Nugget structure parameters of stage mining method

The ore structure parameters of the stage mining method depend on the stability of the ore, the characteristics of the ore body, the type of deep hole drilling rig, the type of mining equipment and the different schemes of the stage mining method.
When the horizontal deep hole stage mining method is adopted, the structural parameters of the ore block are: the stage height is 60-80 m; the length of the mine house arranged by the rock strike is 20-50 m; the width of the vertical house is 10~30 m; the width of the column 10 ~ 15m, the thickness of the top column is generally 6 ~ 8m; the height of the bottom column: the bottom structure of the funnel is 8 ~ 13m, the structure of the flat bottom is 5 ~ 8m.
When the vertical deep hole stage rock drilling stage mining method is adopted, the stage height is 50-60m; the mining room is arranged along the strike, 50~70m long and 15~20m wide; the vertical direction of the mining room is 15~20m wide and 25~ long. 40m; the bottom is mostly flat-bottom structure, the height of the bottom column is 6~8m; the thickness of the top column is 6~8m; the width of the column is 8~12m.
When using the vertical deep hole section rock drilling stage mining method, the stage height is 50-60m; the section height is 10~12~15m; the length of the mine is 30~50m; the width of the column is 8~12m; the height of the top column is 5~ 6m; the bottom column is 10 to 13m high.
When the large-diameter vertical deep-hole stage mining method is adopted, the stage height is 60-70 m; some 80-110 m; the length of the mining house is 30-60 m; the width is 18-25 m; the top column is 10-15 m thick; the bottom column is generally a flat-bottom structure. .
For the allowable exposed area of ​​the stage mining method, the empirical data can be used, as shown in Table 1.
Table 1 Phase domestic metal mine ore stope method allows an exposed area (m 2)

Rock mass exposure location

Ore stability

Rocks are stable

The ore is very stable

Stable rock

The rock is very stable

Rock on the plate

Ore roof

1500~2000

>800

2000~2500

800~1000

2500~5000

1500~1800

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