Abstract
The Tolbachan suite presents the complex mining and geological conditions for development the Mir primary diamond deposit at depths of 1000 to 1400 meters. The resumption of mining operations at the field requires a comprehensive study of host rocks, especially in the formation intervals of high-pressure reservoirs of mixed fluid saturation. The study of lithological features and determination of the main physical and mechanical parameters of the formation were carried out in 2020–2021 using standard methods based on core samples of experimental wells. As a result of the studies, the main lithological types of rocks of the Tolbachan Formation were described, and the stratification of the strata according to physical and mechanical properties was performed. The conducted studies allow characterizing the mining and geological conditions for the construction of underground mine workings, as well as to predict the main negative factors affecting the mining operations at the deposit.
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