The mining technology (ore mine) has not been studied in detail at this stage, and it will be elaborated after further studies.
1. Mining Method
It is projected that mining of the site reserves will utilize underground method. This mine field is special in terms of its rather deep occurrence of the minerals (which excludes the possibility of open cast mining due to technical and economic reasons), high abundance of water in overlaying water beds, presence of facilities on the earth surface (human settlements, electric transmission lines, water intake facilities, etc.).
2. Development of the Ore Minefield
The most expedient method of development of the ore mine section is vertical well bore mining. This method ensures the minimum length of mine openings, lower mine footage, and more reliable damp proofing of well holes.
It is projected to develop the ore minefield with two vertical well bores: one is the air supply type, and the other – ventilation type.
Well bore No. 1 serves to deliver people, materials, and equipment down the hole and to supply fresh air into the ore mine. The well bore is equipped with two cage hoists.
Well bore No. 2 serves to lift the mined rock to the surface, as well as to release return ventilation air from the ore mine.
The well bore is equipped with two twin-skip systems and one cage hoist (inspection cage).
The shaft site (and the entire mine site) is at a side of the minefield and it was determined based on the totality of factors: Mining-and-geological, mining-engineering, socio-economic, and environmental ones. The planned capacity of the well bores and such mining equipment is around 7.5 million tons of ore per annum. Off end disposition of the mine site ensures:
- Minimized amount of reserves left in the solid under the mine site, which conforms to the current regulations of the Russian Federation pertaining to conservation of resources and sustainable use of mineral raw materials;
– Off end disposition of the mine site provides for location of tail facilities, slurry storage outside of the ore deposit and thereby reduces the cost of construction and maintenance of such facilities in operable condition due to exclusion of the need for environmental protection measures as a consequence of mining operations.
3. Choice of the Mining Method
Choice of the most suitable mining systems for specific mining-and-geological conditions will be defined by the totality of natural factors, in addition to safety and security and reliability of the system, performance of the mining system, completeness and quality of recovery of the reserves, scope of development and face-entry drivages, requirements to stowing operations, cost of ore production, etc.