Faro Mine: Monthly Archives - May 2008

Dealing with Dust

May 20, 2008

On blustery days, when winds get above 20kph, fine dust particles on the surface of the Rose Creek tailings impoundment start to move. They are either carried into the air (in what is known as a suspension), or bounce along the surface (by a process known as saltation). Although it is much easier for us to see tailings suspended in the air (the typical dust cloud), over 90% of movement is usually across the surface.

Because of the action of the wind, tailings dust has been detected outside of the direct footprint of the Faro Mine complex. In response to these findings, the Faro Project Management Team commissioned a study to see what effect the tailings dust has had on the surrounding environment. Work was completed last year, and found that tailings dust does not currently pose a risk to humans or animals.

Over the long term, control of tailings dust will be an issue dealt with in any future closure plan. In the meantime, the technical team has been working with current site staff to design an interim measure to control dust. This involves spraying a chemical over key areas of the tailings, effectively 'sealing' the surface and creating a hard crust. The material is first mixed with water and applied by a vehicle-mounted sprayer, with periodic re-applications as needed. This approach was recently used at the GIANT mine in Yellowknife and proved to be very successful.

Our plan is to begin this interim dust control process this summer, and continue as needed until a closure plan is implemented. So, it could be dust free days in Rose Creek valley from now on!

UPDATE: Interim dust control measures were not undertaken this summer because of weather. Significant rainfall in Faro meant little to no dust coming off the tailings. This measure will begin next summer as required.