RU2184850C1 - Method of underground mining of thick flat deposits of low-hardness ores - Google Patents

Abstract

FIELD: mining industry; mining of thick flat deposits of valuable and medium value ores of low hardness. SUBSTANCE: method includes working of chambers in panels by vertical cylindrical holes of large diameter with gravitation delivery of ore. Chambers in panel are worked in two stages with subsequent filling of them with fill material. Holes are drilled with spacing equal to 2/3 of their diameter. EFFECT: highly efficient continuous technology of ore mining with high coefficient of ore recovery. 2 dwg

Description

 The method relates to the development of mineral deposits and can be used in underground mining of powerful gentle deposits of valuable and medium value ores of small fortress.

 There is a method of underground mining of powerful salt deposits with insulated vertical chambers of cylindrical shape, arranged in a checkerboard pattern within a block (panel), which are drilled by drilling rigs from bottom to top with the delivery of salt under its own weight to the recoil drift (RF patent 2150000, MKl. 7, cl. E 21 C 41/20, May 27, 2000).

The disadvantages of this method are:
- loss of minerals in the pillars between the practiced chambers within the block (panel);
- loss of minerals in the interunit pillars;
- unproductive loss of time for moving the drilling rig while drilling each subsequent well;
- the possibility of collapse of the rocks of the loose roof of the chambers during their long standing.

 The objective of the invention is to ensure the completeness of the extraction of minerals from the field, ensuring high efficiency of treatment, the elimination of the collapse of the roof rocks after excavation.

 The problem is solved in that in the method of underground mining of powerful shallow ore deposits of small strength, which consists in mining chambers in panels with vertical cylindrical boreholes of large diameter with gravitational ore delivery, the chambers in the panels are worked out in two stages with their subsequent filling, and the wells are drilled in increments equal to 2/3 of their diameter.

 The use of the invention provides a highly efficient in-line ore mining technology with a high coefficient of ore extraction from the deposit.

 The method is illustrated by drawings of a schematic diagram of the development of a powerful horizontal formation, where Fig. 1 shows a vertical longitudinal section, and Fig. 2 is a horizontal section.

In the presented figures:
1 - development of ventilation and filling horizon;
2 - wells for filing bookmarks in the spent chamber;
3 - rising;
4 - rolling horizon;
5 - the developed space of the camera;
6 - drilled well;
7 - the working body of the unit of vertical action (AED);
8 - ore;
9 - drift chamber drift;
10 - bookmark.

 In the proposed method, ore extraction in the panel is carried out in two stages — by chambers I and II of the same size in the form of continuous narrow high chambers that pass by drilling cylindrical wells of large diameter (up to 8 m) without leaving pillars with a distance between the centers of neighboring wells equal to 2/3 of their diameter. After working off the chamber, it is filled with a hardening bookmark, and stage II chambers are worked out between these chambers after hardening the bookmark. Inter-panel and inter-block pillars are worked out according to the proposed technology after the complete development of chamber reserves.

 The mined panel is prepared by working out of the return horizon 2, uprising 3 and working out of the ventilation and filling horizon 1. The extraction of the first stage chambers is conducted between temporarily abandoned ore chambers of the second stage, and the extraction of the second stage chambers is between the first stage chambers filled with the bookmark. Ore treatment in the chambers of the first and second stages is carried out from the boring delivery drifts of the recoil horizon, in which there are a vertical action unit (AED), a storage hopper and a self-propelled car.

 In the proposed method, the cleaning work in the chambers is carried out in a retreating order from one flank of the panel to another. For the extraction of minerals on the drilling horizon, a drilling rig is installed for sinking rebels (such as "Robbins 121 BR") or a tunneling and mining unit of vertical action (AED). In the process of drilling a well with a diameter of up to 8 m, the trifle under the influence of gravity is delivered to the loading device and enters the storage hopper (type BP-3m) with further loading into a self-propelled car (type 5BC-15). When the formation roof is reached, the drilling rig moves and the drilling process starts again. As a result of working out the vertical layers, a chamber will be formed, which is filled with a hardening tab. At the same time, several chambers may be located depending on a given mine productivity. The extraction of ore within the block is carried out in a specific order. Chambers of the first stage are worked out in an untouched ore mass and filled with a hardening tab. Chambers of the second stage are worked out between chambers filled with a hardening tab, and after ore extraction they are filled with a dry tab.

 The ventilation of the chambers in the process of treatment dredging is carried out due to the mine depression. The considered development system is safe, because the working face workers are located in the drilling delivery workings on a clean ventilation stream.

Claims (1)

 The method of underground development of powerful shallow deposits of small-strength ores, which consists in mining the chambers in panels with vertical cylindrical boreholes of large diameter with gravity ore delivery, characterized in that the chambers in the panel are worked out in two stages with their subsequent filling up, and the wells are drilled with a step equal to 2/3 of the diameter.

Images