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By Peter McBride

Human excellence in all areas of endeavour is acknowledged and recognized. Establishing role models and spreading the word on best practices helps broader audiences. For on-the-job safety, recognition awards are a component of successful programs. In Canada?s mining industry since 1941, the John T. Ryan Safety Trophies initiative has contributed to the sector?s improving record in this area. The much sought after and rich in history John T. Ryan trophies are recognized symbols of safety excellence in Canada. The effectiveness of the Ryan safety recognition program in Canada has led to its export to other mining countries seeking to improve their overall safety performance.

May 1, 2008

By Joseph C. Hirschi

Mine engineers have been interested in building models that simulate mining operations since computers were introduced to the industry in the 1960s. Computer models enable operational scenarios to be evaluated without the need for actual field experimentation. Virginia Tech’s FACESIM and CONSIM, Penn State’s UGMHS, and KETRON’s CPMINE are perhaps the best known early models. Recently, SIUC has modified a Microsoft® Excel version of Virginia Tech’s Mathematical Model, calling it the SSP Model. It is used to quantify the significance of various controllable parameters. Productivity increases approaching twenty percent may be achieved where recommendations suggested by the model are applied.

Jan 1, 2005

By E. C. Wilson

The knowledge concerning the lubrication of open gearing for mining machinery has contained many unknowns and at its best has relied to a great degree on a "Rule of Thumb" procedure. It will be within the scope of this paper to explain what we have learned to date and what must be learned in the future. Action of Two Gears in Mesh Let us review some of the basic fundamentals concerning the action of two gears during mesh. Most of the gears we use are involute and may be spur, helical, or herringbone. The gear contact is a combination of rolling and sliding action.

Jan 12, 1968

By Antonio Peralta, Guillermo Dante Ramírez-Rodríguez

Mining is generally considered a large-scale hightech industry. However, it has estimated that about 12 million people, about 30% of the world’s total mining workforce, relied on small-scale mining for their livelihoods. During the years, the large-scale mining industry has developed best practice environmental procedures, which have been applied in diverse settings through the world. In contrast, small-scale mining is better known for its high environmental impact and the lack of safe and healthy working conditions. This paper will discuss the environmental control strategies used by the large-scale mining industry, and its applicability to small-scale mining in developing countries.

Jan 1, 2005

By Robert Lewis

Some recent experiments in the use of compressed air for rock drills at higher than usual pressures, up to 150 lb. per sq. in., emphasize the importance of maintaining the compressed-air system in the best condition if the greatest possible over-all efficiency is to be secured. No claim of high over-all efficiency can be made for the compressed-air system of braking that is used on railroad trains, yet the air brake works effectively. Compressed air is not used efficiently in the rock drill, but no other type of machine drilling is yet a serious competitor of the air-driven rock drill.

Jan 1, 1930

By Robert A. Bauer

This study showed that diametral point-load testing performed parallel to the bedding planes of highly anisotropic sedimentary rocks produced inconsistent results that cannot be used to accurately estimate uniaxial compressive strength. Axial point-load values from tests performed normal to bedding planes and evaluated by the T500 index produce good correlations with the uniaxial compressive strength values obtained for five different rock types. A strong correlation also existed between the moisture content and the uniaxial compressive strength of the tested lithologies. A combination of axial point-load and moisture content indices produces the best correlation with the uniaxial compressive strength test results.

Jan 1, 1984

By H. R. Coles, S. P. Chong

Test work conducted in the 6.4 and 10.5 m (21 and 34 ft) Aerofall mills at the Iron Ore Co. of Canada Carol project showed that conventionally used "deflector" type liners, which form the basic principle of Aerofall Mill grinding, did not necessarily provide the best grinding performance. A new design, using low profile liners incorporating radial ribs of proper height, actually improved the mill throughput 9-20% without sacrificing grinding efficiency. In addition, the new design reduced liner weight and scrap losses, resulting in a 25% reduction in liner consumption. It provided better protection to the mill shell and reduced the overall maintenance cost for the mills.

Jan 1, 1984

There are two main areas of application of geology in quarrying: (i) In regional planning for industrial mineral requirements.(ii) In direct quarry management. The regional planning requirement has recently become more evident because of greatly increased land demand conflicts around cities. The direct quarry involvement is a reflection of both the economy and the greatly increased sophistication of the quarry industry. Here, professional planning and development expertise by a geologist is required, to ensure continued supply of raw materials at the best price to the consumer with sufficient profit to the producer. Today, geological insurance safeguards capital investment in plant and assures economical development plans.

Jan 1, 1978

By R. Larry Grayson

In an interdisciplinary research effort at West Virginia University, the Mine Management Support System (MMSS) is being developed as a window-based shell that may be used for the integration of a myriad of applications software. A number of integral components that focus on enhancing operational decision making are being developed as well. MMSS includes a flexible and robust work scheduling system that assigns the "best," qualified workers to the highest priority jobs on a shift while considering many practical and dynamic parameters affecting the assignments. A consultation system has been developed to help solve operating problems using management-preferred responses and the latest available information on operations.

Jan 1, 1992

By Nicholas J. Grant, Chih-Chung Wang

TO phase of the Ti-0 system has the structure of NaCl and has a wide range of solid solubility.' In the course of studying the Ti-Cr-0 ternary system, binary alloys were made of iodide titanium and high purity TiO,. It was found from X-ray studies of the binary alloys that a transformation of the TiO appears to take place at a temperature near 925°C. Evidence of this phase change is best seen in Fig. 1. Fig. 1A shows the X-ray spectrometer pattern (CUKa radiation) of an alloy of 25 wt pct 0 corresponding to the stoichiometric composition of TiO.

Jan 1, 1957

By Pradip

The selection, testing, and commercial utilization of flotation reagents is best carried out in stages through microflotation tests on pure minerals and their synthetic mixtures followed by bench-scale batch flotation tests on the ore. A systematic approach to quantitatively evaluate different reagents, in particular, through the analysis of batch flotation data, has been presented in this paper. It is recommended that the reagents are compared both in terms of their performance with respect to the recovery-time as well as the recovery-grade plots. While the former describes the kinetic aspects of reagent interaction, the latter is a measure of its selectivity for a particular separation problem.

Jan 1, 1987

By Robert H. Richards

While yet in correspondence with the heads of the several mining schools for the purpose of bringing the details of my Address into the best form for publication, a severe illness overtook me, and before I had recovered sufficiently to turn my attention to matters of this character the Address had been printed in its imperfect form for volume xv. of our Transactions, and the type had been distributed. The incorporation of the later corrections, in the form of a Supplement, became a necessity. To simplify the corrections as much as possible to the reader, every paragraph which has been revised in any way is here reprinted in full.

Jan 1, 1887

By Paul Gribbon, Greg Colzani, Jim McDonald

The $300 million West Side Combined Sewer Over?ow Project consists of over5.5 kilometers of soft ground tunnel, an 833-million liter per day (220-MGD) deep shaft pump station, 3 kilometers of micro tunneling, and other miscellaneous shafts and pipelines. The construction contract, underway since September 2002, is a reimbursable cost plus fixed fee contract that included a quali?cations-based contractor procurement process and has undergone some modi?cation since execution. This paper will describe the contractual issues addressed to date, dispute resolution, where improvements can be made, and how an Owner can evaluate whether this type of contract is the best approach for an underground project.

Jan 1, 2005

By F. E. Bachman

There is such a great variety of opinion concerning the best method of determining phosphorus in pig iron and steel, that a list of determinations, on a uniform sample of pig iron, together with a short description of the methods used by different chemists, and a few experiments on the accuracy of some of the methods used, [nay be of interest to members of the Institute. All the results given in List A are from the same lot of drillings, thoroughly mixed, except Nos. 8 and 9, and 28 to 32 inclusive, which are from the same pig, but were taken at a later period.

Jan 1, 1882

By Lawrence Mirabelli, William Hissem, Gary Veltrop

Capital Quarries Company, Inc., Jefferson City MO produces aggregate products for road base, asphalt, concrete and concrete block. With their production quantities small in comparison to those produced by the goliaths of the aggregate industry, they find it necessary to constantly stay on the leading edge of best practices for cost control, process and production improvement to sustain a successful business. In the words of Eric Strope, President, “The safety of our employees is foremost. They all work hard each day. They are focused on keeping our cost to manufacture down. As I see it, we cannot work any harder so we must work smarter!”

Jan 1, 2009

By Jason N. Scott

It is now possible using low-cost wireless technology and rugged hand-held devices to record data on site electronically and for that data to be instantly available to others. This could potentially eliminate many problems that traditionally lead to remedial work, such as poor communication and the late detection of non­conformances. However, determining how best to implement such a system and integrate it with the rest of the business process is far from simple. This paper looks at Stent's experience of these issues by way of a case study of the SHERPA system. This is a wireless site data collection system developed for use with rotary bored piling.

Jan 1, 2006

By Carleton Ellis

The problem of the influence of hot surfaces upon gaseous combustion is one which, from a purely scientific standpoint, has engaged, for many years past, the attention of Prof. William A. Bone, of Leeds University and the Imperial College, London ; and as his recent work has been the direct outcome of earlier scientific investigation, it will be appropriate, by may of introduction, to review briefly the present position of science with respect to this important subject, as stated by Professor Bone. One may perhaps best arrive at an understanding of the term " flameless " or " surface " combustion by considering certain facts which differentiate it from the more familiar processes of

Jan 1, 1913

By J. W. Snavely

WITH all the advantages of handling bulk materials by means of belt conveyor also go some problems, one of the most persistent being that of cleaning. When sticky materials are being carried; the build-up of material on the return idler rolls results in difficulty of belt training. Much attention has been given to the problem of cleaning conveyor belts, and a great variety of cleaning devices have been developed. Even the best involve troublesome maintenance, and none can completely remove the fine particles imbedded in the belt cover, which cause rapid wear of the return idler rolls, and at the same time, of the belt cover as well.

Jan 12, 1951

By Linkson PB

The presence of residual cyanide in mine tailings and fill sands may, under specific circumstances, lead to acute and/or chronic cyanide poisoning of the environment and individuals. In this paper, the nature of cyanide contained in mine tailings is discussed, along with the circumstances under which such cyanide would become a hazard. A number of methods for cyanide degradation are reviewed in the paper, with special emphasis being placed on biological degradation (due to its low costs and the non toxic nature of the degradation process itself). Recommendations are made as to the best methods of setting up a biological degradation system, for use in mining Situations.

Jan 1, 1987

By Earl C. Hutchison, Wade C. Hutchison

To effectively evaluate property damage that is claimed to have been caused by blasting activities and in order to lay the proper foundation to build the best legal defense, identification of the actual causation for the damages are necessary. For the past twenty years, engineering personnel from VCE, Inc. (previously Vibration Control Engineering, Inc.) have been evaluating claimed blasting damages with pre and post blast inspections, with analysis of seismic levels, blasting amounts at given distances, and with other engineering considerations. In addition to these evaluations, they have also documented other causes for damages which are of the types that are often claimed as blasting damage.

Jan 1, 1995