Nigeria is rich is solid mineral resources, such as: Kaolin, gypsum, mica, clay, tantalite, iron ore, gemstone, silica sand.
Read More
Recycling concrete &building rubble is not only able to bring profit to investors, but also good for environment protection.
Read More
By absorbing the advanced technology from the world, we researched and designed PF series impact crusher.…
Read More
Base on the plentiful experience of producing and marketing of impact crusher, Sofol R&D institution…
Read More
Adopting technology from the world, PY Series spring cone crusher has an excellent performance in secondary…
Read More
The vibrating screen is a kind of sieving equipment of international advanced level, developed by our…
Read More
Sofol VSI Series vertical shaft impact crusher is designed by reputed German expert of Sofol and every…
Read More
The benefits of using geostatistical techniques, over the current interpolation algorithms in use in coal modelling packages used to generate the grid estimates, need to be …
Details
To evaluate the water quantity for each coal mine, the annual normal water inflow date was collected and the mean value was used to measure the average groundwater recharge rate. ... The goaf area and tunnel system of each coal mine was delineated based on the plane plan of the coal mine. Formulas 3 and 4 were used to …
Details
Evaluation methodology. Figure 2 exhibits the procedures and methods of constructing an EEQE evaluation system of the mining area. We select the indicators that can reflect the ecological ...
Details
Introduction. Fossil fuels including fuel oil, natural gas, and coal mostly meet the world's energy needs (Hagen and Robinson Citation 2002).With regards to fossil fuels, coal is the most plentiful energy source, accounting for 40% of global energy (Mathews et al. Citation 2009).Coal provides 77% of South Africa's energy needs, 95% of this energy …
Details
The 1990 Clean Air Act Amendments direct the U.S. Environmental Protection Agency to evaluate and modify, as required, existing dispersion models for the prediction of dispersion of dust from surface coal mines. he application of mathematical air pollution dispersion models to the dispersion of dust from surface coal mines requires …
Details
South Africa is considered as one of the ten largest coal producers and the fourth largest coal exporting country in the world. The above claim perfectly confirms the importance of the coal mining ...
Details
Coal Centre – Coal sampling and analysis standards 4 Abstract Each year, billions of tonnes of coal are traded in regional and international market for use in power generation, steel and cement making, and many other purposes. In …
Details
More than 99% of coal mining in Indonesia is open-pit mining. Nowadays, the adoption of the underground coal mining method is discussed to extend coal production due to the increasing demand for coal.
Details
New Pillar Strength Formula for South African Coal. Journal of the South African Institute of Mining and Metallurgy, vol. 103, no. 5, June 2003. pp. 281-292. [ Links ] 2. VAN DER MERWE, J.N. Predicting Coal Pillar Life in South Africa. Journal of the South African Institute of Mining and Metallurgy, vol. 103, no. 5, June 2003. pp. 293-301 ...
Details
In order to explore the effective evaluation method of environmental pollution treatment effect in China's coal mine subsidence areas, based on the literature review and analysis of current situation, combined with the reality of environmental pollution treatment (EPT) in China's coal mine subsidence areas, this paper selected four categories, …
Details
• Pennsylvania Mine Inspector's Formula—This approach estimates a barrier pillar width based on depth of cover and seam thickness. The formula is: (Eqn. 2) where T is the coal seam thickness (ft) and D is the depth of mining cover or height of hydrostatic head acting against the barrier (rounded up to the nearest 100 ft), whichever is ...
Details
Then, the set-pair analysis method is used to comprehensively evaluate green mine construction in the coal industry, which provides a theoretical basis and practical guidance for further development of green mine construction in the coal industry. ... and the bottom layer evaluation results are calculated separately using the above …
Details
Subsidence data acquisition methods are crucial to mining subsidence research and an essential component of achieving the goal of environmentally friendly coal mining. The origin and history of the existing methods of field monitoring, calculation, and simulation were introduced. It summarized and analyzed the main applications, flaws …
Details
To compare gas and coal life-cycle greenhouse gas (GHG) emissions, decision makers need to account for site-specific inputs. The calculator below guides user inputs to evaluate specific gas and coal resources and operations worldwide and determine their GHG emissions parity*. ... Multiple of IPCC emissions factor for coal mine (CMM) Choose an ...
Details
This study aims at identifying multi-source heavy metal pollution from natural and anthropogenic sources using a regression model, principal component analysis, and five different indices (geo-accumulation index (I geo), the modified degree of contamination, pollution load index (PLI), enrichment factor, and ecological risk factor. Results revealed …
Details
The determination of the optimal slope angle, ensuring the stability of the mining pit is a crucial step during the exploita tion of the deposits because this angle has a double influence: 1 ...
Details
Evaluation grading. Select grade A, B, C, D, E to evaluate the coal mines. Evaluation of final-level indicators. For the final-level subjective evaluation indicators, …
Details
In coal mine safety evaluation, it is about what criteria are used to determine how good or bad each specific safety factor is in the coal mine production system. In …
Details
According to the connotation of ecological environment quality, in order to effectively evaluate the ecological environment quality of environmental pollution governance in the coal mining area, four kinds of evaluation indicators in Table 1 are selected from the perspective of sustainable development. The first type of evaluation …
Details
Coal mines' water inrush is one of the five major disasters that affect the safety of coal mine production. The assessment of coal mines' water inrush is a prerequisite for preventing and controlling coal mines' water inrush. To objectively and effectively evaluate the risk of water inrush in the coal seam roof and overcome the …
Details
Achibo-Sombo mine, located in South Western Ethiopia, is the first underground conventional coal mine in the country with an estimated reserve of about 2.8mt, for active mine area.
Details
Open-pit mining is an important form of coal mining in China, and its damage to the ecological environment is particularly obvious in alpine regions. The ecological restoration of alpine open-pit coal mines faces severe challenges, and its restoration effect will directly affect the ecological security of China. Meanwhile, …
Details
Coal, Coal Resources and Coal Reserves" (the 2003 Guidelines), and were referenced in the 2004 and 2012 editions of ... formula (Preston and Sanders, 1993) which utilises the best estimate of the in situ moisture ... natural or cultural features that preclude mining. For further information refer to section 6.1 and Appendix C (Q1 to 3). Quality
Details
Cost estimation for surface coal mines is a critical practice that affects both profitability and competitiveness. New mines require these costs to be estimated using available information before ...
Details
(a) Results are reported for the surface mining case, with the underground mining numbers being similar. (b) Coal transportation = average user by river. (c) Efficiencies are on a …
Details
P/NAV is the most important mining valuation metric, period. "Net asset value" is the net present value (NPV) or discounted cash flow (DCF) value of all the future cash flowof the mining asset less any debt plus any cash. The model can be forecast to the end of the mine life and …
Details
Exhausted or abandoned underground longwall mining may lead to long-term residual subsidence on surface land, which can cause some problems when the mined-out land is used for construction, land …
Details
The failure and instability process of surrounding rock in deep engineering is accompanied by energy accumulation and dissipation and results in damage and failure, which play an important role in the inoculation and occurrence of rockbursts.The bursting liability, energy transformation, and total damage evolution during the coal failure …
Details
open access. Abstract. In this paper, evaluation index system of coal mine safety is established on the basis of the SMART principles. Weights of indexes are …
Details
The year-after-year deepening of North China-type coal mines has resulted in frequent water inrush disasters at coal seam floors, causing significant casualties and property loss. The key factor for assessing water inrush hazards is the depth at which the coal seam floor will fail. It is therefore of great importance to predict this failure depth so …
Details
Coal mining - Underground, Surface, & Drilling: The various methods of mining a coal seam can be classified under two headings, surface mining and underground mining. Surface and underground coal mining are broad activities that incorporate numerous variations in equipment and methods, and the choice of which method to use in …
Details
Slope instability of open-pit mines has adverse impacts on the overall mine profitability, safety and environment. The slope of an open-pit mine is crucially influenced by the slope geometry, quality of rock …
Details
In the mining process of the II1 coal seam at Zhaogu No. 2 coal mine, a method of stratified mining is employed, leaving relatively wide coal pillars in sections. To enhance the resource recovery ...
Details
US Mineral Exchange can help you calculate your mineral rights value in 2024. Learn how to estimate royalties value with our free calculator.
Details
Globally, mining and combustion of fossil fuels, especially coal, have resulted in various environmental problems. The adverse effects of these industries on human health, agriculture and the ...
Details
The objective of this paper is to evaluate the performance of pillars located on level #3 at Nohyun limestone mine that uses the room-and-pillar method.
Details
1. Introduction. Coal mines are important economic cells that provide coal resources for a country. As a Coal group, it is of some significance to evaluate the comprehensive level of the coal mines under its jurisdiction and promote improvement through evaluation for improving the overall competitiveness of the coal mines and …
Details
1. Introduction. Coal and gas outburst and rock burst, typical dynamic phenomenon that occurs in the process of coal mining, resulted in massive casualties and enormous economic losses (Lu et al., 2020), which severely threatened the lives of miners and delayed the development of coal mine projects (Xue et al., 2020).With aggravated …
Details
Sofol is a well-known crusher and grinding mill manufacturer that offers equipment and solutions for customers from aggregates, mining and mineral grinding industry.
You can leave your message here, we'll send you an Email immediately.
Online ChatCopyright ©2000- 2024 Shanghai Sofol CompanySitemap
PE series jaw crusher is usually used as primary crusher in quarry production lines, mineral ore crushing plants and powder making plants.
GET QUOTE