The instability of highwall slopes, exposed to thawing, in open-pit coal mines in permafrost regions is described. Remedial measures are proposed to prevent shallow as well as deep slope failures in these regions. It is shown that by introducing a wide bench in the highwall at the bottom of the permafrost layer and by proper designing of interbench slope angles, and equipment distance from slope crest, such failure can be avoided or minimized.

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