Location, Physiography and Climate• Gevra mining block having an area of about 19.03 sq.km is located in the central part of korba coalfield.• Latitude 22°18’00’’ and 22°21’42’’ and Longitude 82°32’00’’ to 82°39’30’’.• The elevation ranging from 288m to 328 m above mean sea level.• The climate of the area is dry to moist tropical.• The temperature rises to 48° in May and drops to 7° in December. The average annual rainfall is 1265 mm.
METHOD OF MINING• Gevra Opencast Project is being worked by opencast methods deploying shovel dumper combination and HEMM configuration.• Deployment of draglines is not suggested as the combined thickness of the lower most seams i.e. LK seam (>48 m) will restrict the efficient deployment of dragline mining; and the inter- parting between LK(top) and LK(bottom) does not offer adequate load to justify the deployment.
Drilling & Blasting• Drilling and blasting would be required only in OB bench before excavation by shovels.• 381 mm RBH drills will be deployed for shovel benches of 42 cum rope shovel whereas 250 mm RBH drill will be deployed for benches of 12 cum shovels.• 160 mm drills have been provided for drilling in benches of bands and partings.• The explosives consumption has been envisaged as 0.30 – 0.35 kg/cum of excavation.
Soil Disposal Planning• The proposed sequence of mining is ideally suited for achieving the objective of placing maximum possible waste in the internal dumps.• The opencast mining of Gevra block involves removal of 1267.00 M.cum. of Overburden.• Presently, internal backfilling is being done in the quarry and considerable volume of OB is also being dumped in the external dump.
Pumping and Drainage• The pumping system at Gevra Expansion Project (35 Mty) has been designed to dewater the inflow of water due to precipitation falling within the active pit limit during the monsoon season to enable the mining activity to continue round the year.• The surface within the mine intake area is gently undulating and local drainage pattern is towards the seasonal nala i.e. Laxman Nala. This nala drains into Ahiran river located towards north east
Power Supply in the expansion report• Gevra opencast expansion project will receive power at 33kV from existing 132/33kV substation of SECL at Gevra.• The specific energy consumption of the project has been estimated as 3.408 kwh/t for a targeted production of 35 Mt per year. Substation No. Voltage ratio Transformer Capacity 1 33/3.4kV 2x6MVA 2 33/6.5kV 2x16MVA 3 33/6.6kV 2x16MVA
Manpower & ProductivityThe sanctioned manpower for Gevra Opencast Expansion Project (25 Mty)was 2725.the group-wise break-up of incremental manpower from 25 to 35 Mty isgiven below Sl no. Particulars Nos. % of total manpower 1 Workers 355 64.43 2 Monthly Paid staff 167 30.31 3 Executives 29 5.26 Total 551 100.00
Civil Construction• excavation Workshop Complex.• E&M Workshop Complex.• Residential buldings.• Roads and culverts.colony roads and culvertsapproach roads and culvertshaul roaddiversion of road
Land Acquisition• The break-up of the land is as follows:- The sanctioned Project Report (25 Mty) will require 3584.671 Ha of land which is already acquired. Additional land reqirement for Project Report (25 to 35 Mty) is assessed as 599.815 Ha. Particulars Forest Govt. Tenancy Total Rev A Land already acquired a. Quarry 385.121 289.514 1113.14 1787.77 4 9 b. Safety zone 3.472 4.643 75.385 83.500 c. Infrastructures & 515.434 261.859 936.099 1713.39 rehabilitation 2 Sub-Total (A) 904.027 556.016 2124.62 3584.67 8 1
B Additional land requirementa Quarry area 78.507 10.682 160.282 249.471b Safety zone 56.096 58.587 235.661 350.344c Infrastructure & rehabilitation 0.00 0.00 0.00 0.00 Sub-Total(B) 134.603 69.269 395.943 599.815C Total land for the project (A+B)a Quarry area 463.628 300.196 1273.42 2037.25 6 0b Safety zone 59.568 63.230 311.046 433.844c Infrastructures & 515.434 261.859 936.099 1713.39 Rehabilitation 2 Total land for the project 1038.63 625.285 2520.57 4184.48 (A+B) 0 1 6
Air Pollution Status• The RDS was placed at various sampling station to collect sample .• RDS were run for 48 hour every week (for three months to represent one season) to collect SPM,SO2 and NOX sample.
• AIR QUALITY STANDARD: in micro gm/cubic m STANDARD CATEGORY SPM RPM SO2 NOX NAAQS(NATIONA INDUSTRIAL( 500 150 120 120 L AMBIENT AIR A) QUALITY STANDARD RESIDENTIAL( 200 100 80 80 B) SENSITIVE(C) 100 75 30 30 AS PER AS MOEF OLD MINE(A- 600 300 120 120 NOTIFICATION O) GSR 742(E) DATED 25TH NEW 500 250 120 120 SEPTEMBER MINES(A-N) 2000
• AIR QUALITY DATA FOR GEVRA PROJECT(24 HOURLY) DATE OF SPM RPM SO2 NOX SAMPLING 07.05.11 302 145 19 23 23.05.11 280 132 24 28 No Of 2 2 2 2 Observation ARITHMETIC 291 138.5 21.5 25.5 MEAN
Water pollution status• Sample were collected from different location in May 2011 and analysed.• From the surface water sources , after removal of floating/extraneous material, 3 lt of representative water sample were collected in plastic cans as per as IS:3025 and transported to laboratory for physiochemical test.
• STANDARD PARAMETER PH TSS(mg/l) COD(mg/l) O&G(mg/l) Below detection 0.01 5 20 1 limit AS PER AS MOEF 5.5 TO 9.0 100- 250 10 NOTIFICATION GSR 200(FOR 742(E) DATED 25TH IRRIGATIONAL SEPTEMBER 2000 LAND)
NOISE POLLUTION STATUS• The noise level were measured by noise level meter continuously for 24 hrs at hourly interval ,in decibel under ‘A’ weighted average .Values were reported as equivalent day , night and day night noise levels.
• STANDARD: MAXIMUM PERMISSABLE AREA CODE CATEGORY OF DAY TIME NIGHT LIMITS IN DB(A) OF AREA TIME AMBIENT NOISE LEVEL AS PER MOeF NOTIFICATION S.O 123(E) DATED 14aTH A INDUSTRIAL 75 76 FEBRUARY 2000 AND GSR742(E) ,DATED 25TH SEPT 2000 B COMMERCIAL 65 55 C RESIDENTIAL 55 45 D SILENCE 50 40 ZONE
• NOISE QUALITY DATA FOR GEVRA PROJECT S/L NO AREA DATE DATE NOISE LEVEL CODE Day time Night time 1 A 03.05.201 19.05.201 68.7,69.1 62.7,63.2 1 1 2 C 03.05.201 19.05.201 61.8,58.9 52.6,53.6 1 1 3 C 03.05.201 19.05.201 52.6,53.2 41.6,42.3 1 1
Control measures for air pollution• Water spraying by water Sprinklers (7 nos. of 28 KL and additional 3 to 6 nos. of 10 KL ) are being done regularly on approach roads , coal transportation roads and within the mining area to minimize the dust generation.• Conveyor belts for movement of total coal mined from mine pit to surface will be installed to reduce dust generation due to transportation.• About 36.98 lakh saplings planted in project area for dust suppression.• Drills have been fitted with dust extractors.
Control measures for noise• About 36.98 lakh saplings already planted for noise attenuation.• High capacity machines like 42 Cum. Shovels & 240 tonne dumpers, to be deployed in mine. This will ensure reduced number of vehicular trips, there by reducing noise levels.• Provision of ear muffs/ear plugs to workers subjected to noise level above recommended limits.• Routine maintenance schedules for machineries to eliminate noise as far as possible.
Control measures for water pollution• settling tank to treat mine water has been commissioned.• oil & grease trap for workshop effluent treatment has been commissioned.• mine sumps will act as a water recharge structure.
MINE CLOSURE PLAN• Mine closure is not something that happens at the end of a mine’s life, rather mine closure is an ongoing series of activities starting from the planning stage of a mine and ending with a suitably restored site that can be returned to the community.• The extent of impacts are classified under:- Environmental Aspects Technical Aspects Social Aspects Safety Aspects
Environmental Aspects• Hydro-geology• Reclamation of dumps and adjoining area• alternate use of land• rehabilitation and resettlement
Technical aspects• Dump stabilization• Top Soil Management• Disposal management of hazardous material
Social aspect• Employment• Association & Consultation with Stake holders• Infrastructure and Services
safety aspects• Management of voids, fractures• Safety of adjoining mines• Dealing with fire