1. Mine fire due to improper stowing in underground mines
Utilization of OB Dump Material for Backfilling in Underground Mine Voids : A Sustainable Waste Management Approach Anup Kumar Gupta, Biswajit Paul Department of Environmental Science & Engineering, Indian School of . Mines, Dhanbad ,
Contd.
INTRODUCTION
Backfilling is a mandatory and integral part of mining.
Mine fire due to improper stowing in underground mines
Underground mining has some advantages over opencast mining thus frequently used from last few decades.
River sand is widely used material for underground mine backfilling due to its availability in adequate amount but now it’s going to be scarce resource thus mines are probably left without backfilling.
These may cause different environmental problems as land subsidence, mine fire, reduction in production etc.
Thus there is a need of an alternative of sand that is easily available and cost effective. Coal mine overburden might be used as for the same. It needs some physical and geotechnical analysis that confirms its suitability as stowing material
STUDY AREA
Backfilling is one of the most important parts of underground mining. At present river sand is widely used material for stowing but as the demand increases there is pressure on mining industry to search an alternative of sand because sand resources are limited and there are possible negative impacts on river ecosystem and nearby land system with their exploitation. Different materials have been analyzed to check the suitability of backfilling as Fly ash, Mine tailings and Overburden dump. Overburden dump which is generated in a huge mass during opencast mining which is shelf causing different environmental problems (land pollution, air and water pollution), might be good alternative of sand .
Land subsidence due to infilling of underground mine
Air Pollution Due to Burning of Oxides of Carbon and Sulfur from overburden dump
DISCUSSION
OBJECTIVE
To provide an alternative of river sand as stowing material.
METHODOLOGY
Identification and collection of overburden dump material
Geotechnical and Physical investigation
Comparative analysis of river sand and overburden
Preparation of sand like material from overburden material
Analysis for rheological properties to check the flow-ability parameters
To design an techno-economic system for slurry flow
Experimental analysis to be done-
Physical analysis viz. Specific Gravity analysis, Bulk density, Porosity and Grain Size distribution
Geotechnical analysis viz. Triaxial test, Compaction test, Consolidation test, Water percolation characteristics, Settlement characteristics, Compressibility
characteristics
REFERENCES
Barapanda P., Singh S. K. and Pal, B.K., (2001). Utilization of coal mining wastes: An Overview, National Seminar on Environmental Issues and Waste Management in Mining and Allied Industries, Regional Engg. College, Rourkela, Orissa, India.
Bradshaw A.D. and Chadwick, M.J., (1980). The restoration of land. Blackwell Scientific Publications, Oxford
Bhati, N.P and Gaidhani, S.B , “Removal of clayey Materials from Overburden of Opencast Mines”, Minetech, Vol. 17, No. 2&3,pp 83-87, March-June.
Chaulya S. K., Singh R.S., Chakraborty M. K. and Tewary B.K., (2000). Bioreclamation of coal mine overburden dumps In India. Land Contamination Reclamation., 8(3), pp.
PROBLEMS DUE TO OVERBURDEN DUMP
Water Pollution Due to Leaching
Mineral component of the OB is leaching to the ground water and cause contamination