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University of Wollongong

2006

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Articles 1411 - 1416 of 1416

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An Investigation Into Underground Mine Interaction With Overlying Aquifers, Huntly East Mine, New Zealand, G. Guy, W. Gale, B. Sinclair, D. Fergusson, B. Farnworth Jan 2006

An Investigation Into Underground Mine Interaction With Overlying Aquifers, Huntly East Mine, New Zealand, G. Guy, W. Gale, B. Sinclair, D. Fergusson, B. Farnworth

Resource Operators Conference

In recent years, Huntly East Mine has operated at a depth range of approximately 100 m to 220 m below a Quaternary aged clay, sand and silt aquifer that is connected to a nearby large river system (Waikato River). A key issue for mine planning and environmental management has been the development of mine design criteria to allow efficient mining of the reserves and to maintain the integrity of the aquifer. A case study and back analysis at Huntly East Mine is presented, which investigates the overburden conductivity and the impacts caused by mining-induced caving. The case study includes: i. …

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Developing Methods For Placing Sand-Propped Hydraulic Fractures For Gas Drainage In The Bulli Seam, K. Mills, R. Jeffrey, D. Black, T. Meyer, K. Carey, S. Goddard Jan 2006

Developing Methods For Placing Sand-Propped Hydraulic Fractures For Gas Drainage In The Bulli Seam, K. Mills, R. Jeffrey, D. Black, T. Meyer, K. Carey, S. Goddard

Resource Operators Conference

BHP Billiton Illawarra Coal is seeking ways to significantly increase gas capture rates from in seam drilling programs in its underground coal mining operations. Hydraulic Fracture Technology (HFT), a joint venture between SCT Operations Pty Ltd and CSIRO Petroleum, is working with Illawarra Coal to develop the capability to enhance gas drainage rates in the Bulli Seam using sand-propped hydraulic fracturing based on HFT’s experience at Dartbrook Mine where gas drainage rates were increased by 5 to 180 times. One of the principal challenges for implementing sand-propped hydraulic fracturing in the Bulli Seam is the high vertical stresses that cause …

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A Website On Coal And Gas Outburst Management, D. Vyas, N. Aziz, R. Caladine, L.Ucia Tome Jan 2006

A Website On Coal And Gas Outburst Management, D. Vyas, N. Aziz, R. Caladine, L.Ucia Tome

Resource Operators Conference

The University of Wollongong received funding from the Australian Coal Association Research Program (ACARP) in 2005 to develop a website on coal and gas outbursts in the Australian environment < www.uow.edu.au/outburst >. The primary objective of the website is to provide the coal mining industry with the information on outburst occurrence and mechanisms of outburst phenomenon and the means of treating it. The online system provides access to the experiences, knowledge and information acquired by the coal mining industry, research organisations and educational institutions in a quality controlled environment. Although the website is specific to the Australian scene, it nevertheless contains information …

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Joint Structure And Coal Strength As Controls On Rib Stability, Ross W. Seedsman Jan 2006

Joint Structure And Coal Strength As Controls On Rib Stability, Ross W. Seedsman

Resource Operators Conference

The assessment of the stability of coal ribs needs to consider not only the impact of the cleating and jointing in the coal but also the possible onset of failure of the coal itself. The same planar, wedge and toppling failure modes seen in pitwall slopes can be present in underground roadways. A 20o offset of the roadway from the strike of the through-going joints reduces the fall hazard, but a 35o offset may be required to reduce delays in installing support. Mining-induced fractures (MIF) in coal may be a manifestation of brittle rock behaviour and its preferential location at …

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Surface Goaf Hole Drainage Trials At Illawarra Coal, T. Meyer Jan 2006

Surface Goaf Hole Drainage Trials At Illawarra Coal, T. Meyer

Resource Operators Conference

Surface goaf gas extraction methods are successfully applied at a number of Australian and overseas underground coal mines. BHPB Illawarra Coal has recently undertaken a trial program to determine the effectiveness of surface goaf wells to reduce gas concentrations within the longwall ventilation circuit, and minimise gas related production delays. Three trial wells have been completed within the Bulli Seam operations. Considerable production variation between the three wells was recorded. A goaf gas reservoir model is discussed which describes a sequence of permeability changes within the different goaf strata, dictated by stress changes associated with caving, then recompaction. A requirement …

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Ground Vibrations Arising From Using Two Types Of Explosives - A Comparative Study, S. M. Hossaini, Gour Sen Jan 2006

Ground Vibrations Arising From Using Two Types Of Explosives - A Comparative Study, S. M. Hossaini, Gour Sen

Resource Operators Conference

Results of an investigation into ground vibrations carried out in an open pit coal mine in New South Wales has been analysed. As this mine is located in a sensitive area in regard to potential damage from ground vibrations, severe restrictions were imposed on the blasting operations. In this study 44 sets of recorded experimental blast data have been analysed. Two valuable equations have evolved from the data when two types of explosives were used. A comparison between the effects of two explosive types, namely ANFO and slurry, on ground vibration is presented. It has been shown that the intensity …

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