著者

古川 博文 松井 紀久男 島田 英樹

出版者

一般社団法人 資源・素材学会

雑誌

資源と素材 (ISSN:09161740)

巻号頁・発行日

vol.121, no.9, pp.446-455, 2005 (Released:2007-02-24)

参考文献数

6

被引用文献数

1 3

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India is the third largest coal producer in the world and has substantial coal reserves. It produced about 340 million tons of coal in 2002-2003. Open cast production accounts for 80% of the total output and the remaining 20% is from underground. The share of the underground output in the total production is expected to remain at the current level through 2010 even as the coal production increases. Despite its huge resource of coal, the quality of Indian coal is not so good. A considerable amount of good quality coal deposits in India lies in the thickness range of 5-12 m. However, an appropriate mining method for such thick seams could not be developed so far.The coal's share of total electric power generation in India is 75.5% in 2001. Because it is a reliable, domestic, and low-cost source of fuel, coal has played and will continue to play a significant role in the development of the Indian economy. Production, processing, and consumption of coal, however, can have significant environmental impacts, if not properly managed.The paper describes the present situation of the Indian coal mining industry, discusses problems in thick seam mining methods, and proposes a new mining method for thick seams considering today's environmental issues in Indian coal mining.

著者

古賀 誠 島田 英樹 松井 紀久男

出版者

The Mining and Materials Processing Institute of Japan

雑誌

資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan (ISSN:09161740)

巻号頁・発行日

vol.118, no.1, pp.29-35, 2002-01-25

被引用文献数

4 7

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A bleeding examination and a flow characteristic examination of grout materials were performed to understand the fundamental characteristic of grout materials. Moreover, an injection experiment of grout materials which used a decomposed granite was conducted to understand the applicability of the analysis technique which introduced filtration theory. The results are as follows:<BR>1) When cement water ratio is large, a bleeding speed becomes slow, but the bleeding ratio becomes small.<BR>2) Plastic viscosity and yield stress become large with increase of cement water ratio. Particularly, plastic viscosity change greatly on <i>C</i> / <i>W</i> = 1 / 1.6. And as compared with yield stress, it is larger about influence on the discharge.<BR>3) Where a cement water ratio does not exceed <i>C</i> / <i>W</i> = 1 / 5, the clogging of the voids was done by a suspension custody. And where <i>C</i> / <i>W</i> = 1 / 3.5, that was done by a surface filter layer.<BR>4) The plastic viscosity measured using Brookfield viscometer is a result when some cement particles aggregate, and shows big value as compared with the theoretical relative viscosity.<BR>5) The result of injection analysis using the theoretical relative viscosity assumed that the cement particle is distributing completely is well as an experiment result in agreement. In the grout materials which flow the inside of the voids, it cleared that plastic viscosity follows the theoretical relative viscosity which the cement particles distributed.

著者

植田 武 松井 紀久男 島田 英樹

出版者

一般社団法人 資源・素材学会

雑誌

資源と素材 (ISSN:09161740)

巻号頁・発行日

vol.121, no.9, pp.438-445, 2005 (Released:2007-02-24)

参考文献数

9

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Increased opposition from environmental groups is severely restricting the operation and planning of large-scale surface mines in the world. Some projects of surface mining will have to be cancelled and downsized due to environmental issues. Under this social situation, the mining industry has started the campaign and the public relations for the importance of extracting and using coal resources in order to mitigate the protection. It has been recognized throughout the industry that planning is essential to minimize the effects of mining on the environment. Environmental management and rehabilitation are now integral parts of planning for mining.Mines have a finite life that ceases when the mineral has been fully extracted. During the life of mine, mining, especially surface mining, has the potential to have environmental effects that extend beyond the confines of the mine boundary. These include erosion with increases in sedimentation and turbidity in surrounding water courses and leaching of salts that also result in the reduction of water quality. These effects may range from minimal to quite severe and widespread, depending upon the physical and chemical properties of the overburden and reject materials, the climate and location of the mine, and its relationships with surrounding land uses. Rehabilitation of mines is aimed towards the projected future land-use of the area.This paper describes surface mining systems in Australia and then discusses the factors that should be considered in order to avoid potential environmental issues resulting from surface mining when developing a new surface mine.