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The method for exploiting the coal layers by using the crazing and submitting the roofs of the mining works from the underground is an alternative applied on large scale into the brown coal mines from the main coal basin Jiu Valley situated into the S-W of Romania. The technology of individual supporting – by using the open circulation hydraulic props together with the linked metallic bars with blocking bolts and wedges, assume some great physical efforts and the factor of working security is not totally assured...

The transport represents one of the main sides of the mining technological process, the preponderance of the expenses of this activity reported to the expenses for producing a tone of useful mineral substance extracted from the underground reaching almost 40\%. A good transport system presumes to assure a permanent continuity with passive time cycles having minimum values and functioning in well correlated cascade dimensionally and capacitive speaking. It’s obvious that a transport flow is performing if starting...