medium-deep hole mining stage
Electric pick
Along the ore body
40
20 (average)
50
12
5
10
Yimen Copper Mine Fengshan Mine
Forced caving method in horizontal deep hole mining stage
Vibrating miner
Vertical ore body trend
50
15~30
30~50
8
7~8
15
Load directly with a 2.0m 3 mine car
Dexing Copper Mine
Forced caving method for vertical upward and deep hole ore mining
Electric pick
Vertical ore body trend
60
15.2
40
16
5~6
15.2
Copper ore
Forced caving method for vertical upward and deep hole ore mining
scraper
Vertical ore body trend
60
16
90~100
15
12
16
Yangjiazhangzi Ridge former tin mine
Forced caving method in the falling chamber of the drug room
Electric pick
Vertical ore body trend
35
30
>30
7
6.5
15
The mine drainage well is connected to the electric roadway by the next stage

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