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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 L. D. Smith

Paper presented at the conference: Risk assessment in the extractive industries, held in Exeter, UK, 23-24 March 1994, and first published London: IMM, 1994, preprint volume. 22pp., 15 refs. The concept of risk is well established in the mining industry but it is difficult to provide a quantitative assessment of risk. A discussion is presented of the significant sources of risk in a mineral project and how they are addressed. The discount rate is examined as a fundamental means of reflecting risk in discounted cash flow evaluations. Current industry practice is discussed and a methodology for the analysis of risk levels is proposed which assesses the constituent components of the discount rate (real interest, mineral project risks and country risk)

Dec 1, 1994

By R. T. Grant, C. Bazin, D. Hodouin

It is shown that most of the variation in the results of semi-batch flotation tests is related to the unavoidably stochastic nature of the flotation process. The preparation and analysis of flotation samples and, to some extent, operator error in performing the flotation test procedure are responsible for a small proportion of the observed variability of the calculated flotation performance indices

Jun 17, 1905

Jan 1, 1984

By J. P. Rees

Describes methods of dust-sampling such as weighing the dust caught on cotton-wool, the sugar tube, konimeter, circular konimeter and the thermal precipitator. Covers the work of mine dust inspectors, the Miners' Phthisis Prevention Committee and the Chamber of Mines Dust Department.

Jan 1, 1947

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

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. From

The organisation's mission is to promote research and technological development in processes relevant to the minerals industry by providing expertise, developing and managing jointly funded projects, undertaking commissions and education and establishing and maintaining research and development networks. It was responsible for the administration of the Mining Technology 2000 national programme to reduce production costs per metallic unit by 50% over 5-8 years, which involved 120 projects in all. Technical areas included ore characterisation/delineation and mine planning, rock fragmentation, rock mechanics, maintenance, energy and ventilation, automation and information systems, cut and fill, bulk mining methods, drifting and production-face development. Other projects have been the Ore Geology Related to Prospecting (PIM) programme to raise the standard of ore geology research in Sweden and promote exploration for volcanogenic massive sulphides in three key regions, and a joint research project on ventilation control according to requirement, including development of fan and gas monitoring systems and an improved, adjustable and intelligent fan

Jun 17, 1905

Discussion at the The Midland Counties Institution of Engineers' general meeting, held in Nottingham on 6th May 1916, included contributions by Bramall E., Bragge G.S. and Watkins W.G. regarding possible measures for reducing energy consumption in coal-winding and pumping by centralising engines, using exhaust steam, improving coal quality and size uniformity, or mechanical stoking

Dec 1, 1916

By F. G. Bell, S. E. T. Bullock

The investigation was undertaken as part of the environmental management programme that must be implemented on mine closure. It involved sampling and analysis of water from boreholes, the tin mine workings, trenches and pits as well as soil and dumps. Both ground- and surface water in the immediate vicinity of the mine was found to have been affected to varying degrees, mainly due to acid drainage from the pyrite dumps. Metal ions and toxic salts are taken into solution with increased acidity and precipitated in the soil when the pH rises again; there are concentrations of metal ions in the soils around the main dumps, but these do not seem to pose a major threat in a regional context. The low groundwater gradients, together with the dyke system in the vicinity of the main dumps and the impermeable nature of the Boschoffsberg rocks, make it unlikely that affected groundwater will migrate further than 1 000 m to the north and north-east. Nonetheless, it has been decided to remove the pyrite dumps

Dec 1, 1995

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 M. J. Matos, W. Patruk

The correct version of Equation 1 is represented and Tables 3 and 6 are revised to consider all size fractions, including those coarser than 300 micrometres, in calculating the total liberation from King's fractional liberation

Jun 18, 1905

By H. L. Willett

The self heating of coal, or spontaneous combustion, has been a problem for centuries. This symposium addresses the issue.

May 23, 1905

By D. J. Spottiswood, R. K. Tuteja

Axial grade profiles were analysed for a pilot column operating in reverse flotation mode to float talc from a gold-bearing sulphide ore. It was found that concentration gradients in the pulp are very low. Most of the cleaning action, both upgrading of valuable minerals and rejection of gangue, occurs in the froth zone

Jun 17, 1905

It was intended to show a film on Dust Suppression in the South Wales Coal-mines. Unfortunately, owing to a breakdown, only a small portion of the film was shown.

Jan 1, 1947