Mixed work-face narrow vein mining

Authors: Cheban A. Yu.

Considerable resources of noble and nonferrous metals concentrate in narrow and thin ore bodies. Commercial reserves of valuable minerals can also occur in narrow and very narrow veins. This fact necessitates development of equipment and technologies for selective mining of such bodies. In order to reduce the loss and dilution of valuable minerals during mining, and to increase the recoverability of metals in further processing, sometimes, at the stage of mining, it is required to ensure highly selective extraction of rich ore. At the present time, blastless technologies are being developed for highly selective ore extraction with the continuous quality control at the enhanced mining safety and minimized ecological impact. Mechanization of narrow vein mining using shearers, drilling machines and chain-type machines, hydraulic hammers and other mining equipment is analyzed. This article proposes a technology for mining narrow and steeply dipping veins and contact mineralized rocks using a shearing machine with cutting and percussion tools. The technology provides mixed work-face mining with bottom-up selective slicing and dry backfill. The cutting tool loosens a narrow vein and makes a groove which facilitates further shearing of ore by the percussion tool mounted on an extendable boom. The proposed technology and equipment enables advanced local milling of rich ore at maximum preservation of the initial quality of valuable minerals, and ensures essential reduction in energy requirement of mining operations.

Keywords: valuable minerals, selective mining, shearing machine, cutting and percussion tools, ore mass, dilution loss, productivity.
For citation:

Cheban A. Yu. Mixed work-face narrow vein mining. MIAB. Mining Inf. Anal. Bull. 2021;(6):145-152. [In Russ]. DOI: 10.25018/0236_1493_2021_6_0_145.

Acknowledgements:
Issue number: 6
Year: 2021
Page number: 145-152
ISBN: 0236-1493
UDK: 622.271
DOI: 10.25018/0236_1493_2021_6_0_145
Article receipt date: 02.07.2020
Date of review receipt: 16.10.2020
Date of the editorial board′s decision on the article′s publishing: 10.05.2021
About authors:

A.Yu. Cheban, Cand. Sci. (Eng.), Leading Researcher, e-mail: chebanay@mail.ru, Mining Institute, Far Eastern Branch of Russian Academy of Sciences, 680000, Khabarovsk, Russia.

 

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