The Singareni Collieries Company Ltd.

CONCEPTUAL REPORT OF

RAMAKRISHNAPUR SHAFT BLOCK - I

1.0  LOCATION & COMMUNICATION

Ramakrishnapur Shaft Project is located in SRP area of BPA region in Adilabad district, Andhra Pradesh. The proposed block falls almost in the Central part of Somagudem -Indaram coal belt immediately to the East of existing RK-5 Incline and RK-6 Inclines and is bounded by North Latitudes 18052’13” to 18054’54” and East Longitudes 79030’03” to 79032’08” covered by Survey of India Toposheet No. 56N/9 (Location Plan – Plate-I).

The nearest rail head is Mancherial station on the Kazipet – Ballarsha line of the South Central Railway and is 6 kms due west of the block. The Mancherial – Chennuru all weathered metalled road lies at a distance of 4 km to the southern boundary of the proposed block and in turn is connected by the coal transport road, which joins Hyderabad – Nagpur branch road of Highway No.7 south of Mancherial Railway station. The area is also well connected to Hyderabad, the State Capital which is about 270 kms and Adilabad, the district headquarters which is 200 kms. away from the block.

2.0  FEATURES WITHIN THE BLOCK AREA

2.1  PHYSIOGRAPHY

The block area is of a plain terrain varying in elevation from 161.46m (BH.No.RK-327) to 188.87m (BH.No.RK-357) above MSL with a slope of 5.9m/km towards southeast.

2.2  LAND USE PATTERN

Almost entire area of the block is covered by indaram Reserve Forest, except small patch on the northern part which is open scrub. Kundaram Reserve Forest is on the North-eastern and eastern side and a small patch of Rali Reserve Forest on the West-Northwestern side of the block.

2.3  LAND DETAILS

Part of the mine take area is covered under lease hold area of North Godavari Mining Lease, Indaram Mining Lease, and proposed indaram extension mining lease(Plate No-I).

i) Total mine take area : 588.67Ha.

a) Forest land : 550.75 Ha.

b) Non-forest land : 37.92 Ha.

3.0  MINE BOUNDARIES

The boundaries of the Ramakrishnapur Shaft-1 Project are as follows:

1 / North-west (Rise side) / Fault F2-F2, RK-5, MK-4
2 / South-west / Fault F2-F2, RK-6
3 / South-east / Fault F3-F3, RK-6
4 / North-east (Dip side) / Fault F7-F7

4.0  GEOLOGY OF RAMAKRISHNAPUR SHAFT BLOCK-I

The proposed Ramakrishnapur Shaft Project is located in the central part of the Somagudem – Madaram - Ramakrishnapur-Indaram coal belt and falls in the North-Godavari lease hold forming geologically an integral part of it. MK-4, RK-5 and RK-6 Inclines are situated in the close proximity (i.e., to the west) on the rise side of the block. I, IA, IIB, IIA, II, III, IV and V seams are being exploited from these mines with conventional Bord & Pillar method.

The proposed Ramakrishnapur Shaft Project lies in the dip side of RK-5 and RK-6 Inclines and separated by a boundary fault F2-F2.

The geology of this area is well established and all the coal seams in the region are correlatable. The proposed block covers an area of 5.88 sq.kms with 5.7 kms along strike and 1.2 kms along dip direction. There are 46 boreholes drilled over Ramakrishnapur shaft property with the borehole density of 7.8.

a) Seams present : Eight seams : I, II, IIIB, IIIA, III, IV, V and VI

b) Seams assessed : four seams: I, II, IIIA, and III

c) Seams workable : three seams viz. I, II, and III

Structure

The general trend of the beds is N300E with east-northeasterly dips. The gradient of the coal seams varying from 1 in 3.0 to 1 in 4.5. There are 6 faults having a throw range of 8m to 170m. Four of them are strike faults and two are of oblique in nature.

5.0  DESCRIPTION OF SEAMS

There are 8 correlatable seams present in this block out of which assessment is done for four seams and I, II, & III seams are considered for extraction with Longwall technology in the block.

5.1  DETAILS OF ASSESSED COAL SEAMS

Seam / usual
Thickness
( m) / Parting(m) / Quality
Min / Max / UHV
K.Cal/kg. / Grade
I / 4.50 / 2166-3562 / F
10.34 / 18.29
II / 3.00 / 2235-4605 / E
34.14 / 42.03
IIIB / 0.50 / 3486-5154 / E-C
6.54 / 10.18
IIIA / 1.20 / 3247-5575 / D
23.77 / 34.77
III / 3.50 / 3076-5307 / F-C
31.39 / 38.68
IV / 0.90 / 4829 / D
7.0 / 12.96
V / 1.20 / 4291-4953 / C-D
6.72 / 14.92
VI / 0.90 / 4663 / D

Out of the above seams, the following seams were not considered for extraction:

Seam IIIB is not considered for extraction because of lesser thickness of 0.77 m.

Seam IIIA is not considered, since out of 36 boreholes drilled, coal is encountered in 18 boreholes only and average seam thickness is about 1.3m (Not consistent though out block).

Seam IV is not considered for extraction because of lesser thickness of 0.95 m.

Seam V is not considered for extraction because of lesser thickness of 1.18 m.

Seam VI is not considered for extraction because of lesser thickness of 0.84 m.

6.0  RESERVES IN WORKABLE SEAMS

Seams / Depth(m) / Usual
Thickness (m) / Selected
Height of
Extraction(m) / Geological Reserves (MT) / Extractable Reserves (MT) / UHV (K.cal/kg) / Grade
Min / Max.
I / 129 / 471 / 4.50 / 3.5
along floor / 41.398 / 15.966 / 2741 / F
II / 148 / 483 / 3.00 / 2.5
along floor / 30.501 / 11.337 / 4111 / E
III / 226 / 573 / 3.50 / 3.0
along floor / 32.510 / 12.541 / 4292 / D
Total / 104.409 / 39.844

7.0  EXTRACTABLE RESERVES

In the block under reference, the reserves are considered for the Seams I, II, and III. The total proved reserves for the In-band thickness of the above sector of the workable seams amounts to 104.409 MT. The extractable reserves are about 39.84 million tones. The coal grades of I seam, II seam and III seam are grades F, E, and D respectively.

8.0  GEO-ENGINEERING DATA

The physico-mechanical properties determined on the cores of the boreholes and the RQD data indicate that the roof rock in general can be considered as moderately strong. The range of compressive strength being 70 Kg/Sq.cm to 457 Kg/Sq.cm.

9.0  NATURE OF ROOF & FLOOR OF WORKABLE SEAMS

Seam / Compressive
Strength of
roof strata
(Kg/sq cm) / Nature of Roof/Floor
Roof / Floor
I / 70-212 / Mostly sandstone / Mostly sandstone
II / 87-316 / Carb.clays and sand stone / Sandstones,Carb.clays,sandy shales.
III / 88-457 / Mostly sandstones, sandy shales, carb clays, carb shales. / Mostly sandstones and sandy shales

10.0  METHOD OF WORK

It is proposed to extract all the three seams viz., I,II and III by mechanized Longwall retreating method with caving as this is the most appropriate choice for mining thick as well as thin seams, especially at higher depth. Longwall mining provides concentrated working, high production capacity, higher percentage of extraction and higher standards of safety.

However to prove undisturbed property for planning of Longwalls shall be confirmed by drilling additional number of exploratory boreholes(to improve borehole density from 7.8 to 20).

Four Roadheaders are proposed–two for gate roads and two for trunk development along with two SDL’s for interconnection. The odd patches which cannot be extracted by Longwall will be extracted by 4 Nos of SDLs.

11.0  MODE OF ENTRY

Two tunnels are proposed from surface to No. III seam for coal transport, haulage and ventilation. Further two additional shafts are proposed from surface to III seam for men transport, light material transport and ventilation. Chair lift system of manriding is proposed for longwall panels and odd patch extraction.

11.1 Coal Transport

Coal from each seam will be transported directly to surface through trunk belts. On surface, a bunker of 2000T is proposed. Three Nos. of 100T mobile Steel bunkers are provided for underground coal storage.

11.2 Ventilation

There will be four entries in all for ventilation i.e. two inclines from surface as intake,

One intake air shaft and one return air shaft, both the shafts connecting upto bottom most seam (III seam).

11.3 Pumping

Water from all the seams would be collected at I seam main sump where 3 Nos of 265 KW x 70 LPS capacity pumps will be located to deal an inflows of around 100LPS to surface.

12.0  PRODUCTION CAPACITY AND TECHNOLOGY

The following equipment is envisaged for the Ramakrishnapur Shaft Project.

i) Longwall : 1 set.

ii) Road headers : 4 Nos. with 2 SDLs for cross connections (upto

9 years, then 2Nos. only)

iii) SDLs : 4 Nos

The production capacity of the project will be about 1.50 Millilon tonnes per year. To achieve this One Longwall unit along with four Road headers (After 9year only two Nos.) and 6 Nos of SDLs including two SDLs for trunk interconnection are envisaged.

13.0  LIFE OF THE PROJECT

The life of the project will be around 29 years including construction period of 2years at a production rate of 1.5Mt per annum.

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Ramakrishnapur shaft Block-1Project

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