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Methane predrainage from coal seams in the Western Area of the U.K. has been practiced over the past decade. The differing reasons for the practice include the controlling of gas emission rates in coal headings required to win out coal faces and also the need to control the gas emission rates in the roadways of retreat faces in order to comply with the statutory requirements. There are some similarities with predrainage experience in the Bulli Seam NSW. The several case studies highlight the varying conditions in the Western Area coalfield where the use of predrainage was Required.

Jan 1, 1982

Until early-1997, Mount Isa Mines Limited (MIM) generated electrical power for most of north-west Queensland. The discoveries of many new orebodies in the region meant the inevitable increase in power generation requirements for the new mines. In addition, the expansion at Mount Isa itself meant that MIM had to invest in new generating capacity or utilise the existing generating plant more effectively. Using its generating plant more effectively required MIM to undertake rigorous energy management within its own operations. A personal computer based system with a wide area network was installed as the basis for energy management. The result was that energy consumption was reduced, the need for additional generating plant was curtailed, and capital outlay for the generating plant that was required was delayed. As a direct result of energy management, carbon dioxide emissions were reduced substantially.

Jan 1, 1998

By Napier-Munn T. J, Morrison R. D, Moloney M. J, Corrans I. J

A dynamic simulator for CIP / CIL gold recovery plants has been developed at the Julius Kruttschnitt Mineral Research Centre within a collaborative, industrially - funded AMIRA project and with the participation of the Western Australian School of Mines. The simulator incorporates kinetic models for the leaching of gold from ore and its adsorption onto activated carbon, and the residence time distributions of the leach liquor, pulp solids and carbon in the circuit. Features of the simulator include the effects of gold loading distributions on both the ore and carbon on reaction rates, and the difference in residence time distribution between the leach liquor and pulp solids. The simulator allows for the estimation of kinetic model parameters from full scale applications, as well as some scale - up of parameters from laboratory batch tests. The laboratory tests were conducted at the WASM as part of the collaborative research project. The simulator can operate in both steady - state and dynamic modes, and has potential applications in design, optimisation and control of CIP / CIL plants.

Jan 1, 1991

The changing characteristics of raw materials has highlighted the limitations that conventional vibrating screens have in the handling of fine wet sticky materials. These' limitations have led to the development of a totally new concept of screening, the Rotating Probability Screen. In order to illustrate the practical benefits to be gained by the extraction of fine materials ahead of subse quent processes particularly in the coal industry, the experiences gained in Ro-Pro installations in America, Australia, Europe and Britain are drawn upon.

Jan 1, 1984

By Alford R. A

The causes of the loss of heavy mineral from mineral sands wet concentrators were identified through detailed surveys of two such concentrators. It was found that tray and spiral sluices preferentially lost elongated panicles, but panicle size had little effect on loss. Recovery was shown to increase with panicle density. The major influences on the recovery efficiency of individual concentrating devices (stans) were feed rate and feed grade, recovery increasing with decreased feed rate and with increased grade. Uneven distribution of total solids and heavy mineral to individual stans contributed to losses through the corresponding effects in feed tonnage and grade. Computer simulation demonstrated that significant recovery improvements could be obtained by appropriate adjustment of splitters to optimise the characteristics of internal plant flows.

Jan 1, 1991

The Olympic Dam smelter utilises Outokumpu Oy, flash smelting technology to produce blister copper direct from high grade copper concentrate.This paper describes the unit processes involved, including filtering/drying, materials handling, smelting, gas/dust handling, waste heat recovery, sulphur fixing, anode refining and casting.

Jan 1, 1993

By Fabjanczyk M. W

The design of underground mine roadways (tunnels) requires a detailed understanding of the in situ stressfield, the rock failure modes, the performance characteristics of reinforcement or support members and assessment of the stress state about the roadway. Definition of these factors, together with monitoring of roadway behaviour during both development and extraction operations, allows rational design procedures to be undertaken.The design approach utilised computational techniques to simulate the behaviour of the strata about the opening for a range of anticipated stressfields and various reinforcement options. Field validation studies are conducted to confirm the design expectations.

Jan 1, 1993

The Olympic Dam Mining Operation involves the supply of some 2.2 million tonnes per annum of ore feed for the metallurgical plant. To achieve this approximately 9 km of tunnels are developed per year to gain access to the long hole open stopes that supply the majority of the production tonnes.Vast amounts of data are produced in the mining activity from the geology, mine design, scheduling, surveying, shift reporting through to the statistical reporting and analysis of the performance of the mine activities. Care must be taken when obtaining the data to maximise the usefulness of the data to other users so not to impose constraints or additional processes on future users.

Jan 1, 1992

In 1874 a stockman, JE Wright of Foxlow Station, recognised copper mineralisation when he was about 12 kilometres south of the station. The find was on the banks of the Molonglo River. Several small mines were soon operating along the ridge above the river, and the village of Captain's Flat was established.One mining company established in the 1880s was Lake George Mines. It's name was to remain synonomous with the name of the town until mining and treatment ceased on 11 March 1962.

Jan 1, 1993

By Storey AG

Following initial plant scale work on the development and performance of 'spray' oil lances, a full scale room temperature model of the blowpipe-tuyere region of a blast furnace was built to study the basic aerodynamic features of auxiliary fuel injection procedures. Mobilwax 2305 was used as a substitute for Bunker C oil fuel in view of its similar physical properties and the fact that the atomised droplets could be frozen in flight and size, distribution analyses made for various operating procedures. It was shown that secondary atomisation processes far outweighed the importance of any primary atomisation procedures in determining mean Sauter Diameters particularly at high windrates typical of current blast furnace technology. It was also found that good spray dispersions across the blow pipe could only be obtaind for liquid fuels and that the lateral rate of spray dispersion was substantially enhanced by primary atomisation procedures. Mean particle diameters of sprays were found to be predictable on the basis of elementary stability theory and fell within the size range necessary for good combustion at all liquid fuel rates studied. The possible effects of high oil injection rates on flooding phenomena in the furnace bosh were considered. Comparisons show that high oil rates can lead to significant increases in the hanging factor (e.g. 'V 10% at 135 kg oil/thm) owing to increased gas flow rates/thm resulting from the presence of hydrogen.

Jan 1, 1975

In October 1993 it was decided to undertake the fourth phase of mining at Big Bell. This decision followed the exhaustion of open pit reserves in January 1993. Two stages of mining were proposed for the new underground mine. The initial stage would mine the remnant ore, consisting of the rib and crown pillars and lower grade ore on the hangingwall and footwall side of the old open stopes, which were mined from the 1930s to 1950s. Most of the old open stopes were backfilled with either deslimed mill tailings or development mullock, both of which were economic to recover. However, the mineable ore from this resource was difficult to evaluate. The second stage focused on mining ore outside the remnant areas and was initially proposed as a Core and Shell method under a caving hangingwall. This method has since been superseded with sublevel caving, in part due to the very high and deviatoric stress conditions encountered at Big Bell and the relatively long mining cycle required for open stoping. The problems and challenges discussed in this paper will cover the identification of remnant ore reserves, dewatering the old workings, and remnant mining.

Jan 1, 1998

The Rehabilitation of Acid Mine Effluents and Toxic Heavy Metal Pollution, Emanating from Gold Mines in South Africa

Sep 13, 2010

Study on the Recovery of Zinc Minerals from the Tailing of a Lead and Zinc Mineral Processing Plant

Sep 13, 2010

In Situ Bioremediation of a Heavily Polluted Alkaline Soil in a Uranium Deposit

Sep 13, 2010

By Borkin AD, Yemelyanov MF, Otrozhdennova LA, Malinovskaya ND, Nechay LA, Koltunova TY

The results of investigations of reagent regimes and flotation machines to decrease the losses of valuable components in both coarse and fine particle classes during non-ferrous metal dressing are considered.

Jan 1, 1993

By Markic S, Subelj A

Long-term plan for lignite mine Velenje has been made by using technical parametrisation method where the basis for periodical, middle- term and short-term plans as well as for scheduling has been already fixed. For a certain time period a plan

Jan 1, 1998

Aspects and anomalies in the present Standard Specifications for Blended Cements which may have operated in Australia against the development of the greater use of Slag Blended Cements are noted. Estimates of slag and ash usage in Australia are given and the need for further research with local materials stressed.

Jan 1, 1979

Current NSW Government policy requires searching for more than just minerals during an exploration program û add endangered fauna and archaeological relics for a start.

Jan 1, 1995

Thank you for that introduction and especially thank you to the organisers for inviting me. I've had a considerable interest in this area and I've had the advantage of an education from Neil on the subject of offering documents as a result of our collaboration together on the Securities Information Review Committee.

Jan 1, 1989

The recommendations of a recent American report on "Better contracting for Underground Construction" are considered in relation to Contracting practices on major Australian projects by representatives Of the "classical trilogy" - the Owner, Engineer and Contractor.

Jan 1, 1976