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By Hughes A

Nchanga Division of ZCCM has installed and operated a trolley assist system on part of their truck fleet for some three years. This paper examines how the system came to be chosen and how the many features of construction and operation were dealt with. The economics and productivity of the system are presented as are the personnel aspects of acceptance and training. Zambia Consolidated Copper Mines is a state controlled copper mining company formed by the amalgamation of the former Nchanga Consolidated Copper Mines and Roan Copper Mines. The company operates seven copper mines the largest producer being the Nchanga division, which is scheduled to produce some forty-two percent of Zambia's copper production. The division operates four open pits and an underground mine which produce annually some 192 000 and 96 000 tonnes respectively of copper contained in ore.

Jan 1, 1986

The sucessful use of sewage sludge in land rehabilitation has been established and there is an abundance of overseas information on sludge reuse. Unfortunately Australia is behind Europe and North America in establishing sludge reuse policies and regulations. In Victoria the EPA has no publicised regulations and no communicated policy for sludge reuse. In the absence of sound regulations the onus is firmly on the operators of sewage treatment works to ensure land application of sludge is safe for the environment.

Jan 1, 1992

By Mould GR

Gas drainage has been practiced for many years mainly for safety reasons in various countries in Europe, in the U.S.A., the U.K. and Japan. Legislation has been developed to control the production, transport- ation and utilisation of methane and associated gases. Gas drainage is now being carried out at some Australian Collieries, but as this is a new venture little specific legislation is available. This paper briefly describes the drainage methods and legislation applied overseas, gives a brief history of gas drainage in N.S.W. and indicates the deficiencies of the present legislation. It outlines the approach to new legislation which will deal comprehensively with gas drainage operations and utilisation in New South Wales.

Jan 1, 1982

It has long been recognised that applications of the Net Present Value (NPV) investment decision making methodology can have serious deficiencies in situations where investment can be delayed and, once made, various options allow increases or decreases in the level of output. NPV valuation can undervalue the project if it does not incorporate future flexibilities or ""options"". It is important to realise that a proper valuation of a project (ie, valuation of its future cash flows) must incorporate an analysis of optimal future decisions involved in managing the project. Current valuation cannot be divorced from a consideration of future decision making. There is now a considerable amount of literature, mainly academic, identifying and exploring ways of remedying these deficiencies in the application of NPV. While the necessity of period by period analysis is sometimes acknowledged, little if any practical illustrative model building has been published to date, aside from algorithms using continuous time stochastic processes which deny access to the uninitiated.

Jan 1, 1994

During the last 20 years, manufacturers of Australian iron have given increasing attention to development of external markets for processed blast furnace slag. Slag has been in widespread use overseas and data on the performance of Australian slag in concrete lave shown it is suitable for that use. Chemical and physical properties of typical Australian slag products including air cooled, granulated and pelletised slag are discussed and compared with local natural aggregates. Special attention is given to pumping achieve- ments with slag concretes and the observed durability of concrete after many years service. More'recent applications for granulated slag as a sand replacement are discussed. It is concluded that'whilst more wide- spread use of slag is possible, the cost of marketing and transporting slag are likely to restrict opportunities unless for local usage.

Jan 1, 1979

Attention is given to three possible alternative structures namely corporate joint venture, partnership joint venture and unincorporated joint venture. A corporate joint venture involves the formation of a separate and distinct legal entity with limited liability. The shareholders of the Company will be the members of the consortium. A partnership joint venture involves the members of the consortium joining a formal partnership. The partners will conduct the business in common with each other and will share the profits and losses of the project activities. The partners will be jointly and severally liable. An unincorporated joint venture is distinct from a partnership. The members of the venture will not be jointly and severally liable. Taxation and accounting aspects are examined and an outline provided of a typical joint venture agreement. The two main advantages of an unincorporated joint venture are considered to be a favourable treatment for income tax purposes and a greater degree of flexibility when compared with the corporate joint venture and the partnership joint venture.

Jan 1, 1983

The global economic, political, sociological, and technical environment has become extremely volatile and unpredictable. Price and demand patterns for fuel and non-fuel minerals have become highly variable. Increasingly militant environmental movements now have a material effect on the price, cost and availability of energy sources and indirectly also on non-fuel minerals.The pace of political change in the U.S.S.R., Eastern Europe, and China has accelerated. Western Europe, Japan, and the U.S. are reacting to these changes with varying degrees of confidence or timidity.Technical and economic developments continue to have a substantial effect on the fortunes of the mineral industries. However, they are increasingly influenced by social and political factors. Supply, demand, and trade patterns in the Pacific Rim Region will continue to be influenced by developments in other regions, such as southern Africa

Jan 1, 1990

By Grainger A, Dawkins G, Lysaght A, Kennedy R

Maintenance management improvement projects were undertaken at several BHP Collieries Division mines pursuing.the objective of achieving better structured maintenance procedures. Efficiently structured maintenance and optimum asset use are interdependent and productivity and computer models assist towards that objective. Definition of aspects of maintenance and analysis of the nature of equipment and materials, workloads and tasks, lead to more effective planning and scheduling of maintenance. The quality, standards and procedures of records must be suitable and adequate for storage and future retrieval. Total Quality Control initiatives and improvement projects even extend into spheres of customer/supplier relationships and problem solving teams as well as the more recognisable standards of management and performance factors in maintenance. All such factors contribute to a Maintenance Management Matrix to provide a better structured approach to economic maintenance management in the capital intensive coal mining industry.

Jan 1, 1991

By Young JA, Rogers G, Bannister S, Edwards SA

Many coal mine operators have responded to economic pressures by massive investment in machinery to reduce unit costs. To sustain the increased production which must justify the expenditure it is essential to know the resource in great detail months or even years in advance of its extraction. The required detail includes variations in composition and any lateral disruptions to the seam which night affect production. As Wilson (1985) has pointed out, a day's production loss can mean half a million dollars income forgone, and an unexpected major fault can mean a shutdown of weeks. Traditionally, seams were probed by surface drilling on (typically) 250 or 500m centres, and by horizontal drilling from sithin'the seam. Core was analysed chemically. The new generation machinery cannot tolerate the risk attendant on such widely spaced sampling, but the costs of much closer sampling rapidly become prohibitive.

Jan 1, 1987

By M A. Ward

On 23 May 1977 the Hon Mr George Gair announced an amalgamation of the present Ministry of Energy Resources, the New Zealand Electricity Department and the Mines Department. Hopefully it will prove to be the solution of many national problems in energy planning and policy making, in energy distribution and use, and energy discovery and production. The name of this new giant is the Ministry of Energy which gives a firm indication of its future direction. For those amongst us involved with mineral energy resources the establishment of this new department must be encouraging. For those amongst us who are involved in non-energy side of the mineral industry it is the very opposite. The loss of the Mines Department a year short of its centenary is a loss for the mineral industry without a doubt - but how much of a loss?

Jan 1, 1977

The Broken Hill (BH) Block contains a wide variety of mineralization, with comrodities including Pb, Ag, Zn, W, Cu, Co and Sn. Much of the mineralization is stratigraphically controlled. Fe, Cu and Co-rich mineralization is dcminant in the Thackaringa Group; Pb, Ag, Zn and W is dcminant in the BH Group and Sn mineralization is present above the BH Group. Some mineralization occurs as concordant syngenetic deposits, but other types have been partly or completely remobilized by metamorphism, magmatic activity or hydrothermal fluids. Almost all of the non-syngenetic mineralization, including stratabound, vein and intrusive-related types, has formed from the "recycling" (remobilization and redeposition) of metals originally deposited with the sediments and volcanics of the Willyama Supergroup.

Jan 1, 1983

The nature of exploration in Australia is reviewed from its inception to the present time. It is seen as consisting of three phases: the first, prospecting; the second and third, mainly company-based activity. The first yielded the discoveries on which the mining industry was originally built. The great recent growth of the industry has been due mainly to the discoveries of the third. The technical, organisational, legis- lative and other aspects are reviewed. The overall result has been a very great increase in the known mineral resources and, viewed collectively, exploration is seen as providing the principal means of assessing, evaluating and building up the nation's mineral resources.

Jan 1, 1973

From statistics on general and electrical fatalities in the Australian mineral industry, it could be said that the present approach to industrial safety is irrational. Deaths are few and decreasing in number, yet spend- ing on occupational safety is large and increasing. State mine safety inspec- torates are being expanded and a National Occupational Health and Safety Commission was recently established. Recent data are analysed in the paper and mining industry fatalities placed in perspective with deaths in other areas. Cost effectiveness of different strategies is discussed along with social implications. Strategies found successful are described and others suggested.,

Jan 1, 1988

The Liddell longwall equipment consists of 118 four leg supports, a shearer and armoured face conveyor of 170mm length. The equipment was supplied to Coal & Allied Operations Pty Limited (Coal and Allied) by Westfalia Australia Pty Limited (Westfalia). The project commenced as a feasibility study in 1983, a proposal was put to the board of directors in March 1984 and a specification distributed. Nine companies tendered for the supply of a longwall face and the supplier was selected from a short list of four companies. At the same time Coal & Allied examined the facilities at Liddell Colliery and decided to upgrade the conveyor belt system to cater for the high production from a longwall face. The surface facilities, transport system, water and electrical supplies to the colliery were also to be upgraded. During the twelve months to December 1985, the colliery was upgraded while the longwall equipment was being manufactured. The manufacturing process involved roof support testing, compatibility testing and finally a build up of 40m of longwall face

Jan 1, 1986

By K H. Esbensen

During the next five years Denmark will implement a significant reduction in the national CO2 emissions to fulfil the Kyoto Protocol. The energy sector is central for achieving this goal and extensive use of renewable energy is the most important single factor contributing to reduce emissions of greenhouse gases. DenmarkÆs renewable energy sources comprise wind energy and biomass. Wood chips and straw are the dominant type of biomass in Denmark. More than 500 000 tons of wood chips are used annually, currently with rapidly growth prospects. This contribution focuses on sampling of wood chips.

Jan 1, 2005

The philosophy of computer control of grinding and flotation at ZC/NBHC is presented. The performance and reliability of the in- stalled systems are discussed.

Jan 1, 1978

The article presents methods of testing and recording of water amount pumped out in surface mining. The authors describe necessary recommendations how to carry out measurements so that one can separate the surface run-off and groundwater inflow from the total inflow. They demonstrate methods of evaluation of these kinds of inflow in open pits when water amount testing is carried out every eight and 24 hours as well as simple methods when only monthly records of water are available. The authors also describe procedures for evaluating the water inflow when an open pit is dewatered gravitationally and measurements in discharge channels are irregularly carried out.

Jan 1, 2003

By Hughson B

The need to prevent the sterilisation of coal stems directly from the fact that it is a non-renewable resource. In N.S.W. a vast amount of coal resource is located under major public utilities such as freeways, railways, stored waters, pipelines carrying gas, water and sewage, and transmission lines. Total extraction has occurred under freeways, transmission lines and pipelines with little or no damage. Where damage has resulted, the cost of restoration was only a small fraction of the value of the coal recovered. However, coal at present is being sterilised and perhaps lost for ever under stored waters and railways. If engineering solutions are available for mining under these improvements economically and with maximum safety, then coal should be extracted and utilised to the benefit of the State.

Jan 1, 1986

By Hutton W

The Argyle Diamond Mine is the first significant diamond producer in Australia. The project has been developed with new concepts in circuit design, process control technology, organisational development and training. After its first year of operation, the Argyle Heavy Medium Separation Plant has proven extremely efficient in recovering diamonds. Apart from cyclone wear, no major problems have been encountered. Ferrosilicon consumption is well below the design level which is a reflection of the sound design of the medium circuit. An Audit Plant continuously monitors the Heavy Medium Separation Plant tailings for diamond loss.

Jan 1, 1987

This paper examines the methods and people required for the evaluation of project or corporate acquisitions. Experience over the past five years has shown that some growth can be achieved by carefully evaluated acquisition of gold projects within regions where the acquiring company has gold processing facilities. Many Western Australian companies have participated in this process and the trend seems likely to continue with a diminishing number of larger producing companies controlling through joint venture or direct purchase of widely spaced ore deposits. In some cases the acquisition may include ore processing facilities, however an increasing number of smaller project acquisitions, involving small open pit gold deposits, which are within trucking distance of the acquiring company's mill. Whilst gold prices remain at the current depressed level we can expect to see this trend continue.

Jan 1, 1989