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The Geological Survey of the U.S. Department of the Interior is primarily a domestic agency whose responsibility is furnishing impartial data and analyses to the public, private, and academic sectors of the Nation. The Survey concentrates on earth-science issues, such as mapping the land surface, determining the quality and quantity of water resources, estimating the nation's endowment of fuel and nonfuel minerals, and predicting and mitigating geologic hazards, such as those inherent in the tectonically active Pacific Rim. One of the challenges to managing this program is striking a sustainable balance between concentrating on the problems society wants solved today and investing in the research that seeds our vitality for the future. The Geological Survey's role in the Pacific results from the Nation's geography and the Nation's long standing interest in and commitment to the region. The longest segment of the U.S. coastline borders the Pacific Ocean, one of our states is a Mid-Pacific island chain, our lands are 80 degrees--nearly one-fourth--of the Pacific perimeter, and our Exclusive Economic Zone (EEZ) underlies significant parts of the eastern, northern, and central Pacific waters. Thus, the program of marine and terrestrial science operating in these areas make substantial contributions to the world's growing understanding of the Pacific realm.

Jan 1, 1990

By E Topal

There are presently no suitable underground mine production scheduling optimisation models available for application to sublevel stope mining. Scheduling underground production for maximum return is therefore still a manual process, which generally involves scheduling production from the next available highest cash flow stope within the operational constraints of the project. In most mining operations, the scheduling problem is too large and complex to guarantee truly optimal results through manual scheduling. This paper reviews some general optimisation studies that have been proposed for underground hard rock mining. Furthermore, an example of a mixed integer programming model is presented for a small conceptual sublevel stoping operation. Comparative results of a schedule generated by a mixed integer programming (MIP) production scheduling model and a manually generated model on a nine stope example is presented. Results indicate that the potential benefits of the MIP production scheduling model for the purpose of maximising NPV are significant. Finally, a new constraint was formulated to limit multiple exposures of fill masses for use in an existing MIP production scheduling model. Testing of the formulation took place on the central stope of the nine stope example, which showed that the formulation performed its task without breaking other operational constraints.

Jan 1, 2007

Both innovation and excellence are desirable attributes of education, as they are also markers in the progression of the human race, but how attainable are they? The interaction of minerals and humanity provides a special insight into the development of both criteria, from the discovery that chert cuts, through the Bronze Age and the first use of metal alloys for implements, to using coal, oil and uranium as sources of fuel. However, there have been many hiccups along the way, where excellence in one respect has meant disaster in another. Examples are in the exploitation of asbestos, and in traditionally poor work practices in mining, both contributing to the widespread public belief that minerals and mining are ecologically undesirable. Yet is this perception based on the unrealistic expectation of innovation and excellence being simultaneous qualities of any given process? Common sense born of experience indicates that the journey from one, to the other, is usually a long and often tedious process, with much trial and error before excellence is attained. In our time, the partnership between academia and industry is the usual pathway to achieve it. Even so, we should take care that innovation does not become overwhelmed by the pursuit of excellence: as history clearly demonstrates, humanity depends upon both.

Jan 1, 2004

Project managers must juggle many aspects to bring their project in on time, on budget, and in accordance with the aims of the project owner. Whether the project is a mining feasibility study, a technology implementation or a construction project, it falls to the project manager and his or her team to deal with risk from two standpoints, which may be at odds with one another. First, a project team must deal with risks to the project itself û that is, risks to on-time, on-spec and on-budget delivery against the value promise made to the customer. Second, there is the management of risks within the subject matter of the project, undertaken on behalf of the customer. The project manager cannot dodge this responsibility; yet there is a tendency (particularly in smaller, in-house studies) to avoid digging too deep, possibly for fear of what may be uncovered! This paper investigates the responsibilities of project teams in regard to risk management and reporting. It examines ownership of project risk; the nature of risk management activities undertaken by the team during the course of a project; and outlines some controls to ensure that the two opposing arms of project risk are reconciled for the benefit of both the project team and the project owner.

Jan 1, 2007

By Eoffe SW

The wide application of computers in beneficiation plants has resulted in the creation of a number of complex automatic control systems at all stages of ore dressing processes. To create such systems it is necessary to solve complex problems of analysis and calculation. The application of computers to solve these problems demands development of simple and effective methods of investigation and simulation of ore dressing process dynamics because all the known methods are complicated in usage and cannot guarantee the desired accuracy and quality of process control. A new grapho-analytical method of investigation and calculation of ore dressing flow sheet dynamics, worked out by the authors of this paper, is based on proportion method development and is used to construct dynamic characteristics of the investigated processes. It is possible to use the given method for investigating benefication schemes with flotation machines having non-linear static characteristics and circulating loads. The suggested method of investigation of concentration flow sheet dynamics allows us to obtain dynamic characteristics of technological process parameters in both linear and non-linear systems. Moreover, the final result can be obtained without labour consuming analytical calculations by a simple graphical construction based on the static characteristics of the known equipment and processes.

Jan 1, 1993

Competitive commercial circumstances internationally provide a prime impetus for miners to seek new technologies as a means to profitability and survival. Engineering and project management activities play a vital role in establishing, operating and developing the capital facilities used by miners. Computer based technologies are the single most important technology for maintain- ing competitiveness in engineering and project management into the future. Current applications of computers in engineering design and drafting are finding economic applications, computer-aids are more readily introduced, accepted and profitable. Computing technology is advancing very rapidly and on a broad front in hardware, software and communications. This technology advance is improving the ability of engineers and project managers to provide a high quality, responsive and low cost service which will improve in parallel with computer technology. As this technology advances, a key challenge is created for managers in selecting hardware and software, in developing people and organisations and in marketing the technology to advantage. While the future holds many exciting developments, people will still hold the key roles. While the nature of their roles may change, the final acceptance or rejection of technology will be by people, whether as users or owners, who will judge on the basis of whether their stake is improved or not.

Jan 1, 1986

Broken Hill is situated at an elevation of approximately 1000 ft. above sea-level, on the Barrier Ranges, in the State of New South Wales, Australia. It is approximately 700, 280 and 330 miles from the ports of Sydney, Pirie, and Adelaide, respectively.The summers are usually hot and dusty, with a recorded maximum shade temperature of 114° F. The rainfall averages approximately 9 in. per annum.

Jan 1, 1932

This paper discusses basic practices of operation applied to raise drilling. It draws attention to critical areas that tend to be neglected. A brief history covers development of raise drills. The elements of the equipment, derrick assembly, drill string and reamers are ex- amined. Particular emphasis is on the drill string. It is concluded that manufacturer and operator can benefit each other by closer interchange of ideas.

Jan 1, 1977

By Z Zhao

Coal dust is hazardous to underground coal workers and water spray is the most common and economic method for controlling coal dust. Previous studies proved that the addition of surfactants can improve the performance of water spray on coal dust suppression. The evaluation methods for surfactants vary from different studies. The zeta potential test is a common method for evaluating surfactants with ionicity. Generally, the suspension of coal dust with pure water usually showed a negative value of zeta potential. The addition of cationic surfactants can increase the zeta potential to a positive value with a small dosage, while the addition of anionic surfactants can only lower the zeta potential. However, there is a lack of comprehensive study to investigate the relationship between the zeta potential and the suppression performance for coal dust. The aim of this study is to reveal the consistency and discrepancy between the zeta potential and the suppression efficiency of a surfactant. Firstly, the mixture of cationic surfactant solutions and coal dust would be evaluated by the zeta potential test. The wind tunnel tests would then be conducted for the same surfactant solutions to measure and calculate the suppression efficiency. It was found that the addition of surfactant can increase the zeta potential and the suppression efficiency and it reached the greatest efficiency when the zeta potential approached to zero. The equilibrium of zeta potential can benefit the suppression performance of surfactants in the wind tunnel test. The result of this study can achieve a better understanding of the mechanism for coal dust suppression. The selection of surfactants will also be suggested for researchers or industries in terms of coal dust control. It would be more economic if a similar performance could be achieved by less consumption of surfactants.

Oct 12, 2022

A modular computer-based monitoring system for mines is dis-cussed. The system consists of the following modules : production moni-toring system HADES, methane monitoring system CMC, seismoacoustic and seismometric systems SAK and SYLOK, communication systems. The system enables one to compose flexible,` economic structures according to the specification of a mine. Application of microcomputer-based monitoring and control systems in coal preparation plants also is discussed.

Jan 1, 1985

By Trudinger JP

Mt. Newman Mining Company Pty. Ltd.3 oper ates the Mt. Whaleback iron ore mine in the Ham- ersley Iron Ore Province of Western Australia. The present rate of production of high grade hematite iron ore is 33 million tonnes per year. Mining is by open cut quarrying,with 15m high benches. The present quarry operations will be extended to a large oval pit to win over 1400 million tonnes of iron ore. The pit slopes will extend up to 500m in depth and the perimet- er of the slopes will exceed 15km. Sixty per- cent of the ore is below the water table, which presently lies 45m below the general plain level Dames & Moore, rock mechanics consultants designed the pit slopes during early mine devel- opment to ensure an economic and safe operation.

Jan 1, 1975

By P Revell, A Jenkin

This paper presents an analysis of significant Australian-based R&D programs focussed on the minerals industry, which was commissioned by CRC ORE. The landscape analysis may assist organisations with R&D management issues including program creation, program/partner selection, portfolio management, and public policy settings. The dataset was collated early in 2020, and contains programs being conducted by or with Australian-based ‘Research Service Providers’ (RSPs), most notably Universities and CSIRO. It does not include R&D being conducted in-house by mining and METS companies, or by them with other organisations that are not RSP’s. The dataset contains 65 R&D programs, with total annual cash funding of $229m (70% from industry and 30% from government). The total funding compares unfavourably with the combined R&D expenditure of Australian universities and CSIRO of over $12b, and minerals industry export revenues of over $200b. The R&D landscape is analysed by program numbers and funding, technical domain, geography, and funding source. Areas of relative strength are noted in ‘mineral processing’, CSIRO Minerals, and the CRC program. Areas of relative weakness are noted in ‘bulk materials handling and logistics’, ‘tailings and waste management’, and ‘social and community’. The field of preconcentration is noted as a current area of R&D strength, but it is under significant threat with the impending completion of CRC ORE. The overall R&D landscape is characterised by a majority of small-scale programs, low levels of industry coordination, a low focus on step-change innovation, and total funding lower than should be expected for such a large critical industry. It is hoped that key stakeholders in the Australian minerals industry, particularly governments, and mining and METS companies, reflect on the analysis and act to address holistic weaknesses.

Nov 10, 2020

By J Abols, T Hughes

The selective recovery of gold and silver from solutions containing other metals, such as copper, is possible using AuRIX«100 resin in conjunction with the Gekko Resin Column. Selectivity is driven by controlling the solution pH, which enables activities such as loading copper, gold and silver and then selectively stripping copper before gold and silver. Alternatively gold and silver can be loaded and the copper left in solution. The selective loading of gold while reducing the silver loading has also been demonstrated, opening the possibility of producing high grade gold dorT from high grade silver pregnant leach solutions. This paper reviews the AuRIX«100 resin and Gekko Resin Column Technologies, discusses the uses of AuRIX«100 in the recovery of gold and silver and the chemistry relating to several projects for which AuRIX«100 is being tested.

Jan 1, 2005

By B Hall

In feasibility studies the choice of optimum cut-off grade is typically based on an evaluation of tonnage grade curves and manual design of stopes at one or two cut-off grades. In the industry these stope designs are usually based on break-even cut-off grades, but there is little consensus on what cost and price assumptions ought to be included. A new tool for automated stope design has been developed that generates sets of stope shapes for a nominated range of cut-off grades, or depending on the nature of the mineralisation, cut-off values based on net smelter return calculations in the block model. The stope design procedure includes constraints in stope and pillar geometry for the selected mining method and can be used to evaluate sublevel interval and sensitivities to other design parameters in the specific geological and geotechnical environment. These ænested stopesÆ are analogous to ænested pitsÆ in open cut design, and can be used as a key input in the æhill of valueÆ methodology for the evaluation of the optimum cut-off grade in underground design. The results of many consulting studies indicate that a break-even cut-off grade will not be the optimum cut-off grade. A particular benefit of the new stope design tool is that the design rules used to establish stope shapes in the feasibility study can then be used in mine production, in an optimal and repeatable method. This methodology is being advanced in the AMIRA P884 PRIMO project, which is a new research collaboration coordinated by AMIRA International. The project has brought together active research groups in Australia and Canada, with the goal of developing a flexible framework and set of software tools for optimisation in underground mine design.

Jan 1, 2009

By Merritt RR

The equilibrium phase relations in the Fe- Mn-Ti-0-S system were established at 1380 and 1485 K. The elemental distributions between the equilibrium phases were obtained by chemical- ly analysing selected samples from the phase study. The results are considered in relation to the coal reduction process for upgrading ilmenite. The beneficial effect of adding sulfur to a kiln that uses a manganese-rich feed is ex- plained by the formation of a metal-sulfide solid-solution phase that removes part of the manganese from the oxide system. The optimum conditions for operating the reduction kiln are determined, and the practical need to operate the kiln at other than optimum conditions is explained. It is shown how the experimental data can be used to predict the best compromise conditions for reduction and the resultant purity of the product.

Jan 1, 1980

The development of paraprofessional courses in metallurgy and related disciplines, by the Department of Technical and Further Education in New South Wales, is outlined in this paper. The changing nature of metall- urgical educational requirements is summarised, and various attendance patterns discussed. The potential advantages of the sandwich system of College attendance, to the more distant sectors of the mineral processing and metallurgical industry is outlined. Some of the likely future trends in technician education are presented. These include the need to respond to the changing expectations of technician employers, as shown by industrial surveys, the role of experiential learning, the need to integrate courses so that students can build on prev- iously completed courses, the possibility that future technicians will require a multi- disciplinary background and the provision of easier access to technical college facilities by potential students and industries.

Jan 1, 1978

By Masters I. M, Ozberk E, Chalkley M. E

The integration of iron rejection as hematite with the Sherritt two-stage zinc pressure leach process has been investigated on the laboratory scale. The two-stage pressure leach process is applicable for a greenfield zinc plant, or for replacement of the conventional roast-leach circuit in an existing zinc plant. An excess of zinc concentrate is used to accomplish acid neutralisation in the first stage of pressure leaching, and the residual concentrate in the first stage residue is treated with an excess of acid solution in the second stage of pressure leaching to yield high zinc extraction. Integration of hematite precipitation with this process allows for the potential sale of the iron residue, greatly decreasing the residue disposal problem. Two flowsheets containing the desirable features of both of these processes are described in this paper, along with laboratory Results.

Jan 1, 1993

Although geophysical methods of prospecting have proved indispensable in the search or oil deposits elsewhere; it is only 'in recent years that they have been used to any significant extent in Australia. The increase in their use has been quite remarkable over the past two or three years, due in Sao small measure to the encouragement given by means of Commonwealth subsidy. There is no doubt that the use of' geophysical methods will coxi-tinue to increase and this increase could be greatly accelerated as and when oil is discovered in commercial quantities,This review of their use A in Australia and the remarks and statistics are confined to work on the mainland. There has been, a substantial amount of geophysical work in Papua, but as operating conditions are so very different to the mainland Papua has been regarded as a separate province.

Jan 1, 1962

By E Whiteman, L Reyneke, H Horsch

Heavy mineral sand deposits are a source for the economically important element titanium, which is contained in minerals such as ilmenite and rutile. In heavy mineral deposits ilmenite displays various degrees of alteration. Natural weathering of ilmenite involves the removal of Fe and thus results in an increase in the Ti-content. Minerals such as pseudorutile, ferropseudobrookite, anatase and the ill-defined mineral aggregate leucoxene, which consists mainly of various amounts of remnant ilmenite, pseudorutile, ferropseudobrookite and anatase, are typical replacement products of ilmenite. Ferropseudobrookite occurs as a recrystallised, optically and chemically distinct mineral phase. Textural relationships suggest a diversity of physicochemical conditions including weathering and metamorphism that led to the formation of complex mineral assemblages and textures. In the heavy minerals industry the alteration products of ilmenite are generally referred to as æaltered ilmeniteÆ and/or leucoxene. The distinction between æaltered ilmeniteÆ and leucoxene is not consequently defined and is very much dependent on economic factors and specific mining operations (ie determined by deposit specific mineral assemblages). Generally the term leucoxene is used in the heavy minerals industry as a collective description for ilmenite alteration products with TiO2-components ranging from 65 - 95 per cent. A detailed comparative mineralogical investigation including microscopic, SEM and QEMSCAN« techniques show that it is possible to identify and quantify the replacement products of ilmenite on a micron scale. QEMSCAN« generated particle maps were graphically compared with photomicrographs taken by applying reflective light microscopy. The resulting information can be integrated over the entire sample with respect to composition, absolute and relative mineral abundances, grain sizes, volumes, densities, textural relationships and liberation potentials. This provides a powerful tool for a first appraisal of the physicochemical behaviour of bulk samples and individual particles during metallurgical processing.

Jan 1, 2008

By Vogwill R. I J

The Boddington Gold Mine, operated by Worsley Alumina Pty Ltd, is located about 100 km south of Perth and is one of the largest-producing gold mines in Australia.Multiple open pits are planned and several extend below the water table, through the deeply weathered lateritic profile and into the underlying Archean bedrock. Groundwater related mining problems, such as poor trafficability, wet floor conditions and slope instability began to occur early in 1990.The mine is located within Archean greenstones which are steeply dipping and faulted. Rock types include mafic to felsic volcanics, pyroclastics and sediments. These rocks have been regionally deformed and metamorphosed and are intruded by quartz micro-diorites and post-mineralisation dolerite dykes. Deep weathering has produced a typical oxide profile consisting of laterite, clay and saprolite zones underlain by weathered to fresh bedrock.

Jan 1, 1993