RU1786259C - Method for mining of boundary ore resources in opencast flank zones - Google Patents

Abstract

The invention can be used in the development of contour reserves of the quarry. The goal is to reduce the cost of providing transport links between the horizons of the quarry while maintaining it during mining of the ledge. Underground pit mines run from the quarry site. The extraction of mineral reserves is carried out using open chambers with the formation of a filling array. Testing of the chambers is carried out in parts. Each part of the chamber is laid with a hardening mixture after it has been worked out. The development of the subsequent part begins after the strength of the filling mass in the previous part (layer) is set. Moving the vehicle along the ledge is carried out in the process of testing the chamber. 7 ill.

Description

The invention relates to open pit mining technology and can be used in the development of open pit mining reserves.

There is a method of developing near-ore ore reserves in dash areas of a quarry, including carrying out a ledge of a transport adit from a working platform, excavating ore with chambers with drill-and-blasting blasting, releasing it into an adit, and laying the mined-out chamber space with a hardening mixture with the formation of a filling array.

The disadvantage of this method is significant loss of ore in the rear pillar.

Closest to the proposed method is the development of near-ore ore reserves in the dash areas of the open pit, including carrying out a transport adit from the open pit working site, excavating ore with open chambers from the ore body boundaries to the open pit area with drill-and-blast blasting, releasing it into the adit and filling up the worked out chamber space with a hardening mixture with the formation of the filling array. The method ensures the safety of the limiting contour of the pit and the reduction of ore losses in the outer marginal zone of the pit.

However, the known method has the following disadvantage. The practice of refining deposits by the open-underground method confirms that its efficiency is improved while conducting open-cast mining and underground refining of equipment reserves through open pit transportation systems. Therefore, the possibility of preserving transport platforms on ore ledges while simultaneously developing near-surface reserves will eliminate the existing drawback of the known development method.

The purpose of the invention is to reduce the cost of providing transport links between

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the quarry’s umbrellas while maintaining it during mining of the ledge.

This goal is achieved by the fact that in the known method of mining near-ore reserves in ore zones of the quarry, including the excavation of pre-cut workings, movement along the working platforms of the ledge of the transport, breaking the ore with chambers with a bypass to the pre-cut workings, laying of the worked out space with a solidifying mixture with formation the filling array, the chambers are worked out in parts, and the laying is carried out after their working out, and the transport is moved along the remaining part of the working platform.

In FIG. 1 shows the preparation of stocks for excavation; in FIG. 2 - ore production and laying of the mixture in the first layer; in FIG. 3 - preparation for working out the second layer; in FIG. 4 - ore production and laying in the third layer; in FIG. 5 - ore production and laying in the fifth layer; in FIG. b - stock mining order in vertical layers; in FIG. 7 - transport communication during the development of marginal reserves.

The method is carried out as follows. After the opencast mining operations near the margin deposit to the boundary circuit 1, a working platform 2 is formed at the bottom of the quarry, from which underground preparatory-cut workings are carried out: transport adit 3 and unit-races 4. Then, in the ore mass lying above adit 3, from the boundaries of the ore body toward the quarry space, the open chambers are started to be mined in parts, for which the first layer 5 is excavated with its exit to the working platform of ledge 6 (Fig. 2). To remove the layer, wells 7 are drilled, which, as a rule, are drilled from underground workings so as not to interfere with the movement of transport along the working platforms 6 of the ledge (Fig. 3). After blasting, the beaten ore is transferred from the vertical layer to the pre-cut workings 3 and 4 and at the same time they feed the hardening mixture from the working platforms of the ore ledges. The flashing of the next part of the chamber - the second layer - begins after the formation of the filling array of the first layer. Thus, three layers are worked out sequentially, while retaining the pillar 8, which serves to form the backfill array in the third layer (Fig. 4). Ore is produced and transported through the adit by 3 self-propelled loading and delivery vehicles, and

in a quarry, they are loaded onto the transport used in the refinement.

After forming the filling mass in the third layer and gaining the required strength, the supporting pillar 8 is activated. In this case, the contour of the former ore ledge is changed to the contour of the spent fourth layer 9, which is obtained as a result of free flow of the filling mixture.

The stability of the limit side of the quarry is maintained,

The fifth layer is worked out in the same sequence, in which the remaining

ore array 10, which is triggered after formation of the filling array (Fig. 5). This completes the development of the chambers in parts (vertical layers). Open Dock Mining Open

cameras shown in FIG. 6. The processing of open chambers is carried out through a series in the sequence indicated by Roman numerals and taking into account the time of preparation and production of ore, as well as the set of strength

hardening bookmarks of the whole series. Sequential development of the layers of each open chamber under the condition of breaking the next layer after the formation of the filling array in the previous layer

Allows you to save transport communications on the job site.

The proposed method allows for the development of near-margin reserves of near-mine quarry zones without violating

Claims (1)

a transport system of a quarry located on ore ledges, and also to conduct simultaneous mining of both contour and contour reserves of the deposit. The claims A method of mining near-ore reserves in ore zones of a quarry, including. digging underground preparation and cutting workings, moving along working platforms of a ledge of a transport, breaking the ore with chambers with a bypass to preparation and cutting workings, laying the worked out space with a hardening mixture with the formation of a filling mass, different the fact that, in order to reduce the cost of providing transport communication between the horizons of the quarry while maintaining it during the mining of the ledge, the mining of chambers is carried out in parts, and bookmarking is carried out after after their development, and the transport is moved along the remainder of the working platform. f h 6929911 Ј  ig. 7