Ekati Diamond Mine

Project Name:

EKATI DIAMOND MINE

Client:

BHP Billiton Canada Inc.

Location:

Northwest Territories, Canada

Related Services:

Aquatic Services
Fisheries Services
Terrestrial Services
Atmospheric Services
Environmental Management
Ecological Risk Assessment
EIAs
Reclamation / Site Closure
Physical / Numerical Modelling
Permitting
Baseline Studies
Community Engagement
Traditional Knowledge and Use
Monitoring and Evaluation
GIS

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Profile

The EKATI Diamond Mine is Canada’s first diamond mine.  It is in the Barren Lands of the Northwest Territories, about 300 kilometres north of Yellowknife.  The project area contains over 121 kimberlite pipes — all located underneath small lakes — of which at least six contain high-quality diamonds.  Once a lake is fished out and drained, the kimberlite is excavated from an open pit with shovel and truck, and transported to an 18,000-tonne per day process plant where it is crushed.  Diamonds are separated with X-ray fluorescence sorters and processed kimberlite is stored in a large impoundment called the Long Lake Containment Facility or LLCF.

Overview

EKATI is in a pristine tundra environment.  The harsh climate and low biological productivity of the area means that special effort is required to mitigate the environmental impact of mine activities.  As the first diamond mine in Canada, and one of the most visible new businesses in Canada’s North, the mine operates according to strict criteria established by territorial and federal environmental review agencies.

Experience

Rescan scientists (hydrologists, meteorologists, geologists, geochemists, limnologists, botanists and biologists) began comprehensive environmental baseline studies of the EKATI project area in 1993 and have continued to conduct environmental studies every year since then.  Rescan completed the Environmental Impact Assessment (EIA) in 1996 and the mine began operation in 1998.

Rescan scientists currently conduct a wide range of annual studies to monitor environmental quality including: monitoring water quality and aquatic biology downstream of the mine in the Aquatic Effects Monitoring Program (AEMP), monitoring mine effects on wildlife through the Wildlife Effects Monitoring Program (WEMP), and monitoring fish habitat success in the Panda Diversion Channel.  In addition, Rescan conducts special studies at the request of BHP Billiton that assist in environmental permitting, management planning and mitigation planning.  These include, among many others, ecological risk assessments of various compounds and metals to local aquatic life, modelling water quality in the LLCF and in the downstream receiving environment, experimenting to test the effectiveness of calcium chloride as a settling aid in the EKATI process plant, surveying the chemical composition of pore water in the LLCF, and assessing the potential impact of mine closure on lake surface elevations.  In 2006, Rescan wrote the three-year review of EKATI environmental impacts that compared monitoring results with the predictions of the 1996 EIA.  Rescan wrote the EIA for EKATI’s successful expansion into the Pigeon, Sable and Beartooth Watersheds in 2000, and Rescan provided scientific and technical support for EKATI’s water license renewal applications from 2003 to the present.