The comprehensive mining method is characterized by the fact that the working face moves along the ore body or along the inclined surface. The exposed area of ​​the stope is large, and the operation is carried out under the exposed roof. In the process of mining, the lean or stone in the ore body is generally left behind. If it is not taken, it will play the role of the pillar to maintain the goaf. These so-called pillars are irregular and generally no longer recover. If the recovery of precious and rare metals can also be manually set up the pillar without leaving pillars.
Comprehensive mining method: the gently inclined ore body is divided into 15 to 30 m vertical height, and the stage length is 40 to 60 m. The top and bottom columns of 2 to 3 m are left between the stages, and the ore is still 50 to 60 m. The bearing area of ​​the stope can generally reach 1000~2000m 2 . When the forward recovery sequence is adopted, the stage transportation roadway should be ahead of the mining working surface by 30 to 50 m.
This mining method can be divided into two types: intrapulmonary and extrapulmonary. In the excavation stage, the roadway is transported. In the stage, 1~2 uphills are taken as free faces. The bottom of the bottom column is opened every 5~6m. On the other side of the transport roadway, the electric winch winch chamber is set every 20m.
The recovery sequence can be forward or reverse. The cut-off of the mountain in the ore can be spread to one side or both sides. For ore bodies below 3m, the comprehensive mining method is generally used for single-layer mining. When the thickness is large, it is layered with positive steps. The layering height is 2~3m, and the upper layer is 3~4.5m ahead, so that the bolt support can be carried out when necessary. . The falling mine adopts shallow hole rock blasting, and the hole depth is 1.2~3m. When the ore body thickness is small, it can be transported by electric raft. When the ore body is thick and the inclination angle is also small, the ore can also be transported by the trackless self- equipment . The transport distance is less than 200-300m, and the scraper of 20t or more is used. When the transport distance is larger, the dump truck can be used for 20~60t. Loader kit.
About baby necklace
Did mothers find out the babies always pull our hair or clothes when we hold them? Because baby's teeth are growing. We will be embarrassed when baby pull our hair or clothes in public. At this time, the appearance of Silicone necklace relieve the embarrasse of the mothers. The mothers can make necklace by themselves, whatever as a teether or jewelry.It can be easy to carry and ease uncomfortable feeling of teeth growing anytime. Well, silicone beads are very popular in mothers crowd all over the world.
Product introduction:
1.Product name:Silicone Beads,silicone necklace teether,silicone teething necklace baby,silicone chew necklace,teething necklace food grade silicone,silicone baby teether bead
2.Place of origin:Guangdong China
3.Color:any pantone color
4.Logo:Printing,debossed,embossed
5.MOQ:500pcs.
6.Package:1 pcs/opp,customized design is available.
7.Design:Customized/stock
8.Certification:FDA,LFGB,SGS,ROHS,etc.
9.Usage:exersise baby's chewing
10.Silicone teething beads photos for reference.
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