10 results about "Stripping ratio" patented technology

The invention belongs to the technical field of surface mines, and particularly discloses a large surface mine slope angle optimization method based on rock mass quality, which is used for analyzing engineering geological conditions, slope stability conditions and development trends of rock mass by surveying earth surface engineering geology of a mining area. Investigating and counting the mine slope rock mass, and determining a sampling interval and a drilling scheme according to a pre-feasibility research report; drilling and acquiring parameters corresponding to drilling samples, and grading the rock samples in the mining area according to the parameters of the drilling samples and a grading method; carrying out plane and vertical partition on the mining area slope, and calculating rock mass mechanical parameters of each area and lithology; establishing a small slope three-dimensional model according to an open-pit mining boundary, changing a slope angle, and calculating a safety coefficient to meet a predetermined specification so as to determine a maximum slope angle; an overall slope model is established, the maximum slope angle is set, and the safety coefficient is calculated to take the slope angle of the vertical partition which is improved to the maximum degree as the recommended slope angle. The method has the advantages of being simple, high in operability, stable in slope and low in stripping ratio.

A method for determining a mining value of a leucogranite-hosted uranium deposit, including: determining average uranium grade, uranium occurrence, average uranium recovery rate, and uranium stripping ratio of the leucogranite-hosted uranium deposit in an exploration region, wherein the average uranium recovery rate is a ratio of a uranium recovery amount after hydrometallurgy to a total uranium amount, and the uranium stripping ratio is a ratio of an amount of rock to be stripped to a uranium ore amount in a mining process; and determining the mining value of the leucogranite-hosted uranium deposit in the exploration region, wherein the mining value of the leucogranite-hosted uranium deposit is determined based on one or more of the average uranium grade, the uranium occurrence, the average uranium recovery rate, and the uranium stripping ratio.

This invention discloses a mining method for achieving a balanced stripping ratio, comprising the following steps: S1, determining the bench height: Based on rock properties, structure, drilling, and blasting methods, the final slope angle of the bench is determined. Further, based on the final slope angle, the width of the safety platform and the bench height are designed, resulting in the combined bench height H; S2, determining the bench height L based on the specifications of the stripping equipment, production safety requirements, and mining technology. Generally, the final slope can be divided into sections with 2-3 bench heights; S3, adjusting the combined bench H to be formed by combining two benches h1, thereby increasing the bench height. This invention effectively controls the amount of stripping in spatial location, enabling the mine to operate with a relatively stable stripping ratio over a longer period, ensuring sufficient secondary ore reserves, improving the efficiency of the mining machinery, reducing the number of benches from three to two, decreasing the frequency of frequent equipment adjustments, and increasing effective operating time.

The present disclosure provides a method for establishing an optimal boundary of an open-pit mine and formulating a mining plan, including: obtaining geological exploration data, and establishing a three-dimensional model and a pit model; performing a single stripping and mining simulation operation on the pit, and calculating the stripping ratio; in response to the stripping ratio being greater than the limit stripping ratio, adjusting the shape of the mining slope until the stripping ratio is less than or equal to the limit stripping ratio, and continuing the next stripping and mining simulation operation; until the termination condition is reached, outputting the optimal boundary of the pit. By establishing a three-dimensional model and a pit model of the target open-pit mine, and performing stripping and mining simulation, and by setting the limit stripping ratio, the optimal boundary of the pit under the limit stripping ratio can be determined quickly and accurately. Compared with the prior art method of determining the optimal boundary through a limited number of schemes, this technology realizes a method for theoretically obtaining the optimal boundary of an open-pit mine, and through the corresponding optimization algorithm, the feasibility of this technology is realized, greatly improving the actual economic benefits of open-pit mining.

The invention discloses an intrusive mining method for a deep open-pit mine. The intrusive mining method comprises three main steps of super-stripping and super-drainage, horizontal pushing and inner drainage, and top mining and reverse drainage. In the overstripping process, the original inclined goaf bottom plate is changed to be horizontal, so that an internal dumping condition is created for mining of the whole concave area, and the external displacement and the cost are reduced; in the over-drainage process, redundant stripped materials are temporarily stored in a mining area, internal drainage can be achieved through reverse drainage subsequently, and land resource occupation caused by external drainage is avoided; the horizontal pushing inner row realizes the horizontal pushing of the concave area, and the management mode is recovered before passing through the concave area, so that the management difficulty is reduced, the lifting mining or downward mining of the equipment is avoided, and the use efficiency of the equipment is improved; in the upward mining and reverse discharging process, the secondary stripping super-discharging dumping site is backfilled to the downward concave area, so that the stripping ratio and the dumping space are balanced, the capacity of mining equipment is fully utilized, and the safety problem caused by the idle goaf is avoided; and various problems confronted by the current concave area are avoided by adjusting the correlativity of the stripping row in time and space.

This invention discloses a combined horizontal and fan-shaped turning method for open-pit mines in inclined coal seams, comprising five steps: cross-area expansion, horizontal pushing for production maintenance, fan-shaped linkage, new area preparation, and backfilling and leveling. The horizontal pushing for production maintenance and the fan-shaped linkage are carried out simultaneously in shallow and deep coal seams, effectively balancing the stripping ratio and avoiding sudden increases. The close integration of these processes ensures an effective working line during the turning process, guaranteeing continuous mine production. The spoil heap can be moved in and out as the process progresses, avoiding insufficient spoil heap space. The goaf released by the fan-shaped linkage is minimized, effectively avoiding large-scale long-distance transportation of stripped materials at the end of the process. Each stage of the process is carried out in different areas of the open-pit mine, avoiding safety management issues caused by excessive equipment concentration. The overall method combines the advantages of traditional right-angle turning and fan-shaped turning.

This invention discloses an invasive mining method for deep-pit open-pit mines, comprising three main steps: over-stripping and over-drainage, horizontal pushing and internal drainage, and top-mining reverse drainage. In the over-stripping process, the originally inclined goaf floor is transformed into a horizontal one, creating internal drainage conditions for mining the entire depressed area and reducing external drainage volume and costs. In the over-drainage process, excess stripped material is temporarily stored within the mining area, and subsequent internal drainage can be achieved through reverse drainage, avoiding land resource occupation caused by external drainage. Horizontal pushing and internal drainage achieves horizontal advancement of the depressed area, restoring the management mode to its pre-depression state, reducing management difficulty, avoiding overhead or downward mining, and improving equipment utilization efficiency. In the top-mining reverse drainage process, the secondary stripping and over-drainage waste dump is backfilled into the depressed area, balancing the stripping ratio and drainage space, fully utilizing mine equipment capacity, and avoiding safety issues caused by idle goaf areas. By adjusting the temporal and spatial correlation between mining, stripping, and drainage, various problems currently faced when mining through depressed areas are avoided.

The invention discloses a subarea mining strip mine secondary stripping end slope angle steepening method which comprises the following steps: firstly, dividing a reinforced area, then, carrying out comprehensive reinforcement in a layered and staging manner, then, carrying out drainage, and finally, carrying out monitoring. According to the invention, through experiment and numerical simulation, the engineering construction accuracy is effectively improved; layered and staged comprehensive reinforcement is carried out according to different forms and displacement rules of a reinforcement area, so that the stability of the reinforcement area is effectively improved, the slope angle is increased, the secondary stripping amount is reduced, the stripping ratio of a post-mining area is reduced, and economic benefits are improved; the intercepting ditches and the drainage blind ditches are designed in a matched mode to form a three-dimensional drainage system, and erosion of atmospheric precipitation and underground water seepage to a reinforced area is avoided; the identification area is arranged, so that damage to the reinforcing area during subsequent secondary stripping is avoided; the construction process has similar engineering experience for reference, and the construction difficulty is low; normal dumping and dumping capacity of the strip mine are not affected, the whole process is controllable, accurate implementation is facilitated, tracking monitoring is implemented in the later period of reinforcement, and scheme feasibility is guaranteed.

The application discloses a method, device and equipment for optimizing a stage boundary of an open-pit mine and a storage medium. The method comprises the following steps: obtaining attribute information of nested boundaries of the open-pit mine, wherein each nested boundary is a boundary in a nested structure determined based on economic parameters of mining of the open-pit mine, and the NPV of a boundary located in an inner layer is higher than that of a boundary located in an outer layer; determining a boundary optimization scheme based on the attribute information of each nested boundary and a set boundary optimization model, wherein the boundary optimization model takes the relative balance of ore quantity increment, rock quantity increment and stripping ratio increment in each stage boundary corresponding to stage mining of the open-pit mine as an optimization target; and the boundary optimization scheme comprises a stage boundary selected from the nested boundaries and serving as a basis for stage mining of the open-pit mine. The boundary optimization scheme can be automatically determined, and the economic benefit of the mine is improved.

The application discloses a method for zoned mining of a super-thick inclined coal seam, which comprises the steps of zoned construction, "eight"-shaped internal dumping, external dumping backfilling and longitudinal mining to transverse mining, etc.; the whole open-pit mine realizes longitudinal mining to transverse mining, only the coal seam in the shallow area is mined in the initial construction stage, the stripping ratio is small, the investment can be recovered as soon as possible, the mining of the deep area and the shallow area is combined, and the stripping ratio is balanced; the internal dumping after the mining of the coal seam with a large inclination angle is realized, the external dumping land occupation is greatly reduced, the external dumping land is firstly established and then backfilled, the open-pit mining is completed without the external dumping land, the internal dumping material is not removed twice in the mining process, and the stripping cost is small; the internal dumping land is constructed in a pseudo-inclined mode, safety is ensured, the working lines are arranged staggeredly, the nearest transportation distance from the internal dumping land is kept, and the internal dumping cost is low.