The disadvantage of the open method is that it only allows iron ore to be mined at a relatively small depth. Since it often lies much deeper — at a distance of 600-900 m from the surface of the earth — it is necessary to build mines. First make the shaft shaft, which resembles a very deep well with securely fortified walls. Corridors, which are called stracks, depart from the trunk in different directions. The iron ore found in them is blown up and then its pieces with special equipment are raised to the surface. This method of extracting iron ore is efficient, but at the same time is highly hazardous and costly.
There is also another way for iron ore to be mined. It is called SRS or borehole hydro production. The ore is extracted from the ground as follows: drilling a deep well, lowering pipes with a hydromonitor and using a very strong water jet, crushing the rock and then lifting it to the surface. This method is safe, but unfortunately it is not effective yet. This method only produces about 3% of iron ore, while mines produce approximately 70%. However, specialists are engaged in the development of the method of well hydraulic production, and therefore it is hoped that in the future this option will become the main option, displacing quarries and mines.