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Trace-element geochemistry and alteration facies associated with epithermal gold-silver mineralization in the evolving volcanic centre, Rosita Hills, Colorado, USA
By C. J. A. Mcewan, C. M. Rice
The Rosita Hills contain rich, vein- and breccia pipe-hosted precious metal deposits. Volcanic activity occurred in two cycles - an early, mainly andesitic cone-building phase that terminated in the f
Jan 1, 1991
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Ammonia leaching process for Escondida copper concentrates
By W. P. C. Duyvesteyn, B. J. Sabacky
Reprinted with revisions from Extractive metallurgy of copper, nickel and cobalt, volume I: Fundamental aspects. ed. Reddy R.G., Weizenbach R.N. Warrendale, Pennsylvania: The Minerals, Metals and Mate
Dec 1, 1995
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Novel gas hold-up probe and application in flotation
By F. J. Tavera, J. A. Finch
A probe suitable for on-line measurements of gas hold-up in industrial flotation systems has been developed. It is based on an open cell for measurement of slurry-gas conductivity and a novel syphon c
Jun 18, 1905
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Origin of brine inflows at Boulby potash mine, Cleveland, England
By M. A. Leosson, S. H. Bottrell, R. J. Newton
Sylvite at Boulby is mined 1 140 m beneath the sea and the mine suffers from the influx of water. This is of two kinds: persistent flows originating in the Sherwood Sandstone aquifer and entering the
Jun 18, 1905
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Removal of copper from magnetite concentrates by chlorination
Two concentrates from Palabora, in South Africa, containing 0.056-0.068% undesirable Cu and 0.8 or 2.2% Ti, were chlorinated with air:chlorine ratios of 10:1, 15:1 and 20:1 at temperatures between 1 2
Jun 21, 1905
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Recycling of cadmium from domestic, sealed NiCd battery waste by use of chlorination
By A Cox
It has been demonstrated that all the cadmium from spent batteries, typically 4 g per battery, can be recovered by burning polyvinyl chloride waste to yield hydrogen chloride; this reacts to produce
Jun 21, 1905
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Risk model of planned profit from a surface mining venture
By R. A. Halatchev
A risk model for assessment of the uncertainty in the forecasts of the planned profit is developed. It is based on the selling price of the metal recovered from the ore and the production per shift of
Dec 1, 1996
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Recovery of phosphate values from, and flocculation of, phosphatic clay waste from Abu-Tartur, Egypt
By M. K. Abd El-Rahman
A complete chemical analysis of the waste showed that it contains 15.64% P2O5; X-ray diffraction analysis revealed that it is composed mainly of francolite, calcite, pyrite, quartz and dolomite. The p
Jun 21, 1905
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Numerical prediction of the liberation spectrum of a two-phase texture
By G. D. Schena, M Zanin
A numerical approach is presented for predicting the liberation of phases during comminution, with direct calculation of a liberation spectrum giving the fraction of the particulate system in each nar
Jun 21, 1905
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Kinetics of Cu(II) adsorption by Penicillium sp.
By S. P. Mishra, G. R. Chaudhury
The adsorption of Cu2+ ions by Penicillium sp. displayed a dual rate, with an initial faster phase followed by a slower one. The adsorption rate increased with increasing pH due to chemical and bioche
Aug 1, 1995
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Urban explosion: a development that challenges tunnelling technology
By S. Babendererde
The twenty-ninth Sir Julius Wernher memorial lecture of the IMM, presented at Tunnelling '97, London, 2-4 September 1997. The tunnelling industry is well prepared to face the challenge from the popula
Jun 19, 1905
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Strata-bound pyritic copper mineralization on a fore-arc setting in northwestern India: a Proterozoic Besshi-type deposit
By A. D. Mukherjee, H. N. Bhattacharya
Middle Proterozoic sulphide ore mineralisation occurs in isolated blocks of the NE-SW trending Delhi fold belt composed of Delhi Supergroup rocks. The Ajari-Basantgarh-Pipela belt forms part of the lo
Jun 19, 1905
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Practical approach to the solubility of colemanite ores
By S. G. Ozkan
An investigation was carried out into the effect of physical parameters, such as particle size of the sample, residence time, solid/liquid ratio and impeller speed in the flotation cell, on the solubi
Jun 21, 1905
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Flotation of pyrite and arsenopyrite at alkaline pH
By R. J. Gochin, M. A. Diaz
A modified Hallimond tube is described which allows the determination of the ultimate recovery R and the flotation rate constant k in a single, continuous experiment. The range of fine particles which
Apr 1, 1995
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Geopressure zones as proximal sources of hydrothermal fluids in sedimentary basins and the origin of Mississippi Valley-type deposits in shale-rich sequences
By A. D. Fowler, M. T. Anderson
A phenomenological model is presented that relates Pb-Zn mineralisation to proximal geopressure zones. Typically, geopressure zones (GPZ) consist of masses of undercompacted sediment encapsulated with
Jan 1, 1991
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Some effects of earth-movement on the Coal-Measures of the Sheffield district (South Yorkshire and the neighbouring parts of West Yorkshire, Derbyshire, and Nottinghamshire), part II, fig. VII: Geological map of the Sheffield district
By Fearnsides W. G.
The map shows the sites of collieries and important boreholes in the district, with approximate underground contours of the pre-Permian surface of the Coal-Measures and of the Barnsley Bed
Dec 1, 1916
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Subject index
Jan 1, 1984
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Exploration methods for nuclear waste repositories or mineral deposits - from source to sink, where's the front?
By M. J. Russell, W. E. Stephens, D. B. Mohamad, A. B. MacKenzie
Redox front processes in rocks are important in the context of both radioactive waste disposal and the development of orebodies. Results are presented from a study of the distribution of uranium and t
Jan 12, 1992
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Notes on the history of the safety-lamp
By Hardwick F. W., O'Shea L. T.
The survey covers: coal-mine lighting prior to the invention of the safety-lamp, including candles, the flint-and-steel Spedding mill, and mirrors; the growth in knowledge of firedamp; the Society in
Dec 1, 1916
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Some effects of earth-movement on the Coal-Measures of the Sheffield district (South Yorkshire and the neighbouring parts of West Yorkshire, Derbyshire, and Nottinghamshire), part II
By Fearnsides W. G.
The second part of the paper, presented at the Midland Institute of Mining, Civil and Mechanical Engineers' general meeting held in Doncaster on 27th May 1916, addresses the post-Carboniferous and pre
Dec 1, 1916