Method of development of steep ore body

FIELD: mining.

SUBSTANCE: invention refers to mining, particularly to development of steep ore bodies by underground method. After driving workings of discharge along the center of the block there is arranged a recess on thickness of the ore body transversely to the strike of deposit. Descending complexes of boreholes are drilled from the recess with symmetrically arranged horizontal bores in a hanging layer of the ore body parallel to the plane of ore body occurring. Drilling, charging and blasting of bores is performed stage-by-stage in the upward direction leaving a temporary massif of height h; further descending fan-like complexes of bores are drilled in the temporary massif, then they are charged and blasted. After each cycle of drilling, charging and blasting partial discharge of muck is performed. Then a canopy is formed in a hanging wall of the ore body by means of filling the produced space with hardening backfilling material through the recess; when the material has hardened, under protection of the formed canopy there is performed working of the block store; also height h of the temporary massif is accepted as minimal radius Rmin of a boring rod curve.

EFFECT: reduced impoverishment at working chamber stores; increased efficiency of block during mining excavation and reduced general labour intensiveness at working of chamber stores.

7 dwg

 

The invention relates to mining, in particular to the development of steep ore bodies underground.

The known method development steeply lived complex morphology (RF patent No. 2187645, AS 41/22, publ. 2002.02.19). The method includes carrying out haulage drift, rising block, mining ore inclined layers, its partial magazynowania, issue nerazreshimaya ore in a mining space through the ore passes. When designing lived with unrestrained power uprising mining of lead ore in two polyblock with increasing Central rising. In the areas of reducing power wires below the minimum width of the treatment space tamakaimoana hard ore is placed to overlap and produce selective dredging, smitten rock leave in polarlake. In areas of mining veins with the power corresponding to the minimum allowable width of the treatment space and over on smitten rock stack permanent flooring, and place of the coupling constant of the deck with the ore passes are installing the exhaust hatch. The disadvantage of this method is the high complexity of the operations of the method associated with use makesurvey blasting, and low productivity in the period of sewage extraction, involving the need of magazynowania ore in the block.

The known method is asrabadi steep ore bodies, adopted for the prototype (patent RF №2052111, AS 41/22, publ. 1996.01.10). At the same time amerivault all stocks of the substage and stocks of poor ore. While wells used for blasting of rich ore, not amerivault to the bottom sublevel pillar, and wells used for blasting poor ore, drilling to the full height of the substage. Rich ore discourage in the first place. Repulsed rich ore is removed from the foot of the pillar, then beat stocks of poor ore. Release repulsed poor ores of lead from all podathey at the same time. The disadvantage of this method is the high dilution of the ore with the release of rocks hanging side and low productivity during the period of sewage extraction, involving the need of magazynowania ore in the block.

The technical result of this method is improving the performance of the unit during the period of sewage extraction and reduced dilution of ore rocks hanging side by creating overlap.

The technical result is achieved in that in the method of designing cool ore bodies, including the sinking of the preparatory and development workings, drilling reserves the floor to the bottom of the pillar, loading and blasting holes, magazynowania ore, the issue of broken ore from the block through the production of release, according to the invention after working driving issue in the center of the block creates a niche for power PN is tion of the body transverse to the extension, Buryats from her descending sets of wells symmetrically arranged with horizontal holes in the hanging side of the ore body parallel to the plane of the occurrence of the ore body, and drilling, charging and blasting wells are gradually in the upward direction, leaving a temporary pillar height h, then the Buryat temporary pillar descending fan kits wells, charge and blow it up, and after each cycle of drilling, loading and blasting produce a partial release of broken ore, then create an overlap in the hanging side of the ore body by filling the resulting space hardening filling material through the niche, and after its hardening produce mining stocks unit under protection obtained overlap, while the height h of the interim pillar is equal to the minimum radius Rminbending of the drill rod.

The application of the proposed method in comparison with the prototype allows to improve the performance of the method in the period of sewage extraction with simultaneous decrease in the dilution of the ore rocks hanging steep flanks of the ore body.

How steep development of ore bodies is illustrated by drawings. Figure 1 shows a vertical section along the line b-B, figure 2 shows a horizontal section along the line A-a in figure 3 shows a section along the line C-C (the initial stage of C is of space to fill hardening filling material with marking schemes drilling), 4 shows an intermediate step of creating a space for filling a hardening filling material with marking schemes drilling, figure 5 shows a stage of temporary abandonment of the pillar height h of creating a space for filling a hardening filling material with marking schemes drilling, figure 6 shows a vertical section - filling stage created space for filling a hardening filling material tab, figure 7 shows the stage of sewage extraction, where:

1 - steep ore body;

2 - niche burned in the center of the block on the thickness of the ore body 1 across its stretch;

3 - symmetrically located downstream sets of wells with horizontal holes drilled from niche 2;

4 - descending fans wells drilled from niche 2, intended for blasting temporary pillar height h=Rmin;

5 - trench extended from the trench drift;

6 is an inclined exit;

7 loading races;

8 - haul drift;

9 - vent drift;

10 - linkage of the inclined junction 6 with the drill drift 11;

11 - drill drift;

12 - overlap of hardening backfill material created in the hanging side of the ore body 1;

13 - blastholes for blasting inventory block;

14 - temporary pillar height h;

h - the height of the temporary pillar, left aemula under niche 2, m;

LNL- block length, m;

m - power orebody 1;

W - the line of least resistance;

α - the angle of incidence of the ore body, expected.

How steep development of ore bodies is as follows. Steep ore body 1 prepare the necessary preparatory and rifled workings. Pass delivery passage 8, the loading races 7, of which are trench drift (in the drawing conventionally not shown), extensible into the trench 5. A delivery passage 8 are inclined at exit 6, knocks vent passage 9 of the overlying horizon. Of the inclined exit 6 are linkage 10 with the drill drift 11. Ventilation passage 9 through the center of the block power m ore body 1 across its stretch (up to the hanging side of the ore body 1), which is limited to LNLis the block length and height of the block, 2 niches. From niche 2 Buryat symmetrically located downstream sets of 3 wells with horizontal trunks. Well 3 with horizontal holes are drilling parallel to the plane of the occurrence of the ore body in accordance with its angle of incidence α in the immediate vicinity of the hanging side of the ore body 1. The use of 3 wells with horizontal stems improves the accuracy of breakage and reduce the dilution due to the uniform crushing ore. Due to the symmetric R is polozenie wells 3 with a horizontal one vertical trunks a trunk is used for drilling a series of horizontal shafts, that in turn allows to reduce the volume of drilling. After a phased drilling of 3 wells with horizontal shafts parallel to the plane of the occurrence of the ore body 1 along strike in accordance with the passport blasting, built by one of the known techniques, exercise their loading explosive (pellet or cartridge) and blasting the downstream rows of 3 wells with horizontal trunks. The distance between the horizontal trunks wells 3 vertically is equal to W line of least resistance to achieve maximum efficiency and uniformity crushing ore. A charge of 3 wells with horizontal stems produce up to the point of insertion of the horizontal wellbore (when leaving a temporary pillar 14 charging lead to the path of the temporary pillar). After each stage blasting ore magazineabout partial release of broken ore through the trench 5. Release (partial and mass) are as follows. For example, load-haul-machine (in the drawing conventionally not shown) enters the trench 5 through loading in 7, scoops up repulsed ore and transporting it at the delivery passage 8 to the nearest ore passes (in the drawing conventionally not shown). The breaking and release in the above sequence lead upwards to a temporary pillar 14. In the b pillar 14 required to maintain niches 2 during drilling down-hole fans 4. After a partial release of broken ore under temporary ore entire height h to produce drilling downward fans wells 4. The height h of the interim pillar is equal to Rminwhere Rmin- the minimum bend radius of the drill rod to allow drilling underneath of 3 wells with horizontal trunks. For example, drilling machine company Vermeer type Navigator D7×11A Series II when the rod diameter of 40 mm and the length of the rod 1.8m has a bend radius rod 29,11 m Respectively when using this machine Rminshould be not less than 29,11 m

After blasting and delivery of broken ore in the above-described sequence with intermediate magazynowania produce mass production of ore, leaving filled with ore trench 5, and the resulting space filled hardening filling material to create overlay 12 of hardening backfill material in the hanging side of the ore body. The thickness of the overlap is determined based on the resistance of the host rocks and the resulting migration of the camera. After hardening backfill material begin the clean-out recess. The solidification time mainly depends on the composition of the hardening filling material and can be accelerated by introducing a hardening accelerators. In the center of the block or from one of its edges are cut at the speaker, extensible in cutting the slot (on the drawing conventionally not shown). Then amerivault in accordance with the passport blasting blasting hole 13 for the conditions of the stock block, explode them, air unit and produce ore from the block through the trench 5 under the protection of the created overlay 12.

The application of the proposed method of designing cool ore bodies provides the following benefits:

- reduction of dilution when developing chamber reserves;

- improving the performance of the unit during the period of sewage extraction;

- reducing the overall complexity of the testing chamber stocks.

The method of designing cool ore bodies, including the sinking of the preparatory and development workings, drilling reserves the floor to the bottom of the pillar, loading and blasting holes, magazynowania ore, the issue of broken ore from the block through production release, characterized in that after working driving issue in the center of the block creates a niche for the thickness of the ore body transverse to the stretch, Buryats from her descending sets of wells symmetrically arranged with horizontal holes in the hanging side of the ore body parallel to the plane of the occurrence of the ore body, and drilling, charging and blasting wells are gradually in the upward direction, leaving a temporary pillar height h, after what Buryats on time is the pillar descending fan kits wells, charge and blow it up, and after each cycle of drilling, loading and blasting produce a partial release of broken ore, then create an overlap in the hanging side of the ore body by filling the resulting space hardening filling material through the niche, and after its hardening produce mining stocks block under the protection of the obtained overlap, while the height h of the interim pillar is equal to the minimum radius Rminbending of the drill rod.



 

Same patents:

FIELD: mining.

SUBSTANCE: method includes development of blind ore deposit under guarded object located on earth surface. Before commencement of works there are defined parameters of developed area which facilitates a uniform stress field. Ore body is divided into stories; preparing-cutting, drilling and under-cutting mine workings are performed on the stories; then there is performed excavation of stores of an upper story within the boundaries of the defined contour by system with open developed area. A preventing cushion is left in funnels of outlet. Stores of a lower story are worked out with chambers where temporary stoops are left. Stores of the chamber are destroyed onto compensation slot worked out in the central part of the chamber. The chamber is undercut with a high trench undercutting the tilt angles of borders of which are equal to not less, than natural ore slope value. Ore massif is drilled around with rows of boreholes arranged in a fan shape. By explosion of not charged upper parts of boreholes the upper part of the chamber is arc shaped.

EFFECT: facilitating more complete ore excavation at development and facilitating safety of mining operations.

2 dwg

FIELD: mining.

SUBSTANCE: invention refers to underground development of ore edge seams, particularly of thick and medium deposits. The method includes underground development of deposits 8 with excavation of ore in stope blocks and complete dressing of excavated ores at a concentration plant located underground, transportation and lifting of ore to a receiving hopper of the plant. Rejects of underground dressing are placed in open areas as fill, while produced concentrate is surfaced. To provide construction and operational conditions of underground concentration plant there is performed driving of mine shafts 1 for ventilation, lifting (lowering) of service personnel, of dressing equipment, materials, rejects, concentrates, transport, ventilation and auxiliary mine excavations for relocation of mineral raw material along the process stages of concentrating, for fresh air supply to work places and for withdrawal of polluted air. Process chambers 2, 3 are erected wherein dressing equipment is installed; also there are constructed storage chambers 9 for intermediate storage of current rejects. Location of the underground concentration plant is chosen from the side of the bottom layer of the deposit beyond influence area of seismic loads caused by blasting at ore excavation, along the directions of strike of deposit, transversely the strike and on specified depth after detailed geo-mechanic prospecting and considering minimum of costs. Depending on the output, rejects of concentration are placed in open areas in form of fills, the rest part is lifted to the surface. In order to significantly reduce volumes of the storage chambers, treatment of stope blocks is performed in layers with stowing of each processed layer with concentration rejects. The rational sphere of this invention implementation is underground development of ore deposits, particularly in mountainous areas, in densely populated areas, in regions with adverse climate, and also for deposits occurring at a considerable depth.

EFFECT: upgraded efficiency of underground development of edge seam thick and medium ore deposits and safe operation of underground concentration plant within long period.

1 dwg

FIELD: mining.

SUBSTANCE: invention is referred to mining in particular, to underground mining of steep mineral deposits. The method includes penetrating of development workings and temporary workings, working off in limits of mine section of a mineral stocks from primordial chambers and chamberlets using drilling-and-blasting technique, infilling of the fulfilled room of primordial chambers and chamberlets with lagging. Breakage of stocks of 4 primordial and 3 secondary chambers is performed using general series of hole fans. Breakage of stocks of 4 primordial chambers is performed using a method of holes undercharge with water soluble gel tamping. Then partial discharge of ore from 4 primordial chambers in the conduit is performed followed by lagging of 4 primordial chambers with a hardening mixture. After reaching standard hardness by lagging, washover of the remained holes and/or their parts with water is performed followed by discharge of the remained ore from the conduit of discharge 5, and chambers 3 of the second sequential queue are worked off. Width b of primary 4 chambers is defined from the formula: b = hva2×ρd ×sinα/1800×σt, where hbl - vertical altitude of the block, m; ρd - density of the filling material of primordial chamber, kg/m3; σt - tension strength of the filling material of the primordial chamber, MPa; a - degree of dip of an ore body, grades.

EFFECT: increased range of application on steep and high-dipping fields, in ores of mean and small stability, higher performance of working off of the operational block during clearing excavation of chambers of the second sequential queue.

6 dwg

FIELD: mining.

SUBSTANCE: invention concerns mining and can be used in mining ore bodies under protection of flexible covering. The method involves creating niches in the ore body, making down holes at the level of ore occurrence up to the lowest mark of a block, placing guideways and lag ropes, fastening them in the upper part. The method further involves boring a fan in the top wall of the ore body, in a parallel plane to occurrence of an ore body. On one charged fan of holes located in the centre against other fans, two single fans After loading the holes with explosive and detonations release of muck pile is performed. Further on, winches are mounted in the top niches, attaching lag cables, then the directing cables in the conduit are pull and used together with lag cables for stretching flexible cover in an upward direction. After stretching the covering is fixed in the top part of the block performing workout of stocks of the block.

EFFECT: increased productivity of the block during second mining, decreased labour iousness of flexible covering installation and decreased impoverishment while mining chamber stocks.

5 dwg

FIELD: mining industry.

SUBSTANCE: present invention relates to the field mining using thermal fragmentation for the extraction of ore from narrow veins. The method of ore extraction from a vein with opposite side walls involves drilling of pilot holes in the vein directly, with certain pitch along the vein, reaming of the pilot holes by thermal fragmentation until the vein is fragmented, and removal of fragmented ore along the vein. The pitch is determined by the vein width. Along a part of the vein, the pilot holes are reamed gradually according to the given configuration, each second pilot hole is reamed in a greater degree, for its connection to the opposite adjacent pilot holes reamed earlier. The pilot holes are drilled and reamed in a given sequence, starting from drilling of the first group of three pilot holes, the first and third holes from the first group are reamed before reaming the second hole from this group. After the first group of holes, a group of two holes is drilled, the second hole from the second group being reamed before reaming the first hole from the second group. Fragmented ore is removed by suction.

EFFECT: profitable mining of narrow ore veins.

7 cl, 6 dwg

FIELD: mining.

SUBSTANCE: method includes the subterranean development of field with use of the chamber systems with the solid stowing and following refinement of the ore mass at the ore mill in the following stages. At the beginning, the ore recovering from the first-stage chamber (4) is performed. The ore pickings from the first-stage chamber (4) are processed to concentrate and final tailings. The tailings are processed to pellets. From the pellets, two workflows are formed, the first pellet flow is exposed to the heap leaching, and the second pellet flow is conditioned until the required mechanical characteristics. On completion of the leaching process, the pellets of the first workflow are mixed with binding agent and water, to receive the fill mixture, the fill mixture is sent to the first-stage chambers (4) until filling; after the fill mixture is solidified, the ore recovering from the second-stage chamber (5) is performed, the chamber's bottom is strengthened and prepared with the solidifying mixture which is prepared using the waste from the heap leaching; pellets of the second workflow are sent to the chamber with their following subterranean leaching.

EFFECT: comprehensive and complex development of minerals and ecologic-economic effects are provided.

4 cl, 1 dwg

FIELD: mining engineering.

SUBSTANCE: working method includes drifting of preparatory breakoffs, slicing of stope inclined strips, inclined according to sloping angle of ore body, beginning with hanging layer directed to bottom wall, ore breaking with explosive holes. Breakage, transportation and formation releasing from rocky bands in ore body are carried out separately through the flanking debris chute. Previous slice after corresponding preparation is filled with weak solid stowing, which provides hardiness of its walls, at that interblock pillars are eliminated with leaving of free technological space between ore mining face roof and horizontal surface of previous slice filling mass. At first one excavates low layer of the block with entry ways at whole its length, fills worked entry ways with hard solidifying mixture in particular order with preliminary armature setting up, so that after the complete excavation of the layer in-situ concrete slab is appeared. It performs the functions of ceiling while debugging of underlying block reservoir.

EFFECT: effectiveness improvement of ore excavation and safety of stopes working.

4 dwg

FIELD: mining industry.

SUBSTANCE: said method implies development and temporary drifting, horizon reserves hole drilling down to pillar bottom, hole 13 charging and blasting, loading of dumped ore from the block through loading workings 5. After loading workings drifting, stables 2 are worked out in the block corners, cutting across thickness of the ore body, fanned ring is drilled in the ore body hanger in parallel to the ore body bed. Per single charged fan, which is central as regards to other fans, four empty fans are drilled, after charging and blowing dumped ore is loaded, and then canopy 12 is created in the ore body hanger by stowing the resulting space with consolidating stowing material. After consolidation, block reserves are processed under canopy 12 protection, thickness h of the canopy being determined according to formula: h = L2ρ"P"/2000σ"R")sinα, where L - block slip, m; ρ"P" - canopy material density, kg/m3; σ"R"- canopy material tensile strength, MPa; α - ore body slope angle, degrees.

EFFECT: said invention provides for less labour intensity and improved output of stoping.

5 dwg

FIELD: mining, particularly underground thick ore body mining with chamber excavation system with goaf filling at large depths in the case of elevated rock pressure.

SUBSTANCE: method involves cutting unloading slot (slot raise) along ore body strike and before chamber stock excavation initiation in massifs of chambers of the first, the second and the third stages; filling the unloading slot with shrinkage ore; connecting unloading slot ends with cleavage cracks in different stages, wherein the cleavage cracks are formed by drilling wells of 100-112 mm diameters spaced apart 1-1,2 m apart along stage boundaries between sublevels so that each second well is blasted. As lying wall and hanging wall converge ore massifs of the first, the second and the third stages are shifted and slide one relatively another along with partial pillar breakage in unloading slots. To block filling material penetration through slot raise excavations passing through pillars, concrete bridges are erected in the slots. After than chambers of the first stage are cut and filled. After drilled cross-drift cutting the second and the third stage massifs are broken on previously driven slot raises.

EFFECT: increased mining safety and filler, improved stability of the first, the second and the third stage ore massifs, as well as contact massifs of lying and hanging walls.

1 dwg

FIELD: mining, particularly underground deposit mining.

SUBSTANCE: method involves separating mining level into chambers arranged in staggered order, wherein chambers of each lower level are shifted with respect to ones of upper level for half of chamber width; preparing each mining level and sublevel by lateral drift excavation; forming inclines and cross-drifts to hanging wall of deposit; developing rises from cross-drifts of mining level, which are converted into slot raises; cutting chamber stock to open face. Mining levels are separated into chambers without safety pillar leaving. The chambers are shaped as hexahedrons. Ceilings are fully removed from mining level cross-drifts and are filled with filler. To cut chamber stocks ore level and sublevel drifts are created at lying walls. Inclines are cut from ore sublevel drift so that inclines extend between chambers. Fan-like wells are drilled from ore drifts and mining level stocks are blasted. Ore is drawn from each chamber to slot raise through incline ends in mining level and sublevel.

EFFECT: increased ore deposit thickness, decreased stock preparation and cutting time, as well as reduced mining costs.

2 dwg

FIELD: mining industry.

SUBSTANCE: method includes conditional separation of levels on chambers, which are made in form of stretched upwards hexahedron and placed in staggered order, at each lower level with displacement for half of chamber width in comparison to upper one. Preparation of each lower level is performed by driving field drift of main level, from which entries to ore deposit and orts to hanging side of deposit are driven, from orts ascending drifts are made and cut with cutting slits. For extraction of field resources a field sub-level drift is driven, entries and ore sub-level drift near lying side, from where orts are driven, from drift well fans are drilled and main resources of level are exploded through cutting slit. Outlet of ore from each chamber is performed through ends of outlet mines in main and intermediate levels. After removing main resources inter-level block is destroyed and ore from it is removed through entries of main level.

EFFECT: higher efficiency.

2 dwg

FIELD: mining industry.

SUBSTANCE: method includes preparation and well extraction of resources of chambers with partial backfill of extraction space. Blocks of upper level relatively to blocks of lower level are placed in staggered order, while blocks are made in form of a stretched upwards hexahedron. Resources of block within one hexahedron are separated on two chambers, one of which, placed along periphery of hexahedron, after extraction and removal of ore from it is filled by hardening backfill. Second order chamber is made of hexahedron-like shape, extracted and removed under protection from artificial block on all six sides of this chamber. Removal of ore from first order chambers is performed through one removal mine - end of level ort and cross-cut in lower portion of block and intermediate sub-level cross-cuts.

EFFECT: higher efficiency.

2 dwg

FIELD: mining industry.

SUBSTANCE: method includes driving ventilation-backfill and drilling-loading gains, extraction of mineral resource by cross-directed chambers of rhombic or ellipsoidal shape, with displacement of adjacent levels chambers for half their width, with extraction of ore by wells explosion and backfill of extracted space. Directly above upper level protective ceiling is constructed with slant 5-6° towards hanging side of deposit. Width, height of chambers an height of upper level chambers, slanting angle of side walls of chambers is determined from mathematical expressions, on basis of stable calculated span of protective ceiling, width of drilling-loading gain and angle of inner friction of ore massif. After construction of protective ceiling ore in chamber is extracted by mines by exploding wells in compressed environment, while next mine is extracted after backfill of previous one. In unstable rocks, prone to cave-in, face of cleaning chambers is slanted at angle, appropriate to angle of natural slant of ore massif. In ores with rock layers cleaning chambers face is slanted at angle, appropriate for angle of falling of ore deposit.

EFFECT: higher safety, higher efficiency.

3 cl, 4 dwg

FIELD: mining industry.

SUBSTANCE: preparation of resources of ore body is performed by driving in main level and on other levels of field backup drifts, from which drifts are driven and along lying side ore trench drifts are driven. Resources of levels are separated on sections, in each of which ascending lines are driven, from which sub-level ore drifts are driven and then ascending lines are cut on cut slits. Extraction of block deposits is realized via deep wells from trench drift and sub-level ore drifts. Outlet of ore mass is performed through ends of drifts into field drifts of levels and main level.

EFFECT: lower dilution and ore losses.

2 dwg

FIELD: mining industry.

SUBSTANCE: method includes preparation of bottoms of blocks by driving drifts at main level from field backup drift, from which along lying side ore trench drift is driven, following extraction of block resources is performed from trench drift and sub-level mines. Outlet of ore mass is performed through drifts ends.

EFFECT: lower dilution and ore losses.

2 dwg

FIELD: mining industry.

SUBSTANCE: method includes extraction of deposits by panels, wherein drilling ascending lines are driven, drilling of wells fans from ascending lines and following extraction of mineral resource. Extraction of resources is performed in upward direction, while ascending lines are driven with deepening in rocks of lying block, concurrently on its soil metallic sheets are placed, on which firstly rocks are extracted, which are ten sent to previously extracted chambers. Extracted ore mass is let out of chamber and loaded at main level.

EFFECT: higher intensiveness of extraction, higher ore yield, decreased dilution.

3 dwg

FIELD: mining industry, particularly for underground ore deposit mining.

SUBSTANCE: method involves mining the deposit by rooms in which raise drills are bored; drilling wells arranged in fan-like array and cutting mineral. Raise drill is deepened in lower wall rock and bottom thereof is covered with metal sheets. Ore is cut in parts simultaneously with rock excavation in the range from raise drill ground to room ground at original ore mass slope angle.

EFFECT: increased cutting intensity, reduced ore losses in lower wall rock at room fender due to impoverishment thereof.

3 dwg

FIELD: mining, particularly ore deposit development.

SUBSTANCE: method involves drilling sublevel drifts or crossdrifts, haulage roadways and drives along with cut rock unloading through drive ends, wherein drives extend for the full height and over full cross-section from haulage roadways; closing upper parts of drive ends with shields or crossbars before rock unloading so that shields or crossbars reach end part of unloading entries; discharging cut ore through lower parts of drive ends; increasing drive end widths and reducing lengths thereof for value determined from mathematical expressions taking into consideration height of main and end parts of unloading entry, depth of loading device bucket and natural inclination angles of ore mass to be discharged and generating line of ore bed.

EFFECT: increased efficiency of ore field development.

3 dwg

FIELD: mining, particularly underground mining.

SUBSTANCE: device comprises support member pivotally connected to enclosing member. The enclosing member is secured to posts by jack and is installed at an angle enough for ore mass sliding down. Lower part of enclosing member is located at height enough for loader bucket operation. Enclosing member length defined between mine roof and above enclosing member location height is determined from mathematical expression. Enclosing member width is equal to mine width.

EFFECT: increased effective cross-section of ore mass to be drawn and, as a result, increased ore piece dimensions, reduced mine driving volume, decreased losses and ore dilution, increased output.

2 dwg

FIELD: mining, particularly underground ore deposit development.

SUBSTANCE: method involves dividing ore deposit into mining levels, cutting the mining levels in descending order and filling excavated space with hardening filling material, wherein filling material is supplied from day surface via main filling holes drilled in ledge wall rock outside shifting zone, which is formed in ledge wall rock during full ore deposit development. The first layer is cut from one mining level boundary along ore deposit strike in direction to another mining level boundary. Additional filling holes are drilled in zone defined by two lines before the first mining level cutting. The first line is extension of resulting excavated space boundary from ledge wall side. The second line is extension of the first mining level boundary along ore deposit strike, from which mining level is cut. Main filling holes are drilled before putting additional filling hole out of operation. If additional filling holes are arranged within the shifting zone forming in ledge wall rock during full ore deposit cutting additional holes are operated up to cleaning work development stage. At cleaning work development stage additional well deformation is equal to threshold deformation values. Safe additional hole operation is impossible if deformations exceed above threshold values. In particular case additional filling holes are made along bisector of angle defined by two lines, namely by the first line, which is extension of resulting excavated space boundary from ledge wall side, and by the second line, which is extension of the first mining level boundary along ore deposit strike, from which mining level is cut.

EFFECT: reduced mine construction time.

2 cl, 2 dwg, 1 ex

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