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By Cheryl L. Allen

The increasing energy costs associated with mining has become an issue that needs to be addressed for future sustainable production. Vale Inco is undertaking a Ventilation on Demand (VOD) Project in an effort to minimize costs, continue to mine at depth and reduce green house gas emissions. A dynamic VOD system is very complex with potential high risk. Therefore, a systematic approach is being taken for successful development and implementation of the concept. The physical components of the system are currently being tested at various Vale Inco mine sites. While the operability of the physical components are being tested, the strategy for optimizing the architectures of the system is being defined. This presentation discusses the method of developing a VOD system at Vale Inco.

Feb 1, 2008

By H. Wilhelm, W. I. van Drunick

The Anglogold Ashanti (AGA) Navachab single stage SAG mill has provided an excellent setting for incremental optimization. Over the past decades, several interventions have resulted in marked improvements in specific performance; including steel ball scat removal, re-design of the mill lifters, replacement the pebble crusher and cyclone cluster, as well as the use of a vibrating screen in place of a discharge trommel. Recent initiatives now include an operating fine DMS circuit, studies on pre-crushing of the ROM feed and also fine-screening as an alternative to hydrocyclone classification. The current optimized state of the Navachab mill allows it to operate at approximately 20% higher efficiency when compared to mills of similar shell dimensions in gold mining, treating similar ore. This paper describes the systematic improvement of the SAG circuit to its current state.

Jan 1, 2012

By F. M. Makarinsky

"This paper describes the conversion of conventional froth flotation cells to open-trough type bank cells, with 'buried' vertical metal partitions. These changes have resulted in: total froth removal along the full length of each bank of cells; extended flotation cell retention times; and has extended the life of the metal components, particularly towards the upper flotation cell areas.INTRODUCTIONOver the past twenty years, the flotation cells used at Falconbridge Limited, Sudbury operations concentrators, have gone through major physical changes. The various concentrators generally started with 100 cubic foot Denver Sub 'A' flotation cells. From these units, we progressed to 'converted' DR units, and/or Denver DR units, if purchased new. (Figures 1, 2, 3)In 1980, the Strathcona concentrator started to pay more attention to the 'front end' rougher flotation cells. Initially, the converted DR flotation cells had 'cut-outs' removed (Figure 4) at all upper vertical cell partitions, towards the ff9th lip areas, in order to get additional froth removal."

Jan 1, 1985

By Bryan Tisch

Goal of GMGE ??To advance mine reclamation through the beneficial use of organic residuals for the sustainable establishment of bioenergy crops and other productive land uses Objectives ??To advance the current ?standard? of mine reclamation by demonstrating that mining lands can safely become agriculturally ?productive? through the use of organic residuals. ??To generate and compile sound scientific data that can be utilized by stakeholders to better assess the environmental impacts of utilizing these materials. ??To complete a manual of best practices regarding the utilization of organic residuals on mine lands. *Considerable effort to be placed on operations/implementation side of utilizing residuals ?rather than just pure research

May 1, 2011

Some Statistics ? Feasibilitystudiescostbetween2% & 3% of capital andrequire8% to15% of total engineering effort ? Feasibilitystudiesusuallytakebetween8 and16 months ? Historically more than80% of projects fail to achieve all their objectives, usually blame the feasibility study ? What is bankable? Means that your promises will long be remembered. ? Poorly executed feasibility studies ? Driven by inexperience, unrealistic expectations, time constraints, financial constraints, lack of objectivity, front end loading activities incomplete or poorly done ? lack of minimum standard to provide a consistent approach Trend to improve???

May 1, 2010

By Fathi Habashi

New technology first introduced by Nippon Steel Corporation at Kitakyushu in Japan in 1976 now used at a number of plants in other countries, known as dry quenching of coke, uses nitrogen in a closed circuit to avoid environmental emissions. In addition, heat is recovered in the form of steam, from the red-hot coke. In steel plants oxygen is used extensively and therefore by-product nitrogen from air liquefaction can be effectively utilized in this way.

Jan 1, 2014

By M. Maeda, H. Sasaki

Dissolution characteristics of metals vary significantly when they form alloys with other elements. Because hydrometallurgical processes are essential in separation and refining of non-ferrous metals, it is important to study behaviors of alloys in aqueous solutions. The authors have studied dissolution characteristics of precious metals in acid solutions using electrochemical measurement. When precious metals are alloyed with Zn, its dissolution is promoted by an increase in surface area caused by the preferential dissolution of this metal. The electrochemical study also revealed that precious metals dissolved from some alloys at unusually negative potentials; the underpotential dissolutions are explained by activations of these metals in the dealloying.

Jan 1, 2014

? Élaboration de la Directive 019 (1982) ? Objectifs: ? Protection de l ?environnement ? Procédure administrative pour analyse et évaluation environnementale ? Officialisée en 1989 ? pas eu de modifications depuis ce temps Contenu de la Directive 019 ? Requête d ?autorisation ? Gestion des eaux ? Traitement des effluents ? Gestion des déchets et des résidus miniers ? Suivi environnemental Directive 019 Exigences environnementales ? Effluents miniers ? As, Cu, Ni, Pb, Zn, Fe, CN, MES, pH, toxicité aiguë ? Suivi environnemental annuel ? Effluent ? Réseau hydrographique ? Restauration

May 1, 2001

By Jehan Rondot

Des quartzites très pars ont été dêcouverts au cours de la cartographie de la region du lac des Martres, étape de l'étude géologique de la region de Charlevoix. On distingue quatre groupes métasédimentaires, tons con tenant des niveaux de quartzite dans an moins deux domaines géologiques différents, c'est à l'ouest, clans le domaine gneisso-charnockitique que se situent les quartzites du groupe des Martres. Quartzite et gneiss à grenat et sillimanite, en banes épais, constituent la formation de La Galette. A Pest, dans un environnement gneisso-granitique, les deux groupes métasédimentaires de Saint-Siméon, et de La Malbaie comprennent, par contraste, des bancs pen épais et de compositions variées. Les niveaux de quartzite dépassent rarement 50 m d'épaisseur. L'autre groupe metasédimentaire, celui de Saint-Tite des Caps, recoupé de nombreuses intrusions charnockitiques et granitiques, ne possède que de minces niveaux de quartzite. La pureté et la grande épaisseur des quartzites de La Galette suppose une histoire complexe qui se termine par des depots continentaux de climat aride, par opposition aux depots marins des autres groupes. D'autre part, la presence de ces quartzites an sein de roches Presque anhy¬dres et de haute temperature que sont les charnockites leur confère des caractéristiques de fusion sans decrepitation. Parmi la multitude de depots de quartzite qui existe clans le monde, peu sont de qualité supérieure. Or, de par sa composition chimique, le quartzite de La Galette se compare avantageusement à ceux des meilleurs gisements des Etats-Unis, de l'Europe de l'Ouest et de l'Afrique du Sud. D'accès facile pour l'exploitation, les gisements ne sont qu'à une trentaine de milles de Baie Saint-Paul ou de La Malbaie, sur le Saint-Laurent. L'utilisation en metallurgic prévue pour le quartzite de La Galette comprend la production de silicium, de ferro¬silicium et d'autres alliages de silicium. La composition du quartzite est en outre appropriée pour la production de carbure de silicium et de silicate de sodium. Les fines peu¬vent être utilisées pour la fabrication du verre et comme matière de charge.

Jan 1, 1977

By Margarete Kalin

Mine Waste Management ?Reduction of Sulphideoxidation or inhibiting weathering of rocks Geologist - broken or ground rocks Hydrologist - sources of contaminants Mining engineer - waste sites Consulting companies - income units People - Ugly, bad, dead Ecological Engineer Landscapes which contain building blocks of an emerging ecosyste

May 1, 2013

By Robin E. Goad

?Located 160 Km northwest of Yellowknife, NWT, Canada Current winter road access ?New all-weather road planned ?Power within 22 km ?Hwy to Edmonton 80 km south Close to existing infrastructure

May 1, 2006

By P .. D. Vaillancourt, D. F. Sangster

Several occurrences of disseminated galena, including a former producing mine, are found in Pennsylvanian fluviatile sandstone of the Salmon River Basin, Cape Breton Island, Nova Scotia. Detailed study of the distribution of these occurrences has revealed that highest galena concentrations are found in sandstone overlying channel-shaped depressions in felsic basement rocks. These buried depressions, in turn, correlate in position with modern streams in areas of basement exposure. This correspondence suggests that the latter are at least partially controlled by an exhumed Pennsylvanian topography. If this is correct, then several other streams in the area, lying on basement, may be used to locate possible undiscovered lead deposits in sandstones of the Salmon River Basin.

Jan 1, 1990

Who is ArcelorMittal Mines Canada ?One of Canada's leading suppliers of iron ore to steel markets around the world ?Past company name = ??Quebec Cartier Mining?? ?Operator of one of North America's largest open-pit mines ?Mont Wright Mines ?Fire Lake Mine ?Largest ArcelorMittal iron ore mining subsidiary ?Annual production of 15 million tonnes of concentrate ?Major expansion program to 24 MT/Y ?Internationally competitive pellet plant ?9.0 million tonnes annually

May 1, 2011

By Kevin Ross

Feasibility Study Team Processing / Engineering?Hatch, Vancouver Mining / Reserves?Australian Mine Consultants, Brisbane Geology / Resources?Roscoe Postle Associates, Vancouver Environmental / Permitting?Rescan, Vancouver Tailings BGC, Kamloops Probable Mine Components Mining tending towards caving methods Underground mine accessed by shaft /conveyor & decline Processing plant producing copper concentrate containing gold Concentrate trucked to rail head for export Non saturated tailings disposal

May 1, 2006

By Doug Ashbury

Diamond Miners? Challenges ? Remote ? 300 kilometres from Yellowknife ? Sub-Arctic conditions ? permafrost, climate ? No power ? No all-weather roads ? Ore bodies difficult to find ? Caribou, fish of special concern ? Communities with low education, little experience, but high expectations ? Major investment required ? Diavik C$1.3 billion

Apr 1, 2005

By Éric Côté

Introduction The 425 Main Ore Zone ? Block of ore partially mined in the late sixties; ? Area was sealed off for over 30 years due to SO2 emissions from oxidizing fill material; 425 Project goal ? Bring the zone back into production without jeopardizing the mine; ? Minimize risks associated to SO2;

Feb 1, 2008

By Roger Moss

OUTLINE Area selection Mineralization/Alteration Styles Island Copper Mineralization Geophysics Geochemistry Coppercorp Setting Mineralization Geophysics Geochemistry Formation Common Characteristics Conclusions

Apr 1, 2005

By Pierre Laliberté

Objectifs ?Quantifier les économies d?énergie potentielles liées àl?utilisation de différentes technologies ?Créer un modèle permettant d?évaluer les économies possibles d?énergie en combinant plusieurs technologies ?On ne peut simplement additionner les pourcentages d?économie individuels pour en évaluer le total.

Feb 1, 2008

By Richard Lavallée

La Mine Louvicourt est une mine hautement mécanisée exploitant un gisement polymétallique avec des chantiers transversaux minés et remblayés selon une séquence primaire-secondaire. Dans certaines parties du gisement, il n'y avait qu'un accès à la coupe inférieure, car il n'était pas rentable d'avoir aussi un accès par coupe supérieure. Le minerai situé au-dessus des chantiers avec trous ascendants était considéré comme ressource non rentable par minage mécanisé. L'option de miner ces ressources avec des sous-niveaux avec accès par monterie alimak et forage long-trous de petit diamètre fût donc étudiée et démontra une rentabilité intéressante, particulièrement en considérant les tonnes ainsi minées comme tonnage supplémentaire au tonnage planifié. Dans ces chantiers, les détonateurs électroniques ont été très utiles et de plus, les coûts d'explosifs ont étés réduits considérablement par l'utilisation d'émulsion pompée en vrac.

Oct 1, 2004

By Jean Robitaille

La découverte du gisement du puits Penna a nécessité une révision complète de tous les circuits du concentrateur Laronde pour permettre, premièrement, l?adaptation du procédé à la nouvelle minéralogie et deuxièmement, l'accroissement du tonnage de 1800* à 4500 t/j. Aux circuits existants de broyage, de flottation du cuivre, de cyanuration et du charbon en pulpe, les circuits suivants furent greffés : broyage semi-autogène, flottation du zinc, manutention des concentrés (épaississage, filtration, entreposage et chargement automatisé), décantation à contrecourant et précipitation au zinc, destruction des cyanures et remblai en pâte. Cet article se veut une revue des différentes étapes du projet d'agrandissement du concentrateur qui se sont effectuées par phases progressives de 1997 à 2000. De plus, une description des nouvelles technologies sélectionnées et implantées est présentée.

May 1, 2001