As a result of laboratory researches at uniaxial compression of core boring from Tashtagolsk iron-ore deposits it is established that stages of change of the deflected mode of formations confidently marks out by characteristics of electromagnetic issue. The polarisation current, which is arising in the course of deformation of rocks, correlates with changes of characteristics of dynamoelectric transformations. It is established by natural researches on Tashtagolsk iron-ore mine that it is possible to reveal the preparation and the display of geodynamic events, and also to define the character of redistribution of the deflected mode of massif by characteristics of electromagnetic issue.
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