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Location: 115 km SW from Nagpur, India
P.O.: ShembulShembulIndia222907
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Amalgamated Yekona I & II OC block is the Northern extension of western limit of Wardha Valley Coalfield. New Majri UG mine is is also situated in the Wardha Valley coalfield. Wardha Valley Coalfield (WVC) is a NW-SE elongated structural basin with its coal bearing zone spreading over an area of 800 sq. km. This coalfield has around 40 opencast coal mines, which are largely of medium scale type with annual coal production from each mine ranging mostly between 0.5 and 1.5 million tonnes and mine depths varying between 70 and 250 m. The slope forming materials in these mines mainly consist of soil and sandstone as overburden followed by a composite coal seam of 15-17 m thickness. The soil consists of black cotton soil and silty/clayey sand and is classified mainly as clay of high plasticity. The sandstone rock mass belongs to Kamptee and Barakar formations. The Kamptee sandstone acts as an unconfined aquifer and is a major source of ground water. The Kamptee sandstone is very weak to weak rock with uniaxial compressive strength in the range of 3–25 MPa (ISRM 1981). Its rock mass rating (RMR) (Bieniawski 1989) varies in the range of 34-40 signifying poor rock mass conditions. The Barakar sandstone is a predominantly medium weak rock with compressive strength in the range of 25–50 MPa (ISRM 1981). Its RMR varies in the range of 35-55 signifying poor to fair rock mass conditions.Structural disturbances in the form of strike faults, which run parallel to the slopes also cause instabilities. Besides these, external loading on slopes by overburden dumps also contributes towards slope instability in some cases.Amalgamated Yekona I & II OC mineStrike & Dip: • Yekona – I block Coal Seam dips towards SE in the Western part and towards East in the Eastern part. The gradient of seam is 1 in 8 (60) to 1 in 17.5 (30) in the Western part and 1in 6 (90) to 1 in 8 (60) in general in the eastern part with local flattering. The strike of coal seam in the Western part is NESW whereas; in the eastern part it is NS with minor swing.• Yekona – II BlockThe general strike of the coal seam as determined from the floor contour plan of composite seam is WNWESE dipping SSW however local swings in strike also observed in the area. The dip of the formation in the block is in 1 in 4 to 1 in 7.5.a) Middle part dip is 11.3 ° due SSW. b) Western part dip ranges from 7.6 ° to 11.3 ° due SSW. c) Eastern part dip is 14 ° due SSW (Gradient 1 in 4). New Majri UG to OC mineAt the New Majri UG to OC average thickness range of seams from 12.88 to 18.89 m; average strike length is 2163 m; width on surface is 1316 m (dip rise) and width on floor is 1073 m (dip rise). Average grade is G-11.
Contractors crush coal using hired semi-mobile crushers.
