Nosov Magnitogorsk State Mining University, Magnitogorsk, Russia:

S. E. Gavrishev, Director of the Institute of Mining and Transport, Head of Chair, Doctor of Engineering Sciences, ormpi-cg@mail.ru
A. N. Rakhmangulov, Professor, Doctor of Engineering Sciences
K. V. Burmistrov, Associate Professor, Candidate of Engineering Sciences
V. Yu. Zalyadnov, Associate Professor, Candidate of Engineering Sciences

Lysogorsk deposit of roofing slates is one of the largest in the Ural. The deposit is composed of coarsefiber, medium- and fine-fiber slate. A feature of the Lysogorsk deposit is the presence of quartz and carbonate-quartz veins. The thickness of the veins and inclusions varies from the first meters in swells to the first centimeters in twitches. Sometimes quartz vein zones with a thickness of 6–15 m are observed. The veins are localized mainly in coarse-fiber slates and are practically absent in fine-tomedium-fibrous slates. Since the marketable products should be free from overburden and gangue, slate containing carbonate-quartz material is subject to selective excavation and separate accounting in the form of operational losses. The deposit uses two technologies for the extraction of mineral resources. The best part of slates is extracted with drilling and blasting to obtain raw materials used as surface dressing of roofing materials. Fine-fiber and medium-fiber slates are partially developed using diamond-rope equipment in order to obtain blocks used for the production of roofing tiles. The features of the Lysogorsky deposit, the mining technology as well as the requirements of legislation and consumers to the quality of raw materials make it necessary to develop methodological recommendations for justifying mining parameters and determining losses during production of roofing slates. The existing industry regulations and methods for determining mineral loss do not allow us to determine the volume of possible slate recovery at the sites of inclusions of carbonate-quartz dyke and the estimate the volume of loss of the mineral. The authors of the article develop a method for justifying the parameters of excavation blocks and calculating slate losses, which takes into account different combinations of incline angles of contact interfaces of single quartz inclusions and veins with respect to the direction of mining advance, as well as the parameters of drilling and blasting in preparation of rocks for excavation. Based on the calculations performed, the recommendations are given on the planning of annual volumes of mining operations for the exposed sections of the field. It is determined that the loss standards are 21.2% for the horizon of 584 m and 15.8% for the horizon of 578 m. To justify the loss for the underlying levels, it is recommended to use the developed method for determining the width of the excavation blocks and the losses.

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