NAME OF THE PACAKGE: CONSULTANCY ASSIGNMENT FOR THE
PREPARATION OF FEASIBILITY REPORT FOR NORTH WEST (NW) QUARRY OF PAKRI BARWADIH COAL MINING BLOCK (Bidding document no:
These Salient Technical Features are mentioned only to facilitate the prospective bidders to
Introduction
The Pakri Barwadih Coal Block is located in North Karanpura Coalfields in Hazaribagh district of Jharkhand state. The block has been allocated to NTPC Ltd., for captive mining for supply of coal to their super thermal power stations by Ministry of coal, Government of India vide letter no.
The north western part of PB block exhibits undulating topography with general slope towards south. In general the elevation of ground varies from 430m to 460m above mean sea level.
Drainage
The shape of north western part of the block is triangular. On two sides, block boundary is defined by tributaries of Khora Nala, which discharges its load Lathorwa Nala. The drainage of the block is controlled by Khora Nala, which flows into Lathorwa/Khora Nala which
nala of the block, there are many small Streams & streamlet, which discharge their load into this major nala. All the nalas of the block are seasonal and become dry during summers.
None of the nalas/tributaries were planned for diversion except straightening of Khora Nala – B at NW part of the block. During mining, adequate clearance from high bank of nala are left on the active pit side, to prevent seepage/flooding of water to mine. Embankments are also planned to prevent inrush of water during rainy season or otherwise.
Geology & Structure
The block comprises of Talcher, Karharbari, Barakar, Barren Measures and Raniganj formations belonging to Damudas, a Sub Group of Lower Gondwana. Stratigraphic succession of the formations in the block is given in the Geological Report.
However, in NW Quarry area small exposures of sand stone and coal seam are found near the bank of Khora Nala in the western margin of the block. At places Karharbari Formation also rest directly over metamorphic.
The Barakars and Karaharbaris are the main Coal bearing formations in the block. Barakar Formation contains six coal Seams Seam Local(L),l , ll, lll, IV and V in ascending order splitted into upper, Lower and middle horizons forming altogether 23 Coal Horizons. Karaharbari Formation Contains 5 coal seams From K1 to K5 in ascending order. Karaharbari seams are thin and poorly developed in the East and west Quarry but they are relatively better developed in NW Area and mineable in NW quarry only.
The strike of the strata is generally
Nineteen faults with throw ranging up to 170m have been deciphered in East & West part as per GR Prepared by CMPDI. The throw of most of the faults ranges from 10- 40m.
NW Quarry is traversed by 8 numbers of faults. Among these, 3 faults are varying from 0 m to 50 m. Fault F1 is the major fault varying in through from 160m to 180m. This fault runs approximately along southern to western boundary of the block. The trend of the fault is