Method to develop edge ore bodies with unstable ores

FIELD: mining.

SUBSTANCE: invention relates to mining industry and may be used in development of thick edge ore bodies with unstable and precious ores, for instance, kimberlite pipes, by the underground method. The method includes formation of man-made massif with tunnelling and filling of stopes at the cut and undercut layer, descending extraction of reserves under the man-made massif and filling of the mined space. Under the man-made massif they form a transition layer-sublevel by alternate tunnelling of the stopes of the first phase, with height equal to the height of the layer, and stopes of the second phase, the height of which is equal to the height of the layer-sublevel, at the same time the stopes of the first phase is given the shape of the tilted trapezoid in the vertical cross section, and stopes of the second phase - the irregular hexagon, besides, the width of the upper bases of figures of these stopes and width of stopes of the above (undercut) layer are accepted with equal value. Reserves of the deposit below the transition layer-sublevel are mined by chambers in staggered order with a shift to a sublevel. Chambers in the cross section are given the shape of the hexahedron extended along the vertical line. The upper part of the chambers is formed in the form of a trapezoid with size of half of chamber height, the contours of the upper base of which match the contours of the base of the filled stopes of the first phase in the transition layer - sublevel, and contours of the lateral upper sides - with contours of the lower sides of the filled adjacent stopes of the second phase. The lower part of the chamber with the size of half of its height is given the shape of the tilted trapezoid in the vertical cross section.

EFFECT: invention makes it possible to increase intensity of mining of ore deposits, to increase size of an extraction unit and to reduce costs for filling works.

5 cl, 2 dwg

 

The invention relates to the mining industry and can be used in the development of underground powerful steeply dipping ore bodies with fragile and valuable ores, such as kimberlite pipes.

There is a method of kimberlite pipes under elastic panels, including the division of the ore body on the floor, and the floors of the blocks, the sinking of the ventilation-way roadways and ore chutes, the elastic mounting of the shields and mechanized complexes in blocks, the extraction of ore in units of horizontal layers with the use of combine harvesters, transport ore conveyors under elastic panels (Patent RF №2242611, CL IS 41/22, 2003).

The disadvantage of this method is the large intensity of the elastic mounting of the shield, mounting and remounting at the transition to the underlying layer of the mechanized complex. Furthermore, the presence of the collapsed array of overlapping species on the elastic shield eliminates parallel mining of ores other floors (panels), which dramatically reduces the performance of the mine in General.

Also known how to develop powerful steeply dipping ore bodies, including the blasting of the ore body from top to bottom blocks rhomboidal shape shifting them relative to each other by half of the floor, the mined-out space (RF Patent 2093678, CL IS 41/22, 1997).

To the disadvantage of ways is as follows: the difficulty in forming the upper part of the frame shape; the acute angle in the design of the upper part of the block is invariably hub considerable stress, and the development of transport and drilling excavations in unstable ores will require a high cost of their support and maintenance.

Closest to the proposed invention the technical essence is a way of development of ore deposits, including the penetration grade of the parallel faces of the first stage and between the driving faces of the second phase with the displacement of the soil above the soil benches of the first stage, the formation of an artificial roof of the mined-out space benches, excavation of minerals under artificial roof and the mined-out space (A.S. USSR №1346793, CL IS 41/06, 1987).

The main disadvantage of this method is the formation of the roof of the cameras in filling array of stepped form, due to the different heights of the soil benches first and second stage. When the blasting chamber ore reserves is chipping in the camera tab from soil benches second phase, which leads to the dilution of ore backfill material. When developing a powerful fields of this technology for each subsequent floor it is necessary to generate synthetic roof laid down by the benches, which is time consuming and leads to a decrease in the intensity of otrb the TCI as a whole.

Technical problem on which the invention is directed, is to increase the intensity of ore deposits, by increasing the size of excavation units and reduce the costs of backfilling operations.

This result is achieved in that in the method of developing a powerful steeply dipping ore bodies with unstable ores, including the formation of artificial array-excavation and laying of the benches on split and podrastet layer, a downward cut stock under artificial array and the mined-out space under artificial array form a transition layer-substage by alternately sinking benches of the first stage of a height equal to the height of the layer, and benches of the second stage, the height of which is equal to the height of the layer-substage, and the benches of the first stage of give in the vertical sectional shape of an inverted trapezoid, and the benches of the second phase of a hexagon, and the width of the upper base these figures benches and width of benches overlying (podrostkovo) layer take equal values, then the reserves below the transition layer-substage work out the cameras in a checkerboard pattern with offset on the substage, in cross section which give the appearance of a hexagon, extended vertically, with the upper part of the chambers form is in the form of a trapezoid with dimensions half the height of the camera, the contours of the upper base of which coincide with the contours of the ground faces of the first stage in the transition layer substage, and the contours of the lateral upper sides with the contours of the bottom sides laid adjacent faces of the second stage, the lower part of the chamber, the size of half of its height and attach to the vertical sectional shape of an inverted trapezoid. The drilling benches second stage layer-substage made from benches podrostkovo layer, using them as drilling production. After testing of ore reserves in the second section turns its tab carried out simultaneously used as drilling production section podrostkovo layer. The upper half of the cameras work under filling the array, and the lower - grade ore, and the angles of inclination of the lateral walls of the upper half of the camera of the backfill material and the side walls of the ore, the lower half of the camera, have equal values. Treatment chamber after testing is not less than 2/3 of their height lay hardening the mixture.

Non-pledged portion of the treatment chamber is used for the implementation of ventilation in the development of adjacent treatment chambers.

The invention is illustrated by drawings, where

figure 1 - shows the projection on the vertical plane of the circuit testing layers, benches and cameras, longitudinal section;

figure 2 shows the l the hydrated section along the line A-A.

On the drawing (Fig. 1 and 2) depicts the floors and zagadki split layer - 1; Zachodni podrostkovo layer - 2; Zachodni the first stage of the transition layer-substage - 3; Zachodni the second stage of the transition layer-substage - 4; fans down-hole - 5; drilling generation (Zachodni podrostkovo layer - 2) - 6; repulsed ore - 7; self-propelled machine with remote control - 8; camera hexagonal shapes - 9; drilling generation, passed in the roof of the chamber 10.

The inventive method is carried out as follows.

Throughout the area of the ore deposits create an artificial array of backfill material through bookmarks benches split layer 1 and podrostkovo 2. Under artificial array form a transition layer-substage by alternately sinking benches of the first stage 3 of a height equal to the height of the layer, and benches of the second stage 4 of a height equal to the height of the transition layer of the substage. Testing and bookmark benches of the first stage 3 are laid under the benches podrostkovo layer 2 full cross-section having the shape of an inverted trapezoid. Then work out Zachodni second stage 4, the cross section of which is presented in the form of a hexagon. The breaking of ore carried out by the fans down-hole 5. As drilling openings 6 for blasting of ore in the approaches of the second phase of the transition layer of the substage use Zachodni p is disretnogo layer 2, located in the roof of the benches of the second stage 4 transition layer - substage, which for this purpose shall retain the non-pledged. Repulsed ore 7 with soil removed self-propelled vehicles with remote control 8, and after full testing of each Zachodni second stage 4 put it together with drilling production 6.

As the formation of the transition layer - substage pass to the improvement of the basic inventory deposits. Mining of ore in the floor exercise cameras hexagonal form 9 in a checkerboard pattern with offset on the substage. Training and testing chambers 9 are similar to the benches of the second stage 4, only the breaking of ore carried out by the fans down-hole - 5, oboronnyi of production drilling, completed in the roof of the camera 10. Mining top-down. Sewage treatment works in the chambers 9 floors lead behind two chambers on the lower floor, as shown in figure 1. The upper part of the chambers 9 formed in the form of a trapezoid, the contours of the upper base of which coincide with the contours of the bottoms laid benches of the first stage 3 in the transition layer substage, and the contours of the sides (walls) with two paths laid adjacent faces of the second stage 4. Keystone (close to the arched shape of the upper part of the camera 9 is the most stable form of manifestation of high rock pressure. The side walls of the lower part Kamer, located in the ore array, perform inclined towards the bottom than eliminate peeling and the wood thrown in her treatment of space. After working chamber 9 lay hardening bookmark not less than 2/3 of their height. Non-pledged portion of the treatment chamber 9 is used to implement the ventilation in the development of adjacent treatment chambers.

The application of the proposed method of mining steeply dipping ore bodies with unstable valuable ores allows you to increase the intensity of mining at the expense of increasing the size of the excavation units and to reduce the cost of backfilling operations.

In addition, the proposed method of forming a transition layer - substage provides a safe transition from layer extraction unstable valuable ores chamber to a development system with the use of self-propelled equipment of higher capacity. The formation of the upper part of the chambers in the form of a trapezoid attached to the roof of the camera steady, which has a positive effect on the security maintenance of the treatment works. Practicing cameras hexagonal shape in a checkerboard pattern with offset on the substage allows you to bookmark cameras hardening the mixture to 2/3 of their height, thereby reducing the cost of stowing up to 20-25%. The use of non-pledged portion of the treatment chamber for ventilation in the development of the neighbouring sewage treatment Kama is, reduces the volume of mining operations.

Only the application of the proposed method when designing underground kimberlite ore Yakutia will allow a 1.5 fold increase production efficiency and 20-25% reduction in the cost of backfilling operations.

1. Method development steeply dipping ore bodies with neustoichivii ores, including the formation of artificial array-excavation and laying of the benches on split and podrastet layer, a downward cut stock under artificial array and the mined-out space, characterized in that the artificial array form a transition layer-substage by alternately sinking benches of the first stage of a height equal to the height of the layer, and benches of the second stage, the height of which is equal to the height of the layer-substage, and the benches of the first stage of give in the vertical sectional shape of an inverted trapezoid, and the benches of the second phase of a hexagon, and the width of the upper base shapes of these benches and the width of the benches overlying podrostkovo layer take equal values, then the reserves below the transition layer-substage work out the cameras in a checkerboard pattern with offset on the substage, in cross section which give the appearance of a hexagon, extended vertically, with the upper part of the chambers formed in the form of a ladder is the size of half the height of the camera, the contours of the upper base of which coincide with the contours of the ground faces of the first stage in the transition layer substage, and the contours of the lateral upper sides with the contours of the bottom sides laid adjacent faces of the second stage, the lower part of the chamber, the size of half of its height gives the vertical sectional shape of an inverted trapezoid.

2. The method according to claim 1, characterized in that the drilling benches second stage layer-substage made from benches podrostkovo layer, using them as drilling output.

3. The method according to claim 1, characterized in that after the development of the reserves of ore in the second section turns its tab carried out simultaneously used as drilling production section podrostkovo layer.

4. The method according to claim 1, characterized in that the upper half of the cameras work under filling the array, and the lower - grade ore, and the angles of inclination of the lateral walls of the upper half of the camera of the backfill material and the side walls of the ore, the lower half of the camera, have equal values.

5. The method according to claim 1, characterized in that the treatment chamber after testing is not less than 2/3 of their height lay hardening mixture.



 

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