Dust Control
Ventilation / Ventilation / Safety 0 CommentOne of the environmetal concerns for underground mines is airborne dust. If dust is inhaled into the lungs it can cause numerous health problems. The permittable levels of airborne dust can be found in the New South Wales Coal Mining Regulations Act 1982 (CMRA 1982). (Also available as pdf) There are several […]
Read MoreOVERVIEW
Ventilation 0 CommentCoal mine ventilation systems must be designed so as to maintain at all times healthy and safe atmospheric working conditions. The main purposes of a coal mine ventilation system are to provide adequate quantities of fresh air to the miners in the workings and to render harmless toxic, noxious, and […]
Read MoreGROUND CONTROL
Ground Control 0 CommentAs bord and pillar workings are developed roof support becomes a major consideration and operating cost item. Support requirements vary considerably and are dependent on the physical conditions in the seam, which are often depth dependent, and the length of time that the workings are required to be serviceable. The […]
Read MoreEXTENDIBLE CONVEYOR
Equipment 0 CommentzIt is obvious that shuttle car conveyance is a batch, discontinuous process which reduces the overall production rates achievable from a continuous miner as a result of the inter car wheeling delays. Extendable or flexible conveyor systems reaching from the tail end of the panel conveyor to the continuous miner […]
Read MoreBREAKER LINE SUPPORT (BLS)
Equipment 0 CommentThe BLS were originally pioneered in the RSA at Middlebult Colliery by Voest-Alpine commencing in 1984 and later trialled in several Australian collieries commencing in 1987. Their subsequent use in pillar extraction panels has become widespread with some 60 units in operation by 1991. A BLS units is illustrated to […]
Read MoreBOLTER
Equipment 0 CommentTechnical specifications of Pneumatic and Hydraulic roof bolting rigs ALMINCOGopher CRAM Wombat FIREFLY INTFire Fly HYDROMATICARO-4000 SIGHBM 50 ALMINCOBeaver Mode of power Pneumatic Pneumatic Pneumatic Hydraulic Hydraulic Hydraulic Range (m):smallest (3 Stge)largest (3 Stge) 0.771 – 1.2271.374 – 3.657 0.442 – 0.7591.347 – 3.539 1365 – 32531145 – 2793 […]
Read MoreSHUTTLE CAR
Equipment 0 Commentout 150 m. By back spooling of cables from an intermediate cable anchorage point the operational reach can be doubled but this may result in reduced cable life and is usually used only for specialised drivages. To avoid cable tangling as the cars are usually used in pairs with a […]
Read MoreCONTINUOUS MINER
Equipment 0 CommentIn underground mining, first and foremost in the modernization process are the machines that extract coal: primarily the continuous and longwall miners. First introduced in the late 1940’s, continuous miners provided a quantum leap in the speed and efficiency of extracting coal. Modern versions operate on basically the same principal […]
Read MoreTHE MODERN WONGAWILLI METHOD
Modern Pillar Extraction 0 CommentThe Wongawilli system involves much larger blocks of up to 200 m wide. It consists of a 2 or 3 heading entry headings driven through the centre of the panels, splitting the panel into two smaller panels. The panel can be up to 1000 m long. Lifting of the fenders […]
Read MoreMODIFIED SPLIT AND LIFT
Modern Pillar Extraction 0 CommentRules and Procedures for BLS operation Only the miner driver and one other workman shall stand between the miner & the BLS’s position whilst the lift is being taken. Only one BLS to be lowered and moved at any one time. Always lower the rear legs first to allow any […]
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