# The method of extraction of minerals from the selection area career

The invention relates to the mining industry and can be used for the open development of mineral resources. The method of extraction of minerals from the selection area career includes drilling on the top floor of a high ledge, loading and blasting hole charges, wells are drilled to the depth of the high ledge at an angle of inclination equal to the angle of inclination of the slope of the ledge, and the width of the gripping block is determined from the ratio that takes into account quotient of the magnitude of the height of the strike in the square on the double product of the height of the ledge on the degree of fragmentation, multiplied by the difference of kotangens angles of repose of the rock mass and the angle of the ledge. Achieved reduction in road construction during the shipping of the bulk mineral. 4 Il.

The known method development zakonchennih ore reserves tests in the areas of career, which includes excavation of underground mining, mining of mineral cameras followed the mined-out space [1].

The disadvantage of this method is the large amount of the sinking of the underground workings.

There is a method of developing a high ledges, vkluchaya each pedostop in the external and internal piles [2] - the prototype.

The disadvantage of this method are the high cost of building roads on every photostop for shipment and transportation of rock mass.

The present invention allows to obtain a technical result, expressed in the reduction of podustov when shipping the bulk of the rock mass, for example, to one, and therefore, the decrease in the construction of roads required for the shipment and transportation of rock mass.

The technical result is achieved by the fact that in the proposed method of extraction of minerals from the selection area of the quarry, including the formation of a high ledge, for example, built-in Board career, drilling on the top floor of the ledge, the loading of EXPLOSIVES and blasting borehole charges, loading of the rock mass and the transportation of its internal and external piles, drilling for charges loosening produce the full height of the ledge at an angle equal to the angle of the slope of the ledge, and the width oburevaemogo block from the upper edge of the ledge to the border of the block is determined from the relation

where L is the size of exploding block from the upper edge of the ledge to the border of the block, m;

To_{p}- coefficient of fragmentation;

h - the height of Nabal, m;

H - the height of ostol of inclination of the slope of the ledge, hail,

the height of the strike must be equal to or less than the height decreased excavator [3]

hh_{e},

where h_{e}- height decreased excavator, m,

and shipment of bulk rock mass produce one layer from the bottom of the pit, or on the lower platform bench, after cleaning of naval operations repeat.

New features in the proposed method are:

- drilling of wells producing to the full height of the slope;

- inclination wells under charges loosening take is equal to the angle creativesage ledge;

- the size of exploding block from the edge of the ledge to the border of the block is determined by the dependencies;

- shipment of bulk rock mass produce one layer from the bottom of the

career or below the ledge.

The advantage of the proposed method is the possibility to work out of Nabal one layer (the ledge), which excludes construction dopolnitelnyefunktsii communications at postupnoy the depletion of the bulk of the prototype.

The proposed method differs from the prototype above sequence of operations. Outlined in this population features are absent in the known solutions and provide a positive effect. The proposed method has the properties, not supnot the proposed solutions are not disclosed and are not obvious. The proposed method is characterized by a new set of features that allows you to read it meet the criteria of “novelty” and “inventive step”.

In Fig.1 shows a plan section of the pit wall from drilled wells in Fig.2 - section a-a in Fig.1; Fig.3 is a plan of the site after production blast hole charges; Fig.4 is a section along B-B in Fig.3.

The method is as follows. Calculate the necessary width L, Obrucheva blasting operations unit according to the formula

where L is the width of the block, m;

To_{p}- coefficient of fragmentation;

h - the height of Nabal, m;

H - the height of the ledge, m;

- the angle of repose of the rock mass, deg;

- the angle of the slope of the ledge, hail,

maintaining the value

hh_{e},

h_{e}- height decreased excavator, m

At a distance L drilling of wells 1 on the upper platform 2 of the ledge 3.

Wells are drilled to the full height of the ledge N angleequal to the anglethe slope of the slope of the ledge 4. Charge wells of EXPLOSIVES and blow up the borehole charges. Blasted rock mass 5 has been coming down to the bottom of the pit 6. Make shipping less than 8. Operations development block repeat.

A specific example of the method. Order full disclosure of technical nature and advantages of the present invention shows an example where the source data are as follows:

- cliff height of 36 m;

- height decreased excavator equal to the height of Nabal - 15 m;

- the rate of loosening -1,1;

- the angle of repose of the rock mass - 30;

- the angle of the slope of the ledge - 65°.

Based on the calculated width of exploding block, and the height of Nabal should be no more than the height of the stock of excavator.

Taken to 3.6 m For loosening block the blast borehole charges taken uniserial arrangement of wells.

Produced by drilling wells at a distance from the upper edge of the ledge L=3.6 m, loading them with EXPLOSIVES and blasting. The rock mass will be located at the angle of repose 30°, and the height of the strike will be 15 meters Produced a shipment of rock one ledge (layer) height 15 m without building roads on every photostop of the prototype. When practicing the following blocks of the operation repeated.

Thus, the information presented show that the inventive method can be used in the mining industry.

Economic efficiency is sloinoi shipment of bulk.

Implementation of the claimed method is technically possible and economically feasible. Therefore, the claimed invention meets the condition of “industrial applicability”.

Sources of information

1. USSR author's certificate No. 11042741, “Method development zakonchennih ore reserves tests in the areas of career, IPC E 21 41/00, publ. 1984, No. 27.

2. Theory and practice of open development/Ed. by Acad. N. Century Melnikova. - M.: Nedra, 1979, page 222.

3. Reference “Open pit mining”. - M.: Mining Bureau, 1994, page 121.

Claims

The method of extraction of minerals from the selection area of the quarry, including the formation of a high ledge, for example, embedded in the wall of the open pit, drilling on the top floor of the ledge, the loading of EXPLOSIVES and blasting borehole charges, loading of the rock mass and the transportation of its internal and external piles, characterized in that the drilling for charges loosening produce the full height of the ledge at an angle equal to the angle of the slope of the ledge, and the width of the gripping unit from the upper edge of the ledge to the border of the block is determined from the relation

where L is the size of exploding block from the upper edge of the ledge to 945.gif">- the angle of repose of the rock mass, grad.;

- the angle of the slope of the ledge, grad.,

the height of the strike must be equal to or less than the height decreased excavator:

hh_{e},

where h_{e}- height decreased excavator, m,

and shipment of bulk rock mass produce one layer from the bottom of the pit, or on the lower platform bench, after cleaning of naval operations is repeated.

**Same patents:**

FIELD: mining art, in particular, open-pit mining of mineral resources by high benches.

SUBSTANCE: large-diameter single holes are replaced by a pair of divergent holes of a smaller diameter, in which one hole is always vertical, and the other one is inclined towards the bench; the single holes of the larger diameter are replaced with a pair of divergent bundles of parallel converged holes, in which one bundle is vertical, and the other is inclined towards the bench; the single holes of the larger diameter are replaced with a pair of divergent holes of a smaller diameter, in which one hole is vertical, and the other is inclined towards the bench and positioned in the vertical plane parallel with the first one and distant from it by 1-2 hole diameters; the single holes of the larger diameter are replaced by a pair of divergent bundles of parallel converging holes, in which one bundle is vertical, and the other is inclined towards the bench and positioned in the vertical plane parallel with the first one and distant from it by 1-2 hole diameters.

EFFECT: enhanced efficiency of blasting of the benches.

7 cl, 6 dwg