1) Nugget layout:
Generally, when the ore body is thicker than 20-30 meters, the ore blocks are arranged along the strike direction. When the thickness is greater than 20-30, the ore blocks are cut and arranged.
[Reference content]: When the ore is arranged along the strike, the ore of the mine can account for 50% to 70% of the ore deposit, and the amount of mining and cutting engineering is also relatively small. The amount of housing ore only accounts for 40-50% of the ore deposit. Therefore, as long as the stability of ore and surrounding rock is allowed, it should be arranged along the strike as much as possible. However, since this method is more suitable for thick ore bodies, the ore blocks are mostly arranged by cutting.
2) Stage height - For this type of scheme, the stage height is relatively large, generally about 60 to 80 meters. Increasing the stage height can increase the mine's ore volume, reduce the proportion of the top and bottom column ore, and at the same time reduce the stage picking work and cutting work.
(The stage height can be larger because it falls horizontally, rock is drilled in the patio, in the diverticulum, and is not limited by the ability of the rock drilling equipment).
3) The length of the mine – generally 20 to 50 meters (when it is arranged along the strike) (when the strike is arranged, the length of the mine = the thickness of the ore body).
[Reference]: The length of the mine is affected by the stability of the rock, the allowable exposed area and exposure time, the inclination of the ore body, and the length of the mine is also affected by the orientation of the ore body and the fault, and the rock drilling equipment used. , the impact of moving equipment.
4) Width of the mine – When the ore is cut and arranged, the width of the mine is generally 10 to 30 meters. When the ore block is arranged along the strike, the mine is wide = the thickness of the ore body.
[Reference] In addition to the allowable exposed area, ore body thickness, and nugget height, the width of the mine is also related to the arrangement of the deep holes, the area of ​​the funnel and the order of the mining. If the mine is pushed from the upper plate to the lower plate and the surrounding rock is exposed for a long time, the width of the mine should not be too large; if it is recovered from the center of the mine to the two plates, the width of the mine can be larger.
5) Pillar size:
1 column width - typically 10 to 15 meters.
The reserves of the column account for about 15 to 35% of the total ore reserve and are subject to most of the rock pressure, so it must have sufficient strength.
[Reference] The size and strength of the inter-column depends on the strength of the ore, the pressure of the surrounding rock, the thickness of the ore body and the dip angle of the ore body, the height of the nugget, the recovery time of the inter-column, and the method of mining the inter-column. In addition, consideration should be given to whether the roadway is opened in the column and the effect of deep hole blasting in the mine. The general experience is that the width of the column should not be less than three times the minimum resistance of the deep hole. (The minimum resistance line for horizontal deep holes is 2.5 to 3.5 meters). The column width is >3W.
The thickness of the top column - the thickness of the top column is generally between 6 and 8 meters.
The thickness of the top column is determined by the duration of the top column, the strength of the ore, the thickness of the ore body, and whether the column is open in the top column.
3 The height of the bottom column – the height of the bottom column depends mainly on the form of the bottom structure used.
The height of the bottom column with the bottom structure of the funnel is about 8 to 13 meters;
The height of the bottom column without the funnel bottom structure is about 5-8 meters;
[Reference content]: The main factors affecting the components are:
1 Stability of ore (permissible exposed area)
2 The stability of the pillar and the method of mining the pillar (the condition of the pillar is very poor, so when determining the size of the pillar, it is required to increase the size of the mine as much as possible and reduce the size of the pillar.)
3 Relevant to the mining equipment used.
4 is related to the intensity of mining.
Road Racing Tyre,Bicycle Tyre 24 Inch,Rubber Content Bicycle Tyre,Fat Bicycle Tyre
Jiangyin Estone Trading Co.,Ltd. , https://www.estonerubber.com