Typical Coal Mine Research Articles

Some factors to consider when selecting mining equipment for a typical opencast coal mine in the Witbank area : Fourie, G A Proc International Conference of the South African Institute of Mining and Metallurgy: Planning and Operation of Open-pit and Strip Mines, Pretoria, 9–13 April 1984P351–361. Publ Johannesburg: South African Institute of Mining and Metallurgy, 1986

Some factors to consider when selecting mining equipment for a typical opencast coal mine in the Witbank area : Fourie, G A Proc International Conference of the South African Institute of Mining and Metallurgy: Planning and Operation of Open-pit and Strip Mines, Pretoria, 9–13 April 1984P351–361. Publ Johannesburg: South African Institute of Mining and Metallurgy, 1986

The optimization of coal mine production schedules using linear programming: An example that determines the effects of reclamation costs and interest rates

Reclamation expenditure on coal mine properties is now a fundamental business expense for that industry. A mine owner or manager will attempt to keep this expense to a minimum subject to a given level of production. One of the most important variables that can be manipulated to help keep costs down is the production schedule. Production schedules can be shifted forward or backward depending on the current economic situation. A common method of determining optimal production schedules is to utilize a linear-programming model. These models simultaneously take into account all the variables associated with a project so that an optimal production schedule can be derived. This study involves work with a computerized linear-programming model to examine how optimal production schedules will change for a typical small coal mine due to reclamation requirements and a variable discount rate. The purpose of this paper is: (1) to demonstrate how linear programming can be used to incorporate nonlinear relationships in a profit maximization problem involving mining; (2) to show how, through the use of a heuristic model involving reclamation cost requirements, linear programming can contribute worthwhile information to the mine planner; and (3) to examine how interest rates can (a) be used to estimate future uncertainty, and (b) be used as a policy tool to promote conservation.

炭鉱別石炭試料の温度上昇に伴つて発生する微量ガス成分と臭気

炭鉱別石炭試料の温度上昇に伴つて発生する微量ガス成分と臭気

3D mine pillar design information from 2D FEM analysis

AbstractThis paper described a technique for obtaining three‐dimensional mine design information using a two‐dimensional finite element program where the mining geometry consists of an extensive array of underground rooms and pillars. The technique is based upon a simple augmentation of forces in a two‐dimensional analysis to produce the same average pillar stress that would occur in a full three dimensional analysis. Detailed comparisons between a three‐dimensional analysis, a two‐dimensional analysis (plane stress and plane strain) and an augmented two‐dimensional analysis (also plane stress and plane strain) of stress about a typical coal mine pillar are presented. A local factor of safety is defined and then mapped over the pillar midplane, the immediate roof and immediate floor using the results from the full three‐dimensional analysis. Comparisons of roof and pillar safety factor distributions obtained by the three‐dimensional, two‐dimensional and augmented two‐dimensional analyses show that the minimum safety factors in the pillar (at the pillar sides) are predicted quite closely by the augmented two‐dimensional techniqe (plane stress). The same is true of the immediate roof, although the three‐dimensional safety factor tends to be higher in the roof (over the room) than that calculated by the augmented twodimensional technique. The augmented loading procedure appears to hold considerable promise as a very efficient and cost reducing techniqe for mine pillar design.