The Blast Movement Monitoring System (BMM System) is a unique solution that accurately measures 3-dimensional (3D) blast movement in hard rock mining.
A wide range of open pit (surface) operations recover more ore by accounting for blast movement:
The BMM System consists of directional transmitters placed within the blast volume prior to blasting. These are located after the blast with a specially-designed detector.
Purpose-designed software calculates the 3D movement vector of each Blast Movement Monitor (BMM), redefines ore boundaries or digging levels to account for the measured movement, and calculates the value of recovered ore, dilution and misclassification.
A Blast Movement Monitor (BMM) is installed in a blast pattern and moves with the rock during a blast.
3D blast movement is calculated from a BMMs pre- and post-blast position, measured by a Detector.
Four colours of BMMs represent unique characteristics to allow multiple BMMs in a single hole. This enables monitoring of mid-bench or flitch-boundary movement.
The Detector senses and records the location of BMMs in the blast pattern (pre-blast) and muckpile (post-blast).
The detected BMM location data is transferred to the BMM Explorer software.
BMT offers two types of detector: standard and survey enabled.
The standard detector measures BMM pre- and post-blast depth, and BMM precise location is surveyed by the mine site survey team.
The Survey Enabled Detector (SED) makes detection a one-step process through simultaneous recording of BMM depth and high precision GPS coordinates.
Survey Enabled Detector
BMM Explorer calculates new dig lines for the shovels and calculates areas of ore loss, dilution and misclassification that would have occurred if blast movement was not accounted for.
It is the world’s most advanced software for defining ore polygons after blasting, and is integral to the BMM System.
BMM Explorer enables you to:
Controlling ore loss and dilution is critical for most mining operations. Getting it wrong can result in tens of millions of dollars per year of lost revenue.
BMT’s Value Calculator quantifies the additional revenue realised by blast movement monitoring—that is if ore polygons were mined in their pre-blast (insitu) location rather than their post-blast location.
In this example, the Value Calculator reports that accounting for blast movement generated more than US$600,000 in additional revenue for this customer—in one blast.
The customer recovered an additional 28,000 tonnes (31,000 Tons) of ore, and reduced dilution by diverting 27,000 tonnes (29,700 Tons) of waste from the mill.
The following inputs were used to calculate these figures.
Gold price: US$1,250 per oz
Gold recovery 90.8 %
Rock density 2.9 tonne/m³
Processing cost US$10 per tonne