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LEDO OCP DETAILS.
1) HISTORY:
Introduction
The Ledo OCP ( area 0.85 Sq. Km.) situated in Northern part of Makum Coalfield
situated at 10Kms North East of Margherita town i.e. HQ. of NEC (CIL) and 60Km. south east
of Tinsukia district. The area is connected to the rest of the country by NH.38 and BG Rly line
which extends upto Tirap siding which is 1.5 Km of the west of the property.
The project is surrounded by Ledo town in the west, Ledo pani nullah in the east
and Tirap OCP in the South Eastern side. Sixty percent of the area under reference is builtup area
and occupied by surface structures i.e. Rly line, NH, Colliery workers residential quarters, brick
factory etc.
The project is planned to be executed in form of three pits namely Pit I, Pit II and
Pit III . At present Pit II is in operation.
Geology:
Ledo Mechanised OCP block, covering an area of 0.85 sq km, is situated in the
Northern part of Makum Coalfield and is defined by North latitude 27o- 17‟-25” and 27
o-17‟-
50” and East longitude 95o – 45‟ to 95
o-45‟-45 ” falling in the Survey of India Toposheet
No.83M/1.
The coal bearing Tikak-parbat formation in Ledo mechanised OCP is disposed as
an elongated E-W trending isolated closed “Synformal basin” surrounded by older Baragolai
formation. The E-W trending longer axis stretches about 1.5 km while the N-S trending shorter
axis stretches just about 300m. The western closure of the synformal basin is wider than that of
the eastern closure. The strate in general strike in an E-W direction in both the limbs with local
swings leading to development of minor warps. Existence of four seams viz. „60 ft‟, „7ft/new
seam‟, „20ft‟, and „5ft‟ seam has been established in this block. The bottom most 60‟ seam is the
most important coal seam. The other coal seams are impersistent and have very limited area of
disposition. The 60‟ seam is almost virgin in the entire block except a small linear stretch in the
southern limb where the seam has been extracted manually through OC method. The 60‟ seam
occurs splitted at most places.
The 7‟/New seam is not well developed within the area. The 20‟ seam is restricted
to two small axial regions in the east and the west. 5‟ seam is the youngest seam developed in
this region and its development is restricted to very small patches in the eastern part only.
A net geological reserve of 6.22 MT from 60‟ seam only has been considered for
the purpose of estimating the quarriable coal. Available small quantity of quarriable coal reserves
from the other younger seams have been taken as an overburden and may be considered as bonus
over the total resources of 60‟ seam.
Reserves and Coal Characteristics:
Total Reserve: 6.22 MT
Mineable Reserve: 1.68 MT
SL. No. Particulars Unit Pit-I Pit –II Pit-III Total
1. Mineable
Reserves
Mt 0.29 1.03 0.36 1.68
2. Overburden
Quantities
Mn3 1.49 6.02 1.30 8.81
3. Stripping
Ratio
M3/t 5.13 5.84 3.61 5.24
Rate of Production: 0.15 MT per Annum.
Life of Mines: 14 years.
Grade of Coal: Grade G-1 & G-2.
Grade Ash % : Moisture %: V:M:% Gross Calorific Value
G1 5 - 8.3 2.3-2.61 39-41 7300-7400 Kcal/ Kg
G2 11.3- 13.5 2.3-2.7 39-41 6700 - 7000 Kcal/ Kg
2) PERFORMANCE ACHIEVED :: PRODUCTION
Year Coal Lakh
(Tonne)
OB Lakh (Cum) S.R
2008-09 0.39 3.67 1:9.4
2009-10 0.84 6.95 1:8.2
2010-11 1.14 7.3 1:6.4
2011-12 1.27 7.63 1:6
2012-13 1.27 6.11 1:4.8
2013-14 0.96 7.46 1:7.7
2014-15 0.001 1.06 1:106
2015-16(UPTO JAN
2016)
0.34 8.90 1:26.1
3) PERFORMANCE ACHIEVED :: DESPATCH
Year Despatch (Lakh
(Tonne)
Transporting (Lakh
(Tonne)
Offtake (Lakh
(Tonne)
2008-09 Nil 0.39 0.39
2009-10 0.34 0.49 0.84
2010-11 1.02 0.05 1.02
2011-12 1.03 0.14 1.02
2012-13 0.84 .012 1.18
2013-14 0.80 0.38 1.23
2014-15 0.27 0.09 0.89
2015-16(UPTO JAN
2016)
0.12 0.00 0.12
4) PRESENT PRODUCTION OF OB & COAL STATUS (AS ON 2/2/2016)
COAL =34174 Tonnes
OB =890743 Cum.
5) PERMISSIONS OBTAINED:
List of Permission & Clearances Obtained:
Date of opening 22-08-2008
NOC with respect of mine water pumping from
Central Ground Water Authority
13-10-2008
Environmental clearance obtained from MOEF 12-12-2008
DGMS permission obtained 02-02-2009
Coal controller permission obtained 31-03-2009
Controlled blasting permission obtained 16-10-2009
Permission for use of HT electrical installations 05-01-2010
Consent to operate mine by APCB 25-06-2012
6) MACHINERY STATUS( Contractor’s machineries)
Sl.No ITEM AVAILABLE
1 EXECAVATOR( volvo 480, 2.5cub. met) 02
3 DUMPER(MERCEDES 25 TON) 12
4 DOZER(KOMATSU D-65) 02
5 ROAD GRADER(KOMATSU) 01
6 Water Tanker(AMW) 01
7 DIESEL BROWSER 01
CIL machineries- One Pay Loader
7) MANPOWER DETAILS: WORKERS = 127 (INCLUDING STAFF)
OFFICER = 06
8) ENVIRONMENT ::
STATUS REPORT ON ENVIRONMENTAL PROTECTION MEASURES
Name of the Coal/lignite mine/block: LEDO OCP
a) Type: OCP/UG/Mixed OCP
b) Total life of the mine: 14 years
c) Balance life of the mine: 07 years
Name and address of the owner: North Eastern Coalfields
Coal India Limited
Margherita, Assam-786181
Environmental Clearance Approved by…… (on date) Ministry of Environment & Forest
12/11/2008
i) Leasehold area of the Mine: 101.00 Ha.
ii) Project Area of the Mine: 61.00 Ha.
iii) Mining Area 22.56 Area
Mine Closure Plan approved
by……………………………(on date)
Coal India Limited Board.
02/08/2013
Reserves of Coal/Lignites (as per mining plan): 1.68 MT
Details of aforestation: Year Plantation done
2014-15 3000 Nos.
2015-16 200 Nos (till date)
Details of Water Quality Management
a) All the pumped out effluent from the mines is taken to effluent treatment plant
(ETP) where they are treated with lime,
alum and polyelectrolyte. The effluents are tested before discharging them to
natural drainage system.
b) Samples of the discharged water are taken
and analyzed by agency approved by APCB on monthly basis.
Details of Air Quality Management a) Water spraying is done with water tankers
amounting at least 72KL/ day on all the haul roads, working faces, dump yards,
coal stocks.
b) Control blasting is done with NONEL (DTH- Down the Hole and TLD- Trunk
Line Delay) to minimise dust generation.
c) Allowing sufficient time for settlement of the coarser particle after blasting.
d) Blasting is done day time only.
e) Covering of Coal transported from the
stock in truck by tarpaulin before leaving the mine premise.
f) Restricting the speed limits of the dumpers
to 30 km/Hr to minimize the dust generation.
g) Restricting the loading of the dumpers
within the carrying capacity to arrest
spillage to prevent dust generation. h) Removing of accumulated dust in the haul
road by road grader after wetting the dust
by water sprinkling. i) Water sprinkling arrangement with pipe
line at coal dump area/loading point.
Monitoring of the air quality by agencies approved by PCB, Assam on monthly basis.
Waste Management
a) Quantity of overburden removal in 2015-16 8.50 Lakh cum.
b) Protective Measures taken for prevention of siltation, erosion and dust generator for waste
material:
Protective measures taken are:
i) Garland drains of 2100 meters are
provided. ii) 3 no. of toe wall/check dams are
constructed between sec. 3312300 to
3312000 with the boulders from the mine to prevent flow of soil mass.
iii) 20 no. of gully plugging are provided to
prevent soil erosion.
15 more no. gully plugging shall be constructed.
iv) Water spraying of 72KL /day is done on
working days to suppress dust on haul roads, working areas and in the coal stock
yard on regular basis with the help of water
tanker of capacity 9000 L .
c) Quantity of Waste material re-handled/back-filled: 6 Lakh cum (approx.)
9) PHOTOGRAPH:
MINE WORKING
COAL DUMP
NEW HAUL ROAD
HAUL ROAD GRADING
WORKING OF TOP OB BENCH
TOP SOIL WORKING
BACK FILLING
COAL TOP EXPOSING
CONTINUOUS WATER SPRAYING
HYDRAULIC EXCAVATOR WORKING
GRADING FACE UNDULATION
FACE WORKING
CONTINUOUS WATER SPRAYING
PLANTATION AT OB DUMP
PLANTATION AT OB DUMP
ABANDONED OB DUMP WITH PLANTATION OF LOCAL SHRUBS
PLANTATION AT OB DUMP
VIEW OF ABANDONED OB DUMP