Geology Of The Padhrar.docx

GEOLOGY OF THE PADHRAR Chorgali formation contains the different deposits which are listed below from top to bottom: Nadular lime stone + clay + soil

10-35 ft

Massive deposit of Sakasar lime stone

100 ft

Shale Band

10-15 ft

Namal Lime stone (chalky)

100 ft

Patala Shale

40-60 ft

Coal Seam inside after 30 ft or 50 ft

1.50- 2 ft

PADHRAR COAL MINE PCP 3

In this padhrar caol mine the short wall mining method is employed. The access entry is an incline at an angle of 33˚ having length of 982 ft and height 8 ft and 6 ft wide. At the bottom of the incline there is a chute system for the loading of the mine cars. The horizontal distance from chute system to face is 1500 ft. And there are five entries of 50 ft apart from each other.The entry is 150-200 ft long from main entry to the face.Pannel entries are 6 ft high and 6 ft wide. The face is 3 ft high having 1 ft under cut and above under cut there is a coal seam of average 1.5 ft.

HAULAGE SYSTEM: The engine haulage system is used for the hauling of mine car from chute system to the surface.The rocket engine having 6 cylinders of 88 hp is used to drive the mine car to out of the mine.The cars used in the mine are of granby type (“W” shape) which open from both the ends to dispose off the coal at loading station near by chute system.Gage of the rail track is 27 inch.The rope used for the hualage of mine cars is 20 mm in diameter and length 1200 ft. In mine the hand tramming is used to haul the mined

coal from face to chute system. At the surface there is a head frame of “A” shape at which an automatic tippling system is employed.

VENTILATION SYSTEM: Natural ventilation is assited by the mechanical ventilation in which 2 blower fans of 0.5 hp and 1 exhaust fan of 5 hp is used. The blower fans are used in the 3rd and 4th entries while the exhaust fan is used at the end of the face. The pipes of poly fiberic material are used to provide air from blower to the working face. The ventilation circuit is completed through the gob entries which are connected to the other shafts of PCP 1 and PCP 2.

SUPPORT SYSTEM: Cap and post are used to Support main entries and panel entries and the square sets are used to support the face.

LIGHTING SYSTEM: The 60 W bulbs are used to enlight the whole mine.

WORKING AT THE FACE: An under cut of about 1 ft is made to provide an additional free face to the coal seam using hand pick. Coal is also broken by hand pick. The coal is excavated in advanement and the back filling is done to give the support.

COAL MINING PRACTICES IN PAKISTAN PMDC is operating the following coal mines: 1. Lakhra Collieries, District Dadu 2. Degari Collieries, District Mastung 3. Sor- Range, District Quetta 4. Shahrig, District Sibi

LAKHRA COLLIERIES Location Coal Field

176km north of Karachi Or 65km northwest of Hyderabad Lakhra Coal Field

Geological horizon

Paleocene

Type of Coal

Sub-bituminous to lignite

Calorific values Working system

2, 570 to 4, 260 kcal Room and Pillar method

Leased area (two leases)

5, 096.49 acres

Total coal reserves

38.82 million tons

Production (2006-07)

185,533 tons

Location Geological horizon Coal Field Type of Coal Calorific values Working Depth Mining system Leased Area Coal reserves Production (2006-07)

DEGARI COLLIERIES 35km south-east of Quetta Eocene Degari- Sor-Range Sub-bituminous-A to high volatile B-bituminous 4, 830 to 6, 060 kcal 1000 meters (deepest mine in Pakistan) Long wall system 4, 779.17 hectares 15.42 million tones 37,25 tons

Location

SOR- RANGE COLLIERIES 16km east of Quetta

Coal Field

Degari- Sor-Range Field

Geological horizon

Eocene

Type of coal

Sub-bituminous-A to high volatile B-bituminous

Calorific values

4, 930 to 6, 100 kcal

Mining Method

Long wall system

Leased Area

1, 674 acres

Coal reserves

12.95 million tones

Production (2006-07)

56,005 tons

SHAHRIG COLLIERIES Location Coal Field Geological horizon Type of Coal Calorific values Mining Method Leased Area Coal resources Production (2006-07)

160km north-east of Quetta Shahrig- Khost- Harnai Coal Field Eocene Sub Bituminous B to heavy volatile Bituminous-A 4,420 to 7, 000 kcal Long wall system 6, 551.46 acres 28.97 million tones 121,549 tons