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By N. B. Devi

The extraction of Cu(II) from HCl media using Cyanex 923 in kerosene was investigated. The effect of shaking time, aqueous phase acid concentration, extractant concentration, chloride ion concentration, various metal ions (Mn2+, Mg2+, Fe2+, and Ni2+), and temperature on the extraction were studied. Using 0.1 M Cyanex 923 the extraction of Cu(II) was 6.7 per cent from 3 M HCl, which increased up to 78.5 per cent with 6.5 M HCl and then decreased due to acid extraction by the extractant. The maximum extraction (97.5 per cent) was obtained with 1 M Cyanex 923 from 5 M HCl solution. A mathematical model has been developed to describe solvent extraction equllibria over wide ranges of concentration of extractant, acid, and chloride ions. The composition of the extracted species has been predicted on the basis of slope analysis results and extraction equilibrium modelling. The negative values of enthalpy change and entropy change confirm the exothermic formation of the extracted complex.

Jan 1, 2012

By H. Von Michaelis

The world is rapidly becoming more ?green? i.e. energy conscious. Since mining and mineral processing are massive energy users, the mining industry is seeking ways to reduce its energy footprint. In mining and mineral processing operations, energy is often the most expensive cost item. Comminution, i.e. grinding, is frequently the most energy-intensive step between mine and metal. High pressure grinding rolls (HPGR) are being installed in a rapidly growing number of ?hard rock? mineral processing operations. In the energy conscious cement industry, HPGR grinding has been standard practice for decades. HPGR is known to be energy-efficient; the question is how energy efficient? How can the energy efficiency of HPGR be enhanced? This paper reviews recent HPGR applications for the processing particularly of copper, gold, platinum, PGM-Ni-Cu and iron ores. HPGR technology is discussed with respect to energy efficiency. The harder the ore the greater the energy savings are likely to be. Typical energy savings of 10?20% can be expected when installing HPGR vs. a SAG mill. Wipf(2005) showed why conventional Bond Work index tests on HPGR product is likely to under-estimate the energy savings that can be achieved by installing HPGR. Energy efficiency of HPGR is, however, ore-specific. The biggest energy savings of HPGR tested thus far is 9.5 kWh/tonne claimed for Vista Gold?s Mt. Todd gold ore from Western Australia, a savings of over one-third of conventional SABC comminution energy. Several commercial scale iron-ore pellet feed plants install HPGR for fine-grinding of concentrate to increase the surface area of pellet feed in a manner that reduces overall energy consumption. Energy-consumption in comminution is, however, only part of the energy savings benefit story. HPGR typically also reduces the amount of steel lost through wear of mill liners and media. Marsden(2008) showed that when the energy that would have been consumed to produce the steel that is saved by applying HPGR is factored in, then the overall energy savings of HPGR is considerably greater. Johnson et al.(1988, 2005) tested HPGR in a flowsheet in which energy savings of around 50% can be expected if HPGR product screen oversize is recirculated to the HPGR. Innovative flowsheets have been proposed by Rule et al.(2008) and by Morley (2008) which are expected to result in significantly increased energy savings. HPGR applied in flowsheets in conjunction with coarse ore separation devices, e.g. ore sorting or DMS to remove barren waste from HPGR feed promises significantly greater energy efficiencies. Fine-grinding and ultra-fine grinding of ore or concentrates in conventional ball mills results in energy consumptions that increase exponentially with product fineness. Wipf (2009) presented a flowsheet in which he proposed the installation of HPGR ahead of the Aerosion ?Disintegrator? for ultra-fine grinding of ores and/or concentrates. This dry grinding arrangement is expected to achieve ap80 = 7 µm using up to 100 kWh/t less energy than could be achieved by wet ball milling. Using conventional comminution, an ore might require grinding to p80 = 45µm (? 325 mesh), for example, to liberate the valuable components, e.g. magnetite, from gangue, e.g. silica. Inter-particle comminution in HPGR may break some ores along grain boundaries thereby liberating valuable minerals from gangue at a much coarser particle sizes. Early magnetic separation rejection of silica gangue liberated from magnetite by HPGR at coarser grain sizes could further reduce downstream comminution energy consumption.

Jan 1, 2009

On Friday, 18th April, 1986, Stefen Kenneth de Kok passed away peacefully at his home in Johannesburg after a short illness. New President of FSPE Mr R.G. (Bob) St Leger took office as President of The Federation of Societies of Professional Engineers on 1st July, 1986.

Jan 1, 1986

A banquet, attended by 467 members and visitors, was held at the Wanderers Club, Johannesburg, at 8 p.m. on Friday, 21st March, 1969, to celebrate the 75th Anniversary of the founding of the Institute. Introduction of Dr Carel de Wet R. C. J. Goode (President) Dames en here: Ons het 'n aantal vooraanstaande gaste in ons midde vanaand en mnr Maxwell sal u later meer van hulle vertel. Dit is my aangename plig om u voor te stel aan sy Edele, die Minister van Mynwese, van Beplanning, en van Gesondheid, Dr de Wet en sy gade, mev de Wet. Sy Edele Dr de Wet het geen bekendstelling nodig nie-alhoewel hy ons minister vir slegs die afgelope twee jaar is, het hy reeds talle funksies van ons Mynbedryf bygewoon en het baie vriende gemaak onder ons. Hy het homself baie bemind onder ons gemaak toe hy Wes-Driefontein onlangs besoek het om hulle ondersteuning en aanmoediging aan te bied in hulle uur van nood. The Honourable Dr de Wet was born in the Free State. He is a grandson of that very famous general Christiaan de Wet, who caused so much pain to the British forces and for so many months so successfully eluded them in the Transvaal and Orange Free State. He was educated at both the Pretoria and Witwatersrand Universities. He first practised medicine at Boksburg and then moved to Vanderbijlpark, so you see he has an early association with gold mining on the Witwatersrand, and in moving to the Vereeniging-Vanderbijlpark district he became closely involved in our coal mining and metallurgical industries. South Africa's first steel was poured from a l0-ton open hearth furnace belonging to the Union Steel Corporation in Vereeniging in 1913. Dr de Wet has been mayor of Vanderbijlpark and for several years has been their member of parliament. More recently, the Honourable Dr de Wet has filled with great honour that most important office of Ambassador for the Republic of South Africa in London. At present he wears two hats, in that he is Minister of Planning and of Health, but more important is his cloak, that of Minister of Mines, which I trust offers him the greatest comfort. To fulfill these three arduous tasks must demand of him a terrific devotion to duty, and in doing this he carries on that loyal tradition of service to his fatherland so evident in his grandfather. Dames en here, dit is vir my 'n groot genoeë om Sy Edele Dr de Wette vra om 'n heildronk in te stel op die Instituut vir Mynwese en Metallurgie. Toast to the Institute of Mining and Metallurgy Dr the Honourable C. de Wet (Minister of Mines): Mr President, ladies and gentlemen, Mr President you have introduced me gracefully to this distinguished company and I am appreciative of your remarks. I am fully conscious of the responsibilities that devolve upon me as Minister of Mines in a country where mining makes so vital a contribution to economic progress and development and has, in fact, laid much of the foundation on which our present proud edifice is built. The achievements of the mining and metallurgical industry in its diversified activities arouse feelings equivalent to paternal pride, but let me speedily add that in considering any family relationship that may exist, the Minister of Mines should not be regarded in the role either of a fairy godmother or an indulgent father.

One of the largest and most exciting cast murals in the world has been erected in Johannesburg, forming the focal point of the large atrium in the new headquarters complex for Johannesburg Consolidated Investment Company Limited (JCI). Known as 'Rockface', this is waterwal1 structure formed of cast stainless-steel panels

Jan 1, 1986

By Franz E. Pawlek

Synopsis This is a summary of investigations in the field of pressure leaching carried out at the Institute for Extractive Metallurgy of the Technical University of Berlin-West during the last seven years. The efficient dispersion of gas in a liquid and its dissolutions as well as the events at the phase boundary when leaching ZnS are reported. At the end two examples are given for the use of pressure leaching in the processing of smelter by-products. INTRODUCTION About 20 years ago, experiments were independently started in Canada and in Berlin on the subject of dissolving sulfidic ores without preliminary treatment by means of leaching under increased oxygen pressure. In Canada ammoniacal solutions were mainly employed, and F. A. Forward and his co-workers were successful in applying this process on a large industrial scale1, 2. This process is used in Fort Saskatchewan to produce about 15,000 tons of Ni per year. In Berlin, investigations were started on leaching with acid solutions3, 4. This process had also been used on a large industrial scale in the D.S.A., but the choice of unfavourable working conditions led to great difficulties, and to giving up this process for industrial use. Later on in Berlin work was carried out especially on the kinetics of pressure leaching 5, 6, 7, 8, 9 and its applications to the processing of smelter by-products, in particular of mattes and speisses10, 11, 12, 13, 14. The dissolution of ores and by-products can be subdivided into four steps: 1. the efficient dispersion of the gas, so that its dissolution occurs over as great a surface area as possible, since only the dissolved oxygen reacts with the solid, 2. the suspension of the solid, so that the entire surface can take part in the reaction, 3. the phase boundary reaction, 4. the removal of the reaction products. The first two steps belong to the field of process engineering and will be discussed from this point of view. The aim of these experiments15 was to find out first of all the limits of efficiency of self-sucking stirrers in solutions of low viscosity with regard to the mass transfer. In addition, the effect of ultrasonics in the same reaction system was studied. The experiments were carried out in a lucite container as shown in Fig. 1. Four baffles of 0.1 d width were in the stirring vessel. The height of these baffles was adjustable. For every experiment one litre of liquid was used. An infinitely variable direct current motor, which was fixed with a hollow shaft, served as the driving power for the stirrer.

The following corrections should be made to pages 346 and 347 of the December 1981 issue (vol. 81, no. 12) in the paper by O. L. Papendorf entitled 'A note on rapid determinations of present values in the presence of growth and inflation'. (1) Equation (2) on page 346 should read as follows:

Jan 1, 1982

By El-Sayed M. Sherif, J. D. Comins, Erasmus R. M.

Corrosion of copper in aerated acidic chloride pickling (0.5 M HCl) solutions and its inhibition by 3-amino-1,2,4-triazole-5-thiol (ATT) have been investigated using electrochemical techniques and weight-loss measurements, along with Raman spectroscopy. Electrochemical measurements for copper after varied immersion periods of 0, 24 and 48h showed that the presence of ATT and the increase of its concentration significantly decrease cathodic, anodic, corrosion (jCorr) currents and corrosion rates (KCorr), as well as the dissolution currents at 300 mV vs. Ag/AgCl, while increase polarization resistance (Rp), degree of surface coverage (?) and inhibition efficiency (IE%) to a great extent. Weight-loss measurements after different immersion periods of 6 ~ 48h revealed that the dissolution of copper decreased to a minimum and the corresponding IE% increased with ATT concentration increases. The detection of ATT molecules on the copper surface by Raman spectroscopy indicated that inhibition of copper corrosion is achieved by strong adsorption of ATT molecules onto the copper surface. Aerated acidic pickling solutions; 3-Amino-1,2,4-triazole-5-thiol; Copper corrosion; Corrosion inhibition; Raman spectroscopy

Jan 1, 2006

1. Publications of The Institute of Metals The following publications are available from The Institute of Metals, Sales and Marketing Dept, 1 Carlton House Terrace, London SWIY 5DB, England. . Intermediate temperature embrittlement processes in duplex stainless steels. 1990. £15.00. This is a special issue of Materials Science and Technology containing the full proceedings of the international workshop held in Oxford in August 1989. . Worked examples in dislocations, by M.J. Whelan. 112 pp. £16.00. This is a concise introductory text that examines aspects of the theory of dislocations. . Introduction to creep mechanisms, by B. Wilshire. 1991. 112 pp. Well-supported by diagrams and illustrations, this concise introductory textbook allows students and engineers to increase their knowledge of modern theoretical and practical approaches to creep and creep fracture. . Powder metallurgy. A series of lectures. 1991. (Looseleaf binder). Originally published in 1986 by the Fachverband Pulvermetallurgie, this course book provides an introduction to PM technology. Divided into eight thematically distinct sections, it also contains numerous illustrations and tables, as well as 150 slides. The concluding section contains an extensive reference list to the literature for readers wishing to study topics in greater detail.

Jan 1, 1991

By J. G. Ferguson, R. E. Burnton

The nature of the coal and of the roof in No. 3 seam at Coal brook Collieries is such as to preclude the use, during bord and pillar mining, of conventional mining equipment that employs cutting and blasting in its production cycle. Continuous mining machines of the borer type, operating within a mining height range of 1,9-2,3 m, have been successfully employed in No. 3 seam since 1957.The experience gained with this type of equipment, the operational methods adopted, and the results achieved are described. The ventilation method used to eliminate the dust and methane hazards created by this type of equipment is stressed. The limitation on the minimum mining height that can be obtained with the borers in use has lead to the recent introduction of a Rotary Drum type of continuous mining machine. This equipment is capable of operating in areas where the seam width decreases to 1,5m. The production potential of the machine has been proved. The roof conditions created by the cutting action of the Rotary Drum type of miner are not considered satisfactory and a modified drum head profile is to be tried.

Contribution by G. Narsimhan It was with much pleasure that I went through D.F. Malan's excellent paper. The following explanatory and critical note has been the result of my deep study of the paper. Although by qualifications and experience I have been a chemical engineer, involved over four decades with problems in the modeling and simulation of transport-limited (heat and mass) chemical reactions in multi-phase systems, I have of and on interested myself in challenging problems in extractive metallurgy. This is the first time I have veered of to continuum mechanics, at the age of 71! Author's reply. I thank Professor Narsimhan for his extensive contribution to the paper. It provided me with the stimulus to derive an extended model. However, there are some inaccuracies in his arguments that need further discussion. Professor Narsimhan's main concern is that there is not a good enough fit between the derived viscoelastic Kelvin model and the experimental data supplied by Güler1 (see Figure l1 on page 218 of my paper). I will therefore explain the choice of a viscoelastic model in more detail and also make specific comments on the arguments given in his contribution.

Jan 1, 1996

By G. F. Balderson

In response to the written contribution made by G. J. C. Young to the above paper, I would like to make the following points. Paragraph 1 The build-up of oxidized coatings on cone surfaces has not been a problem in other applications similar to that at President Steyn. The following companies have commented.

Jan 1, 1982

By J. Nell

Heavy mineral deposits often contain relatively high levels of radioactive elements (thorium and uranium in particular).It is difficult to obtain clean separation of ilmenite and monazite (the main impurity mineral containing radioactive elements), and physical intergrowths of the two minerals are, in fact, not uncommon. As a result, ilmenite concentrates obtained from such deposits often contain high levels of thorium and uranium. Because of the large negative free energies of formation of ThO2and U3O8boththorium and uranium report to the slag during smelting and if an ilmenite concentrate contaminated with monazite is used to make high titania slag, the concentrations of these elements in the slag end up about 40% higher than in the ilmenite feed. Previous work, patented by RGC Mineral Sands Limited, and subsequently confirmed by Mintek, showed that radioactivity may be reduced by roasting an ilmenite concentrate with borax at 1000°C to 1100°C and leaching it with hydrochloric acid1. It is evident that the cost of an ilmenite roast/leach process will be high and there may be economic benefits in removing the radioactive elements from the slag instead (the volume of slag to be treated is smaller than the volume of ilmenite feed). To remove radioactive elements from the slag it is necessary to know how these elements occur in the slag. Inother words, the distribution of uranium and thorium between the various oxide, silicate and metallic phases in high titania slag must be determined. Once the deportment of thorium and uranium between the various phases ha sbeen determined, an appropriate process for slag purification can be developed. Test samples High-titania slag was prepared in a pilot-scale DC furnace from ilmenite concentrates with different levels of uranium and thorium. Subsequently, ten slag samples representing a range of compositions were selected for bulk chemical analysis, scanning electron microscopy and micro-analysis. The samples were crushed to a maximum particle size of 1 mm and from each sample a 20-kg batch was riffled out for analysis. Bulk chemical composition Chemical compositions of the samples selected for test work are given in Table I. TiO2, Al2O3, SiO2, MgO, MnO, FeO and V2O5were analysed by ICP-OES, Na2O, CaO andCr2O3by atomic absorption spectroscopy and U and Th by XRF (the XRF detection limit for U and Th was around 4 ppm). The ?B? series has a higher silica content than the others as a result of small silica additions that were made during smelting. All samples have elevated alumina levels as a result of furnace refractory contamination during smelting. As expected, there is an inverse relationship between the concentrations of TiO2and FeO in the samples (Figure 1).The TiO2and FeO levels are similar to the levels found in industrial slags2. Extreme conditions of reduction under which reduction of more ?refractory? oxides (e.g., chromia, magnesia, silica, alumina and even urania and thoria) might take place were not explored in the study. Note that BB1and BBB1 contain more than 7% combined silica and alumina (SiO2as a flux addition during smelting, and Al2O3from refractory contamination) and they do not fall on the general trend defined by the other samples. The U and Th concentrations of sample E2 is noteworthy. In the preparation of slag E2, monazite concentrate was added to the ilmenite to increase the concentrations of radioactive elements in the slag. This was done primarily to facilitate the detection of Th and U during the phase chemical characterization of the slag. Radioactivity measurements Gamma ray emissions from the samples were measured [ ]

Jan 1, 2007

By W. K. Brisden

The SAG Milling Seminar, which was held at Murdoch University in Perth on 30th November and 1st December, 1989, was a very successful technical seminar. Organizer Dr Norm Stockton reported a total attendance of 130, which was higher than the 70 expected: 20 delegates came from the eastern States and the remainder were from Western Australia.

Jan 1, 1990

Scrap printed circuit boards were selectively smelted at 1 200°C to produce a metallic alloy having three phases. These phases were identified as a lead-rich phase, a low tin content alpha bronze phase, and a high tin delta phase. Electrochemical leaching studies on this alloy were done in 1 mol/dm3 sulfuric acid or in 2 mol/dm3 hydrochloric acid (adjusted to an ionic strength of 3 mol/dm3). The lead rich phase was more strongly passivated in sulfate media, and in this medium the high tin content delta bronze was more resistant to corrosion than the lower tin alpha bronze phase. In chloride medium the lead phase and both bronze phases corroded readily, but with current densities about an order of magnitude lower than in sulfate medium (static conditions) for the bronze phases. The high tin delta bronze phase was found to form a passivating layer in sulfate media. A similar layer was not seen in chloride medium. The leaching studies in sulfate medium also showed the existence of an alpha bronze phase of lower tin content in the centres of the alpha phase grains. This phase was quite resistant to leaching in sulfate medium.

Jan 1, 2009

By H. M. Friede

Discussion of the above paper by A. SIFF The steely nature of the Iron Age objects mentioned in Dr Friede's paper point to two hypotheses. (1) The African iron workers were conversant with the art of direct steel manufacture. (2) They were less knowledgeable of the art of the production of carbonless iron. In this context I cannot but quote T. A. Wertime.

Jan 1, 1980

1. Book review . Australasian coal mining practice, edited by C.H. Martin. Reviewer: R.B. MacGilIivray This book is an extremely comprehensive coverage of coal-mining practice in Australasia, the countries covered being Australia, New Zealand,and Papua New Guinea. 2. From The Institute of Metals The folowing are available from The Institute of Metals, 1 Carlton House Terace, London SWl Y 5DB. Physical and elastic characterisation, edited by M. McLean. 1989. 228 pp. £25.00. High nitrogen steels, edited by J. Foct and A. Hendry. 1989. 461 pp. £49.50. Proceedings of the First International Calcium Treatment Symposium. 1988. 116 pp. £15. New cored-wire injection techniques, particularly as Design for recyc/ability, by Michael E. Henstock. 1988. 150 pp. £15. Solidification processing. 1988. 549 pp. £45. Marine engineering with copper-nickel. 1988. 103 pp. £18. Characterisation of High Temperature Materials. 3. New journal FMJ International Publications Lid have announced a new quarterly publication, Aluminium Today. 4. Other new publications Algorithms in real algebraic geometry, edited by Denis S. Arnon and Bruno Buchberger. London, Academic Press, 1988. 274 pp. £15.95. Proceedings, Foundry and Heat Treatment 88. R150 per set of 5 volumes, or R40 per volume.

Jan 1, 1989

[Consider a square block W in an ore body S2, to be valued from one centre sample w, and one corner sample w2 (Fig. 9.1). The sample set is ws = Iw,;w21. We can estimate the block average µw by the average of the sample values x, and x2: µw = 'z (x, + xz). (9.1) The error made is measured by the estimation variance: o' (ws to W) = 2 - (ws; W) - - (ws;ws) - - (W; W). (9.2) However, we know that the centre sample w, gives more information about the block value than the corner sample w2. In the example studied in § 8.4, where w, and w2 were considered to be points, we found that of (w, to W) was nearly one third smaller than o2E (w2 to W), therefore when estimating W one should give more weight to w, than to w2. In general, when evaluating a block W from a set of n samples ws, where WS = l w;w2; ... wn1, a better estimator of µw can be obtained if we give different weights to the sample values, depending on the size and the positions of the samples. Some desirable properties of such an estimator µw are: ? It should be a linear function of the sample values xi: n µw = bi xi (9.3) =t where bi = weight given to sample x . ? It should be unbiased, i.e. its expected value should be equal to the true block value: E [µw - µw] = 0. (9.4) ? The mean squared error of estimation of µw should be a minimum E [(µw - µw)2] = a minimum. (9.5) The estimator which satisfies these properties is a minimum variance, linear and unbiased estimator, and is known as the kriging estimator. The corresponding error of estimation is the kriging error. This estimator is also known as the BLUE (for Best Linear Unbiased Estimator) estimator. This was named by Matheron in acknowledgement of the early work of Krige's in the optimization of the evaluation of the South African gold mines. The following notations will be used: µK kriging estimator. o2k = o2K (w,, to W) kriging error.]

Jan 1, 1978

By J. T. M. Amphlett, C. A. Sharrad, M. D. Ogden, R. I. Foster

"A renewed interest in nuclear power around the world in order to reduce greenhouse gas emissions is going to increase demand for uranium as fuel. This will result in more uranium being mined, which will in turn increase associated environmental pressures, such as fresh water use. A move to lower quality waters containing impurities such as chloride would help alleviate these pressures. In this work, we determined the uptake characteristics of weakly basic anion exchange resin Ps-EDA towards uranium from saline solutions in a dynamic flow column. Breakthrough curves were produced, with suppression of uptake being observed for chloride concentrations above 5 g L-1. Calculated resin saturation capacities at zero and 5 g L-1 chloride are comparable with literature values for strong-base anion exchange resins, and exceed those published for weak-base resins up to 20 g L-1 chloride. Data has been fitted to multiple breakthrough models, with the modified dose-response model most effectively predicting uranium recovery. The results show that the ethylenediamine functionality could be suitable for use in future uranium processing flow sheets where a high-saline lixiviant is used. IntroductionIon exchange (IX) is a key technology in the uranium mining industry and is well established for the extraction of uranium from both acidic and alkaline leach liquors (Edwards and Oliver, 2000). It was first employed in 1952 at the West Rand mine in South Africa (Ford, 1993; Taylor, 2016). H2SO4 and Na2CO3 are the most commonly employed lixiviants used to solubilize uranium in acidic and alkaline leach conditions respectively. The chemistry of these systems causes uranium to form anionic sulphate or carbonate complexes, which can be taken advantage of by anion exchange resins.Another major technology for the extraction and purification of uranium from leach liquors is solvent extraction (SX). This technique involves the extraction of uranium from the aqueous phase into an immiscible organic layer. Although this is a commonly used method, there are major drawbacks to it, including the use of large volumes of flammable solvents, solvent loss, phase disengagement, third phase formation, and the production of problematic degradation products (Veliscek-Carolan, 2016). These problems can be circumvented through the use of IX resins."

Dec 1, 2018

1. Book reviews A report by the Monopolies and Mergers Commission on the efficiency and. costs in the development, production and supply of coal by the NCB (Chairman G. Le Quesne). London, Her Majesty's Stationery Office, Jun. 1983. £20 for report and appendices (2 vols). Reviewer: M. J. Martinson Canadian mines handbook 1983-84, edited by M. R. Brown. Toronto, Northern Miner Press Ltd, 1983. 444 pp. $22. Reviewer: Northern Miner Review Editor 2. New publications Developments in geophysical exploration methods-5, edited by A. A. Fitch. Barking. Applied Science Publishers Ltd (Ripple Road, Barking, Essex IG II OSA, England), 1983. 255 pp. £35.75. High-pressure researches in geoscience--behaviour and properties of earth materials at high pressures and temperatures, edited by W. Schreyer. Stuttgart, E. Schweizerbart'sche Verlagsbuchhandlung, 1983. 545 pp. DM 188. Dynamics of oil and gas accumulations, by Alain Perrodon. Pau, Elf Aquitaine (Documentation Centre Micoulau, 64018 Pau, France), 1983. 368 pp. 240 FF. New paths to mineral exploration, edited by F. Bender. Stuttgart, E. Schweizerbart'sche Verlagsbuchhandlung, 1983. 169 pp. DM 58. Results of the First Workshop on Standards in Geothermics, edited by R. Haenel and M. Gupta. Stuttgart, E. Schweizerbart'sche Verlagsbuchhandlung, 1983. DM 98. E&MJ book of jlowsheets edited by Paul C. Merritt. New York, McGraw-Hill, 1983. 214 pp. $42. 1983 E&MJ international directory of mining. New York, McGraw-Hill, 1983. 808 pp. $70. The future of heavy crude and tar sands - volume 11. New York, McGraw-Hill, 1983. 1300 pp. $1l0. 3. Mineral Policy and Energy publications Aluminium, by A. Johnston. 12 pp. . Arsenic, by J. J. Hogan. 4 pp. Cobalt, by D. G. Fong. 6 pp. Selenium and tellurium, by A. G. Johnston. 7 pp. Stone, by D. H. Stonehouse. 13 pp. Uranium, by R. T. Whillans. 16 pp. 4. Mintek publications Report M88 'l'he recovery of platinum-group metals and gold by the lead-collectionstep of thefire-assay procedure. Report MI04 The preparation and analysis of reference materials, and the provision of recommended values. Progress report no. 5. Report Mll1 The determination, by flow-injection analysis, of iron, sulphate, silver, and cadmium. Special publication 3 A guide to the presentation of papers.

Jan 1, 1983