MINEO CASE STUDY

Presentation by-

1. Dageshwar Verma

2.Jasmeet Saluja

3. Keyur Bhushan Chandra

NIT RAIPUR

PROBLEM STATEMENT

• To 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 & SPCB

• The 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 DGMS

To 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/f

• Provide the necessary ventilation

• Sufficient openings to allow transit of equipment, from s/f to u/g and

bet. Levels within the mine

• Considering 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 DEVELOPMENT

• Development comprises of 2 stages:

• PRIMARY DEVELOPMENT – Includes Development of Shafts,

Decline, and Drifts in footwall

• SECONDARY DEVELOPMENT - Raise, Winzes, Main Levels,

Sub-levels, Slot Raises, Undercuts,

Design & Location of Shaft

• Location 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 System

Design of Decline

• Features of ramp

• Slope 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 curves

• Dimensions 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 DEVELOPMENT

• PRIMARY DEVELOPMENT NAME OF OPENING SIZE

VENTILATION SHAFT (2 in No.) 4.5m diameter

PRODUCTION SHAFT 7.5m diameter

DRIFT 4.5m x 4m

CROSS-CUT 4.5m x 4m

DECLINE 5.5m 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 Ore

• Thick Orebody

• Stable Hanging Wall & Foot Wall

• Strong Ore which separates readily from the walls

• Regular 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 60m

• Level 2 70m

• Level 3 70m

• width 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 Working

Machinery Numbers

Development Jumbo for main headings 6

Development Loader both Diesel & Electric 5

Shotcrete Machine 2

Explosive Charger 2

Rock Bolter- Stope 2

Blast Hole Drill 4

Production LHD- Diesel 8

Impact Rock Breaker 8

Service Vehicles 13

Main Pumps –Automatic 12

Cage Loading 2

Skip Loading 2

DEVELOPMENT 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. Milestone Target Actual Variance (Days) Status

1 Main Sink upto 150 m

2 Main sink to 565 m (First Station)

3 Main shaft Equipping start

4 Hoisting system commissioning

5 Main shaft commissioning

Production plan and scheduling

Keeping in mind the target of 3 Mt of ore production schedule the proper production

Year Production/MT

1 --

2 --

3 0.19

4 1.5

5 2.5

6 -35 3.0

Total Reserve 140MT

No. of working Days 300

No. of shift 3

Working hours per shift 6

Estimated target per day

10,000 tons

0

0.5

1

1.5

2

2.5

3

3.5

Year 1 Year 2 Year 3 Year 4 Year 5 Year 6-35

Production MT

Production

Manpower Requirement

OPERATIONS SKILLED MAN REQUIREMENT

Machine Operators 60

Helpers 40

Mining Worker 150

LIFE OF MINE

It has been given that Total Reserve = 140MT

Taking 70 % extraction of total reserve and production rate of 3Mt/year

Stoping 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 ANALISIES

• Average 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

= 3Mt×0.0125 = 0.0375mt

• Taking current stock rate total value of metal produced

= 0.0375 *106 * 415364.375= 1557.61 cr

development

30%

load & haul

20%supervision &

service

14%

stoping

11%

general

6%

hoisting

5%

power

3%

stope fill

1%

crushing &

conveying

10%

Mining-cost distribution

REFERENCES

• ADRIASOLA, P & OLAVARRIA, S. Proyecto Chuquicamata Subterráneo.

• Proceeding 56th IIMCh Conference, Chilean Institute of Mining Engineers, Santiago,

• Chile, 2005.

• ARANCIBIA, E & FLORES, G. Design for underground mining at Chuquicamata

• Ore 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 HANDBOOK

• KIDDS CREEK MINES