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Coal Mining Field Trip

Ib Valley

(04/12/2013 to 07/12/2013)

Report on Underground Coal Mining

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Overview

Mahanadi Coalfields Limited is one of the eight subsidiaries

of Coal India Limited. It was carved out of South Eastern

Coalfields Limited in 1992 with its headquartersat Sambalpur.

Coal mining trip for our batch was scheduled in Ib valley

area headed by Mr. R.P.Gupta, General Manager.

The Ib-valley area is bounded by latitudes 2131N and

2214N and longitudes 8332E and 8410E. The coalfieldextends over an area of 1460 sq km and covers parts of

Sambalpur, Jharsuguda and Sundargarh districts of Odisha. It

has an undulating topography which is characteristic of the

Formations of the Gondwana Super group. The coalfield is

known as Ib-valley coalfield named after the river Ib, a

tributary of the river Mahanadi. Ib Valley Coalfield hasreserves of 22.3 billion tonnes, the third highest in India

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Introduction

Orient area mine no.3 (underground coal mine )is located in the Ib valley area

of Mahanadi coal field. This mine is located in Rampur village of Jharsuguda

district of Odisha.

Coal is extracted from three different seam of Lajkura seam.

Mine is extended up to an area of 1130 hectare.

Mine Specification

Method of mining:- Bord and pillar Degree of gassiness:- 2 Seam thickness:- 3-3.5 m Parting thickness:- 2-4m Production:-1000 te/day Seam inclination:- 1 in 10 Working face:- 10 no. Face OMS:- 2.5 te OMS:- 1 te Grade :- G9 (non-coking coal)

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Mode Of Entry

Two incline and one shaft were there. One incline was used for coal transportation via conveyor belt Second incline was for transportation of men and material. First we had to walk down some steps after that man riding system was

there up to level-56 .After that we reached the face through the network

of drivages and travelling road.

Inclination of incline was 1 in 5.

Dimensions Gallery width:- 4.2m Gallery height:- 2.5-3 m Pillar width:- 25-35 m Isolated stoping:- 1m thick brick wall Ventilation stoping:- .38 m thick

Support System

Roof bolt Side wall stitching Chock mat Wooden props Steel props

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Wire strapRoof bolt specifications:

o Material:- mild steelo Bolt length: 1.5mo Grout material: Cement capsuleo Spacing: 1.5m

Drilling and Blasting

Drilling Equipment: Universal Drilling Machine, Jack Hammer Drilling pattern: Wedge-cut No. Of holes per face: 12 Depth of hole: 1.5m Diameter of hole: 32 mm

EXPLOSIVES

P5 type explosive(Nova Coal-5) Diameter of cartridge: 32 mm Weight of cartridge: 185 gm Delay type: 1,2,3,4,5,short delay(25ms) Cap sensitive detonator Three cartridges per hole

Magazine

200 ft away from main mine premises Capacity:- 450 kg explosive Explosive type:- P5 150 g explosive per cartridge 2500 no. Of detonator stored Lightning protection to avoid accidents Security alarm was there but not in working condition :P

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Haulage System

Blasted coal is taken from the face by LHD to the face conveyor which

was further transferred to main conveyor then taken out to the surface

via incline.

Capacity of LHD bucket:- 1.5 te

Under Ground Machinery

Load-haul-dumper:- 10 no.o Capacity of bucket:- 1.5 tonneo Power:- via electrical cables.

Universal drilling machine:- 2 no.o Power:- electro hydraulically poweredo Diameter of drill hole:- 42 mmo Number of booms:- 1

Dewatering pumpo Number of pumps:-3o Capacity:-3500 gallon per minute.o Head:-350 m

Conveyor belto Material:- PVCo Joint:- R5o Pony belt:-200 ton/hro Gate belt:- 200 ton/hr, length:-600-800 mo Trunk belts:- 4 no., total length:- 1700 mo Capacity:- 300 ton/hro Belt runs for 4 hour on an average.

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Ventilation System

Intake of air through incline and return through shaft. Fans used:o PV 300main fano PV 200 - standby

Shaft diameter: 3-4 m.Fan(PV 300) specifications:

Capacity:8800 m3/min Axial flow: exhaust type Fan Pressure : 92 mm w.g. Fan Speed :670 rpm Motor specificationso Slip ring induction motoro Power:-350 kwo Voltage:- 3.3kv

To reduce speed V type groove pulley were used.

Evasee was also there to reduce losses.

Telemonitoring System

Tele Monitoring System was installed to monitor mine environment.

Sensors were installed in the return pathways

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It is used for detecting following gases: CO2 O2 N2 CH4