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BMM System Hardware and
Software

Blast Movement Monitors

A Blast Movement Monitor (BMM) is installed in a blast pattern and moves with the rock during a blast.

BMMs are available in four colours, which means multiple balls can be placed in a single hole to monitor mid-bench or flitch-boundary movement.

To account for different blasting conditions, BMMs can be set to activate in either Standard or Blast Anytime mode.

Blast Anytime BMMs

  • Activate upon sensing a blast
  • Remain in a dormant state until activated
  • Move with the blast material
  • Transmit post-blast position
  • Optional activation delay in 1-hour increments
  • Installation can occur days or weeks ahead of blast

Standard BMMs

  • Activate at installation time
  • Transmit once activated
  • Move with the blast material
  • Transmit post-blast position
  • Optional activation delay in 4-hour increments

 

Detector

The Detector senses and records the location of BMMs in the blast pattern (pre-blast) and muckpile (post-blast). The BMM location data is transferred to the BMM Explorer software.

BMT offers two types of detector: Standard and Survey-enabled.

Standard Detector

5300 BMM-standard-detector
The standard detector measures BMM pre- and post-blast depth, and BMM precise location is surveyed by the mine site survey team.

  • Senses BMM depth in the muckpile
  • Able to detect BMMs up to a depth of 15m
Survey Enabled Detector


The survey-enabled detector (SED) makes detection a one step process through simultaneous recording of BMM depth and high precision GPS coordinates.

  • Senses BMM depth in the muckpile
  • Records BMM location to 10cm (4 in) location accuracy
  • Able to detect BMMs up to a depth of 15m
  • Compatible with Leica and Trimble GNSS receivers
  • Integrated survey reduces time on the muckpile

 

BMM Explorer

BMM Explorer calculates new dig lines for the shovels and 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:

  • Store BMM location data and blast design parameters in a database
  • Calculate 3D movement vectors
  • Transpose ore polygons to account for blast movement
  • Share this data in tables and blast plan diagrams with drill and blast and production
  • Export/import data in text-based formats, such at .csv or .txt, or in formats for mining software such as Datamine, GEMS, JKSimBlast, Minesight, ShotPlus5, Surpac and Vulcan
  • Plan the optimum number and location of BMMs for each blast monitored

BMM Explorer Planning Module

Financial Benefit: Value Calculator

BMT’s Value Calculator quantifies the additional revenue realised by blast movement monitoring: it calculates the potential value lost if ore polygons were mined in their pre-blast (in situ) location rather than their post-blast location.

Value Calculator:

  • Compares ore blocks in their pre- and post-blast locations
  • Calculates the tonnage and value of ore loss, dilution and misclassification
  • Reports the financial benefit the mine would realise if blast movement was accounted for

Value-calculator quantifies ore recovered

In this example, Value Calculator shows that this customer would have added more than US$600,000 by accounting for blast movement in this blast. This includes an additional 28,000 tonnes (31,000 Tons) of ore and 27,000 tonnes (29,700 Tons) of waste that was diverted 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