One of the most important geological factors that determine the properties of the rocks are terms of sedimentation. In order to study the influence of the sedimentation terms on the natural moisture research of quantitative moisture content in the Donbas carbon sandstones of different lithogenetic types – channel sands (R), sandstone of underwater rivers offsets (PVR), sandstones of offsets underwater rivers with signs of channel (PVR-R), sandstones offsets underwater rivers with signs of coastal-marine (PVR-PM), coastal-marine sandstones (PM) were conducted out. Quantification of the moisture content in the rocks can be characterized by absolute or relative humidity degree. Humidity expressed in relation to the weight of oven-dry rock is the absolute humidity. it is usually called the index of the weight humidity or mass humidity. Relative degree of humidity is the degree of pore filling with moisture and is defined as the ratio of the water content in the rock to the volume of pore space.

The obtained results of research are suggested the following conclusions:
− natural moisture of sandstones is connected with the primary conditions of their sedimentation and increases with the improvement of sorting and reducing size of the constituent material;
− natural sandstones moisture increases in the row from run-of river to outstations underwater rivers and coastal-marine, which is one of the factors determining the reduction of sandstones outburst in the same row;
on the natural moisture of sandstones, including high-grade coals, primary sedimentation conditions have less effect than on the natural moisture of sandstones including coals of low stages of metamorphism.

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1. Preliminary manual on the method of regional prediction application of outburst hazard of Donbas rocks accordingly to geological exploration data. 1973. Dnepropetrovsk, IGTM AN USSR, 49 p. (In Russian).
2. Zabigaylo V.Ye., Shirokov A.Z., Belyy I.S. [et al.], 1974. Geological factors of Donbas rocks outburst hazard. Kyiv, Naukova dumka, 272 p. (In Russian).
3. Kuznetsov I.A. (edit.), 1963. Geology of coal deposits and slate coals of the USSR: in 12 vol. Coal basins and deposits of the south in the European part of the USSR. Мoscow, Gosgeoltekhizdat, V. 1, 1209 p. (In Russian).
4. Zabigaylo, V.Ye., Lukinov V.V., Shirokov A.Z., 1983. Outburst hazard of Donbas rocks, Kyiv, Naukova dumka, 288 p. (In Russian).
5. Strakhov, N.M., 1962. Basic theory of lithogenesis: in 2 v. Мoscow, Аkademya nauk USSR, V. 2, 574 p. (In Russian).