Search Documents

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 Collier D

The topaz resource at Torrington in northern N.S.W is currently the subject of a joint research and development programme managed by Pacific Copper Ltd, This programme has culminated in a pilot topaz calcination plant, located at Parramatta, which, through its operation, will establish the commercial viability of developing this mineral as an industrial raw material for both the refractory and fluoride chemical industries.

Jan 1, 1989

By Aziz NI, Beafi EY

In designing for a highly productive new mine during the present declining coal market, a very detailed ò planning is necessary. Attitudes of both management and coal operators may have to be changed, with more initial participation by the unions, governmental agencies, and the coal owners. A considerable number of Australian mines are remote from labour source and this trend is likely to increase particularly in the state of Queensland. Consequently such 'mines must be developed on the basis of the future technological and social changes in order to minimise both the capital and operating costs.

Jan 1, 1988

Seven papers have been reviewed and in this session. Broadly they can be grouped into three categories as follows: A Chemical Characterisation of Mine Waters Miller & Murray - Prediction of Time Dependent Factors in Acid Mine Drainage Jeffrey et. al. - Sulphide Oxidation in Pyritic Overburden; A Controlled Leach Column Study Sheridan et. al. - The Effect of Ore Type, Depth, and Leach Time on Cyanide Species in Column Tests using NaCN Leach Solutions B Mine Water Treatment Management Gilchrist & Hunt - The Recovery of Water from a Colloidally Stable Kimberlite Suspension Chapman, et. al. - Treatment and Utilisation of Hilton Mine Water

Jan 1, 1988

The alluvial diamond deposit in the Kimberley Region of Western Australia which became to be known as the Bow River Diamond Mine was discovered in 1982 by joint venture partners Freeport of Australia Inc and Gem Exploration and Minerals Ltd. Mining commenced in 1987. This paper describes the exploration programs and results from discovery to commencement of mining and reviews the public reporting of this process in the light of 1992 Ore Reserves Code (JORC, 1992). This case study illustrates the difficulties involved in resource estimation of alluvial diamond deposits. The study also shows that current reporting standards were, to a large extent, adhered to a full ten years before the diamond reporting section to the Code was formulated.

Jan 1, 1996

The effect of conditioning energy input on the metallurgical results of an emulsion flotation process has been attributed by previous authors to a detergency process. This publication shows that such a process does not explain the data and that an attrition mechanism is more appropriate.

Jan 1, 1969

By Isaev EN, Levin LE

New data on the geology of the Late Jurassic to Holocene sediments cover of the World and associated mineral resources (oil, gas, ferromanganese nodules, ores of massive sulphides and other metals) have been compilled in the Atlas at scale 1:25,000,000 and 1:10,000,000. The work was performed by scientists from four Institutes of Russia (VNllzarubezhgeologia, VNlloceangeologia, Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Sciences and Geological Institute of the Russian Academy of Sciences). The Atlas shows variation of thickness and formational composition of the large complexes (Upper Jurassic-Early Cretaceous, Upper Cretaceous- Eocene, Oligocene-Neogene, Pliocene-Pleistocene), distribution of oil/gas and ore deposits in each complex, data of deep- sea drilling (leg 1-130), thermo-pressure condition in the sedimentary basins within Circum-Pacific Rim.

Jan 1, 1995

By Nyamekye GA, Subramanian S

Adsorption tests have been carried out to elucidate the interaction mechanism between dextrin and sulphide minerals. Sulphides such as galena and heazlewoodite exhibit high affinity adsorption over the pH range that coincides with the iep of lead and nickel hydroxides, and is suggestive of chemical interaction. The adsorption behaviour with respect to the sulphides of copper is of the low affinity type, and follows a different pattern. The adsorption studies on graphite, support the chemical interaction mechanism, with the metallic impurities serving as adsorption centres. In conformity with the proposed mechanism selective separation of galena from chalcopyrite and heazlewoodite from chalcocite has been Achieved.

Jan 1, 1993

By Howlett P. F, Courtley S

A problem with secondary breaking at one of the mines of Pasminco Mining led to a study of new rock breaking technologies. Many of the techniques being developed had emerged from the thrust in the USA for continuous drill=break excavation. Such approaches to rock breaking highlighted the applicability of what would normally be classified as tunnelling techniques, to the secondary breaking sector - and possibly the reverse. As a direct result of the investigations for suitable technologies, Pasminco Mining supported the development of two improved rock breaking methods specifically targeting secondary breaking, one of which could be applied to continuous excavation.

Jan 1, 1993

By M Eichorn

Running a successful reagent plant trial is not an easy task, especially when trying to achieve an incremental improvement in a highly variable process, such as flotation. Cytec aims to achieve one per cent recovery improvement with 90 per cent statistical confidence. Most concentrators experience large fluctuations in recovery and so the æmagicalÆ one per cent is difficult to detect. With the aid of statistical software, including REFDISTR (proprietary) and ECHIPR, Cytec have developed a unique approach to differentiate between daily operational variation and actual process improvement. This paper describes how Cytec runs a plant trial based on extensive laboratory investigation and detailed analysis of historical plant data using statistical techniques.

Jan 1, 2000

INDEX OF CONTENTSIntroduction.Systems of classification of coals.RankClassification of Australian coals.Defects of systems in use in other countries.Indexing by Fuel Ratio.Classification by Ultimate Carbon/Ultimate Hydrogen.Relationship between Fuel Ratio and ultimate composition.Suggested convention for classification.Origin and Evolution.Notes on directions of change of composition on Carbon Hydrogen chart.Summary and conclusion.Acknowledgments.Bibliography.Appendix.

Jan 1, 1948

By Mason P, Waller C

The Phase I electrowinning system at KCGM's Fimiston Operation utilised the well proven technology of electrowinning precious metal values onto steel wool followed by calcining and direct smelting to bullion. The above process, while reliable and successful, was to some extent labour intensive. The Williams Mine in Ontario, Canada had published conditions under which precious metal values are electrowon onto woven stainless steel and directly removed using high pressure sprays. The current paper describes the testwork which was carried out to check the applicability of the Williams criteria to KCGM eluates arising from the elution of highly loaded carbon from the calcine circuit and lowly loaded carbon from the float tails circuit. Information is also given on the commissioning and operational experience which occurred.

Jan 1, 1996

By Morgans DJ

The aim of this paper is to highlight the social aspects involved in the preparation of environmental impact studies (E.I.S.'s) for mining developments. In particular, the paper will reveal that the social information provided in such E.I.S.'s can achieve much more than simply satisfying government requirements. Such information can form the basis of a strategy to deal with the settlement of a mine workforce in either an existing or newly developed community. A strategy of this type can go a long way towards avoiding many of the social problems and related industrial disputes often created in such circumstances. It will also be of significant benefit to the mining company in negotiating its infrastructure package with the local authority.

Jan 1, 1987

The kinetics of chlorination of alumina and bauxite with CO/CI2 mixtures were studied in the range 300-1100°C. The temperature of prior calcination is critical in determining the reaction rates. An optimum chlorination temperature in the range 600°C-750°C was demonstrated such that there is no increase in reaction rates with increasing temperature. This lack of rate sensitivity to rising temperature is largely a function of the influence of gaseous diffusion gradients in the porous alumina together with a progressive decrease in surface area.

Jan 1, 1976

By Parker GJ

The financing of smaller resource projects has proven to be a difficult problem for promoters and financiers alike as very often such projects have not met the requirements of available financing methods and promoters have equally found it difficult to establish credibility, management and technical ability with potential financing sources. Solutions to the dilemma in which many of these projects find themselves are not readily apparent but will need to be found if the full potential of Australia's resources is to be realised. INTRODUCTION The growth of so called project financing in its present form is normally considered to be a phenomenon of very recent times, however, paradoxically there are references to what could be called financing in the old testament. To confuse the issue further financing small resource projects may not, and very often are not undertaken on a project financing basis. It is therefore quite apparent that one should be completely clear on:

Jan 1, 1982

By R H. Boffey

The Osborne copper-gold deposit was discovered in North-West Queensland in 1989. Underground production activities commenced at Osborne deposit in April 1996. This paper will examine technical and operational aspects of the underground mine during its development to a 1.2 Mtpa operation . Technical aspects discussed include geology, mine design and mining methods, equipment fleet selection and capital infrastructure. Operational aspects discussed include the evolution and performance of the integrated work teams that are utilised at Osborne to perform all mining and maintenance activities.

Jan 1, 1998

Due to collapsing copper prices during 1974/75, a rapid changeover was made at the C.S.A. mine from mechanised cut and fill stoping with incline access to the more economic long hole open stoping method. In 1974/75, 20 per cent of total production came from open stopes. For the 1976/77 year-to- date, more than 80 per cent of total production has been won from open stopes. As a result, mining performance has improved considerably. Stops, drilling performance has increased by more than 50 per cent since the changeover from extension rod, 50 mm diameter cut and fill uphole drilling to 115 mm diameter in-the-hole hammer drilling of holes up to 65 m long. Stops blasting performance has improved from 750 tonnes to 950 tonnes blasted per manshift. Open stope primary blasting per- formance is much higher, but reduces to 950 tonnes per manshift when secondary blasting and firing of hung drawpoints are taken into consideration. Ground control, the most expensive and least productive aspect of cut and fill mining, is almost entirely eliminated in long hole open stoping.

Jan 1, 1977

North Stradbroke Island is a large sand mass offshore from south east Queensland. Dredging for mineral sands commenced there in 1956 and the rehabilitation discussed in this paper was commenced in 1967. The frontal dunes have a long history of instability, with little vegetation prior to mining. Re-establishment of the naturally stable contours is essential, and their rehab- ilitation is described. Vegetated high dunes present different problems requiring attention to regeneration of the native species. Methods developed over the past eight years are proving successful.,

Jan 1, 1976

Owing to the 'creeps' and consequent movements in the mines, followed by the recent fire in the southern workings, the whole of the orebody above the 800 ft. level is now very much crushed and broken. The same applies to the hanging wall or overwall coutrny, which has subsided towards the workings, so that for some years past all development work within the lode has had to be carried out with extreme care.The continual but slow subsidence of the overburden into the stopes necessitates a periodical renewal of all gangways in the lode, and, as the subsidence amounts to as much as 60 ft. in places, these new gangways must necessarily pass through the mullock-filling of old stopes in addition to broken ore. They at times pass into the broken ground of the hanging-wall for some distance, where the orebody has widened underneath by the original folding and puckering.

Jan 1, 1932

Government geoscience may be categorised by objective under three headings: Applied Research for Geoscientific Framework Studies, Resource Inventory, and Technical Advice. In Queensland, the Department of Resource Industries is active in all three categories. Under the program-based management system adopted in 1987, three Programs, namely, Geological Survey, Mineral Resources Development, and Energy Resources Development and Utilisation, have geoscience responsibilities.Prime responsibility for geoscience resides with the Geological Survey Program, which provides a geoscientific framework for mineral and energy exploration and the development of the State. Simply stated, the Program goal is to provide geological information when and where it is required. Geological Survey work also encompasses aspects of resource inventory and technical advice, complementing the work of the other two Programs. This role has a 122 year long tradition, for geoscientists of the Geological Survey have been engaged in investigations designed to facilitate the identification and utilisation of the mineral, water and energy resources of Queensland since 1868.

Jan 1, 1990