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Bohmke reef: platinum-group element mineralization associated with C1d chromitite of the Great Dyke, Zimbabwe
By S. J. Parry, D. M. Evans, D. L. Buchanan
The reef is a PGE-enriched sulphidic zone, stratigraphically associated with and overlapping the C1d chromitite layer, that was formed by magmatic processes at the 1e-1d subunit boundary. Two distinct
Apr 1, 1996
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Electrochemical removal of lead from aluminium using fused salts
By F. Tailoka, G. Zhao
Pb is an unwanted impurity in Al for which there is no established method of removal. As it interacts strongly with alkali metals, separation was achieved by adding Na or K to molten Al at 953-1 003 K
Apr 1, 1995
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Preliminary modelling of groundwater inflows at Gays River mine, Nova Scotia, Canada
By R. Macleod, G. G. Bursey, T. R. C. Aston, J. E. Gale
In 1991 the problems of water inflow at the mine were addressed by a three-phase study. A three-dimensional finite-element computer code, CFEST (Coupled Fluid, Energy and Solute Transport), was used t
Jan 12, 1993
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Extraction of rare earths and thorium from monazite by chlorination with carbon tetrachloride
By G. Adachi, K. Machida, T. Ozaki, K. Murase
The chlorination rate with CCl4 was unexpectedly slower than carbochlorination using chlorine under the same reaction conditions. Chlorination with CCl4 was topochemical and the amount of monazite rea
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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The suppression of dust in coal-mines of Great Britain -thirty-second report to the committee on the control of atmospheric conditions and spontaneous combustion in mines-
By J. Ivon Graham, T. D. Jones
This paper presents methods in use in British coal-mines for the suppression of dust. While the effect of present-day treatment will not be apparent for several years, in pits in South Wales, concentr
Jan 1, 1947
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New generalised model of observed ore value distributions
By H. S. Sichel, W. J. Kleingeld, C. E. Dohm
A model of ore value distributions is presented that is the culmination of a statistical approach rather than simply a model that has been successfully applied to the evaluation of ore reserves. Detai
Aug 1, 1995
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Effect of charge moistening on alkali roasting of chromium oxide
By A. K. Tripathy, P. K. Pattnayak, H. S. Ray
The effects of water addition on the solid-state reaction between Cr2O3 and Na2CO3 at low temperatures (up to 873 K) were investigated to determine its possible influence on the reaction rate and the
Jun 19, 1905
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Automated gold search and applications in process mineralogy
By L. J. Cabri, J. M. D. Wilson, R Lastra
An image analysis program can search for gold minerals in polished sections by scanning about 100 x 100 back-scattered electron images at a magnification of x400, allowing gold grains as small as 1 mi
Jun 21, 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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Potential for epithermal gold mineralization in east and central Sutherland, Scotland: indications from River Brora headwaters
By J. Crummy, I. K. Anderson, A. J. Hall, R. S. Haszeldine
Bedrock gold mineralisation has been located in association with an extensive float train 25 km west of known alluvial gold. It is in the form of open, matrix-supported breccias comprising pyritic qua
Jun 19, 1905
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Analaysis and management of financial risks arising from ground conditions
By I. L. Whyte
apparent density and drag coefficient of porous ores on
Apr 1, 1995
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Extraction of yttrium from a Brazilian xenotime concentrate by sulphation and water-leaching
By T. Ogasawara, J. P. Barbosa, A. J. Monhemius, F. T. Da Silvia
A thermodynamic analysis of the sulphation of rare-earth phosphates and the water-leaching of rare-earth sulphates was used to guide experimental work on the sulphation and leaching of concentrates fr
Jun 19, 1905
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Freeze-sampling method of collecting drainage sediments for gold exploration
By J. S. Coats, G. E. Patts, N. Hughes
Conventional sampling methods are known to suffer from the variable loss of fine gold by elutriation. Freeze sampling yields representative and quantitative data that, when combined with information o
Jan 1, 1991
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Design methods for controlled blasting
By O. Dojcar
Equations for calculating the parameters of controlled blasting (burden and spacing of boreholes and weight of the bottom charge) are derived and analysed on the basis of empirical values and made mor
Dec 1, 1996
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Residual coal mining subsidence - some facts
By C R. Ferrari
Residual subsidence is generally accepted as being about 5% of the total subsidence occurring within 12 months of all mining finishing. This paper looks at five case studies from different parts of th
Jan 7, 1997
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Thermodynamics of oxygen in liquid copper, lead and copper-lead alloys
By J. H. E. Jeffes, K. T. Jacob
Solid oxide galvanic cells, of the type: Pt,Ni-NiO | Solid electrolyte | O(metal),Cermet,Pt, were used to measure the activity coefficient of oxygen in liquid Cu at 1 100 and 1 300°C and in Pb at 1 10
Dec 1, 1971
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Risk management for mining projects
By T Atkinson, A Cobb, R AJIington
Risk management is concerned with the whole spectrum of financial, geological, engineering, legal, governmental, social and occasionally ethnic issues, concerned with mining projects. The inherent ris
Jan 5, 1996
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Application of physical modelling and particle flow analysis to evaluate ore-pass design
By M. J. Beus, B. Stewart, S. Iverson
Ore-pass hazards are a significant safety problem in US underground metal mines. From 1975 to 1995, nearly 75% of injuries during pulling or freeing of ore-pass chutes were related to falls of broken
Jun 19, 1905
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Bioleaching of iron-stained sands
By A. F. Neil, A. S. Bahaj, P. Watkins, P. M. Hyslop, C. E. Kirby, P. A. B. James
The results of initial work indicate that for 3 of the 5 quarry sands bioleaching reduces the iron oxide content to a commercially acceptable 0.035 wt% Fe20 3, although the time taken to achieve this
Jun 18, 1905