Detour Lake Gold Mine - Canada
SENES undertook an overall assessment of the acid generation potential of tailings, waste rock, the open pit and low grade ore dumps at the Detour Lake mine in northeastern Ontario. The assessment included an evaluation of potential concerns and development of recommendations to mitigate future concerns. The report also reviewed potential closure options and costs. (Placer Dome Inc.)

Doyon Gold Mine - Canada
SENES has undertaken several assessments for LAC Minerals at La Mine Doyon. These studies include: modelling of the acid generation potential of sulphidic waste rock and tailings; a research investigation into cyanide degradation in the tailings pond; investigation of alternative water supply and water management; a research investigation into cover material alternatives for capping acid generating waste rock; a technical review of the mine water treatment system operation, including recommendations for upgrading the system and for sludge management; identification of long-term closure concerns; and, providing advice on appropriate management and mitigative measures to address decommissioning of the site. (LAC Minerals Ltd.)

ERG North Basin, Ontario
This project involved the development of closure options and recommendation of a plan of action for the remediation of the ERG North tailings basin. The study involved site reconnaissance; a downstream biological survey; sampling and analysis of tailings solids, pore water and pond water; ABA testing; and geotechnical input regarding dam stability. (Ministry of Northern Development and Mines)

Equity Silver Mine - Canada
SENES provided technical support to Equity Silver in the development of their reclamation proposal for high sulphide bearing waste rock piles. The Equity plan for closure of acid waste piles involved covering the piles with clay and treatment of residual runoff for as long a period as required. SENES developed a predictive, screening level model to assess acid generation rates with and without cover as well as for various types of cover material. The suitability of local materials was tested in the laboratory. The model results were used to support Equity's position that the current bonding cost provisions were adequate. (Equity Silver Mines Limited)

Les Mines Est Malartic Ltée and Les Terrains Aurifères Malartic Ltée, Quebec
SENES was retained by Lac Minerals to undertake an assessment of long term acid generation problems at two operating mines, Les Mines Est Malartic and Les Terrains Aurifères in northern Quebec. This work included modelling, cost analysis and assessment of the environmental benefits of various decommissioning options. In addition, SENES undertook an evaluation of water quality data collected at the sites and provided technical guidance on waste water treatment system operation. (LAC Minerals Ltd.)

Matachewan Gold Mine - Canada
SENES was retained as MCML's private consultant to provide site assessment and technical advice relating to environmental impacts, tailings management, remedial investigations and cleanup requirements for the failure of a 150,000 m3 tailings area and subsequent effluent discharge into Davidson Creek and the Montreal River near Matachewan, Ontario. SENES' responsibilities included developing the necessary programs to address the requirements of Orders issued by the MOE and MNR and participating in Environmental Appeal Board Hearings relating to appeal of the Orders. The assignment involved reviewing all of the investigation, evaluation, design and construction activities undertaken by the Regulatory authorities both during and after the failure. (Matachewan Consolidated Mines Limited)

Owl Creek Gold Mine Waste Rock Dump
SENES was part of a team which evaluated closure options for the Owl Creek gold mine in northern Ontario. The major concern was acid generation from the waste rock dump. SENES undertook an assessment of the acid generation and long-term nature of the acid problem and evaluated the environmental effects of several closure options. The data was integral in the mine's selection of pit disposal for resolution of a major environmental liability. (Falconbridge Gold Corporation)