Safety regulations for open-pit mining

2026-01-09 11:00

The safety regulations for open-pit mining included many aspects: ** I. Safety Requirements for the Formation of Steps ** 1. ** Production bench height **: There is a clear regulation. If the height of the bench after the completion of mining exceeds the regulation, it needs to go through technical demonstration and be determined by the design on the premise of ensuring safety. 2. ** Explosive pile height during shoveling **: When shoveling with an excavator or a shovel, the explosive pile height should not be greater than 1.5 times of the maximum excavation height of the machine. 3. ** Regulations on non-working steps **: The final slope angle and minimum working platform width of non-working steps shall be specified in the design. Mining and transportation equipment, transportation routes, power supply and communication lines shall be set within the stable range of the working platform. The distance between the edge of the explosion pile and the central line of the standard gauge railway shall not be less than 2.5m, the distance between the edge of the explosion pile and the central line of the narrow gauge railway shall not be less than 2.0m, and the distance between the edge of the explosion pile and the edge of the car road shall not be less than 1m. ** II. Safety Requirements for Piercing Operation ** 1. ** When the drilling machine stabilizes the vehicle **: It should maintain a sufficient safe distance from the top line of the step slope. The minimum distance between the center of the jack of different types of drilling machines and the top line of the step slope is different (for example, the distance between the jack center of the trolley is 1m, the distance between the roller drill, the down-the-hole drill, and the wire rope impact drill is 2.5 m, and the distance between the soft rock mass and the rock mass is 3.5 m). There should be no cushion stone under the jack to ensure the stability of the step slope. No one should be on the platform when the drilling machine is working. Non-operating personnel should not stay around. The drilling machine and the electric shovel near the bottom line of the slope should not work at the same time. If the machine is shut down for a long time, cut off the power supply on the machine. 2. ** When drilling the first row of holes **: The angle between the central axis of the drilling machine and the top line of the step slope should not be less than 45°. 3. ** When the drilling machine is walking near the edge of the step **: Check whether the walking route is safe. The minimum distance between the protruding part of the outer side of the drilling machine and the top line of the step slope is stipulated for different types of drilling machines (for example, the minimum distance between the protruding part of the outer side of the trolley and the top line of the step slope is 2m, and the minimum distance between the protruding part of the outer side of the roller drill, DTH drill and wire rope impact drilling machine and the top line of the step slope is 3m). 4. ** When the drilling machine is moving **: There should be someone under the machine to guide and supervise it. It is not advisable to walk on the slope with a slope of more than 15°. If it is more than 15°, put down the drilling frame, assign someone to command and take anti-overturning measures. When walking, the driver should honk first. No one should be in front of or behind the track. No one should make a 90° sharp turn or walk on soft ground. When passing through high and low voltage lines, a sufficient safe distance should be maintained. No one should stay on the slope for a long time. No one should walk far away at night without sufficient lighting. Non-operators should not be in dangerous areas when lifting and landing the drilling frame. ** 3. Other aspects ** 1. ** Stripping ratio inspection **: The inspection content includes the mining ratio of the mine. By checking the design and production data and inspecting the mining situation on the spot, the inspection shall be carried out according to the Notice of the State Administration of Mine Safety Supervision on Carrying out the Special Rectification of Production Safety in Open Pit Mines, focusing on the serious imbalance of mining and stripping without taking any treatment measures. 2. ** Regarding underground to open pit mining **: When underground mining is converted to open pit mining, the goaf and karst caves must be explored, and the goaf and karst caves that pose a threat to the safety of open pit mining must be handled according to the design. When there are abandoned tunnels and goafs that threaten open pit mining, targeted safety precautions must be taken in advance. When open pit mining is carried out within the scope affected by underground mining, effective safety technical measures should be taken. 3. ** Safety platform and cleaning platform **: Safety platform and cleaning platform should be set up in the open-pit according to the design. 4. ** Working slope angle and step height **: The working slope angle shall not be greater than the designed working slope angle. The final side slope step height shall not exceed the designed height. The height of the production step shall comply with the relevant regulations. 5. ** Equipment, materials, and craftsmanship **: You cannot use equipment, materials, or craftsmanship that is prohibited by the country. 6. ** Mining sequence **: The top-down mining sequence should be divided into steps or layered mining. Small open-air quarries should adopt the step mining. If the step mining cannot be adopted, the top-down layered mining sequence should be adopted. The slicing height, maximum mining height and final slope angle of slicing mining in small open quarry shall be determined by design. The number of slices and the maximum mining height have different restrictions under different blasting operation methods. The width of the drilling platform for slicing mining shall be determined by design, and the minimum width of the drilling platform shall not be less than 4 meters. The minimum distance between adjacent quarries should be more than 300 meters. If you want to know more about the follow-up, click on the link and read it!