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CMPDI
Job No. 701119 Chapter – 1, Page -
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CHAPTER 1
INTRODUCTION 1.1 PREAMBLE 1.1.1. INTRODUCTION
The Naini coal block is a Non CIL block, located in the North Central part of
Talcher Coalfield in the state of Odisha (Plate no.I) This coalfield is the south-
eastern extremity of the Lower Gondwana basins within Mahanadi Valley
graben. The coalfield occupies an area of about 1800 sq. km with potential
coal bearing area of about 1000 sq. km. It is located between Latitude
20o53’00” to 21o12’00” North and Longitude 84o20’00” to 85o23’00” East.
Major part of the coalfield falls in Angul district and remaining part is
spreading over neighbouring districts of Dhenkanal, Deogarh and Sambalpur
within the state of Odisha. Talcher coalfield being one of the largest store
house of power grade coal in India plays a major role in the socio-economic
development of the Odisha state as well as of the nation.
The exploration carried out by different agencies, viz. Geological Survey of
India (GSI), Indian Bureau of Mines (IBM), erstwhile National Coal
Development Corporation (NCDC), Central Mine Planning & Design Institute
Limited (CMPDIL), erstwhile Directorate of Geology and Mines (DGM),
Odisha and Mineral Exploration Corporation Limited (MECL), established the
largest reserves of coal in Talcher coalfield amongst all the coalfields of India.
The recent assessment of coal reserves by GSI (Inventory of Geological
reserves of Indian coal, as on 01.04.2011) on the basis of resources
estimated by CMPDI, MECL, GSI and DG (O). reveals that out of total non-
coking coals of 285862.21 million tonnes available in Gondwana coalfields
upto a depth of 1200 metres in India, Talcher coalfield alone possesses the
coal reserves to the extent of 46642.39 million tones. Out of this, 16434.17
million tonnes fall under "Proved" category occurring within 600 metres
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depth. The coalfield assumes importance due to occurrence of thick coal
seams at comparatively shallow depth over large aerial extent with low dip of
the strata. Such characteristics have resulted in good quarriable potentiality of
coal over large area within the coalfield.
The occurrence of economically minable coal seams has been well known in
the south-eastern part of the coalfield for over a century. In the recent past,
the investigation carried out by the GSI, MECL, DG (O) and CMPDI have
revealed the occurrence of thick quarriable coal seams in the northern and
south-central part of the coalfield as well.
There has been a phenomenal increase in coal production from coalfields in
Odisha i.e. Talcher and Ib Valley coalfields. The production of coal from these
coalfields rose from 2 million tonnes in 1982 to 15.33 million tonnes during the
first year of inception of Mahanadi Coalfields Limited (MCL) in 1992-1993 and
further grew to 44.89 million tonnes during 2000-2001 and 102.07 million
tonnes during 2010-2011 out of which Talcher coalfield has contributed 59.74
million tonnes. For he terminal year of XI plan, i.e. 2011-12, the total
production from MCL is projected at 106 mt out of which the contribution of
Talcher coalfield will be around 68 mt. Further, during the 12th 5 year plan, i.e.
till 2016-17, the total production from MCL is projected at 180 mt out of which
127 mt is likely to be contributed by Talcher coalfield.
The occurrence of coal seams in Naini coal block has been established in
accordance with that of established in adjacent blocks viz. Baitarni West &
East, in the West and Chhendipada-I towards the north of the block. Seam –
II to Seam XVII occurring in Barakar Formation and seam – I with 9 splits
occur in Karharbari Formation and are considered potential for quarriable
prospect.
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Based on 46 nos. of CMBT series (funded by MCL) and 4 nos. of CMNI
series of boreholes (total 50 bh’s), a report entitled “Basic Exploration Data of
Naini block, Talcher coalfield, district Angul, Orissa”, was submitted in August
2006.
GSI has carried out regional exploration in Chhendipada central block,
Talcher coalfield, Orissa during 1985-1990. 8 nos. of GSI boreholes are also
falling within the Naini coal block.
The correlation of coal seams in Naini coal block has been established in
accordance with that of established in adjacent blocks viz, Chhendipada-I in
the north and Baitarni west. block next to Baitarni East block in the west.
Seam II Bottom to XVII occur in Barakar Formation and Seam-I with ten splits
occurring in Karharbari Formation are considered potential for quarriable
prospect.
Apart from the 58 boreholes drilled within the block, the boreholes drilled
adjacent to Naini coal block i.e. Chhendipada-I and Baitarni East /
Chhendipada OCP block have also been taken into consideration for the
preparation of the geological plans.
1.1.2. BACKGROUND
The exploration in Naini coal block was carried out in phases during the
period from 1981 to 1998 by GSI and CMPDIL. The drilling was concentrated
in the Western part of the block only. 53 nos. of boreholes have been drilled
in the western part of the block spreading over 3.42 sq.km area which has
been considered as Proved zone for resource estimations. The remaining
eastern part of the block comprising 5.70 sq km area is regionally explored.
The block is mostly under forest cover and could not be drilled in detail.
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The Ministry of Coal, Govt. of India vide letter no.13016/2007-CA-1 dated
25.7.2007 had allocated Naini coal Block in Talcher coalfield (Orissa) jointly to
Gujarat Mineral Development Corporation Ltd., (GMDC) of Govt. of Gujarat
and Pondichery Industrial Promotion Development & Investment Corporation
Ltd., (PIPDICL) of Govt. of Puduchery.
To develop the block, GMDC of Govt. of Gujarat and PIPDICL of Govt. of
Puduchery had incorporated a joint venture company under the name and
style of “Naini Coal Company Limited (NCCL) on 8.10,1009 with 50:50 equity
share.
As mentioned the status of the Naini coal block at the time of allocation is
narrated below:
• Regional exploration was carried out by GSI during 1985-90 in the region
and in the vicinity of Naini block.
• Earlier CMPDIL carried out exploration during 1991-98 with 50 nos. Of
boreholes.
• The borehole density in the total block with GSI & CMPDI is about 6
boreholes per sq. km.
The coal resources of Naini coal block will be used for 1500 MW proposed
power plant at Angul in Odisha or near Dumka in Jharkhand by GMDC and
proposed pit head power plant of 1500- 2000 MW capacity by PIPDIC.
M/s Naini Coal Company Ltd., vide office letter no.NCCL/CMPDI/2010/1 did.
25th August 210 requested CMPDI for preparation of geological report for Naini
coal project Talcher coalfield. Accordingly CMPDIL vide letter no. CMPDI/BD/A
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(003) offer-BH XV/6011 dated 30.9.2010 submitted it’s offer consisting of the
scope of services, time schedule, consultancy & other terms and conditions. With
reference to CMPDI offer dated 30.9.2010 and 19.10.2010, M/s Naini Coal
Company Ltd. vide letter no. NCCL/CMPDIL/1/2010/499 dated 29th January 2011
placed work order with Central Mine Planning and Design Institute Limited for
preparation of Geological Report (GR) for the whole Naini coal block, Talcher
coalfield with a request that copy of the exploration data of GSI would be sent to
CMPDI shortly.
Hence, it would be worth to mention that:
1. Detail exploration has not been carried out in Naini coal block.
2. CMPDI has drilled 50 nos. of boreholes towards western part of the
block concentrating only within an area of around 3 sq.km.
3. The GSI has drilled 8 boreholes within the block covering an area of
9.12 sq. km.
4. Eastern part of the block covering an area of about 6 sq.km has only 5
GSI boreholes and needs the detail exploration to assess the
structure, lay & disposition of coal seam in that part of the block.
5. The coal seam XVII to IX occur only towards the southern part of the
block below fault F1-F1 over a small area.
6. The coal seams-VI/VII/VIII, Seam-III (with its splits) and Seam-I (with it’s
ten splits) are the main coal seam of the block.
The present report incorporate the finding of the 58 boreholes (including 8
GSI BH.) covering an area of 9.12 sq.km.
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1.1.3. OBJECTIVE
The broad objectives of the present report are as follows:-
i) Preparation of a geological report after proper delineation of lay and
disposition of coal seams, incrop, and structure and quality
assessment with the help of borehole data drilled inside the blocks.
ii) Incorporation of the analytical data of all the additional boreholes
drilled and compilation of quality of all the boreholes drilled inside the
block.
iii) Estimation and compilation of reserves for all the coal seam from
Seam XVII to I H which have got opencast potentiality to meet the coal
demands for the proposed power plants.
1.2 LOCATION AND LIMITS
The Naini coal block is located in the North central part of the Talcher
coalfield in Odisha state (Plate no.I). It spans over an area of 9.12 sq. km
between Latitude 20o48’7”& 21o7’7” North and Longitude 84o52’56” & 84o53’6”
East. The block is covered under Survey of India Toposheet No.73 C/16 on
R.F. 1:50000 and special toposheet nos. L-11 and M-11 on the RF 1:10000
and falls within Angul district of Odisha.
The limits of Naini coal block is given below:
Boundary Limit
East Western boundary of Bankhui block.
West Eastern boundary of Baitarani East block / State Highway-SH-63- Metalled road from Angul-Chhendipada-Rengali.
North Southern boundary of Gauduni Nalla
South An arbitrary East- West line passing below the Thalliposi village
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The limits of Naini coal block in terms of cardinal points is given below:
Boundary
Cardinal Points Limit
A NORTH-WEST-
X (-) 27336.1363
Y 16143.4904
North-Western corner of the block.
B NORTH-EAST-
X (-) 24245.2173
Y 17563.2217
North-Eastern corner of the block.
C SOUTH-EAST-
X (-) 23287.4903
Y 14626.846
South-Eastern corner of the block.
D SOUTH-WEST
X (-) 26963.3011
Y 13924.8318
South-Western corner of the block.
1.3 COMMUNICATION AND ACCESSIBILITY
District headquarter Angul, located on the National Highway 42
(Bhubaneswar-Cuttack-Angul to Sambalpur), is the nearest town at a
distance of about 33 km from the south-western corner of the block via state
highway 63. -the Angul-Chhendipada-Rengali metalled road which passes
from the south-western corner of the block connecting the north western
corner and forms the western boundary of the block. There is a Block
Development as well as Tahsil office at Chhendipada village, which is located
about 2 kms from the north-western boundary of the block). The block comes
under Chhendipada Tahsil and police station in the district of Angul, Odisha.
The village Kosala, where the Exploration Camp of CMPDI, RI-7 is located,
lies about 10 kms. South of the block. The MCL Project Office of
Chhendipada OCP is situated in the adjacent Baitarani East block. Talcher
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town having MCL establishments both for opencast as well as under ground
mine is located at a distance of 40 km from the block via Kosala village. The
Kaniah Super Thermal Power Station of NTPC is about 25 km towards the
north east of the block and connected through fair weather / all weather
roads from Kosala village. A Captive Power Plant and a Smelter Plant of
National Aluminum Corporation are located on either side of National
Highway 42 in Angul township. The nearest railway station is Angul on
Cuttack-Sambalpur line of East-Coast railway and is about35 km from the
block.
The state capital Bhubaneswar is about 160 km from the block and
connected through the state highway 63 upto Angul, then by National
Highway 42 upto Manguli chhuck and thereafter through National Highway 5
via Cuttack. The nearest port Paradip at Bay of Bengal, is situated at a
distance of 220 kms. from the block. The Biju Pattanaik International
Airport, located at the southern end of the state capital Bhubaneswar, is the
nearest aerodrome from the Naini coal block. There is only one village viz.
Thaliposi towards south-eastern part of the block
1.4 AREA OF THE BLOCK
The total area of Naini coal block is 9.12 sq. km. The length of the block is
about 3.6 km along strike (east-west) and about 2.5kms along the dip
direction (south to north).
1.5 PHYSIOGRAPHY AND DRAINAGE
The surface topography is generally rugged and undulating. The Naini coal
block is mostly covered with forest. Most of the part of the block lies under
Chhendipada reserve forest zone. However south eastern part is covered
with open scrub/less dense forest cover. The surface topography is
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undulating with a general northerly slope. The highest elevation above Mean
Sea Level is about 159metres (near the borehole CMBT-05, RL 158.85
metres) in the southwestern corner and the surface elevation gradually
decreases to 125 metres (near borehole TCC-23, RL 125.09 metres) in the
northeastern and northern part of the block (Plate – II & Fig.2).
Brahmani river, flowing in approximately north-south direction along the
eastern boundary of the Talcher coalfield, provides the main drainage of the
region. The Gauduni nalla forming the northern boundary of the block flows
from south-west to north-east/north. Another Kudaposi nalla flows from south
to north across the Naini coal block. These two nallas-Gauduni and Kudaposi
controls the drainage and topographical pattern of the block.
Both the nalla are discharging in Tikra nadi, which is running along the
northern boundary of the coalfield. The Tikra Nadi merges in its down stream
into Brahmani river towards the northeastern corner of the coalfield.
Small ponds and dug wells are common in this block which are utilised for
irrigation and drinking purpose
The main drainage system of the area/coalfield is controlled by the southerly
flowing Brahamani river passing through eastern extremity of the coalfield
The other seasonal nalas, viz. Tikra nadi, Singhada jhor, Nandira jhor etc.
also fed the Brahamani river.
1.6 CLIMATE, VEGETATION AND HABITAT
The climate is tropical. The summer is severe during May-June when
temperature rises to as high as 49oC accompanied by high humidity. Winter is
very pleasant, prevails during December-January. The temperature recorded
generally varies from 6.7°C to 38.1°C (December to February). Monsoons
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break towards the end of June and continues upto end of October. Relative
humidity varies from 31% in March to 88% in July. Annual rainfall varies
between 758 mm and 1588 mm for a period of 23 years from 1980 to 2003
with annual average rainfall of 1317 mm as recorded by IMD, Angul. More
than 70% rainfall occurs during the months of June to September.
The annual mean wind speed recorded at Angul Station is 2.43 km/hour
whereas the monthly mean wind speed ranges between 2.8 km/hour
(January-February) and 3.02 km/hour (May). During the Pre-monsoon
season, the prominent wind direction remains in east. During the monsoon
season, the wind direction shifts to north-west and north-east. During post
monsoon and winter season, the direction of wind is generally towards north-
west and north-east. During 29th to 31st October ’99 there was a super
cyclone with wind speed upto 300km/hour at costal areas of Odisha. The
reading during super cyclone possibly could not be recorded. Vegetation in
the area are mainly eucalyptus, acasia, palas, sal and aran with some fruit
bearing trees like mango, mahua and neam.
Common wild animals found in the area are elephant, wolf, stripped Hyaena,
Indian Fox, Jackal, Hanuman, Langur, common mongoose squirrel etc. The
main birds found are Indian ring fowl, spur fowl, grey horn bills, blue winged
teel, whistling teal, Indian koel and ring dove etc. Poisonous snakes (cobra,
russels wiper, karait) and non-posisonous snakes (Dhomana, dhanda,
kananali & python) are traced in the area.
Few concentrated growth of Kendu, Sal, Mahua, Mango etc. are also found in
the block.
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1.7 PREVIOUS WORK
Talcher coalfield attracted the attention of geologists date back to 1817 for its
coal potentiality when coal was first reported from the area by Lt. Kitto.
Subsequently, systematic geological mapping of this coalfield was undertaken
by W. T. Blanford, H. F. Blanford and Willium Theobald (Jr) of GSI during the
year 1855-56 which brought to light the Lower Gondwana glaciation in India.
The Public Works Department of the Government in 1875 excavated 80
tonnes of coal by sinking six shafts in Gopalprasad area. L.L. Fermor of GSI
examined the coal exposure near Gopalprasad and made an attempt to
assess the coal potentiality in the area in 1918. M/s Villiers Ltd. took up some
drilling in the eastern part of the coalfield in the early twenties as a result of
which Karharbari coal seams were discovered and mining operation in this
coalfield commenced in 1923, restricting only in the south- eastern part. S.
Krishnaswamy (1941- 1942), M. N. Deekshitulu (1944-1948), B. N. Jayaram
(1950-1951,1953-1956), B. R. N. Murthy and K. S. Subramanian (1954-1955,
1956-1961), all from GSI, surveyed and mapped the parts of the coalfield.
GSI carried out the regional exploration in the central part of the coalfield in
1963-1965 and 1967, while the north and west Nandira sectors were covered
during 1971-1973 and 1971-1975 respectively. They are presently engaged in
northwestern part of the coalfield.
In the late fifties, IBM and erstwhile NCDC undertook detailed exploration by
drilling in the eastern part of the coalfield, which is now under active mining
operation. After NCDC, CMPDI continued detailed exploration in the coalfield,
which is in progress even today.
The DMG (O), at the instance of Central Coalfields Limited and CMPDI,
carried out detailed exploration in Nataraj area in 1966-67 and subsequently
in Gopalprasad at southeastern part and Neelachal area along the northern
boundary of the coalfield.
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In recent past, MECL also carried out detailed exploration in Kaniah area
along the northern part as well as in Nandira, Natraj, Kalinga, Ananta and
Subhadra blocks around south eastern to south central parts of the coalfield
at the instance of CMPDI. They had also carried out deep drilling for
prospecting purpose in and around Radhikapur West block to establish the
extension of coal bearing Barakar Formation below younger Barren Measure
Formation towards central and western parts of the coalfield.
In the northcentral part of the coalfield, a large area occupied by Barakar
Formation remained unexplored in details. Regional exploration activities by
GSI during 1985-1988 indicated the occurrence of thick coal seams at
shallow depth. To demarcate the future blocks for mining of power grade
coals, a larger area comprising of Chhendipada-Naini-Baitarani-Mahanadi
blocks was explored initially from 1991 with scout boreholes (CMBT series)
by CMPDI on the basis of the initial data available from GSI report based on
exploration carried out by them during the period 1985-88 (Geology and coal
resources of Chhendipada- Badagundri Block, Talcher coalfield, Dhenkanal
Dist, Orissa, 1989).
In continuation to the regional exploration for coal in the Chhendipada-
Badagundri block, search for coal by G.S.I. was taken up further west in the
Chhendipada (West)-Patrapara block in 1990-94. After drilling 40 boreholes in
about 50 sq.km. area, the drilling was concluded (Report on Exploration for
coal in Chhendipada (West)-Patrapara block, Talcher coalfield, Angul district,
Orissa-1998). Towards the end of above spell of GSI drilling (1990-94),
CMPDI, in continuation of its scout drilling spell from 1991 onward, also drilled
50 boreholes (CMBT & CMNI series) towards the western part of the Naini
block, hitherto a part of the larger Chhendipada-Naini-Baitarani-Mahanadi
blocks. Subsequently, during detailed exploration by CMPDI, the area was
subdivided into smaller mining blocks, viz., Chhendipada, Naini, Baitarani and
Mahanadi block.
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Due to change in policy laid down by the Government, the drilling operations
in other blocks except for Chhendipada were discontinued temporarily since
these blocks were identified as non-CIL blocks. Thus different blocks of
Talcher coalfield have been explored by various agencies like IBM, GSI,
NCDC, MECL, DG(O) and CMPDIL. With the concerted effort made by
various exploration agencies, a total reserves of 46642.39 million tones
having 16434.17 million tonnes in proved category have been estimated as
on 01.04.2011.
1.8 MINING HISTORY OF THE BLOCK
No mining activity is taking place in the block under report. The nearest mine
is Chhendipada OCP adjacent to the north-western corner of the block.
1.9 EXPLORATION DESIGN
Annual exploration programme are designed every year by CMPDI in
consultation with MCL for this coalfield under the guidance of Ministry of Coal.
The present block was explored in many phases. CMPDI has drilled 50 nos.
of boreholes during the year 1991 to 1998. These boreholes are concentrated
only towards the western part of the block over an area of 3 sq. km, whereas
the remaining 6 sq. km of area has not been explored. However GSI during
1985-1990 has carried out regional exploration in Chhendipada central block
Talcher coalfield, Odisha. Out of the boreholes drilled by GSI, 8 boreholes are
falling within the Naini coal block. The exploration data of these borehole
have been taken into consideration for the structural interpretation of Naini
coal block.. Three master plans of Talcher coalfield have been prepared by
CMPDI in 1986, 1996 and 2009 to formulate the current and advance scheme
and design on exploration, mining and related activities in and around the
coalfield upto 2021-22. The exploration in the present block is carried out
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from 1981 to 1998. The block has not been explored in detail. Only western
half of the block has adequate no. of boreholes whereas remaining eastern
part of about 6 sq. km. is still needs to be explored. The eastern part has five
nos. of GSI boreholes at a distance of about more than one km. in between.
1.10 MPORTANT FEATURES IN THE AREA
Angul town, the district headquarters, is the nearest township and is located
about 28 kms by road south of the block. The nearest mining office
establishment of MCL are located in the north western side of the block is
Chhendipada OCP. Talcher town is located at about 45 kms in the south
east of the block. National Aluminium Company (NALCO) has a smelter plant
and a captive power plant at Angul at a distance of 42 km. south of the block.
National Thermal Power Corporation (NTPC) earstwhile TTPS has a power
plant about 45km south east of the block. The 3000 mega watt NTPC Super
Thermal Power station at Kaniah is about 25 kms north east / east of the
block under report. The only village occurring within the block is Thaliposi
south eastern part of the block.
1.11 RESENT INVESTIGATION
Generation of adequate sub-surface data through exploratory drilling was
essential for geological interpretation as there are practically no exposure
available in the block. The exploration have been undertaken in different
phases since 1981 to 1998 depending upon the availability and
approachability of the proposed drill sites. Initially, the drilling was restricted to
an interval of 400 m to decipher general lay and disposition of the coal
seams, followed by some infilling boreholes as required to substantiate
structural disturbances and incrop proving. About 90% of the total boreholes
have been drilled within the depth range of 200 m to 250 m to encounter
Barakar and Karharbari coal seams. Departmental drills from the nearby
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Kosala camp were deployed for the exploration work. The boreholes were
surveyed with reference to that of nearby South Balanda colliery bench mark.
The coal cores of NQ size were recovered from the boreholes, sub-sampled,
wrapped in polythene sheet, packed in wooden boxes and sent to different
analytical laboratories for band by band and subsequent seam overall and
special test quality assessment as required for power grade coal.
The present exercise involves the findings based on the 58 nos. of boreholes
drilled within the block and some of the boreholes drilled in adjoining blocks
for which geological reports have already been prepared / to be prepared.
The duration and quantum of exploration activities by CMPDI and subsequent
laboratory tests in the Naini coal block are listed in Table – 1.11 A below:
Table – 1.11 A
Duration and Quantum of Exploration Activities by CMPDI in Naini coal block,
Talcher Coalfield
CMPDI
Duration
Sl.
No.
Activity
From To
Quantum
1. Reconnaissance/Data
collection
1981
1998
Data collection of findings of
GSI by regional drilling as well
as exploratory drilling by CMPDI
in adjoining blocks.
2. Mobilisation August
1991
July
1998
Complete exploration (Through
CMPDI exploration camp
Kosala)
3. a) Topographical survey
by Survey of India
- - Survey of India Toposheet
No.73D/16 available on RF
1:50,000 (Area 9.12 sq.km)and
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CMPDI
Duration
Sl.
No.
Activity
From To
Quantum
special toposheet nos. L-11&
M-11 on RF 1:10000
b. Borehole survey `1991
1995
1998
1993
1996
1998
CMPDI - 50 boreholes within
the block.
4. Geological mapping - - Not done as area is covered by
thick blanket of soil and forest..
5. Surface geophysical
survey
- - Not done
6. Remote sensing - - Not done
7. Drilling 1991 1998 9538.60m from 50 boreholes.
(Out of total 58 boreholes)
8. Geological logging 1991 1998 50 boreholes (9538.60m)
9. Sampling/Packing 1991 1998 50 BHs for band by band and
overall analysis.
10. Geophysical logging 1991 1996 7 BHs-CMBT-1,3,4,33,124,131
& 135 involving 1257.30 m
11. Hydrogeological studies - - Not done. Needs to be done in
the block. However 600 sq. km
of area already covered in the
eastern part of Talcher coalfield.
Hydrogeological studies in the
nearby Baitarini west and
Machhakutta has also been
conducted.
12. Coal Analysis 1991 1998 a) Band by band analysis (M%
and A%) = 50 BHs
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CMPDI
Duration
Sl.
No.
Activity
From To
Quantum
b) Seam overall =19 boreholes
c) GCV = 5 BHs
d) HGI = 4 BHs
e) UA= 5 BHs
f) AFT= 4 BHs
g) C = 5 BHs
h) P = 5 BHs
i) Ash analysis= 2 BHs.
13. Physico mechanical
studies
- - Not done. It has to be carried
out in future at the time of detail
exploration in the eastern part
the block.
14. Gassiness studies - - Not done
15 Any other tests -
Washability studies
Petrographic studies
--
-
-
-
-
-
Not done. It has to be carried
out in future at the time of detail
exploration in the eastern part
the block.
1.12 QUANTUM OF TOTAL EXPLORATION INPUTS
The total quantum of exploratory drilling for coal carried out in Naini coal block is
provided in the following table in Table 1.12A.& 1.12 B
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Table 1.12A
Boreholes considered in Naini coal block and adjoining blocks for report
preparation
Agency Series of
Borehole
Naini
coal
block
Baitarini
East
block*
Chhendi
pada
block*
Total
CMBT 46 15 19 80 CMPDI
CMNI 4 - 4
GSI TCW
&
TCC
8 2 1 11
Total 58 17 20 95
Note: * The borehole data of these adjacent blocks have been considered for the
present report preparation.
Table – 1.12B
Agency wise boreholes drilled in Naini coal Block,
Talcher Coalfield
Meterage drilled Sl.No. Agency Period
Of
drilling
No. of
Borehole
Meterage
Type of
Exploration
Status of
documentati
on
1. CMPDI 1991 to
1998
50
(CMBT
series&
CMNI
series)
9538.60
Adequate
Exploration
only in
western part
of the block.
Rest of the
block is
regionally
*Present
report
Incorporates
the data of 58
boreholes
(50 BH of
CMPDIL &
8 BH of GSI)
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Job No. 701119 Chapter – 1, Page -
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Meterage drilled Sl.No. Agency Period
Of
drilling
No. of
Borehole
Meterage
Type of
Exploration
Status of
documentati
on
explored
2. GSI 1981
To
1990
8
(TCW
&
TCC
series)
2764.28
Total 58 12302.88
Present
Report
The source of funding for the meterage drilled in Naini coal block is through MCL for
CMBT series of boreles and through MOC for CMNI series of boreholes.
1.13 SCOPE AND LIMITATIONS
1.13.1 SCOPE
The scope of the present report involves:
i) Processing and interpretation of basic data of 58 boreholes drilled
within the block.
ii) Merging of the data of 52 boreholes available in the report entitled,
Basic exploration data of Naini block Talcher coalfield, 2006 by CMPDI
along with the basic data of 8 GSI boreholes.
iii) Processing and interpretation of basic data of 45 boreholes drilled in
adjoining Chhendipada – I & Baitarani East blocks.
iv) Uniform seam correlation and geological structure vis-à-vis adjacent
blocks.
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Job No. 701119 Chapter – 1, Page -
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v) Preparation of incrop, topographical, floor contour, seam folio, iso-
parting and allied plans for the block matching with the adjacent
blocks.
vi) Estimation and compilation of quality, reserves and overburden.
vii) Documentation based on the guidelines provided by CMPDI, HQ, in
the form of Model Geological Report including subsequent modified
instructions, to the extent possible, in 3 parts viz, Text, Annexures and
Plates.
1.13.2 LIMITATIONS
i) The correlation of coal seams including splits and local bands have been
made in accordance with the documented geological reports of the
adjacent blocks, to the extent possible. However, each split has been
taken/considered as an individual coal seam for structural interpretation
and reserve estimation.
ii) The high flood level for Gauduni nalla is not available.
iii) The concentration of the boreholes are limited only towards the western
part of the block over an area of about 3 sq. km. The remaining area of
about 6 sq.km. towards eastern part of the block is devoid of any
boreholes except 5 nos. of GSI boreholes. Viz. TCC-11,13,15,16 & 23.
iv) The borehole density for the entire block is around 6 boreholes per sq.
Km which is very less and not adequate for structural interpretation and
evaluation / assessment of the reserve / resources / economic viability of
the block.
v) Geological / structural interpretation has been done only for the western
part of the block on the basis of 53 nos. of boreholes over an area of
about 3.42 sq.km. with a borehole density of about 16 boreholes per
sq.km in that part of the block.
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Job No. 701119 Chapter – 1, Page -
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vi) The structure interpreted in the western part of the block has been
extended towards the regionally explored eastern part of the block which
have a borehole density of less than 1 borehole per sq. km. This
structure may change drastically after the detailed exploration carried out
in the block and accordingly reserve estimation may also bound to
change.
vii) Some boreholes are required to drill to prove the position of faults as well
as of coal seams incrop precisely. While interpreting the data of recently
drilled boreholes, some changes in the alignment of seam incrop and
geological structure are observed. This has helped to improve and justify
the incrop and structure more rationally.
viii) The block is mostly covered with forest, hence has not been drilled in
detail. Only some boreholes have been drilled in phases depending upon
the approachability and accessibility of the area.
ix) The geophysical logging carried out in 7 boreholes was matched with the
geological log to the extent possible.
x) The present status of exploration is not adequate enough to ascertain
the lay and disposition of the coal seams and resource estimation
precisely.
xi) Soil and weathered mantle’s chemical analysis have not been done..
xii) Delineation of seam / sections could not be done precisely during
exploration due to wide variation in merging and splitting nature of seam /
sections. As a result, the seam overall analysis carried out on seam
samples in some cases do not exactly tallies with the correlated seam /
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Job No. 701119 Chapter – 1, Page -
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sections during report finalization stage, and thus, could not be used in
quality assessment. However, the same has been included in Annexure VI
– B.
xiii) Hydrological studies for the block have not been carried out.
xiv) Washability test and Physico-mechanical test on borehole core
samples have not been done for the block.
xv) Quality data / special test analysis of coal seams are not adequate for
the Naini coal block.
xvi) Petrographic studies for the block have not been carried out.
xvii) Physico-mechanical studies for the block have not been carried out.
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Job No. 701119 Chapter – 1, Page -
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1.14 ACKNOWLEDGEMENT
NAME AND DESIGNATION
S/Shri
BROAD AREA / LEAVEL OF
ASSOCIATION
CMPDI (HQ), RANCHI
A. K. Singh, CMD
A.K. Debnath (CR & D)
For formulating corporate level
objective, sanctioning of resources
and overall monitoring.
CMPDI, RI-VII, Bhubaneswar
A. Singh, R.D.
For proper mobilization of resources,
arranging all round facilities & creating
appropriate work environment and
continuous inspiration throughout the
period from field investigation till
documentation.
CMPDI (HQ), RANCHI
N. Ahmad, GM (Exploration)
Dr .K.V.V.S, Gautum, GM (ES)
Dr. H.K. Mishra, GM (Geology/Lab )
For earmarking the block and
structuring the scope of report,
discussions relating to gainful
deployment of resources, inspiration,
encouragement, over viewing and
valuable technical guidance.
CMPDI, RI-VII, Bhubaneswar
Ashish K. Hota, Sr. Officer (Geology)
Smt. A. Prusty, Sr. Draft-person
D.K. Verma Sr. P.A.
For exploration data entry
For data entry, printing the geological
plans and plates after making
necessary corrections.
For ministerial work
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Job No. 701119 Chapter – 1, Page -
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NAME AND DESIGNATION
S/Shri
BROAD AREA / LEAVEL OF
ASSOCIATION
R Panigrahi Ex. Supdtg.Geophysicist
N. Nagrajan Ex. Supdtg.Geophysicist
R. K. Singh, Sr. Manager,(Geophysics)
N.K.Sharma,Chief Manager (Geophy)
S.Naresh, Sr. Officer (Geophysics)
For carrying out geophysical work-
bore hole logging.
Field work and
Preparation of Geophysical chapter.
FIELD OFFICERS AND STAFFS OF
KOSALA EXPLORATION CAMP
1. Geology
A.K.Mohanty Ex. OIC
Amitava Das Ex. OIC
R.K.Pati Ex. Sr. Geologist
Jagannath Das Ex. Sr. Geologist
2. Drilling
D. Sahoo, Ex-Sr. Manager(Drilling)
A.V. Ramkrishna, Ex-Sr.Manager
(Drilling)
Jaswant Singh Ex. Drillar
3. Survey
L.M.Dongre, Surveyor
Field geological investigation / drilling
operations, topographical & borehole
survey.
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Job No. 701119 Chapter – 1, Page -
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1.15 PERSONNEL ASSOCIATED WITH THE REPORT
NAME AND DESIGNATION
S/Shri
BROAD AREA / LEVEL OF
ASSOCIATION
Tulsi Das Chief Manager (Geology)
M.D. Naik Chief Manager (Geology)
Rajit Ghosh Sr. Officer (Geology)
Preparation and documentation of
Geological Report using
CEMPGEODOC program and
AutoCAD 2010 & MINEX 6.0.5
software,
Alok Sharma, GM / HOD (Exploration) Overall Co-ordination / Technical
guidance and infrastructure support.