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Precipitation of inorganic compounds or metals from aqueous solutions can either be physical (crystallisation) or chemical in nature. Chemical processes are varied; they may be due to hydrolytic action, due to ionic interaction, or due to reduction (ie transfer of electrons). Transfer of electrons in reduction processes may take place homogeneously or heterogeneously. In the first case it may be ionic or nonionic in nature. Heterogeneous processes may be electrochemical or electrolytic. Examples of interest to hydrometallurgy are given.

Jan 1, 1993

Operation of a pilot heavy medium separation plant allows flexibility of operation not normally possible in an operating plant. Much useful data can be obtained, although some limitations apply. Projects carried out at AMDEL have included HMC separations at 1.5 to 3.6 specific gravity, comparative operation of HMC and DWP separators and the use of fine feed and product screens. Investigations of this type have provided a considerable amount of information on HMS plant performance and characteristics under a wide range of operating conditions.

Jan 1, 1987

A mineral exploration manager's prime function is to provide a frame- work within which new mine production can be achieved. As part of this framework, the manager should know his employerb future requirements, and should direct exploration towards those particular mineral commodities which indicate satisfactory growth in consumption and price. Selection of these commodities can be assisted by studies of world reserves, and long term trends in price and consumption. Exploration planning is most efficient with an assured and reasonably uniform supply of funds.

Jan 1, 1980

Extensive personal experience in the USA and Australia has shown that Australians working in suitable work environments are capable of world-class performance. To build such work environments, mining leaders need to ditch two common management approaches that have not succeeded. Firstly, stop relying on traditional methods of trying to change people's behaviour simply by using communication alone to change attitudes and then change behaviour. Analysis of human behaviour explains why this approach fails in all industries. Secondly, stop trying to improve productivity by just running harder and increasing capital investment. Understanding work processes explains why this approach has limited success.

Jan 1, 1995

By Dorricott M. G

Ballarat Goldfields NL is developing an exploration decline at Ballarat East using a Mitsui Miike S-125 roadheader. To-date, 530 in of advance has been achieved at an average rate of 16.1 m/week. Roadheader availability has averaged 94.3 per cent, and pick consumption has averaged 0.016 per m. Ground support has involved pattern rockbolting with split sets, 100 mm thick fibre reinforced shotcrete, and steel sets as required. The slower than expected advance rate has mainly been due to difficult ground conditions. It is expected that a further 970 in of decline will be mechanically excavated before a drill and blast system becomes more economical.

Jan 1, 1995

Various aspects concerning gold are mentioned below. These have no common theme but suggest points of interest any one of which, if warranted, could lead to development later and elsewhere. 'High level' auriferous gravels The gold deposits of Victoria are commonly classified as being either primary or secondary. Most primary occurrences comprise gold present in quartz reefs, together with other lode-like occurrences in which gold is associated with various sulphides, with or without quartz. Secondary occurrences are derived by physical release of primary gold and subsequent concen- tration of it as a constituent of sediments. Secondary gold deposits may be themselves eroded so leading to third or even fourth generation gold.

Jan 1, 1982

Coal Preparation Research at Turkish Coal Enterprises (TKI)

Sep 13, 2010

Removal of Thiocyanate from Solutions by Precipitation

Sep 13, 2010

Frothing in Seawater Flotation Systems

Sep 13, 2010

Distribution of Settling Velocity of Irregular Particles and its Effect on Jig Separation Efficiency

Sep 13, 2010

Temperature Sensitive Polymers as Efficient and Selective Flotation Collectors

Sep 13, 2010

Recovery of Rhenium from Mineral Raw Materials of Kazakhstan

Sep 13, 2010

Bubble Load Measurements in Flotation - A Critical Review of Current Practice

Sep 13, 2010

Determination of Porosity and its Influence on Specific Surface

Sep 13, 2010

Comparative Studies on Balls Versus Spheroidal Tetrahedrons Working Media to Ore Grinding in an Industrial Drum Mill

Sep 13, 2010

Estimating Breakage of Fine Ore Particles by Media in a Small Ball Mill Using DEM

Sep 13, 2010

A New Technology of Applying SLon-2500 Magnetic Separator to Recover Iron Concentrate from Abandoned Tails

Sep 13, 2010

Mechanism of Modified Sodium Silicate on Fluorite Ore Flotation

Sep 13, 2010

Integrated Utilisation of Desulfurisation and Skimming Slag

Sep 13, 2010

Fine Coal Evaluation by Gravity Methods

Sep 13, 2010