Overview
Contact
History and Methods
Production Overview
Retreat Mining
Advance Mining
Thick Seam Mining
Glossary
Australian Longwalls
NSW
Gunnedah Region
Hunter Region
Newcastle Region
Southern Region
Western Region
NT
QLD
Central
Northern
SA
TAS
VIC
WA
Equipment
Overview
Shearer
Photos
Australian Specifications
Videos
Drum
Pre-Cutter
Chisels
Ranging Arm
Haulage System
Cowls
Bretby Cable Handler
Controls
Plough
Powered Supports
Photos
Chock Supports
Shield Supports
Hydraulic Legs
Setting Pressure
Yield Load
Advancement
Control System
Face Conveyor
Twin In-board chains
Twin out-board chains
Single in-board chains
Pantechnicon
Sleds
Beam Stage Loader
Communications
Environmental
Ground Control
Overview
Abutment Pressures
Optimal Mining Direction
Support Capacity
Gateroad Support
Chain Pillar Design
Diamond Shaped
Single line of Square Pillars
Double line of Square Pillars
Single line of Rectangular Pillars
Double line of Rectangular Pillars
Effective Width
Subsidence
Sub-Critical
Critical
Super-Critical
Instrumentation
Difficult Conditions
Ventilation
Overview
Systems
R System
R System for gassy goafs
Z System
Homotropal System
Antitropal
Dust Control
Auxiliary Ventilation
Gas Drainage
Spontaneous Combustion
Face Transfer
Overview
Critical Path
Bolt up cycle
Photos
Recovery
Huesker System
Installation
Heading Development
Punch Longwall
Overview
Links
UOW
Outbursts
Bord and Pillar
University of Wollongong Home
International Longwall News
Aachen Technical University, Germany
Department of Mineral Resources
NIOSH
Coal Services NSW
History of Illawarra Coal
Joy Mining Machinery
DBT Mining
Subcritical Width
The diagrams depicted show the surface and strata affects for a subcritical width of extraction.
