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RGC: Project Experience
Cinola Project
British Columbia, Canada
- Client:
- City Resources (Canada) Ltd.
- Years of Service:
- 1986 to 1988
- Project Description:
- The project was a proposed 6,000 mtpd open pit gold mine located on
Graham Island, the northernmost island in the Queen Charlotte Islands
group, off the West Coast of Canada. Dr. Robertson was the Project
Principal and a lead technical contributor when SRK designed the
waste management and water management facilities for the project.
The Queen Charlotte Islands are an environmentally sensitive area. All
planning and designs for the project have recognized that the mine must be
operated and closed down in an environmentally safe manner. The work
involved "state of the art" research and study of acid mine drainage and set
new standards for the engineering design of an environmentally safe mine.
- Services Provided:
- Site selection and ranking of potential tailings impoundment sites
- Site investigations and preliminary design reports of tailings impoundment
system for environmental impact analysis
- Seismic risk assessment
- Rock waste and tailings geochemical characterization and modelling
- Design Features:
- Tailings Impoundments
- Three-pond impoundment system to provide zero-discharge of mill discharge
water in an area with annual precipitation of 2 meters
- Earth and rockfill embankments, ranging in height from 20 to 70 m designed
to withstand shaking from a maximum credible earthquake of magnitude 8.6
(Richter scale)
- Groundwater investigation and modeling to estimate groundwater seepage
and movements both during operation and after closure of mining
- Mine Waste Management System
- Most rapidly oxidizing rock waste deposited below water in
tailings impoundment
- Remaining acid generating waste in life of mine temporarily
"stockpiled" on undrain seepage collection system
and with clay covers
- Finely crushed limestone blended into waste to control acid
generation during mining period
- On mine closure, all acid generating rock returned to pit
and placed below final flooding level
Papers:
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