According to the relevant empirical parameters from modern mining manual (Wang 2012), such as the sublevel rock drilling level stope method and the sublevel caving method without pillar, the basic elements of the stope for the new combined mining method are determined. These include a level height of 50–60m, a stope length …
قرأ أكثر
Although sublevel caving is a method that allows plenty of scope, flexibility and relatively high ore yield, its complexity increases as the mining depth increases. ... One of several possible routes is the establishment of more energy-bearing pillars in the mining areas, similar to the pillar that was established in Block 22 and has ...
قرأ أكثر
Since the 1970s, the sublevel stoping mining method (Fig. 1) has been an open stope mining method with relatively advanced technology, high mechanization and efficiency, reasonable safety, and low loss for the application of trackless excavating equipment in the underground.Its main features include: (1) The stage height is 40–60 m …
قرأ أكثر
To mine out such lost ores from the broken waste rocks and increase ore recovery in SLC mines, a new mining method called lost-ore mining is introduced as a …
قرأ أكثر
Inf. Circ. 6350.—Undercut Block-Caving Method of Mining in Western Copper Mines, by E. D. Gardner. 1930. 44 pp. ... Sublevel stoping. 2. Open stopes with pillar supports. (a) Casual pillars. (b) …
قرأ أكثر
Non-pillar sublevel caving is a widely used mining method which is based on the utilization of gravity to generate a flow of blasted ore and caved rock waste (Brady and Brown 2006; Villegas et al. 2011; Svartsjaern et al. 2016; Svartsjaern 2019; Xia et al. 2019). That is, the ore is fragmented by detonating blasts in holes drilled upwards in ...
قرأ أكثر
Caving Methods of Mining. There are three distinctive methods of working large deposits that involve, in some way, the factor of caving. ... Sublevel Caving. This method, otherwise referred to as …
قرأ أكثر
instability brought to the fault by the sublevel caving method without the sill pillar is greater than that brought to the fault by the lower layer filling method under the premise of only changing the height of the sublevel. Keywords: coordinated mining; fault dynamic response; lower -layer filling method; mining impact; sublevel caving ...
قرأ أكثر
Here extraction ratio R e is defined as (1) R e = W e W p where W e is the total weight of extracted materials including ore and waste rock and W p is total weight of materials planned to mine out from a ring (or an ore body or a mine). Table 1 shows that the number of last rings using lost-ore mining method from different production levels of …
قرأ أكثر
The second caving method, Sublevel Caving, is an underground mining method proposed for moderate and strong strength of ore, weak rock strength, tabular/massive deposit shape, steep deposit dip, large thick deposit size, moderate ore grade, moderate in uniformity grade, and moderate depth [9].
قرأ أكثر
Non-pillar sublevel caving is beginning to use large structural parameters in China. Appropriate structural parameters can effectively control the loss and dilution of stope and improve ore ...
قرأ أكثر
This study optimized the sublevel height, production drift spacing, and drawing space for sublevel caving without a sill pillar in Chengchao Iron Mine. The optimal parameters …
قرأ أكثر
Among underground mining methods, block caving, sublevel caving, sublevel stopping, cut and fill, and stope and pillar methods are usable for the mining of metallic reserves. The true optimum solution is guaranteed for the pit limit optimization and several computer packages are available to the industry.
قرأ أكثر
For example, the sublevel caving method without the sill pillar and the lower-layer filling method of coordinated mining can be used to analyze the dynamic response law of the fault, as well as ...
قرأ أكثر
The non-pillar sublevel caving method with large structural parameters used in Mao Gong Iron Mine is of high rate of dilution and loss, and the ore recovery rat ... this paper analyzes the influence mechanism of the caving step on the mining index by means of the matching relationship between the shape of caved ore body and the drawn …
قرأ أكثر
After the stope structure parameters, hole arrangement parameters, blasthole layout form, initiating mode and ore drawing mode of sublevel caving without sill pillar in Shenbu Copper Mine had been improved, ore loss and dilution ratio, unit consumption of explosive were reduced, production ability was increased, and good technico economical indexes …
قرأ أكثر
Sublevel Caving Sublevel caving is usually carried out when mining of the orebody through an open pit method is no longer economically feasible. Mining now proceeds underground, underneath the open pit. At first, both a raise and a network of tunnels are made. At different sublevels, jumbos are used for long hole drilling,
قرأ أكثر
As a mining method with high mechanization, high safety and low operation cost, sublevel caving without sill pillar uses drift to cut ore body, and then uses mediu …
قرأ أكثر
X. Dong, H. W. Deng, Stope parameter optimization of sublevel caving without sill pillar in Xiadian gold mine. Mining technology, 2019.9 (3): 4-6. Recommended publications
قرأ أكثر
Int. J, Rock Mech. Min. Sci. Vol. 3, pp. 129-153. Pergamon Press Ltd. 1966. Printed in Great Britain SUBLEVEL CAVING* I. JANELID and R. KvhPm Department of Mining and Mine Surveying, Royal Institute of Technology, Stockholm, Sweden (Received 1 November 1965) A~traet--The following article contains a summary of the results obtained by …
قرأ أكثر
Other articles where sublevel caving is discussed: mining: Sublevel caving: This method owes the first part of its name to the fact that work is carried out on many intermediate levels (that is, sublevels) between the main levels. The second half of the name derives from the caving of the hanging wall and…
قرأ أكثر
Learn about the design and operating principles of sublevel caving (SLC), a mining method for low grade near-vertical deposits. See examples, diagrams, and videos of …
قرأ أكثر
For example, the sublevel caving method without the sill pillar and the lower-layer filling method of coordinated mining can be used to analyze the dynamic …
قرأ أكثر
The study on structural parameters of sublevel caving method without sill pillar applied in Jinshandian Iron Mine is made by ore-drawing test in laboratory,which adopted multi-segment three-dimensional ore-drawing model to determine 9 sets different structural parameters for the mining method by orthogonal test,in result,datum from the test are …
قرأ أكثر
Sublevel shrinkage (SLSh) is an underground mining method similar to sublevel caving (SLC) but with continuous backfilling from the top. It features a top-down mining sequence with production drifts orientated in a longitudinal or transverse way in the orebody. Fan drilling and blasting is done from the production drifts, from where the ore …
قرأ أكثر
Sublevel caving (SLC) is a mass mining method based upon the utilisation of gravity flow of blasted ore and caved waste rock [1]. The method functions on the …
قرأ أكثر
1.. IntroductionSublevel caving (SLC) is a mass mining method based upon the utilisation of gravity flow of blasted ore and caved waste rock [1].The method functions on the principle that ore is fragmented by blasting, while the overlying host rock fractures and caves under the action of mine-induced stresses and gravity [2].The caved waste …
قرأ أكثر
without recovery or Pillars. Prof. Dr. H.Z. Harraz Presentation ... -in sublevels production when using sublevel caving-; ... Choice of mining method; What determines the type of mining? Types of ...
قرأ أكثر
After mining, the vertical displacement of the fault surface at the filling method was about 0.6 m, and the maximum vertical displacement of the fault plane on the mining side could be up to 1.2977 m when the sublevel height of the sublevel caving method without the sill pillar was 10 m; the maximum vertical displacement of the fault …
قرأ أكثر
Sublevel Caving Method Without Sill Pillar. It is the mining process in which a level is divided into several sublevels and the stopping of ore is performed by sublevel caving from top to bottom. The lower part of a sublevel does not have the bottom …
قرأ أكثر
The sublevel caving method without sill pillar is primarily inclined to increase the structural parameters of the stope. Increasing the structural parameters of stope will …
قرأ أكثر
Surface subsidence is a geological hazard resulting from sublevel caving (Chen et al. 2016). Sublevel caving is a mass mining method based on utilizing the gravity flow of the blasted ore and caved waste rock. Sublevel caving without sill pillars is the main mining method used in underground metal mines in China (Li et al. 2006). …
قرأ أكثر
that of sublevel caving method with sill pillar and external force of drilling blasting is required for caving. The method belongs to one-step min-ing, which is characterized by caving at one time in the whole stage height without sublevels. This mining method is divided into two mining schemes: stage forced caving with compensation
قرأ أكثر
The underground mining methods we use include room and pillar, narrow vein stoping and large-scale mechanised mining. ... sub-level-caving, where levels of the ore are blasted by explosives; and ; block caving, where large areas of the ore body are blasted and then extracted with the assistance of gravity. We use these three different types of ...
قرأ أكثر
Broken rock mass and unreasonable stope structure parameters can cause excessive ore loss and dilution in sublevel caving; this is the main problem faced by caving mining in recent years. This paper proposes a stope structure parameter optimization method suitable for steeply inclined medium-thick broken ore bodies and evaluates the reliability …
قرأ أكثر