International Journal of Mining and Mineral Engineering
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International Journal of Mining and Mineral Engineering (6 papers in press)
Experimental study on the influence of moisture content on soft coal strength characteristics by Chen Wang, Yuwen Gao, Chenye Guo, Kun Wei Abstract: The strength characteristics of soft coal are influenced by moisture content. The 8# seam is soft in panel II 883-1. The panel II 883-1 is a top slice fully mechanized mining working face. With the increase of moisture content in the experimental range, the following conclusions are obtained: (1) Uniaxial compressive strength and elastic modulus of coal samples decrease gradually; (2) Peak strain and maximum axial strain increase and reach stable at 4% and 5% respectively; (3) When shear angles are respectively 45 Keywords: Moisture content; Strength characteristics; Soft coal; Uniaxial compression; Shear tests with variable angles. DOI: 10.1504/IJMME.2021.10041098
SONAR MAPPING OF ABANDONED WATER-LOGGED UNDERGROUND COAL MINE AND BACKFILLING OPERATION USING UNDERWATER CAMERA by Samir Kumar Pal, Anup Kumar Tripathi, Susmita Panda, Sathish Kumar Palaniappan Abstract: The paper describes mine mapping and backfilling work carried out during field experimentations on simple hydraulic gravity blind backfilling method for the stabilization of ground above old abandoned waterlogged underground coal mine of Eastern Coalfields Limited (ECL), India. The section of the abandoned mine to be backfilled was explored using the underwater remote operated vehicle (ROV) camera before actual backfilling work. The use of sonar imaging facility of the ROV camera for mapping of the underground waterlogged area to be backfilled is described. The plotting of gradual progress of sand bed as the filling progressed in different stages through different boreholes as monitored from surrounding camera boreholes is also described. Keywords: Bord and Pillar mining; surface subsidence; coal pillar deterioration; hydraulic gravity blind backfilling; movable backfilling laboratory; computerized data acquisition; underwater camera; sonar imaging; filled area monitoring; mine mapping.
Investigation of optimum secondary fan location and air quantity to control DPM recirculation in underground dead-end workings by Ramakrishna Morla, Shivakumar Karekal, Ajith Godbole, Mahesh Shriwas, Brian Chapula, Jan Jacobs Abstract: This paper presents a detailed study on optimizing the location of auxiliary fans to control DPM-air recirculation in dead-end workings in which diesel-operated vehicles are used. Parametric studies using computational fluid dynamics (CFD) models validated against field measurements are presented. The study consists of varying the fan locations from the dead-end crosscut and varying the intake air quantities using a 30 m3/s capacity two-stage 75 kW auxiliary fan. The results showed that if the drive intake air flow rate matches the fan capacity (30 m3/s), recirculation will occur even when the fan is located 10 m away from the crosscut entry. Results also showed that if the intake drive quantity was greater than or equal to 150% of fan capacity (? 45 m3/s), no recirculation was observed when the fan location was ? 5 m from the dead-end crosscut access. Keywords: Dead-end; re-circulation; auxiliary fan; cross-cut; DPM; CFD simulation.
Assessment of the economic and socio-environmental potential of small-scale mining of oil sands in Ondo State, Nigeria by Adeyinka O. Omotehinse, Giorgio De Tomi Abstract: Despite the vast abundance of oil sands in Nigeria, a comparative economic assessment is yet to be carried out to evaluate the feasibility of different mining arrangements to exploit it. This research investigates the appropriate approach for the exploitation of the oil sands deposits in order to improve the local economy and to minimize the natural contamination associated to the oil sands. A preliminary economic assessment and sensitivity analysis were carried out on the variables. The results indicate that the mining scenario with synthetic crude oil production is not likely to be feasible because of the significant capital expenditure required and the competition from higher-quality oil reservoirs both onshore and offshore oil. The results show that social license to operate scenario, even with an additional investment of CAD$ 3M, delivers a net present value 11% higher than the scenario without a specific allocation for social license to orientated investments. Keywords: Oil sands; Ondo state; Nigeria; PEA (preliminary economic assessment); Sensitivity analysis; Tar production.
Perception Vis- by Sukanta Chandra Swain, A.S. Babu Abstract: To create feel good factor and strengthen the social bondage between the coal company and the nearby villagers, the coal company in the Korba Coal Fields of Chhatishgarh (India) has been providing multiple facilities to the villagers under the head of corporate social responsibility (CSR). Remarkable facilities offered by the company are related to village infrastructure and health. However, the question that insists for research is pertaining to matching of perception of the the company on benefits appropriated by the villagers with the real benefits that the villagers are getting from CSR activities. Thus, the objective of this paper is to analyze the gap, if any, between the perception and realization pertaining to benefits from CSR activities. ANOVA and Regression techniques are used to analyze primary data collected from 500 villagers and 17 company representatives. It is found that there is no gap between the perception of the coal company on benefits availed by the villagers and benefits appropriated in reality by the Villagers. Keywords: CSR; Coal Company; Korba; Perception; Real Benefits; Chhatishgarh.
The system of monitoring and controlling natural radiation hazards in Polish coal mines by Malgorzata Wysocka, Krystian Skubacz, Boguslaw Michalik, Stanislaw Chalupnik, Jan Skowronek, Michal Bonczyk, Izabela Chmielewska, Krzysztof Samolej Abstract: The problem of radiation hazards related to non-uranium mining was first recognized in the oil and gas industry, while investigations in Poland started in underground coal mines in the early 1970s. It has been revealed that the main sources of natural radiation in Polish coal mines are short-lived radon decay products, radium-bearing formation waters, deposits with enhanced radioactivity, and precipitation out of radium-bearing waters. These deposits are characterized by the remarkably high content of radium isotopes. Therefore, the deposits are intense sources of external gamma radiation as well as internal contamination. The highest observed radium concentration in brines was 400 kBq/m3. In the case of sediments, the highest measured 226Ra concentration was 160 kBq/kg, and 228Ra was 140 kBq/kg. The hazard caused by radon decay products became the issue of investigations later on in the mid-1980s. The radiation monitoring and protection system against all-natural radiation sources of exposure in mines was designed and implemented in the Polish legal system in 1989 and then enforced in all underground mines. The results of more than 25 years of radiation hazard monitoring are presented in this article. Keywords: Enhanced natural radioactivity; radium-bearing waters; radioactive sediments; radiation hazard; exposure assessment.