The Singareni Collieries Company Ltd.
CONCEPTUAL REPORT OF RAMPUR SHAFT BLOCK
1.0
LOCATION
Rampuram Shaft Project is located in the Khammam district of Andhra
Pradesh. It is situated in Southern side of existing VK-7 incline mine of
Kothagudem area.
The Geological Block covering an area of 9 sq.km bounded by latitude 17 0
24’ 45”N to 170 25’ 22”N and Longitude 800 40’ 29”E to 800 42’ 20”E and
falls in Survey of India Topo sheet No. 65 C/11.
2.0 COMMUNICATION
Rampuram Geological Block is well connected by Rail and road. The
Bhadrachalam Road Railway station is about 15 Km and Rudrampur Coal
handling plant is about 6 Km. The state capital Hyderabad is connected by
road and rail (320 km)
3.0
3.1
FEATURES WITH IN THE 10 Km. RADIUS OF THE BLOCK
PHYSIOGRAPHY
The central part of the plain area consists of fragments of pediment due to
active erosion. In the eastern side the plains are undulatory dotted with
hillocks and sandy patches, which are imperfectly drained. The north-south
trending hill ranges forming the drainage divide between Murreru and
Pamuleru sub-basins are of beveled cuesta type.
The topographic
elevations of the plains in the central portion vary from 100 m above MSL to
180 m above MSL with a slope of 10.5 m per Km. towards north northwest,
while the adjoining hill ranges are of 328m above MSL to 431m MSL (Balusu
Gutta 328 m, Kanigiri Gutta 431 m etc.,)
4.0. LAND USE PATTERN
Out of the total block area of 9.0 Sq. Km about 6.4 Sq Km is covered by the
Penagugapa reserved forest. The remaining area of 2.6 Sq km is Revenue
land where Paddy is cultivated.
Gautham Khani opencast project, VenkateshKhani-7 incline, 5 Group
of Mines viz 5 incline, 5B incline and Padmavathi Khani mines are situated
in the northwestern and western side of this block. The SCCL has also
established VK-workshop, sawmill, coal-handling plants etc., for supporting
its mining requirements.
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The Singareni Collieries Company Ltd.
The approach to coal seams in this project is by three Shafts and one
long Tunnel. The entrance of Tunnel falls outside the Block boundary.
Therefore, the Rampuram Shaft Project covers, an area of 9.71 Sq. km, with
total geological reserves of 111.119 Mt and Extractable Reserves of
39.70Mt. The scope of this Project is to work five coal horizons of Queen
Seam, King seam and Index seam with a rated capacity of 1.575 Mt per
annum.
5.0
MINE BOUNDARIES
a. East: A line drawn at a distance 200 m from BH No SR-46
b. West: Fault F8-F8
c. South side: A line drawn at a distance of 200 m away from BH SR-35
d. North side: Fault F1-F1
7.0
GEOLOGY
7.1
General Information and Structure Of Rampuram Shaft Block
The proposed Rampuram Shaft Project is carved out of Rampuram
Geological block of Kothagudem area. Total about 77 boreholes with the
cumulative meterage of 40547.05 has been considered for the assessment,
out of which 64 are with in the block & 13 are out side the block. The
borehole density is 7 BH/ Sq km. The coal seams in Rampuram Shaft
Project trend NNW – SSE with dips towards ENE.
The gradient of the
seams varies from 1 in 6.5 to 1 in 18.3. The entire Rampuram Shaft Project
block is virgin.
7.2.
Geo-Engineering Properties
Strength properties of roof and floor rocks of different coal seams were
analysed.
The cores were analyzed for different parameters such as
Density, Compressive strength, Tensile strength, Shear strength, Young’s
Modulus and Impact strength Index. The range of compressive strength
varies from 79 to 351 kg/cm2.
7.3.
Cavability assessment
The caving Index parameters for overlying roof rocks of, Q3, King Seam
(Top and Bottom sections) and Index Seam are estimated. It is inferred
based on the caving Index values of the overlying strata of the workable
seams that the roof stratum of Q3 and King Seam (Top) is difficult in caving.
Whereas, the roof of King seam (Bottom) is “Easily cavable”.
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The Singareni Collieries Company Ltd.
7.4.
Hardness of coal
The compressive strength of coal in these coal seams in Rampuram Shaft
Project is around 325 kg/cm2
7.5.
Structure
The general trend of coal seams is in a North-North East – South- South
West (NNE-SSW) with dips towards East – South East (E-SE). General
gradient ranges from 1.7 to 18.5. A total of 8 normal faults have been
deciphered with throws ranging from 5m to 250m.
7.6.
Gassiness
All the seams of Kothagudem area have been classified as Gassiness
Degree-I.
7.7.
Spontaneous combustion
The seams of the neighboring mines viz., VK 7, PVK 5 Incline are liable to
spontaneous combustion. Based on neighboring mines, the incubation
period of 12 months is considered for all calculations.
7.8.
Make of water
The make of water in the neighboring mines viz.; VK 7, PVK 5 Incline is
around 1750 Gallon per Minute and additional water flow during stowing
operation is assessed around 2200 GPM. Therefore, the make of water has
been assessed as 280Ltrs/sec at planning stage.
8.0
DESCRIPTION OF COAL SEAMS
Out of 64 boreholes drilled with in the block, coal seams were intersected in
61 boreholes. The detailed exploration reveals the presence of No. I Seam
in Kamthi Formation and three coal seams viz. Queen Seam (4 Sections);
King Seam (3 Sections / Combined) and Index Seam in Barakar Formation
in descending order.
8.1.
I SEAM
This is the top most seam and is represented by shale/ carbonaceous shale
with shaly coal/coal bands. The thickness varies from 13.20m to 26.43m.
Keeping in view the poor quality, the seam is not considered for
assessment.
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The Singareni Collieries Company Ltd.
8.2.
QUEEN
SEAM
This seam is developed into 4 sections viz; Q-1, Q-2, Q-3 & Q-4 in
ascending order and underlain by King seam with a parting thickness
ranging
from
(between
35.00m.Sections
Q-2
King
and
Seam
Q-4
and
have
Section
not
Q-1)
attained
8.56m
to
workable
thickness/deteriorated in most of the boreholes & Q-1 section attained
workable thickness only in 8 bore holes which are located in patches and
hence these sections are not considered for extraction. The thickness of
section Q-3 is ranging from 1.5 to 2.0 m in 21 bore holes only in patches.
8.3.
KING SEAM
This is the most persistent Seam occurring above Index Seam with a parting
thickness of 3.50 m to 15.78 m. The Seam is split into three sections, in the
northern and southern part of the block. In the central part of the block the
three sections are merged with each other and becomes a combined seam.
Towards north, the combined King seam is split into two sections. The
thickness of Top, Middle and Bottom Sections of King Seam reduces
gradually towards the south. Its thickness becomes unworkable and not
developed beyond the block boundaries
8.4.
INDEX SEAM
This is the lower most coal seams occurring 10.70 m. to 30.00 m. above
Barakar / Talchir formational contact. The seam attained workable thickness
of above 1.50 m in 12 bore holes only, in the southern part of the block.
Hence, this seam is considered suitable for extraction in the southern part of
the block.
9.0
RESERVES OF WORKABLE SEAM/ SECTIONS IN THE BLOCK
Q-1 section has attained workable thickness only in 8 bore holes
which are located in isolated patches and hence this Section is not
considered for extraction. Hence, the reserves of Q1 seams are not
considered for extraction.
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The Singareni Collieries Company Ltd.
The details of reserves of workable seams/ sections are presented below.
Seam
Geological
Reserves(Mt)
Mineable
Extractable
Reserves (Mt) reserves
Grade
(Mt)
QUEEN(Q3)
15.177
7.85
4.65
E
KING
86.126
67.56
32.21
C
INDEX
10.316
4.63
2.84
D
111.619
80.05
39.70
Total
The total extractable reserves in Rampuram Shaft Project are around 39.70
Mt.
9.1.
S No
Depth and working thickness of workable seams/ sections
Depth (m)
Seam/
sections
Range of working thickness
Min
Max
(m)
1
Q3 Section
337.00
524.00
1.5-2.0
2
King Top
414.60
561.06
1.5-4.6
3
King Middle
419.80
569.50
1.5-4.6
4
King Bottom
427.20
574.70
1.5-4.6
5
Index
410.20
585.20
2.0
10.
MODE OF ENTRIES
It is proposed to approach the seams by three Shafts (Two as Upcast and
one as Downcast) and One Long Tunnel to be used for coal evacuation and
Heavy Material transport from surface. Downcast and Upcast Shaft No 1 will
sunk from surface to King Seam Bottom Section intersecting Q3 Section,
King seam Top & Middle section and UpcastShaft-2 will be sunk up to King
seam Top section intersecting Q3 section of Queen seam to meet the
ventilation requirement.
10.1
MINE VENTILATION
Ventilation requirement of the Project is estimated at 260 cum/sec when all
the Four Continuous Miners are in operation. Two mechanical ventilators of
3.0m dia with a motor power of 300 KW & 225KW respectively have been
envisaged to meet the ventilation requirement. The operating pressure of the
main mechanical ventilator will be 90 mm & 85 mm water gauge
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The Singareni Collieries Company Ltd.
respectively.
A standby fan of similar capacity is also envisaged.
Two
Upcast shafts of 6.5m dia each and of depth 485m & 400m respectively
have been envisaged. Upcast shaft -1 will be sunk up to king seam Bottom
section and Upcast shaft-2 will be sunk up to King Seam Top section.
10.2
PUMPING AND DRAINAGE
The capacity of main sump is designed to hold 16000 Cum. The inflow rate
is estimated to be 280 LPS when the mine is in stowing operation. As the
installed pumping capacity is 304 LPS (Two stand by pumps additional),
which exceeds the inflow rate, the capacity of sump is considered to be
adequate. As 10 pump sets have to be erected, the sump would be
designed in such a way that these pumps could be erected at least at two
locations for free movement.
11.
PRODUCTION CAPACITY AND TECHNOLOGY
Bord and Pillar Method by continuous miner in conjunction with
sand stowing is considered for development of trunk roadways, development
and depillaring of panels in all the seams due to irregular nature of
deposition of seams and variations in thickness in all the seams in the entire
property, less parting between sections of king seam and Geo-Mining
Parameters at Rampuram shaft project.
To achieve the targeted capacity of 1.575 Mt, it is proposed to deploy
Four Continuous Miners in five working horizons of three seams i.e. Queen,
King and Index seam. Out of four Continuous Miners one Continuous Miner
will be of 1.5 to 3.0m cutting height and another Continuous Miners will be of
2.0 to 4.6m cutting height.
12
LIFE OF THE PROJECT
The resultant phasing will have a maximum of Four Continuous Miners in
operation.
First Continuous Miner will be commissioned in 4th year and
remaining three Continuous Miners will be commissioned in 5 th year. Four
Continuous Miners will be working up to 26th year and there after 2
Continuous Miners will be working up to 31st years.
Thereafter, one
Continuous Miners will be working till the end of the life the Mine i.e. 35
years.
***
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