Method of bulldozer development of placer mines

FIELD: mining.

SUBSTANCE: method includes definition of coordinates of receiving hopper location and arrangement, definition of average transportation distance at specified receiving hopper location and on the basis of this information technical and economical parameters of ground development, rock straight movement towards receiving hopper by bulldozer, washing and extraction of mineral resource. Note that average transportation distance is defined as weighted average distance from receiving hopper to all points of the ground of random configuration and area S at zero point located at hopper location point.

EFFECT: improvement of excavation equipment effectiveness and decrease of daylighting and mining activities prime cost at placer mines development.

2 dwg

 

The invention relates to the mining industry, and in particular to methods bulldozer placer developments, and can be used primarily in the extraction of gold in the placers.

The known method bulldozer placer developments, including the coordinates of the location of the hopper and its placement, to determine the average distance of transportation for a given placement of the hopper and on the basis of technical and economic indicators of the development of the polygon, move rocks bulldozer straight to the receiving bin, washing and extraction of minerals, in which the average distance of transportation of Lcfdefined as the distance from the center of gravity of the polygon to the hopper [1]. In particular, for a rectangular polygon with sides a and b at the angular location of the hopper, the value of Lcfis determined by the formula

The disadvantage of this method is that the average distance of transportation is defined as the distance from the center of gravity of the polygon to the hopper. This understanding of the average distance of transportation does not meet the geometric sense, as the weighted average distance from all points of the polygon to the receiving Ditmar bunk is RA.

The closest technical solution to the claimed method is bulldozer placer developments, including the coordinates of the location of the hopper and its placement, to determine the average distance of transportation for a given placement of the hopper and on the basis of technical and economic indicators of the development of the polygon, move rocks bulldozer straight to the receiving bin, washing and extraction of minerals. In this way is considered a rectangular polygon with sides a and b at the angular location of the hopper and the average distance of transportation is defined as follows [2]. The polygon is split by a diagonal into two triangles, and the value of Lcfconsidered as the average distance to the gravity centers of these triangles and is calculated by the formula

The disadvantage of the prototype is a discrepancy between the values L real value of the average distance of transportation, which is defined as the weighted average distance from all points of the polygon to the hopper. Indeed, theoretical mechanics for a system of n material points with masses mi(i=1,...,n) Cartesian coordinates xc, yc, zcthe center of gravity determined by the formula

wherethe mass of the whole system.

For flat uniform shape, which is developed polygon formulas have the form (see figure 1):

where S is the area of the polygon.

Therefore, to find the coordinates of xcand ycthe center of gravity of the flat figures, it is necessary to determine the static moments of the shape relative to the two coordinate axes, i.e., the product xdS and ydS areas of elementary sites dS on their distances to the respective axes (see figure 1).

Thus, the center of gravity in theoretical mechanics is determined by projecting points on a certain axis, every point is considered the distance to this axis, and not to a specified point (the bunker). The interpretation of Lcfas the distance from the center of gravity of the polygon to the hopper ineligible due to the fact that the trajectory of the bulldozers (live) converge to the receiving bin and in no way are parallel lines. And for non-parallel lines known formula for determining the center of gravity is unsuitable.

The objective of the invention is to increase the technical and economic indicators bulldozer placer developments at the expense of correct and accurate measure of the average distance of transportation at any geometrician who achieved the shape of the polygon.

Achievable technical result is to increase the efficiency of the use of bulldozers in optimal sizes of the polygons of arbitrary shape.

This technical result is achieved by the fact that in the known method bulldozer placer developments, including the coordinates of the location of the hopper and its placement, to determine the average distance of transportation for a given placement of the hopper and on the basis of technical and economic indicators of the development of the polygon, move rocks bulldozer straight to the receiving bin, washing and extraction of minerals, the average transportation distances for arbitrary polygon configuration and area S when placing the origin at the point of location of the bin is determined by the formula

where Lcf- the average distance of transportation;

the x-and y - coordinates of the location of the hopper.

Double integral (3) is the definition of average distance Lcftransportation as the weighted average distance from all points of the polygon to the hopper and allows to obtain the exact value of Lcfif you know the equation of the curve bounding box. If the polygon is limited from the top to the willow y=y 2(x)and the lower curve y=y1(x) (see figure 2), the integral (3) can be written in the form

Specified in the independent claim of the set of features includes all features, each of which are necessary and together sufficient to obtain a technical result.

The average distance Lcftransportation has a significant impact in the choice of technology and technological schemes of mining and washing and is one of the determining factors in the formation of the cost of mining operations. When a known volume V of roaming the Sands and the volume V1Sands moved for one check-in, total number of races will be N=V/V1. Then the total distance transportation of sand is equal to L=Lcf(V/V1). The total length L and, accordingly, the value of Lcfdetermine the main technical and economic indicators bulldozer design polygon, in particular a number of bulldozers in accordance with the performance of the washing device, the location of the hopper corresponding to the minimum of Lcfand ultimately, the cost of transportation of sand. Thus, the value of Lcfsignificantly affects the effective use of earth moving equipment (bulldozers) and ultimately on the cost price is Stripping and mining, therefore, the correct definition of this concept should be given close attention.

The method is carried out by sequentially perform the following operations.

Based on the geometric shape and location of the polygon with a given area determine the coordinates of the location of the hopper and produce its placement. Impose a coordinate system with the origin at the location of the hopper and formula (3) determine the average distance of transportation. This polygon can be approximated by a simple geometric shape (rectangle, triangle, trapezoid, and others), for which the calculation by the formula (3) is fairly simple. If necessary, a more precise definition of Lcffind curves that define the boundaries of the polygon, and find the value of Lcfby the formula (4).

Sources of information

1. Galkin G.S. Determine the optimum dimensions of the instrument field // proceedings of the VNII - 1, volume XVI, Magadan, 1960.

2. Berezin VP determination of the optimal parameters of the mining sites and the construction of an algorithm of calculations on a computer // Kolyma, 1967, No. 3.

The way dozer placer developments, including the coordinates of the location of the hopper and its placement, to determine the average distance of transportation when specified the placement of the hopper and on the basis of technical and economic indicators of the development of the polygon, moving rocks bulldozer straight to the receiving bin, washing and extraction of minerals, characterized in that the average distance of transportation determined as the weighted average distance from the hopper to all points of the polygon of arbitrary configuration and area S when placing the origin at the point of location of the bunker, the average distance of transportation for polygon determined by the formula:
,
where Lcp- the average distance of transportation;
x-and y - coordinates of the location of the hopper.



 

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