Open pit mines need to be kept dry at all times. Pumping water out before it gets to the walls ensures conditions within the pit remain safe and stable.
After a very wet winter and unexpected large downpour, most sites have dewatering problems and for this mine, the problems were more severe. Apart from the water collecting in the pit, the mine walls became very saturated, heavy and unstable.
Added to the problems were underground rivers leading towards the pit.
In this project, eight submersible pumps were installed to dewater the area and keep pressure off the walls. A crew of two were used to ensure these pumps were installed and pumping within the required time.
The eight pumps were set to between 650ft (200m) and 800ft (250m) and were all installed and pumping within 24 hours !!
This feat would not be possible if rigid column had been used.
Fault line as seen from the pit
This picture shows the fault line in the middle of the photo. To the left one can see the signs of previous slippage.
Fault line from the surface
Here one can see a major fault that occurred over a couple of days. In the center of this picture is a dewatering well that was drilled only a few days before.
The team has arrived on site. A new well has been drilled and new electrical supply connected. The contractor arrives on site with the Boreline, pump and cable all attached and ready for immediate installation.
Boreline Spool-O-Matic ready for action
The Spool-O-Matic is used to install the pumps. The Boreline is rolled onto the unit and prepared at the well. The rolling wheel is positioned at the well.
Final documentation before the pump is lowered. A small footprint ensures a pump on Boreline can be installed in difficult and inaccessible areas. This also allows wells to be better positioned in ideal locations.
Ready and installated
The pump is ready to be lowered into the well using the Spool-O-Matic. In the second picture, the the base plate will move over the wheel and come to rest on the well casing.