Method of development of blind ore bodies under guarded objects

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

 

The invention relates to the mining industry, in particular to the development of steeply-dipping blind ore bodies, and can be used in underground mining of mineral deposits.

A known method of processing separate ore deposits (Vremenem. The process of underground mining operations in the development of ore deposits. - M.: Nedra, 1978. S-370) camera developed open space without leaving pillars, and for ore bodies, elongated along the strike, leaving mercanery pillars, with separate floors or poletai.

This method of testing is possible when developing a small separate blind ore bodies, because it does not include the value of the camera settings and overlapping strata and does not determine the nature of the processing results.

Closest to the proposed technical solution is the method of processing the blind ore bodies (Navlog. Management of mountain pressure in underground mines. M.: Nedra. 1988. - P.194-195), involving separation of the ore body on the floor, and the array of each floor on blocks, the comprehensive preparatory-cutting, drilling and slash workings on the floor, drilling ore array block deep wells, the blasting of the ore massive charges of deep wells, monitoring of overlapping strata.

This method does not provide the AET mine safety under the protected objects.

Unified technical result is an increase in the completeness of extraction of ore when mining and safety of mining operations.

Unified technical result is achieved in that in the method of processing the blind ore bodies under the protected objects, including the separation of the ore body on the floor, and the array of each floor on blocks, the comprehensive preparatory-cutting, drilling and slash workings on the floor, drilling ore array block deep wells, the blasting of the ore massive charges of deep wells, monitoring of overlapping strata, according to the invention, before carrying out complex training and development workings setting the initial stress field created out space on the floor and determine the ratio of the parameters generated goaf where around the edge of the goaf provides uniform the stress field testing of the upper floors provide open mined-out space, with sufficient height to be mined floors with open mined-out space is determined from the relationship:

N<l,

where N is an adequate amount of working height floors with open goaf, m;

l - equivalent migration of verboten the space along the strike of the ore body, m,

and subsequent floors work chamber, leaving temporary pillars, while the drilling array within the camera to produce a series of counter-right-located wells in full working height of the camera, to improve the stability of the upper part of the chamber give arched form by blasting nedoskazannykh at the top of the wells and the bottom of the camera give pitched relative to the longitudinal axis of the chamber shape with angles of inclination to the horizon, not smaller angles of repose smitten rock mass, and the breaking of rock mass in the chamber is carried out while blasting charges wells on the compensation gap, located in the Central part of the contour of the camera, eliminating harmful seismic impact on the stability of the walls and roof of the chamber.

The establishment of the initial stress field created out space on the floor and the definition of the parameters, which ensure a uniform stress field, allows for the testing to maintain a steady state open out space on the upper floors and thus improve safety. Calculations of sustainable goaf exclude formation on the earth's surface when working under water objects, water conducting fractures. At sustainable settings produced the CSOs space deformation of the earth surface in the area of water bodies does not occur and prevents the penetration of water into the mine workings.

Steady state outcrop of the ore body and the earth's surface makes it possible to work out the stock upper floors system developed by the open space.

Working out in the stable regime of the upper floors with an open mined-out space at a sufficient height (depth testing) can reduce ore loss and to reduce the costs of additional measures to maintain goaf.

Development of the lower floors of the chamber, leaving mercanery pillars reduces the costs of additional measures to maintain goaf (e.g., bookmark). Making an arched shape to the upper part of the chamber when developing the lower floors allows you to secure the camera for more stability. The curvature of the upper part of the chamber can be changed within wide limits depending on the desired stability after testing. This is achieved by adjusting the height of the charge in the wells. Giving the bottom of the camera gable form provides gravity ore from the camera without slowing down, increasing the completeness of extraction of ore.

The breaking of ore in the chamber on the compensation gap, located in the Central part of the camera, allows you to increase security by maintaining sustainable contour camera for blasting.

The essence of order the solutions illustrated by the drawings, which figure 1 shows a longitudinal section of blind ore deposits under the protected object on the earth's surface, figure 2 is a longitudinal section of blind ore deposits under the protected object on the earth's surface on the lower floor, are working chamber system.

The proposed method of testing is as follows.

For blind ore deposits 1 under the protected objects 2, located on the earth's surface 3, determine the parameters of the developed space 4, which provides a uniform stress field. The parameters of the developed space 4 is chosen on the basis of measurements and calculation of the initial stress field with regard to its height does not exceed the equivalent span. Then ore Deposit 1 smash on the floor.

In accordance with this condition within the loop created goaf receive training and rifled 5, drill 6, slash-and-burn production on the top floor and perform within a specific contour of the ore reserves system developed open space 8 without leaving pillars. To improve the safety of mining operations to the level of craters issue 9 on the top floor and leave the safety cushion 10.

Work on the underlying floor start with a breakdown of array floor to the blocks in which the Commission is s development camera 11 with the temporary abandonment of pillars 12. In blocks receive training and rifled 5, drill 6, slash-and-burn 7 output.

In the Central part of the chamber 11 to form the compensation gap 13, which will obresult subsequently, the stock camera. In the lower part of the chamber to form a high trench cutting 14, the angle of inclination of the sides 15 of the trench 14 perform at least angles of repose thump of hands of the rock mass (55-60 degrees). Array ore in the chamber 11 abureau of drilling openings 7 rows of fan-located wells 16 and obresult.

During collapse of the array camera 11 drill holes 16 in the upper part nodosaria, so that when the rotating drum to receive the arched shape of the upper part 17 of the chamber 11. Results isolation of the array after each explosion wells 16 and the curvature of the formed upper part 17 of the chamber 11 is determined by the length of the remaining ends of the wells 16. According to the measurements on each set of wells 16 are sections that give a clear picture of the shape of the upper part 17 of the chamber 11. Thus conduct full testing of the floor alternating camera - rear camera.

This technology has been applied in the development of the plot "Underflow" JSC "Chargesthe RU" under protected water body is a stream of Big river.

Work floor +185 to+255 m are the mining system developed by the open space.

For security purposes, there are additional constructive the minimum level of protection in the part of the water body:

- penetration openings with mandatory advanced drilling wells;

- decrease simultaneously exploding charges in the unit to eliminate harmful effects on seismic stability of walls and roof of a goaf;

- leaving the safety cushion at the level of the craters of the issue;

- installation of water-proof jumper with doors;

- clearing dewatering grooves on working on the horizon.

When mining stocks ore deposits in the floor +115 to+185 m provided by the draft chamber system testing, leaving temporary pillars. For the development of the reserves of the floor taken with the following parameters: width of camera 12-13 m, the width of the chamber 20 m, the height of the camera 55-60 m, which corresponds to the design parameters with the goal of preserving the area of sustainable outcrops camera.

The use of the proposed technology in the development of blind ore deposits section of the Riverbed under a protected object - Creek Big river will allow you to extract the ore reserves with a minimum of ore losses and minimal dilution while ensuring the safety of mining operations.

The method of processing the blind ore bodies under protected water objects, including the separation of the ore body on the floor, and the array of each floor on blocks, the comprehensive preparatory-cutting, drilling and slash in the wages on the floor, the drilling of the ore array block deep wells, the blasting of the ore massive charges of deep wells, monitoring of overlapping strata, characterized in that before carrying out complex training and development workings setting the initial stress field and determine the ratio of the parameters generated out space on the floor where around the edge of the goaf is ensured by a uniform stress field, the development of the upper floors provide open mined-out space, with sufficient height to be mined floors with open goaf is determined by the relation

N≤1E,

where N is an adequate amount of working height floors with open goaf, m;

1E - equivalent migration out space along the strike of the ore body, m,

and subsequent floors work chamber, leaving temporary pillars, while the drilling array within the camera to produce a series of counter fan located wells at full working height of the camera, to improve the stability of the upper part of the chamber give arched form by blasting nedoskazannykh at the top of the wells and the bottom of the camera attach gable otnositel the longitudinal axis of the chamber shape with angles of inclination to the horizon, not smaller angles of repose smitten rock mass, and the breaking of rock mass in the chamber is carried out while blasting charges wells on the compensation gap, located in the Central part of the contour of the camera, eliminating harmful seismic impact on the stability of the walls and roof of the chamber.



 

Same patents:

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, particularly methods of underground mining.

SUBSTANCE: method for ore body having low and medium thickness development by mine sections involves preparing, cutting and drilling wells from drilling rooms; charging wells with explosive and blasting thereof; drawing ore from blocks and supporting goof. As mine section stock is excavated breakage heading line is advanced in several sections along ore body propagation line. Drilling rooms extend along maximal ore body shape variation line. Ore in section is cut in several layers transversal to longitudinal drilling room axis. Said layers have constant dimensions measured in direction of maximal ore body shape variation line. Layer dimensions in direction of maximal ore body shape variation line are divisible by line of least resistance. Layers have variable dimensions in direction of minimal ore body shape variation line and are determined to provide completeness of curvilinear ore body area cutting with linear stopping zone section.

EFFECT: increased labor productivity and mechanization degree due to improved self-moving or monorail drilling rig usage.

5 cl, 22 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

Up!