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By P. J. O'Connor, V. Gallagher

examined analytically in relation to the ratio of the

Dec 1, 1994

By M. Schwartz

Hosting copper, gold, oil and liquefied natural gas, the country is an interesting target for miners. However, remote locations in inhospitable, unusual and difficult terrain cause problems. The government has worked to create a Sovereign Wealth Fund to manage government surpluses from minerals and energy but PNG scores very low among many criteria, including land dispute resolution, as revealed by the 2014 Canadian Fraser Institute in its survey of senior mining personnel.

May 1, 2015

By R. P. Foster, ed.

The short selection of papers in the special issue provides an insight into the level of exploration activity in Africa and the science and technology that are underpinning it. A country-by-country survey is followed by discussion of geochemical exploration in tropical soils, the Liptako region of Niger, structural styles of deposits in Zimbabwe's Bulawayo-Bubi greenstone belt, structural controls in Zimbabwe's Eldorado shear zone, the regional framework for deposits in the Odzi-Mutare-Manica greenstone belt of Zimbabwe and Mozambique, and the Iperindo deposit in Nigeria's Ilesha schist belt

Apr 1, 1996

By P. Rama Krishna, B. Narasimha Rao, P. Ali i Peera

Induced polarisation (IP) surveys are commonly used in uranium exploration programmes in India. The IP method is effective in detecting the disseminated metallic sulphides that are often associated with uranium minerals. However, conductive and polarisable host rock or overburden often introduces inductive or electromagnetic (EM) coupling into time domain IP measurements. This makes it difficult to distinguish between responses due to such coupling and those that might indicate economic mineralisation. Attempts must be made to remove the EM effects before the IP technique is used in drilling programmes. Transient decay curves which were recorded during field surveys at Pisnari were factorised using the Marquardt algorithm. Dispersion plots of the amplitudes and relaxation times of the composite exponential function enable a clear distinction to be made between the effects of EM coupling and those of mineralisation.

Jan 4, 1993

By A. M. Marabini, S. Battaglia, M. Ciriachi

A computer program has been developed that produces graphic representations of the atomic structure of any crystallographic plane of a mineral. The information provided by the program relates to a purely geometrical model of the crystal structure in which each atom is represented solely by the x, y and z coordinates of its centre. Despite its simplicity, the program can be used as a first approximation model in studies of the interaction between mineral processing reagents and the surfaces of mineral grains which are assumed to be coincident with cleavage planes.

Jan 4, 1992

By NA NA

Profile of FOSROC, manufacturers and suppliers of products for the mining industry.

Jan 11, 1996

By Blatchford A. S.

Discussion at the North of England Institute of Mining and Mechanical Engineers' general meeting held in Newcastle-upon-Tyne, 3rd June 1916, on the paper published in Trans. I.Min.E., vol.LI, 1916, p.361-377, comprised written comments by Ashworth J. on the practicality of applying quenching materials to a dust cloud ahead of the explosion flame

Dec 1, 1916

Jan 1, 1947

Further discussion at the Mniing Institute of Scotland's annual general meeting held in Glasgow, 8th April 1916, of the paper published in Trans. I.Min.E. vol li, 1916, p.169-186 with discussion p.187-188, included oral and written contributions by McLaren R. and Waddell H.

Dec 1, 1916

Discussion continuing that published in Trans.I.MIn.E ., 1915, vol.L, p.449 and 1916, vol.LI, p.166, included contributions by Smith W., McLaren R., Gibson J., McCreath W., Sneddon J.B., Kirkpatrick J. and Mowat D.M. and a written response by Black J.N.

Dec 1, 1916

Discussion at the North of England Institute of Mining and Mechanical Engineers' general meeting held in Newcastle-upon-Tyne, 8th April 1916, on the paper published in Trans. I.Min.E., vol.LI, 1916, p.61-71, consisted of a written comment by Wood P.L. that a larger battery would be the only way to secure reliability

Dec 1, 1916

By Asfa-Wossen L.

Davy saw science to be the ultimate truth. He loved the utility and permanence of it and the feeling of progression. He was a bold chemist and an inventor, but he thought like a writer

Feb 1, 2015

Discussion of the paper published Trans Inst. Min. E., 1916, vol. li., page 99 comprises a written comment by Bolton H. giving two examples of the faunal evidence for deep-water vs littoral conditions of Goniatites (cephalopods) and Upper Old Red Sandstone fishes

Dec 1, 1916

By M. P. O'Reilly

A personal overview and assessment is given of the 42 papers delivered over the three days of the symposium. As well as 18 from the UK there were presentations from 16 other countries; 20 were on rock tunnels, 13 on soft ground and 3 on both; there were 17 case histories and 16 discussions of tunnelling machines but, for the first time in the conference series, almost no papers on tunnelling for mining purposes. Some projects, such as the Lesotho Highlands Water Project and the London Ring Main, attracted a number of papers addressing their different aspects

Jun 16, 1905

By T. D. Jones

Describes the facilities in South Wales for routine control and research work on all the various aspects of the dust problem. Considers mining and medical research, inspection and control, education, and plans for the future.

Jan 1, 1947

By G. E. Pearse, comp.

Questions from the conference delegates and replies by the papers' authors are summarised for sessions on hydropower, metro/rail and water/waste tunnels, tunnel-boring machines, environmental issues, research and case histories, design, and tunnel machinery, with reference to papers on tunnels in Lesotho, Nova Scotia, Italy, UK, Sweden, Kenya, Massachusetts, Germany, Norway, Taiwan, Switzerland, Greece, Malaysia, Australia and Texas.

Dec 1, 1994

By D. R. Wardrop, P. J. Rowsell, M. D. Waller

D.R. Wardrop agrees that artificial intelligence can contribute significantly to a reduction in both unit and overall well drilling costs but argues for human input to be allowed to overcome the differences encountered on striking the reservoir

Aug 1, 1995

By J. R. Budden, P. A. Spencer, J. Barrett

The initially produced arsenic (III) is very toxic to the unconditioned culture but the mixed culture has the capacity to oxidise it to arsenic (V) in the presence of iron (III). It was possible to build up the resistance of the culture through progressive sub-culturing on arseno-pyrite until it could tolerate steady-state concentrations of 30 mM arsenic (III) and 200 mM arsenic (V). With some samples tested in the continuous systems the final arsenic concentrations reached 330 mM. It proved possible to use the laboratory batch data to establish the optimum operating conditions for continuous test systems with capacities of up to 32 m3. Data on the residence time, oxygen uptake rates and gold extraction from the bio-oxidised residues could then be confirmed by continuous testing without the need first to use empirical means to determine optimum conditions for continuous bio-oxidation. The data on residence time, oxygen uptake rate, solids density and neutralisation could be used to estimate the capital and operating costs of treating any given tonnage of the concentrate of interest. It was established that the arsenopyrite concentrates can be suitably bio-oxidised to cause the liberation of at least 90% of the gold content. The method is simple to operate and is flexible over a wide range of external conditions

Apr 1, 1991

By P. A. Rossouw, G. A. Fourie

The correction to the paper published in Trans. IMM A, vol.105, 1996, p.A162-A165 stresses that figs. 4 and 5 had been interchanged, reproduces them with their correct captions for clarity and encourages readers to comment on the Delft proposal

Jun 19, 1905

Paper presented at the conference Risk assessment in the extractive industries, held in Exeter, 23-24 March 1994. Sensitivity analyses based on financial variables are now routinely applied to the forecast financial results of mining projects especially during the feasibility stage. Risk analysis is gaining acceptance but is still almost universally confined to the effects of variations in financial variables. The single most sensitive factor in almost all mining projects is the ore reserve, but it is either ignored or improperly used in sensitivity and risk analyses. Unlike financial variables, the components of the ore reserve (grades and tonnages of mining blocks) are a function of location within the orebody. Physical (mining) access to these components is therefore a function of time which has a crucial effect on forecast cash flows. It is critical that these fundamental concepts are included in risk analyses of mining projects. The effects are considered of the uncertainty of the ore reserve on feasibility studies and open-pit mine design for a small gold mining venture. Geostatistical simulation is used as a method of quantifying the risk in using grades and tonnages estimated from sparse data

Jun 16, 1905