CLOSURE OF POTASH AND SALT MINES: REVIEW AND ANALYSIS OFTHE PROBLEM

A burning problem connected with planned closure of depleted potash and salt mines is surveyed in the article. Mine closure can be dry and wet. Sometimes mined-out voids can be used for non-mining purposes (disposal of waste, storage, recreation, etc.). The international experience gained in mine closure shows that the majority of mines are closed after accidental inrush of fresh water in mined-out stopes. The cause and consequences of accidents connected with entry of fresh water and brines in underground excavations are analyzed. The world’s practice indicates that the most reliable method of mine closure at stable ground surface above water-dilutable ore deposits is backfill of stopes with flooding of voids with brines. In this case, the probability of fresh water entry from aquifers is minimized, whereas hydraulic pressure of brines in mined-out voids reduces deformation of ground surface. In the wet closure method, it is require to model mine flowing, estimate dissolution of load-bearing elements of the mine system as well as to predict anticipated deformations of ground surface and probability of discontinuity of in impermeable strata. Based on the estimates, it is decided on either point or spread filling of voids with brines. In excavations in carnallite rocks, it is recommended to use brines saturated with MgCl2. The integral element of mine closure is the long-term integrated monitoring of processes running during mine closure. The monitoring makes it possible to minimize adverse effect of mine closure on the environment.


Acknowledgements: Section 6. Wet Mine Closure Monitoring was supported by the Russian Science Foundation, Project No. 19-77-30008.


For citation: Baryah A. A., Evseev A. V. Closure of potash and salt mines: Review and analysis of the problem. MIAB. Mining Inf. Anal. Bull. 2019;(9):5-29. [In Russ]. DOI: 10.25018/0236-1493-2019-090-5-29.

Keywords

Salt mine, potash mine, mine closure, flooring, water inrush, deformations, sinks, monitoring, control.

Issue number: 9
Year: 2019
ISBN: 0236-1493
UDK: 622.363
DOI: 10.25018/0236-1493-2019-09-0-5-29
Authors: Baryah A. A., Evseev A. V.

About authors: A.A. Baryah, Corresponding Member of Russian Academy of Sciences, Dr. Sci. (Eng.), Director, Perm Federal Research Center of Ural Branch, Russian Academy of Sciences, 614007, Perm, Russia, e-mail: bar@mi-perm.ru, A.V. Evseev, Cand. Sci. (Eng.), Researcher, Mining Institute of Ural Branch, Russian Academy of Sciences, 614007, Perm, Russia, e-mail: evseev@mi-perm.ru. Corresponding author: A.A. Baryah, e-mail: bar@mi-perm.ru.

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