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As the inclination of the ore body increases, the force of the overlying rock layer parallel to the direction of the ore layer increases, while the force perpendicular to the direction of the ore layer decreases. After the mining of the ore body in the same spatial range, the amount of roof subsidence gradually decreases.
breasting mining method (Fig. 1) and the full shrinkage stopping mining method. The general breasting mining method gener-ally divides the section into the regular ore blocks along the orientation of ore body, and stopes the ore blocks along their orientation and inclined direction. According to the change of ore body thickness,theshort ...
The gently inclined thin to medium thickness ore body under a weak rock stratum is one of the typical difficult bodies to mine. In order to solve the fuzziness, randomness, and uncertainty in the process of mining method optimization for such ore bodies, a multi-level, …
UN – EOLSS SAMPLE CHAPTERS CIVIL ENGINEERING – Vol. II - Underground Mining Methods and Equipment - S. Okubo and J. Yamatomi ©Encyclopedia of Life Support Systems (EOLSS) 2. Strength of the hanging wall, footwall, and ore body. 3. Economic value of the ore and grade distribution within the deposit.
Using this lost ore mining method, the Malmberget mine had recovered 7.5 million tons of lost iron ores from many old production drifts, as reported in the year 2016.
On the basis of all characteristics of coal seam the seam-II is the most vital, because it contains lion's share of coal reserves about 73.68 million ton (about 55.67% of total reserve), good ...
Geotechnical analysis plays an important role in determining mining method selection. This study presents the geotechnical design analysis of a potential U/G iron ore Mentes Mine at Yahyali province of Kayseri district in Turkey. Iron ore body is initially planned to be mined by using long hole mining method.
The stage height is 40 m, the sublevel height is 20 m, and the caving step is 1.6 m. The mining roadways are arranged along the vein, and the mining route is close to the footwall of the ore body. The ore recovery rate is 82.01%, and the dilution rate is 17.89%. The stope structure is shown in Fig. 16.
35. 35 13. In-Situ Leach (ISL) Mining: Some ore bodies, due to ore concentration or the surrounding material, can only be accessed by dissolving the ore body using water soluble acids or alkalis and then pumping out the solution. The ore body is then recovered as a precipitate. This method is common when extracting minerals near aquifers. It is also used if …
It was applied to the mining method optimization process of Miao-ling gold mine in China in order to provide a reference for the safe and efficient mining of gently inclined and soft broken ...
The breasting mining method is suitable to the stope horizontal and gently pitching orebodies with an inclination angle of no more than 30°, the thin and medium-thick ore bodies with a thickness of less than 3 m, the medium-stable ores and roof rocks that can ensure the safety of workers operating directly under the exposed roof, and the lean ...
as an example, the AHP-TOPSIS comprehensive decision model of mining method optimization is established, the comprehensive superiority degrees of the four mining schemes are 67.57%, 45.07%, 56.07%, and 31.63%, and the upward horizontal drift backfill mining method is determined as the optimal scheme.
The bench slope is about 45 to 72 degrees. Systematic blasting is necessary to mine this ore body. 14. ... of safety and stability to the nearby structures and also for all the people working around the mines. ... the excessive burden on the left. This is an inclined blast hole. But has an excessive inclination. Not a good method.
The raise boring method is used therefore. Depending on ore body shape, rock mass conditions, and mining directions, slot raises can be situated in the ore body or in the contact areas of the ore body with surrounding rock mass formations. Raises can either be vertical or inclined.
At the same time, the range of the overburden of the stope affected by mining gradually decreases with increasing the inclination of the phosphate ore body. The inclination of the …
A more popular way to categorise mining methods is to divide the mining methods into bulk mining (Blasthole, etc.) and selective mining (Drift and Fill, etc.). Rules of Thumb Method Selection A flatly dipping ore body may be mined using Blasthole when the height of ore exceeds 100 feet (30m); otherwise, it is mined Room and Pillar.
Large production rates around 10 kt- 30 kt per day or 3Mt - 10 Mt per annum of ore. ... Mining methods which allow early production start-up and build up to maximum desired production rates are therefore desirable, provided other financial, operating and safety criteria are met. ... massive caving of the ore body, the overlying waste rock, or ...
Applications: • Ore bodies with horizontal or flat dip, inclination not exceeding 30⁰. • Competent rock in the hanging wall and ore. Types: ... Sublevel stoping mining method: • The ore body is divided vertically by driving crosscuts and haulage levels every 150 to 400ft (45 to 120m).
Geotechnical Considerations for Mining Method ... Mentes district part of the ore body has relatively mild dip with around 20° inclination. It is observed that the ore bearing rocks are a ...
Different mining methods are designed to produce different types and magnitudes of displacements, in the near-field and far-field domains of an orebody. For example, the …
Long-term field monitoring finds that serious surface subsidence can still occur even if the high strength cemented fill method is adopted. Combining the results of numerical …
2. Rock Mass JHC Damage Model Based on Lsdyna Simulation 2.1. Rock Mechanical Parameters and Rock Mass Structure. This gold mine has exposed ore body at −1005 m level, which is mainly potassic granite, serpentinized granite, and locally black mica granite [].The rock Mohs' hardness coefficient is 10∼12; accurate mechanical properties of the rock mass are the …
the time periods of quarry exploitation. Ore mining is performed alternately in one of the sections. Mining operations begin in primary section I. During the first mining period T 1, the ore reserves of the first stage in this section are fully worked out by quarry. In the next period T 2, the ore reserves of the first stage of
In order to smooth ore production during the transition from open pit to underground mining at Yanqianshan Iron Mine, China, it is necessary to select an appropriate mining method to operate simultaneously open-pit mining and underground mining for inner-slope (hanging-wall) ore-body. Based on practical geologic setting of the hanging-wall ore …
mining: bord and pillar systems, room and pillar mining, longwall mining, thick seam mining methods; Underground metal mining : open, supported and caved stoping methods, stope mechanization, ore handling systems, mine filling. Generation and transmission of mechanical, hydraulic and pneumatic power; Materials
The inclination angle of this type of ore body is mostly 5~30 •, which is not conducive to the normal operation of trackless mining equipment such as intelligent scrapers, nor to ore-drawing ...
The invention discloses an inclination fragmentation ore body segment top board reconstruction middle-deep hole ore break down filling mining method. According to the method, an intermediate section on an ore body direction is divided into several backstopping units; an intermediate section transport tunnel is arranged at the bottom of the intermediate section, a …
3. INTRODUCTION In India, about 98% of underground output of coal is obtained by Bord and Pillar method and barely about 2% by longwall methods. The other countries where Bord and Pillar method predominates are Australia, The USA and South Africa. The key to the successful Bord and Pillar mining is selecting the optimum pillar size.
It was applied to the mining method optimization process of Miao-ling gold mine in China in order to provide a reference for the safe and efficient mining of gently inclined and soft …
The paper proposes a safe, high-efficiency and low-cost mining technology suitable for steeply inclined thin ore bodies-segmented empty field subsequent filling mining method combined with 3Dmine ...