Geoenvironmental studies for impact assessment and management plan for opencast coal mining project at Sonepur-Bazari of Eastern Coalfields Limited, Bardhaman District, West Bengal

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Authors:Sengupta, Subhransu; Sarkar, Sutanu; Ghosh, Gautam; Chakravarty, P.
Author Affiliations:Primary:
Geological Survey of India, Calcutta, India
Volume Title:Proceedings; symposium on Earth sciences in environmental assessment and management
Volume Authors:Dungrakoti, B. D., editor; Jangi, B. L.
Source:Special Publication Series - Geological Survey of India, 48(2), p.211-218; Symposium on Earth sciences in environmental assessment and management, Lucknow, India, April 9-11, 1996, edited by B. D. Dungrakoti and B. L. Jangi. Publisher: Geological Survey of India, Calcutta, India. ISSN: 0254-0436
Publication Date:1997
Note:In English. 3 refs.; 3 tables, sketch map
Summary:Geoenvironmental studies in the core area and buffer zone around 10 km radius around Sonepur-Bazari project has been conducted to assess the impact of opencast mining on geoenvironment and evolve suitable plan for management. Sonepur-Bazari block has a total quarriable area of 920 ha with a maximum projected quarrying depth of 270 metres. The average stripping ratio is 5.13 m3/tonne for 25 years life to achieve a production target of 3 million tonnes annually. The area constitutes a part of Ajay-Damodar interfluve with 60% of area lying in Ajay basin. Morphologically the area forms a pediplain on Gondwana sedimentaries having slope ranging between 0° and 10°. Coal seams occur within Raniganj Formation at various depths. At present seams at 42 to 64 cm depth (R-IV top and R-V) are being worked out. Opencast activities in Sonepur-Bazari area has resulted into extensive land scarification and development of the anthropogenic landforms which include mine pits, quarries and spoil dumps. The dimension of the quarries varies from 200-400 m in length, 80-150 m in breadth and 50-70 m in depth. The variation in dimension of overburden soil dumps ranges between 100-300 m in length, 50-100 m in breadth and 10-30 m in height. Location of waste dumps on valley top areas near Bazari village has resulted in easy removal of loose sediments into the valley bottom causing contamination of soil and surface water and also drainage congestion. The quarrying has resulted into depletion of a number of surface water bodies in Sonepur, Bazari, Panjabidanga villages. The results of chemical analysis of surface water bodies including mine pits indicate that all values are within the tolerance limit as per IS 2490 (Part-I, 1974). In spite of mining and attendant dewatering no conspicuous change in depth to water level (3 to 10 m bgl) has been observed. Toxic elements are well below tolerance limit. Soil in this area is also not contaminated. Out of 1,205 ha to be affected as a result of mining, 33% will be agricultural land, 50% lateritic upland and the rest includes tanks, quarry debris, road, etc. A few villages and Haripur-Pandaveswar road will be affected by these activities. In the buffer zone, land subsidence has been observed in the east of Shyamsundarpur colliery and within Jambad opencast project (OCP). The subsidence cracks are circular in nature and extend up to a depth of 10 m bgl. Emanations of pungent smelling gas and incidences of mine-fire have been noted within Jambad OCP, Kenda and Kumarkhola pits. The plan for managing the geoenvironment involves: (i) identifying better spot on valley top for siting waste dumps, (ii) sort the waste material, while dumping, in such a way so as to restore the soil during reclamation of the quarry, (iii) providing vegetation cover on the mine waste dumps in order to stabilise them, (iv) adopting measures to restore clayey soil well suited for agriculture, (v) realigning tributaries to Tumuni and Banbahal nalas and (vi) identifying suitable sites for new water tanks near Sonepur and other affected villages.
Subjects:Coal fields; Coal mines; Drainage; Environmental analysis; Erosion features; Erosion surfaces; Landforms; Mines; Mining; Mining geology; Open-pit mining; Paleozoic; Pediplains; Permian; Pollution; Raniganj Formation; Reclamation; Surface mining; Surface water; Upper Permian; Vegetation; Waste disposal sites; Asia; Bardhhaman India; Burdwan India; India; Indian Peninsula; Raniganj coal field; West Bengal India; Eastern Coalfields; Sonepur-Bazari Project
Coordinates:N231500 N231500 E0875100 E0875100
Record ID:2002055194
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute.
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