Run-of-mine coal 23toOcm c=lataree I5 to5 cni ( the uppa lit not Weeding23cm) coal, small 5toocm ... of samples are expected to be adequate for the determination of other characteristics also. 0.6 Thii standard as originally issued had also included the sampling ... methods for sampling of coal as Part I of this standard. P&t II, -dealing

In this study, groundwater, stream water, and stream sediment samples were collected from a coal mine area in Dazhu, Southwestern China, and hydrogeochemical, multivariate, and X-ray analyses were …

A Simple Method for Measuring Basic Parameters of the Coal—Methane System under Mining Conditions N. Skoczylas, M. Wierzbicki & M. Kudasik Journal of …

The final allowable mining elevation is − 20 m. The mining levels are + 26 m, + 10 m, − 5 m, and − 20 m, and the height difference is 15 m. At present, the east and west mining areas have been mined to − 5 m. The − 20 m platform section is being used to coal mining. After years of mining, a huge precipitation funnel has been formed.

During mining, processing and utilization of coal, the environment is exposed to piles of coal, coal gangue and coal ash, which have human health concerns. Coal and coal gangue samples were obtained from a coal mining company located in Southern Province, Sinazongwe District, Zambia. The main objective of this research …

The molecular structure of coal refers to the order and way in which different atoms in the molecule are connected to each other, and its structure determines the …

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 …

Coal mining: draft method determination (PDF - 687.37 KB) | (DOCX - 312.66 KB) Coal mining explanatory document (PDF - 688.02 KB) | (DOCX - 105.9 KB) Note: A draft method determination that is open for public comment should not be relied upon for planning an ERF project. Draft method determinations may be modified …

Coal mining may lead to ground subsidence in a long term and is widely distributed, which can cause environmental damage and other disasters. ... An indicative method for determination of the most ...

Past studies have not assessed mine tailings management strategies. Therefore, this paper aims to estimate the financial value of six different tailings disposal methods in coal mining. A comparison of cost analysis is presented to determine the most preferable option in terms of cost, benefit, and environmental impact.

By employing data statistical methods, the structural importance analysis method of fault tree analysis, and the summation method, the risk associated with each working position was evaluated. Then, this work built a risk assessment matrix to categorize risk levels associated with various working positions related to gas explosions in coal …

1. Introduction. Coal mine gas disaster is always the most dangerous in the process of coal mining [1].The determination of coal seam gas content is one of the fundamental key works involving the regional prediction of coal and gas outburst, validity check of outburst prevention, prediction of coal mine gas emission and designing gas …

1. Introduction. Gas content can be generically defined as the volume of gas contained in unit mass of coal. Gas content of coal is required for a number of purposes: to assess the gassiness of coal for safe mining in outburst and high gas emission conditions, to estimate gas reserves for coal seam gas (CSG) production projects but …

To determine a reasonable waterproof coal pillar width for the mining of a shallow coal seam located close to gob, we adopted the method of theoretical analysis. The saturation line was deduced by simplifying the saturation line of the gob into an upper wedge section and a main seepage section.

Coal mining industries is one that generates the coal for the market by two different ways namely, opencast and underground. Almost 85% of Indian coal mines are operates by the opencast method and ...

Hard coal — Determination of moisture in the analysis sample — Direct volumetric method. 95.99: ISO/TC 27/SC 5: ISO 349:1975. Hard coal — Audibert-Arnu dilatometer test. 95.99: ... Coal — Methods for evaluating flocculants for use in coal preparation — Part 2: Flocculants as filter aids in rotary vacuum filtration systems. 90.93:

The safety evaluation indexes and of n coal mines are compared in pairs, and are obtained by a quantitative description of the affiliation degree of fuzzy relationship using a 0.1∼0.9 scale. The fuzzy judgment matrix of the coal mine safety evaluation index is constructed, in which and are satisfied. 3.1.2. Fuzzy Consistent Judgment Matrix.

Houjun's study on the coal mine flood obtain that there are 35 basic events in minimum set that can prevent the coal mine flood from occurring, and put forward the best approach to eliminate coal mine flood according to the results of the analysis [5]. Xu Jiangtao combined the fault tree analysis method and qualitative

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 extracting a coal seam depends on many technological, …

Coal mine accidents are mainly caused by the unsafe behavior of workers. Studying workers' unsafe behaviors can help in regulating such behaviors and reducing the incidence of accidents. However, there is a dearth of systematic literature review in this area, which has hindered mine managers from fully understanding the unsafe behavior of …

(NIOSH) are Method 7603 (crystalline silica in coal mine dust by IR) and Method 7500 (crystalline silica by XRD) [9]. For determination of the silica content of respirable coal mine dust samples, the Mine Safety and Health Administration (MSHA) employs the MSHA P7 Infrared Method, hereafter referred to as P7 [10,11].

In this study, the Mong Duong underground coal mine in Vietnam was selected to collect and analyze coal samples. It is located within 106° 36′ 23″ E–106° 36′ 47″ E and 21° 04′ 10″ N–21° 04′ 30″ N in a province of Northern Vietnam (Fig. 1).From a geological perspective, the study site has a complex geological structure that contains …

The mining method selected for exploitation is determined mainly by the characteristics of the coal deposit and the limits imposed …

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 ...

The direct method to determine the gas content of coal seam is to drill the coal seam, remove the original coal drill cuttings sample, determine the gas desorption …

According to the elastic-plastic analysis method of the CSP, the width of the residual coal pillars on both sides should be at least where is the reserved coal pillar width, is the average mining thickness of the coal seam, is the safety factor, taking 1.5, is the internal friction angle of the coal seam interface, and are the stress ...

Especially in the determination of some deformed coal, the error between the two methods will be greater. Based on the dynamic gas diffusion model, this paper …

In situ fluidization mining is a promising method which shows considerable potential for reducing the ecological influence impacts of coal mining. During fluidization mining, coal gangue will be separated from the ores, filled back, and returned to the excavation region, which, depending on the filling rate, greatly reduces the stratum …

D8213-18 Standard Test Method for Determination of Boron in Coal . D5016-16 Standard Test Method for Total Sulfur in Coal and Coke Combustion Residues Using a High-Temperature Tube Furnace Combustion Method with Infrared Absorption . ... D4596-22 Standard Practice for Collection of Channel Samples of Coal in a Mine .

Membership determination of evaluated coal mine. For the evaluated coal mine, apply the weighted average fuzzy operator to determine its membership vector U according to the first-level indicators. The determination method is the same as that of non-final-level indicators. Grade determination of each indicator and the evaluated coal …