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By Mackenzie JMW, Virnig MJ, Kotze MH

A new range of solid and liquid ion exchange extractants for gold based on the guanidine functionality is described. These extractants have pH versus gold extraction isotherms which lie between those of the conventional weak base and strong base resins which have previously been studied as aurocyanide extractants. Possible applications of these new extractants in gold recovery are discussed.

Jan 1, 1993

By Turner W. G, Trundle R. S, Medland D. G

Contracting has evolved from basically a tradesman providing a service for an `employer' to a multi disciplined organisation providing an all compassing service for a client.Having commenced its activities as Thiess Bros Pty Ltd, providing simple earthmoving services in rural Queensland, Thiess Contractors Pty Ltd which provides a wide range of services for Governments and Industry is used as an example of an experienced multi-disciplined Contractor.

Jan 1, 1992

One of the often overlooked factors affecting the capital investment decision in new or existing plants is the value of stock holdings necessary to maintain the plant. This paper puts forward a simple decision matrix on whether a part should be stocked depending on 1. the criticality of the item of equipment in terms of the effect on cash flow of its failure, 2. the lead time of the part, and 3. the stock holding value if it were Stocked.

Jan 1, 1986

By J W. Harris

There are numerous detrital diamond deposits worldwide with uncertain or disputed links to known primary kimberlite/lamproite sources. In this study, we utilise 40Ar/39Ar dating of clinopyroxene inclusions in diamonds as a provenance tool applied to the mega-placer deposits along the West Coast of southern Africa. These data demonstrate that most West Coast diamonds originated known Cretaceous kimberlites on the Kaapvaal craton with negligible input from proximal Permian glacial deposits. An EXTENDED ABSTRACT is available for download. A full-length paper was not prepared for this presentation.

Jan 1, 2008

During Gepp's lifetime, Australia was in the forefront of science and art in metallurgical practice. This did not come easily for although blessed with a unique mineral deposit at Broken Hill large in size and rich in values much courage and daring was needed in the development of processes whereby they could yield the best results.The resultant development of the flotation processes at Broken Hill is one of the most important inventions of the 20th century.

Jan 1, 1993

By Napier-Munn TJ

The Whiten model of crushers is currently being refined and extended at the JKMRC, with particular reference to cone crushers. This paper describes the model as a predictor of crusher power draw, discusses the application of the model, and considers the relationship between power draw and crusher performance.

Jan 1, 1988

Polarization phenomena associated with the use of an agitated bed of particles as an electrode for metal deposition were studied. The concentration polarization at this type of electrode is much smaller than that occurring at a fixed or moving electrode surface. Agitated particle electrodes can be used to electro-reduce copper from solutions over a wide range of concentration and at cur·rent densities up to 2000 AIsq. ft. of bed cross section.

Jan 1, 1971

A unique set of circumstances has devel oped in the Mt. Newman Mining Co. Pty. Limited's project in the Pilbara because the mining town of Newman was built almost entirely by the Company whereas residential areas built by the Company at Port Hedland were developed as an adjunct to an existing town. The following discussion points out the different problems which have been developed in the two areas, even though basically the stand- ard of housing and general amenities is the same, and the means taken to overcome these Problems.

Jan 1, 1973

By Fitchett K

Refractory application in the major iron and steelmaking units are discussed. Mechanis- ms of refractory consumption as revealed by pre- vious studies are reviewed and current practice is evaluated. Deficiencies in refractories now in use are noted and some lines of development are indicated. The iron and steelmaking units discussed are generally restricted to those subject to slagging, structural change or erosion at steel or iron making temperatures, and include the Blast Furnace, Hot Blast Stoves, Hot Metal Ladles, Basic Oxygen Furnaces, Continuous Cast- ing Units and Steel Teeming Ladles.

Jan 1, 1972

By Stockton N. D

Gravity concentration of gold is an important facet of gold processing technology in Western Australia. While great interest has been directed at gold leaching technology and considerable developments achieved, gravity concentration has received much less attention and this paper provides an update on the current practice and developments that have been achieved in recent years.A survey of 72 gold processing plants in Western Australia was conducted in 1991 and some 31 questionnaires were returned for analysis. Of these, 19 plants were using gravity concentration and this paper highlights some of the features of these operations.

Jan 1, 1992

By K Heiskanen

Flotation is affected by several factors, part of which depends on the mineralogical characteristics of the ore and part on process variables. Sulfide Ni-Cu ores occur typically in mafic and ultramafic igneous rocks. Serpentine minerals are also common. As a consequence of metamorphosis, sulfides and secondary minerals may be finely disseminated in an altered ore matrix. The floatability of minerals depends also on process variables. Oxidation of sulfide particles, process iron and dissolved ions in process water affect the behaviour of sulfides. The effects of some essential factors on flotation of Ni-Cu ores are considered.

Jan 1, 2005

Consideration of the questions: (i) is it feasible to study groups of processes in a generalised way? (ii) to what extent does purpose affect the form of a process model? (iii) are there any significant, novel investig- ations which can be made by computer simulation? (iv) what long-term developments are desirable in extractive metallurgy? has led to some new broad objectives for research in hydrometallurgical process engineering. Propositions for grouping processes, developing models for different specific purposes, using a systems engineering approach and developing high technology processes are discussed, and the role of computer simulation indicated by reference to particular projects.

Jan 1, 1984

This paper suggests the models for determination the optimum life of machines on the basis of sum and difference of investment and maintenance costs. The economic-mathematical models are based on complex percentage method taking into account the time factor of referring cost. The following strategies of maintenance policy have been considered in machines repair: a strategy without investment, a strategy with continuous investment and a strategy with step-like investment. The effect of value of investment in repairing and time interval of investment on optimum machine exploitation life has also been considered. An illustrative example is presented.

Jan 1, 2003

The characteristics'of the Darling Range bauxite deposits are compared with tho"se of other large deposits in Australia and over seas The Bayer Process is them described with particular reference to the way.in which the process has been adapted to suit Darling Range bauxite. The.main characteristics considered are the physical aspects of the deposit.and its' effect on mining techniques, the grade of the ore and its effect on residue treatment, the nature of the alumina, iron and silica. content and their effect on process methods, equip- ment and raw material. Usage.

Jan 1, 1973

I trust you know now or will know by the time you havecompleted your degree and added a little on-the-job experience,how to make the product from the mine you are working for. Butyou may not know the process to turn it into dollars, which ofcourse will be the life blood of your company. I am not going topromise to turn you into super salesmen, but I hope I can takeyou beyond the level of believing that selling our mineralproducts is as simple as putting in it on to a train, waving itgoodbye and waiting for the cheque to turn up in the mailbox afew weeks later.

Jan 1, 1994

By Wadsley MW

This paper gives an overall view of the CSIRO-SGTE computer system for thermodynamic calculations. The basis of the system is the coupling of a large self-consistent numeric data bank of thermodynamic information to a modular set of application programs. These seven programs cover management of data files, calculation of thermodynamic properties for species and reactions, plotting of predomin- ance area diagrams, equilibrium and enthalpy balances for complex processes, analysis of thermodynamic efficiency and the estimation of unknown properties. The data bank contains a wide coverage of species and data types so that the system may be applied to many areas of chemistry and metallurgy.

Jan 1, 1984

By Ghiani M, Satta F, Zucca A, Peretti R

After a brief introduction on the principles of contact electrification and a synthetic illustration of the Turbocharger separator, the successful results obtained with different raw materials are given and discussed, with particular reference to a North African run-of-mine with carbonate gangue, a crude ore from India containing pyrite and a mineral sample from Angola having quartzeous gangue. The pre-eminent effect of target surface temperature in the charging device of the separator is emphasised. On the basis of the results of both batch experiments and long-run tests the prospects of industrial application appear very interesting both from the technical and economic points of view, even when compared with froth flotation.

Jan 1, 1993

By Massy-Greene RB

Limited recourse financing techniques reduce the financial exposure of equity holders to major mining projects by transfering some of the risks to the banks which provide loan funds for project development. This can only be achieved by a clear understanding of the principles involved. Engineering and management decisions on how the resource is to be developed and extracted must be made in the light of lender's requirements. The structure of sales contracts, joint venture agreements and many other documents can be important in limited recourse financing. If projections show that the debt can be repaid from project cash flow, loan agreements and other arrangements can restrict lenders ability to look to the equity holders for repayment of project loans.

Jan 1, 1981

The organization of this department is as shown in the following chart:Chief Mechanical EngineerPowerGenerationWorkshopsNew ConstructionMaintenanceTransportCommunity ServicesMineMillSmelterDesign and OfficeOrganizationThe functions of each section will be described separately.MAINTENANCE UNDERGROUND DEPARTMENTThis section covers all mechanical equipment underground as well as fans and winders on the surface, the headframes, and conveyors from the shaft to the crude ore bins. As has been descrIbed, No. 2 Ore shaft was opened up to the surface and a new headframe and receiving bins were erected, and when the new lead crushing and screening plant was constructed and ready for operation, the rope sheaves...

Jan 1, 1953

Some only types of bank finance are appropriate for mining development, with conventional fixed rate finance having significant limitations of flexibility. New, innovative and flexible instruments have recently been utilised within project financing packages. A strictly limited number of specialist project finance banks exists, with the necessary specialist personnel able to address project cost-competitiveness, cost and commodity forecasting, joint venture negotiations, and completion and sales undertakings. Different techniques of internal bank appraisal are applied, with the usual equity investment project valuation criteria being seldom useful for loan assessment purposes. Company attention paid to the preparation of a sensitively structured bankable presentation can prove most effective for securing development project finance. Substantial scope is possible for savings of time and money.

Jan 1, 1983