An extraction method for deep-seated thick seam deposits by underground mining with high resource recovery has remained a great challenge Indian engineers, whereas the longwall top coal caving (LTCC) evolved as an effective various geo conditions in China and other counties. The percentage of (TCR) plays predominant role determining feasibility LTCC, which relies on First Top Coal Caving Distan...

Approximately more than 90% of all coal production in Iranian underground mines is derived directly longwallmining method. Out – of – seam dilution (namely 20–30%) is one of the essential problems in these mines.Therefore the dilution can impose the additional cost of mining and milling. As a result, recognition of the effectiveparameters on the dilution has a remarkable role in ind...

ational statistics on coal-mining productivity show that—except during the 1970s—coal mines have become steadily more efficient. More coal is removed per hour of work, causing a drop in both mining costs and coal prices. However, a new Energy Laboratory study suggests that those national statistics do not tell the whole story. When the researchers analyzed productivity data for more than ninete...

A thin coal seam mined as a protective coal seam above a gas outburst coal seam plays a central role in decreasing the degree of stress placed on a protected seam, thus increasing gas permeability levels and desorption capacities to dramatically eliminate gas outburst risk for the protected seam. However, when multiple layers of coal seams are present, stress-relieved gas from adjacent coal sea...

This paper attempts to predict the surface subsidence induced by multi-seam longwall mining in PT Gerbang Daya Mandiri (GDM) underground coal mine Indonesia. Several numerical models of under various depths were built finite difference code software “FLAC3D” which was used as a tool for simulations. Effect sequence and influence lower seam firstly investigated. The angle draw (AoD) maximum (Sma...

Fault coal bursts is a common type of in mining. With increases mining depths and intensities, the occurrence frequency disaster degree fault-controlled areas are increasing severity. Therefore, this article, mechanism control method deep mining-induced fault analysed on No. 3402 longwall panel controlled by two faults Shandong Mine, China. Based microseismic monitoring data panel, activation p...

To understand the change in overburden structure after coal seam group mining, we investigated characteristics and bearing capacity of abandoned mines a group. We provide theoretical basis for construction utilization mining subsidence area under complex geological environment. This paper takes project Zhongtie Huizhi Square Zhangqiu District, Jinan City, Shandong Province as engineering backgr...

Abstract In the process of longwall top coal caving, selection caving interval along advancing direction working face has an important effect on recovery. To explore a realistic face, panel 8202 in Tongxin Coal Mine is used as example, and 30 numerical simulation models are established by using Continuum-based Distinct Element Method software to study recovery with 4.0 m, 8.0 12.0 16.0 20.0 m 2...

During the last three decades, a significant amount of research has been directed to developing predictive tools for assessing stability Castlegate Sandstone escarpment, travel distances debris and need any control measures in Central Utah. The cliff-forming is 60 m thick at study mine Utah lies approximately 250 above multiple-seam coal reserves. To assess escarpment stability, authors used mu...