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Method for open extraction of steep-falling deposits with internal dump-forming

IPC classes for russian patent Method for open extraction of steep-falling deposits with internal dump-forming (RU 2246620):

E21C41/26 - Methods of surface mining (machines for obtaining, or the removal of, materials in open-pit mines E21C0047000000); Layouts therefor

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FIELD: mining industry.

SUBSTANCE: method includes dividing quarry on rows, of which first one is extracted to planned depth with external dump-forming, and extraction of following rows is performed with use of internal dump-forming, placing dug rocks to extracted space of adjacent row with common displacement of dump front with development of mining operations. Second and following rows of quarry are divided on basis of height on extraction levels, extraction of uppermost level is performed with placement of dug rocks in upper dump level of extracted space of adjacent row, using surface transporting communication lines, and during extraction of second extractive level dumping of dump level of inner dump is primarily performed by forming pioneer dump at longitudinal processed edge of quarry, on upper area of which transporting lines are placed and dumping of dump level is performed from there, with descent of mining operations in working area of extractive level profile of upper dump area is altered to provided necessary cargo communications of working horizons of extractive level to dump level, after extraction of extractive level remaining pioneer dump is dug to upper mark of following extractive level, and extraction of following extractive levels is performed analogically, using reformed upper area of pioneer dump.

EFFECT: higher efficiency.

10 dwg

The invention relates to an open development of mineral deposits, and more particularly to an open development crotophaga fields with the use of internal reserves.

The known method [1] open pit steeply sloping fields with the use of internal reserves.

Mining with this method begins with the construction of the career of the first stage at full depth with moving waste rock in external dumps. After creating the career of the first stage is transferred to the second stage is to conduct operations in the career of the second stage. Mining activities begin to develop in the direction of the end throughout the depth. In backordered developed space create internal dump, which develop after podvigina ledges working Board. This blade in place further overburden. Transportation of the mineral and overburden in the system with internal stacking produced by road transport. Freight transportation communication working Board with layers of inner blade carried out by the transport berms located on one of the longitudinal outside of the pit.

On the same Board is satisfied with the internal semi conventions for delivery to the surface of the fossil. In the case where the height of the shaft tier exceeds the height of the ledge, these conventions will also be used for freight transportation communications workers of ledges with tiers of the blade. Prestaciones congresses due to the fact that as podvigina front works congresses flooded inland dumps. Therefore, transport outside of the Board to replace retiring new semi congresses. The life of a semi congresses at various horizons varies: in the upper horizons new conventions create through 1-1,5 years, on the bottom after 6-8 months.

However, due to the large additional volumes of Stripping on the device exposing openings, this method is not used in the development of steep deposits. Its scope is limited to relatively shallow occurrence of a useful mineral, when the angle of incidence equal to or less than the angle of maturity transport pit, or when a constructive angle side more angle on the conditions of sustainability.

The closest technical solution is the way to develop steep deposits queues using internal stacking [2]which career field is divided by the length of the queue. The first and foremost being the full depth and hauling waste rock to external dumps. The opening of the first stage is the capital of trenches mixed the CSOs of inception: two or three of the upper horizon opened trenches external location and the lower horizons - trenches internal laying. After testing the first stage of the work included the adjacent turn, adjacent to the worked-out space of the first stage. The second stage is being moved overburden in the mined-out area of the first stage.

Opening business horizons and their freight transportation bond with the surface and internal tiers of the blade through capital tranches internal laying, have repaid the longitudinal outside of the pit. The number of inclined revealing the workings, providing freight transportation communication business horizons to the surface is greatly reduced.

However, the known method has a significant drawback. It is that for freight transportation communication business horizons with layers of internal dump device must transport sites on redeemable Board career. The device transport sites on Board the career associated with additional spacing Board, with significant additional volumes of Stripping operations. For example, a device in a career of only one transport platform width of 30 m at a distance of 200 m from the surface leads to additional volumes of overburden 6 million m³one kilometer length career. A simple division of career in very difficult conditions is a single system with internal stacking and consistent practice does not provide a significant reduction of additional volumes of overburden for the device exposing openings.

The invention solves the problem of reducing the volume of overburden in the pit in an open development steeply dipping deposits with internal dumping division career in length, at least two stages, development of the first phase project on the depth and movement of the Stripping of the second stage in the mined-out area of the first stage.

The technical result to be obtained by use of the invention is to reduce the number of transport sites on redeemable Board career, providing freight transportation communication business horizons, second stage with layers of internal dump, located in the mined-out space of the first line.

This technical result is due to the fact that in the known method of surface mining of steeply dipping deposits with internal dumping, in which the pit length is divided into a queue from which the first practice to the design depth with external stacking, and the development of the subsequent turns are using internal dumping, placing Stripping in the mined-out area adjacent queue with General podvigina dump front as the development of mining operations, the second and subsequent queue career divided by the pitch extraction stages, the development of the upper tier are with the size is the incarnation of overburden in the upper waste layer adjacent goaf line, using transport communication surfaces, when performing a second extraction layer filling the dump tier inner blade originally performed by forming longitudinal repaid the pit pioneer of the mound, on the top floor which place transport communications and lead her dumping dump tiers at least reduction of mining operations in the work area excavation tier change the profile of the upper platform mounds, providing freight transportation communication business horizons excavation tier with otvajnym tier, after longwall tier remainder pioneer embankment work up to the upper mark of the next extraction layer, and the subsequent development of the mining of tiers carried out in a similar way, using the newly-formed upper deck pioneer the embankment.

This set of essential features of the proposed method will reduce the amount of Stripping activity associated with the additional spacing of the pit for transport sites, providing freight transportation communication business horizons excavation layers of the working zone with final tiers.

The method is illustrated in the drawings, in which figure 1, 2, 3 shows the position of mining operations at the time of internal dumping in the known method of amrabat and, when opening working horizons and their freight transportation bond with the surface and internal tiers of blade carried out by capital tranches internal underlay, available on redeemable outside of the pit, at the 4 - position of mining operations in the claimed method at the time of testing of the first stage career at the design depth and design career paths of the second stage and excavation layers; figure 5 - position of mining operations at the time of testing the upper excavation tier of the second stage career with the placement of overburden in the first place career; at the 6 - position of mining operations at the end of the formation of the longitudinal repaid the pit pioneer mounds of overburden second excavation tier, 7, 8, 9 - position of mining operations in the second extraction layer including intermediate profiles the top platform pioneer embankment, providing communication business horizons second extraction layer with the second otvajnym tier; figure 10 - position of mining operations at the end of the operation of the remaining part of the pioneer of the mound within the elevations of the second extraction stage and the beginning of the testing of the third excavation of the tier.

In the known method the development of steep deposits with internal dumping (see figure 1) pit length is divided into two ocher is di. First career 1 work to the design depth with the placement of overburden in external dumps (not shown). The second stage 2 work with the placement of overburden waste in tier 3, placed in mined-out space of the first stage 1. In this method, the redeemed Board career for the implementation of the freight transportation communication business horizons with final tiers should arrange transport platform 4 and further separation of pit 5.

The inventive method is as follows. The length of the pit is divided into several queues (in the drawings shows the division into two stages. First career run at full depth with the movement of the rock mass in external dumps (not shown).

After creating the career of the first stage 1 begin to develop mining operations in the career of the second stage 2, which fulfill at least two extraction stages. In the drawings shows an example of practicing the second stage four excavation tiers 6, 7, 8 and 9 (see figure 4). The upper mining level 6 work with the transverse movement of the front work with the placement of the upper overburden excavation layer of the upper conveyor tier 10 goaf first stage, using transportation surface (see figure 5). When developing the second veemon the tier 7 filling the dump tier inner blade originally performed by forming longitudinal repaid Board 11 career pioneer mound 12, on the upper platform 13 which place transport communications and lead her dumping waste layer 14 (see Fig.6). As the reduction of mining operations in the work area excavation tier 7 change the profile of the upper platform 13 of the embankment 12, providing freight transportation communication business horizons excavation tier 7 with otvajnym tier 14 (Fig.7). The maximum slope of the profile of the upper platform 13 (or part of it in broken form) must not exceed the maximum allowable under the terms of transport. After longwall layer 7 remains part 15 pioneer mound 12, which work up to the upper level 16 of the next excavation stage (in our case tier 8). When triggered remaining within elevations excavation tier 7 parts pioneer mound 12 newly formed upper space 17 pioneer mound 13, at which place transport communications and use it for filling the next dump tier (see figure 10). Testing subsequent extraction stages operate in the same way.

The claimed method provides compared to prototype a significant decrease in the volume of overburden contours career. So, for a career with average conditions, this reduction may be 15-20 million³for every 1000 m of its length. In addition, the inventive method provides transportation is scrushy inner blade shortest distance due to the fact, that pioneer mound in the process of doing work all the time is immediately adjacent to the working ledges excavation tiers.

Sources of information

1. Tumakov P.I. System coal seams with internal dumping. New directions in engineering and technology surface mining: Str., M, MILAM, mineral resources, 1965, p.67-93.

2. USSR author's certificate No. 337516, MKI E 21 41/00, 1972 (prototype).

Method of surface mining steeply dipping deposits with internal dumping, in which the pit length is divided into a queue from which the first practice to the design depth with external stacking, and the development of the subsequent turns are using internal dumping, placing Stripping in the mined-out area adjacent queue with General podvigina dump front as the development of mining operations, characterized in that the second and subsequent queue career divided by the pitch extraction stages, the development of the upper tier are with the placement of overburden in the upper waste layer adjacent goaf queue using transport communication surfaces, when performing a second extraction layer filling dump tier inner blade originally performed by forming longitudinal repaid the pit pioneer of the mound, on the top of the it platform which place transport communications and lead her dumping the dump tier, as the reduction of mining operations in the work area excavation tier change the profile of the upper platform mounds, providing freight transportation communication business horizons excavation tier with otvajnym tier, after longwall tier remainder pioneer embankment work up to the upper mark of the next extraction layer, and the subsequent development of the mining of tiers carried out in a similar way, using the newly-formed upper deck pioneer of the mound.