The attestation of salt extraction in these areas was located in the Geto-Dacian period at Oituz and Târgu Ocna. The oldest written testimony dates from 1380. The mining works that serve the Trotuş mine within the Tg. Ocna Salt Mine, are located in the Feţele Târgului salt massif located near the town of Tg. Ocna, on the left side of the Trotuş river. The exploitation of the salt was carried out until 1870 at the Ocnița Mine with a bell-shaped chamber and continued in the Moldova Veche and Moldova Nouă mines with trapezoidal chambers. Since 1967, the salt has been exploited with "small rooms and abandoned square pillars". The exploitation is carried out descending, on the horizons. Currently, the Trotuș Salt Mine has 14 horizons: 2 at the Pilot mine and 12 at the Trotuș mine. The specialized 3D CANVENT program was used to establish the optimal distribution of air flows. A number of 492 junctions and 697 branches were used to solve the ventilation network related to the Trotuș Salt Mine.

Important information for drawing up the risk scenario and the plan for preventing spontaneous ombustion in coal mines are provided by knowledge on the coal’s self-ignition tendency gained from laboratory determinations carried out for establishing self-ignition parameters and for the classification of coal from this point of view. This paper provides an analysis on the concerned preventive triangle: a classification on the selfignition risk, applications of preventive methods in coal mining thermography and the instrumentation of inhibiting water solutions as measures for preventing coal self-ignition.