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Reliability is not only important in coal mine planning, production and control. Reliability is also most important, and indeed is fundamental, to successful coal exporting.Coal preparation, blending, distribution, marketing and utilisation are areas of the coal industry in which reliability can be critical to coal exporting. Major elements of reliability which impact on coal exporting include coal quality, supply performance, -coal ownership changes, governmental regulations and policies, market reputations and differences in export markets.

Jan 1, 1991

The success of the In-Plant dust collection at the Albion Reid Quarry Plant situated at Para Hills, South Australia, is discussed in the light of co-operation at the design stage with particular emphasis on the duct- work and filter design. Other dust control facilities at the Plant are mentioned.

Jan 1, 1976

A variety of rockbolt designs and resin anchors are currently in use in underground mines. This paper identifies possible risk factors that may affect the intended performance of rockbolts. The paper also presents the outcome of a study on the variability of some aspects of fully encapsulated rockbolts undertaken across seven coal mines within the context of previous research findings on rockbolt anchorage performance.

Jan 1, 2003

By Moskovits EE

Spodumene was recovered from pegmatite by flota.ticn in lAoretory tests and ;pilot-plant, operation using an anionic collector e1 ulsi3.n. i sir_tilar process applied to beryl pegmatite g^.ve encouraging results.

Jan 1, 1963

By King CJ

The C.S.A. concentrator of Cobar Mines Proprietary Limited was expanded in 1974 to treat 80 000 tonnes of copper-lead-zinc ore per four week period. Jaw crusher product is fed to two par- allel primary autogenous mills followed by a secondary ball mill. Each mill operates in closed circuit with cyclones. Improved control of grinding rate and product sizing has been obtained from this circuit compared with the system of two parallel single stage autogenous mills. The main operational variables are des- Cribed.

Jan 1, 1978

By Burchell S, McGregor K

The process of design, measurement and review is essential if blasting is to continuously improve to meet the increasing productivity goals of most mining operations. To achieve continual improvements, many operators are turning to contractors to provide the necessary technology. Under this arrangement, the contractor becomes the supplier of a service rather than products and assumes some of the risks associated with blasting by guaranteeing the end result. If contractors are to obtain significant productivity improvements they must continuously improve every aspect of their business.

Jan 1, 1994

By Jingcai Xu, Singming Gou

A sound mathematical model is an important step to predict spontaneous combustion probability so that measures against coal self-heating can be adopted in time and at comparatively low-cost. This paper analyses main factors in coal spontaneous

Jan 1, 1998

There has been a significant increase in exploration and development of mineral wealth in South East Asia over the past five years. This paper describes the foreign investment laws in the region as they relate to the mining industry.

Jan 1, 1993

Indonesia remains relatively unexplored by modern methods. The great expectations created by the rush of companies taking up Contracts of Work over large areas during the epithermal gold/ring-of-fire boom (1985-7) have not been fulfilled. This is not necessarily a reflection on the prospectivity of Indonesia; on the contrary, many of the hopeful companies were,, under-staffed and under-financed to overcome the physical and logistic problems of exploring virgin jungle.After the stock market crash of 19th October, 1987, many of the weaker companies were unable to sustain their programs or to arrange farm-outs, and they have subsequently relinquished their tenements. In some cases, little or no field work has been carried out so that many areas remain untested. This poor performance will ensure much more rigorous scrutiny of future applications by the Indonesian authorities.

Jan 1, 1990

By J Zhiming, X Qian

All high stopes and pillars in Anqing Copper Mine were extracted by use of large-diameter longhole mining method. The height of stopes was 120 m. The forced mining was the leading concept that the safe and efficient operation was carried out in this mine, while the mining production was faced with the major technical problems on the stability of both primary ore pillars produced in the first-step stoping of stopes and the cemented fillbody on two sides of stope in the second-step stopping of pillars. Starting with mining technology, the authors emphatically describe the test results obtained in Anqing Copper Mine and make an approach to the deployment prospects and development trend of large-diameter longhole mining technology in China underground metal mines.

Jan 1, 2000

In conjunction with a study on wear of drag bits the effect of clearance angle on penetration rate was studied.Increases in clearance angle from 24 1/2 up to 30° gave an increase in penetration rate. Thereafter the rate was apparently affected by partial clogging with cuttings.Analysis of results was by a linear regression model and the t-test was applied to assess the significance of parameters in the penetration equation.

Jan 1, 1969

The kinetics of the hydrogen reduction of iron oxides in granular calcined bauxite were studied at 550-1,050°C in a shallow bed reactor. The iron oxides behaved as a dispersion of particulate iron oxide in a porous alumina matrix in which the iron oxide particles were reduced independently. The observed rates of reaction were found to be virtually independent of the bauxite grain size. At 800,°C and above, the reduction was multistage, Le.1. Fe203 +2Al203 (matrix) ?2FeAl204, and2. FeAl204? Fe0 +Al203.Reaction 1 was very rapid. Reaction 2 was much slower, the latter stages being controlled, at least in part, by phYSIcal changes of the Fe0 and a-Al203 produced in the reaction. Owing to the observed nature of the material, the reaction rate controlling steps could not be determined.

Jan 1, 1972

Gentlemen, you heard the good Doctor has commissioned me to make a'summary of the proceedings to date and also to close the said proceedings. It seems that over the years the business of making a summary alternates between'Mr. Pearce and myself, also I,think that w~oever is around onthe day in question 'obtains the task and apparently I drew it this, year. It is hoped you will be patient as previous experience in this capacity'indicates that the best way to proceed is to have a brief summary on each paper and then do a summary of summa~ies. This makes the approacha little cumbersome but it is felt to be fair to each author and it brings'back to the audience some recollections of what transpired at the time and they can make their own decisions, which may not necessarily agree with those of the 'sum'marisor.

Jan 1, 1983

By George CW

Western Mining Corporation (W.M.C.)operate a 30 000 tpa nickel refinery at Kwinana, W.A. using the Sherritt Gordon Process. Following ammonia/air leaching of sulphideminerals and subsequent copper removal, nickel metal is produced as powder by hydrogen red-uction of the ammonium sulphate-rich solution. Batchwise reduction in pressure autoclaves is preceded by an oxidation/hydrolysis step to ensure nickel powder quality.The reduction process is energy intensive, requiring high temperatures and pressures. Present energy requirement is 24 GJ per tonne of nickel reduced. Of this, 95% represents steam and hydrogen consumption and 5% electric power. The design and operation of the red-uction circuit is reviewed, outlining the main areas of steam and hydrogen usage.

Jan 1, 1985

The, Mount Charlotte orebody contains' 5,000 tons per vertical foot-Of'quartz gold ore at an estimated ore reserve grade of )just 'over' 3 'dwt. per ton, Production from it i.s plan ned at a rate of 1,000 tons per working day during 1964.

Jan 1, 1964

Wrenching between basement blocks is considered to be the mechanism whereby a well developed set of en echelon folds and an associated fracture system are developed in the Fitzroy Depression, Western Australia. The regular geometry of these structures accords with a right lateral regional coupling between high-standing, basement blocks bounding a trough filled with a thick pile of stratified Phanerozoic sediments. The structures developed during or after the Mesozoic Era, but the couple is inferred to have been applied to blocks outlined by old lineaments, which may reflect strains or ruptures in basement that developed during the Precambrian, and which were regenerated during Palaeozoic and Mesozoic time.

Jan 1, 1967

By Fulton E, Ring RJ, Waters DJ

The Nabarlek uranium treatment plant of Queensland Mines Limited (QML) is currently treating 600,000 tonnes of ore which was mined and stockpiled in a single four month period prior to commissioning of the plant. During the mining phase, material from the open pit was sorted into ore,'below ore grade uranium material (bogum) and waste using a truck discriminator (radiometric analyser) developed by Australian Mineral Development Laboratories (AMDEL). Ore was stockpiled in a single heap with the location and grade of each truck load being recorded. Bogum and waste were stored separately. From the information recorded, both computer and physical models of the stockpile were constructed. These models are currently used in the planning of day to day reclamation of ore from the stockpile.

Jan 1, 1984

By B J. Fallon

This study used structural equation modelling (SEM) to develop a series of models to explain the impact of work-life balance on employeesÆ perceptions of job performance, job satisfaction, turnover intentions and absenteeism. The sample comprised 257 participants (108 males and 149 females) from a range of occupations and levels of seniority. In sum, the results clearly demonstrated that successful work-life balance is associated with higher levels of job performance and worker satisfaction and with decreased levels of absenteeism and turnover intentions. The data also lent support to the impact of employeesÆ coping styles, schedule flexibility and supervisor support on employeesÆ abilities to balance work and life. It is concluded that tangible benefits to an employerÆs bottom-line can be anticipated from organisational initiatives to assist employees to better balance their work and personal lives.

Jan 1, 2005

Tonnes per Hour - Kilowatts per Tonne Tonnes of Mesh Size Produced Kilowatts per Tonne of Mesh Size Produced - Terms often heard in discussions of grinding mill and grinding circuit performance. All of them only tell a partial story as none of them relate to a fixed reference or overall standard measurement. Tonnes per Hour gives the production rate relating it to a specified or desired rate set as a goal or objective. As such it does not take into account changes in feed size, product size or grindability. Kilowatts per Tonne which accurately stated is kilowatt hours per tonne brings power consumed into the picture which is related to grindability but still does not take into account changes in feed size and product size without which power changes do not necessarily reflect the complete effect of changes in Grindability.

Jan 1, 1978

By Bebb G

This paper describes the use of SURPAC, a survey/mine planning software package as used at Central Norseman Gold. It details the basic operating principles of the package, the applications in which it is employed, and its time and cost benefits and efficiencies as they apply to the above operations, both surface and underground.

Jan 1, 1985