Shallow hole room column mining For the mining or horizontally inclined ore body, the mining room and the pillars are alternately arranged in the ore block, and the mining room is first, and the continuous or intermittent regular pillar or discontinuous pillar is used to maintain the roof of the goaf. These pillars are generally not recycled. Only when the ore is expensive or of high grade, some or all of the recovery is considered in the later stages. The ore is mainly transported by electricity. It is more versatile than the comprehensive mining method, which not only recovers thin ore bodies, but also recovers thick and extremely thick ore bodies. (1) Mining area layout and structural parameters (see figure) In general, several mining areas are divided along the ore body. In the mining area, 5 to 7 ore blocks are generally divided; in some cases, it can be increased to 8 to 10 ore blocks, or to 3 to 4 ore blocks. When the length of the ore body is short and the scale is small, the mining area and the pillar can be directly divided into mining areas and pillars. In order to ensure safety between the mining areas, a continuous permanent pillar must be left. § The arrangement of the nuggets is basically affected by the direction of the antimony ore, that is, the long axis of the mine is arranged along the inclined direction of the ore body. Sometimes due to the occurrence of ore bodies, the long axis of the mine is sometimes arranged along the strike. §1) Stage height: 15~25m, no longer divided into sections; when the height is 30~50m, it is generally divided into 2~3 sections; § 2) The slant length of the nugget is mainly limited by the electric transport distance, generally 30~60m; § 3) Length of mining area: 30 ~ 80m, 5 ~ 7 mining houses; § Mine width: generally 6 ~ 12m; § 4) Room pillars generally use round and square pillars. Its pillar size, circular diameter 2 ~ 5m, square is 3 × 3 ~ 4 × 4m. The spacing of the pillars is 5-8 m, and the individual spacing is 8-12 m; § 5) The width of the top column is generally 1~3m; the width of the mining column is 4~6m; §6) The width of the bottom column is generally 2.6 ~ 7.0m; Shallow hole retention method Workers work directly on the retained ore piles under the exposed surface of the mine, and stratify and recover from the bottom to the top. Each time about 1/3 of the ore is discharged, the bottom of the ore is released from the bottom of the ore, and the rest is temporarily retained in the mine. Continue to pick up the work platform. After all the mining houses have been harvested, the ore that has been retained in the mining room will be released in large quantities, that is, a large amount of ore is released. This mining method is suitable for mining steep ore deposits with stable ore and surrounding rock, no pyrophoric ore, no oxidation and no agglomeration. (1) Nugget structure and parameters • Stage height: 40~60m; • Length of the nugget: 40～60m (or the thickness of the ore body); • Size of the pillar: 3~6m for the top column, 4～14m for the bottom column; 8～12m for the width of the column (2) Precision cutting • The mining and cutting engineering mainly includes: along the pulse roadway, the mining patio, the mining roadway, the electric roadway, the bottoming roadway, the funnel and so on. • 1) The standard patio is generally arranged in the column. The specification is 1.5～2.0×2.0～2.5m2. Every 4~6m, the pedestrian crossing road with a section of 2.0×1.5m2 is connected to the stope. The pedestrians at both ends of the stop are connected. The lanes should be staggered. • 2) The arrangement of the bottom structure, mainly consisting of the bottom structure of the electric bismuth mine with funnel ore and the bottom structure of the self-reproducing mine. • When adopting the funnel to release the bottom structure of the miner's ore mine, along the length of the mine, about 3 to 4 m above the transport roadway, the electric raft with a specification of 2.0×2.0 m2 is cut. One side of the electric roadway is provided with an electric winch chamber of 3 to 4 m in length, 3 m in width and 2 m in height. A section of the electric shovel on the side of the diverticulum is 2.0×2.0m2, and the mine is connected to the transportation lane. The funnel neck is opened in the bottom column with a spacing of 5 to 7 m. (2) Cutting of nuggets • The cutting work of the nuggets includes bottoming and leaking. • The bottom is to open up the free surface for the mining work, that is, the bottom of the road is extended to the sides, and the bottom of the whole mine is pulled open. The height of the bottom is 2~2.5m. • Leakage is to create conditions for the mine, and the mouth of the funnel is turned into a trumpet shape. (3) Recovery • Use bottom-up stratified recovery to perform operations such as collapse, ventilation, partial ore deposits, flat field and turquoise treatment in each stratification. The working face of the mining face is mostly the layout of the ladder, and the rock for the recovery mining adopts the upward or horizontal rock drilling method. The upward blasthole is generally inclined forward by 750 to 850; the horizontal blasthole is generally raised by 500 to 800. When hitting the blasthole, the length of the step of the working face of the step is generally 10~15m; when the horizontal blasthole is used, the length of the step is generally 2~4m, and the height of the step is 1.2~2m. • Partial ore discharge generally releases about 30% of each ore collapsed, so that the mining face is maintained at 2 to 2.5 m. After partial ore release, the roof of the mine and the rock of the upper and lower plates should be inspected immediately, and the pumice should be treated at the same time to level the site. When the mine is harvested to the top column, a large amount of uniform ore is carried out. The Portable Ground Control Statioin with Dual Screend and Dual Operating System Windows/Android, Support 14 CH input/output, HDMI video link for realtime monitoring,Maximus 30km Control Range. Portable Uav Ground Station,Drone Control Station,Uav Ground Control Station,Drone Ground Control Station,Drone Ground Control System shenzhen GC Electronics Co.,Ltd. , https://www.jmrdrone.com