MINEO CASE STUDY

MINEO CASE STUDYPresentation by-Dageshwar Verma Jasmeet Saluja Keyur Bhushan Chandra NIT RAIPUR

PROBLEM STATEMENTTo prepare a feasibility report for mining the deposit by Underground Mining Method below the Open Pit.

Various points are to be included as mentioned, (which have been considered in the following slides)1. EIA (Environmental Impact Assessment)Lease area have to be extended on the surface for shafts & various surface feature requirements. Impact on land, air, soil due to underground will be limited to leasehold area of opencast mine whose right have already been taken.

2. EMP ( Environment Management Plan)Following mitigation measure will be taken:To ensure proper water management garland drains have been made around the periphery of the quarry. For water pollution control measure inflow and quality of the sewage will be checked before meeting to the water resources. Checking the Vibrations at the surface caused by underground blasting. Hence taking into consideration Minimum Vibration causing explosive into use.

Clearence from MoEF & SPCBThe copy of EMP of proposed project is attached and clearance lenience of previous open pit mining have been send.Mitagative measures to protect environment is listed. The Project includes Rs. 1948.95 lakhs for environmental protection measures.Since we are working at and disturbing the ground water level, clearance from the SPCB needs to be taken regarding Ground Water Level.

PERMISSION FROM INDIAN BUREAU OF MINES

In compliance with METALIFERROUS MINE REGULATION 1961, MINE ACT 1952, MINE RULE 1956 all the provisions have been taken into consideration.Exploration, Mining, Solid Waste Management, Blasting, Mine Drainage, Mineral Beneficiations, Community Social Responsibility, Environment Management Plan are attached with actual data.

PERMISSION FROM DGMSTo ensure that all the Operations and Equipments are in compliance with the safety and rules and regulations of DGMS.

THE ACCESS LAYOUT OF UNDERGROUND MINING

Key element to define the no. of primary access and its section area are:Allow adequate production rate to the s/fProvide the necessary ventilationSufficient openings to allow transit of equipment, from s/f to u/g and bet. Levels within the mineConsidering all the geo-mining, geo- technical and techno-economic data the proposed underground mine is accessed through Three Vertical Shafts from the pit top itself. These shafts are situated in the footwall side along the strike of ore deposit.Two shafts at the extremities are ventilation with exhaust fan while the mid one is production and service shaft.

MINE DEVELOPMENTDevelopment comprises of 2 stages:

PRIMARY DEVELOPMENT Includes Development of Shafts, Decline, and Drifts in footwallSECONDARY DEVELOPMENT - Raise, Winzes, Main Levels, Sub-levels, Slot Raises, Undercuts,

Design & Location of ShaftLocation of shaft is an imp factor in the costs of production and development.In our Mine Layout, we have adopted a 3 Shaft Method.Three shafts are needed when the mining area is large and the ventilation system with only 2 shafts become insufficient

In this case, ventilation shafts have a smaller diameter than the production shaft which is generally kept in the laterally away but at the center of the ore body.

3 Shaft SystemDesign of DeclineFeatures of rampSlope bet. 10-16 degrees.15 m radius of curve.Decline is performed in loops, with a slope of 16 deg in the straight section and 10 deg in curvesDimensions of Decline used is 5.5m in width & 4.5m in height.MAIN ACCESS Two Ventilation Shafts are situated in along the strike direction 1.8 km apart in the footwall side and have diameter of 4.5m and fitted with the exhaust fan.The shafts are 360 m in the depth & opens up at 1st level.The Production Shaft is situated midway of the two ventilating shaft.This shaft serves the purpose of Material and Man Winding and also as Downcast Shaft.The depth of shaft is 550m.Decline is provided from the surface to serve machinery transport from the surface to mine and within the mine.

PRIMARY MINE DEVELOPMENTPRIMARY DEVELOPMENT

NAME OF OPENINGSIZEVENTILATION SHAFT (2 in No.)4.5m diameterPRODUCTION SHAFT7.5m diameterDRIFT 4.5m x 4mCROSS-CUT4.5m x 4mDECLINE5.5m x 5m SECONDARY DEVELOPMENT Considering the ore strength, the level interval is fixed at 60 m for the first level and 70 m for the subsequent levels.

Raising will be done by Raise Borer.

The Chain Pillar of 60m is left above the top level 1 in both side of ventilation shaft.

MINING METHOD

Applicability of Sublevel Stoping:Steeply Dipping OreThick Orebody Stable Hanging Wall & Foot WallStrong Ore which separates readily from the wallsRegular Ore Boundaries

Since the ore body is regular, large, strong to fairly strong and competent (RMR is good and UCS is 50MPa) and the wall rock are self supporting (having UCS 100 to 75 MPa), in short meeting all the requirements of SUBLEVEL STOPING. Hence we consider Sublevel Stoping as our Mining method .Cut & Fill Method could have a possible choice but Sub-level stope appeared to be more appropriate .

STOPE LAYOUT

Considering the geo technical data available stope layout is designed.The stope dimension:-length 100m, height Level 1 60mLevel 2 70mLevel 3 70mwidth of 60m.The Sill Pillar 10m (includes finger raises).Two sublevels are at the are 25 m apart vertically.The sublevels are tied to footwall ramp system.The ore extraction system consists of draw point which are 9m apart ( from center to center) and communicated to haulage drift.

Proposed Mining Machinery for Mine WorkingMachineryNumbersDevelopment Jumbo for main headings6Development Loader both Diesel & Electric5Shotcrete Machine2Explosive Charger2Rock Bolter- Stope2Blast Hole Drill4Production LHD- Diesel8Impact Rock Breaker8Service Vehicles13Main Pumps Automatic12Cage Loading2Skip Loading2DEVELOPMENT PLAN AND SHEDULING

The time taken two develop the mine is estimated 3 Years .this will include shaft sinking period of 2 years. Drifting rate will be 100m/month for levels and crosscuts which will take additional 1 year to reach the ore body. After sinking up to first level the development of first horizon is being continued while sinking further.Scheduling of Main Shaft Sinking is as follows:Sl.No.MilestoneTargetActualVariance (Days)Status1Main Sink upto 150 m2Main sink to 565 m (First Station)3Main shaft Equipping start4Hoisting system commissioning5Main shaft commissioningProduction plan and scheduling Keeping in mind the target of 3 Mt of ore production schedule the proper production

YearProduction/MT1--2--30.1941.552.56 -353.0Total Reserve140MTNo. of working Days300No. of shift3Working hours per shift6Estimated target per day10,000 tonsManpower RequirementOPERATIONSSKILLED MAN REQUIREMENTMachine Operators60Helpers40Mining Worker150LIFE OF MINE It has been given that Total Reserve = 140MTTaking 70 % extraction of total reserve and production rate of 3Mt/yearStoping Period = (140*0.7)/3 = 30yrs (approx.)Therefore,Life of mine = Development Period + Stoping Period + Additional Time = 4years+ 30year + 2 years = 36 years

PROFITABILTY AND COST ANALISIESAverage tenor = 1.25 Production rate = 3Mt/year Current value of copper metal = 415364.375INR per tons With the production rate of 3mt/y total metal produced = 3Mt0.0125 = 0.0375mtTaking current stock rate total value of metal produced = 0.0375 *106 * 415364.375= 1557.61 cr

REFERENCESADRIASOLA, P & OLAVARRIA, S. Proyecto Chuquicamata Subterrneo.Proceeding 56th IIMCh Conference, Chilean Institute of Mining Engineers, Santiago,Chile, 2005.ARANCIBIA, E & FLORES, G. Design for underground mining at ChuquicamataOre body. Scoping engineering stage. MassMin 2004: Proud to be Miners, A Karzulovic M Alfaro (eds), Chilean Engineering Institute, Santiago, Chile, 2004, pp 603-609.El Teniente mine, Codelco Chile.SME MINING ENGINEERING HANDBOOKKIDDS CREEK MINES

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