English to Russian Other Mining & Minerals / Gems горное дело (уголь)

Slim core data
It would appear, based on the data presented, that the slim cores were subjected to the following testing programme:
The coal was sampled into separate raw coal ply samples.
Individual plies were analysed or combined with adjacent samples.
***Raw plies*** or combined raw plies were analysed to varying extents for moisture, ash and density.

рядовые слои? слои рядового угля?
Буду очень признательна за правильный термин.