Contact-metamorphic changes of coal at the Kayerkanskoye field

Abstract

At the Kayerkanskoye field, a comprehensive study was carried out of the alteration of coals in seams X and IX (Daldykan Formation, P ) at contacts with dolerite dikes in order to determine the nature of the relationship between the size of intrusions and the near‑contact zones of altered coal, as well as the characteristics of contact‑thermal metamorphism of the coal. At different distances from the contacts with dikes, changes in the values of the main coal parameters were traced: ash content, volatile matter yield, calorific value, carbon content, specific gravity, reflectance, and microhardness.

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