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The mica deposit mining method has open-pit mining method and underground mining method. Most of the deposits of industrial raw material mica with a reserve of less than 200t are open-pit mining.
The division of the scale of mica deposits has not yet been regulated. Generally, the annual mining ore volume is between 60,000 and 100,000 tons, and the service life is 10 to 6 years. It is a large-scale mine, and its industrial raw material mica yield is 90-200t/a. The amount of mined ore in the mica deposit is a small mine compared to other minerals.
Open-pit mining of mica deposits is commonly used for road development, slope improvement and trenchless development. Due to the small amount of mining, the road development has increased the use of 5t dump trucks, and the slopes have been upgraded and used to improve the trucks.
Underground mining often uses inclined wells to develop or develop flats.
Due to the small scale of mining and simple process, the open-pit mining uses the 01-30 hand-held rock drill for rock drilling, and also uses a down-the-hole drilling rig with a hole diameter of 80mm or 100mm. The blasthole arrangement should avoid the mica rich belt. After blasting, the mica ore is manually selected on the working surface and the excavator with 0.5m 3 bucket capacity is loaded. 5t dump truck for working face transportation.
Underground mining compared to other non-metallic minerals has its own peculiarities. Since the mica ore and surrounding rock are hard and stable, all the mining methods such as the retention method, the filling method and the comprehensive method are adopted. Due to the high value of mica, the mica crystals are manually selected on the working surface and concentrated.
In order to protect the mica crystals, sorting measures should be taken when dropping the mine. For the giant crystal mica belt which is integrated and stabilized near the top plate, the hole is 0.3~0.6m away from the ore body during rock drilling, and then the bottom of the giant crystal mica belt is pulled down. The blasthole contains a small amount of explosives, so that the mica belt after blasting is presented. Loose state, with the tip of the tip, for the discontinuous disseminated ore body according to the mica distribution law of the working surface, do not damage the mica crystal as the principle, choose the location of the blasthole, such as drilling to a certain depth after encountering mica Crystals can't continue to be eye-catching, and consider whether the blasthole is loaded. The operation of ore in the working face cannot be carried out with antimony ore equipment.
The mining process of the mica deposit is to drill, blast, manually move to the mining patio, artificially fill, and the mine leaks to the mine car located in the transportation lane.
Mining of mica resources
The mining characteristics of mica deposits are: product industry requirements and prices demand for mining, mica is expensive, the larger the area, the more expensive it is. The mica crystals are protected from damage during mining, and the mining face cannot be used for mica equipment; mica The mining volume of ore is small, and it is in a remote mountainous area. The mining method is simple. The “mica broken†accumulated in the mica deposit has become the target of mining and utilization in recent years.