The Environement Clearance letter No. J-11015 /346/207-IA ... - IMFA

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(vi) The solid waste in the form of over burden, sub-grade ore and nickel ore bearing material shall be stacked separately. The solid waste in the form of over burden, sub-grade ore and nickel ore bearing material are being stacked separately. Over burden Qty (CuM) (Including Nickel bearing material) Target as per mining Scheme for 2012-13 During the year (April'12 to Sept'12) CUMULATIVE TOTAL 875288 238675.34 7580533.34 Sub Grade Qty. (MT) Nil Nil 6,12,929 Nickel Ore Material Qty (CuM) 2-3% of total OB excavation 8399 11,11,039 (vii) The overburden generated shall be stacked at earmarked dump site only and it should not be kept active for a long period of time. The overburden generated is stacked at earmarked dump site and it is stabilized by vegetating scientifically with suitable native and other species without keeping the dump active for a long period of time. The total height of the dump shall not exceed 60m. The total height of the dump is 60m (partly) at the end of September’12. Proper terracing of OB dump should be carried out so that the overall slope shall not exceed 28 degree. The recommendations made in the slope stability study carried out through Central Mining Research Institute shall be effectively implemented. The OB dump should be scientifically vegetated with suitable native species to prevent erosion and surface run off. In critical areas, use of geo textiles shall be undertaken for stabilization of the dump. Proper terracing of OB dump has been carried out so that the overall slope is 25 degree at the end of month sept 12. The recommendations made in the slope stability study carried out through Central Institute of Mining and Fuel Research are being implemented effectively. OB Dump has been stabilised by planting native species such as Bahada, Neem, Sisoo, Chakunda etc. Earlier, coir matting over an area of 2976m 2 at slope of the 1 st stage OB dump was carried out. During the period under review, coir matting over an additional area of 3890m 2 has been carried out at slope of the 2 nd stage OB dump for the purpose of stabilization and to avoid generation of suspended solids from the fresh (finalised) dump slope during rainy season.
(viii) (ix) (x) Catch drains and siltation ponds of appropriate size shall be constructed for the working pit. OB and mineral dumps to prevent run off of water and flow of sediments directly into the Damsala Nallah and other water bodies. The water so collected should be utilized for watering the mine area, roads, plantation etc. The drains should be regularly desilted and maintained properly. Garland drains, settling tanks and check dams of appropriate size, gradient and length shall be constructed both around the mine pit and over burden dumps to prevent run off of water and flow of sediments directly into the Damsala Nallah and other water bodies and sump capacity should be designed keeping 50% safety margin over and above peak sudden rainfall (based on 50 years data) and maximum discharge in the area adjoining the mine site. Sump capacity should also provide adequate retention period to allow proper settling of silt material. Sedimentation pits should be constructed at the corners of the garland drains and desilted at regular intervals. Storm water return system should be provided. Storm water should not be allowed to go to the effluent treatment plant during high rainfall/ super cyclone period. A separate storm water sump for this purpose should be created. Dimension of retaining wall at the toe of over burden dump and OB benches within the mine to check run off and siltation shall be based on the rainfall data. Mine water discharge and/or any waste water shall be properly treated to meet the prescribed standards before reuse/discharge. The run off from OB dumps and other surface run off should be analyzed for Cr+6 and in case its concentration is found higher than the permissible limit, the waste water should be treated before discharge/ reuse. 4 nos settling ponds, 6 nos check dams & 2600m long garland drains have been provided for channelizing the surface run-off. This run off is first coursed towards settling ponds, so that it does not flow directly to Damasal Nallah. . The drains are desilted regularly and are maintained propeorly. Settling pond of capacity 150 CuM & 2112 CuM for ETP- 1; 1764 CuM for ETP-2 and 475 CuM for ETP – 3 have been excavated to control sudden rainfall. Sump capacity provides adequate retention period to allow proper settling of silt material. 1400m long retaining wall at the toe of over burden dump is 1.2m (H) x 0.3 m (W), which is adequate to check run off and siltation. There is no mine discharge from quarry area in Band-I. Water is collected in a sump and used for dust suppression and plantation. However, an ETP plant was installed in 2004 to treat the water in event of any significant mine discharge in future and trail run conducted. Thereafter, ETP-I was not operated as there is no mine discharge available for disposal outside the ML area. The run-off from OB dumps and other surface run off is analyzed for Cr+6 and it is found within permissible limit. In case its concentration is found higher than the permissible limit, provision is there for treatment before discharge at ETP-2 and ETP-3
Page 1 and 2: Conditions of MoEF, Govt. of India,
Page 3: Other conditions of the earlier Env
Page 7 and 8: (xvii) Plantation shall be raised i
Page 9 and 10: (xxiii) (xxiv) Vehicular emissions
Page 11 and 12: Sl No B. General Condition Status (

The Environement Clearance letter No. J-11015 /346/207-IA ... - IMFA

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