Related Manuals for BMT Blast Movement Monitor
Summary of Contents for BMT Blast Movement Monitor
- Page 1 System Manual ® Monitoring Procedures Solutions to Reduce Ore Loss and Dilution...
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Page 2: Table Of Contents
System Manual – Monitoring Procedures ® ABLE OF ONTENTS ® System Manual _____________________________________________________________ 1 Monitoring Procedures _____________________________________________________________ 1 Introduction _________________________________________________________________ 1 Planning the Location of BMM ® s _______________________________________________ 2 Introduction ........................2 ® Separation ......................2 ® Location for Grade Control ................. 3 Location for Blast Dynamics ................ -
Page 3: Bmm ® System Manual
There are Quick Reference Guides available for download from the VIP-Zone on the BMT website. These are step-by-step procedures for monitoring a blast and processing the data. New users should print and refer to them regularly until the procedures are familiar. -
Page 4: Planning The Location Of Bmm S
Detector. Therefore, it is possible to install more than one BMM per hole and/or place ® ® s close together – assuming they are of a different colour. If there is inadequate separation www.bmt.com.au... -
Page 5: Bmm ® Location For Grade Control
– consider the expected movement distance and direction (use the planned initiation timing contours) to ensure s don’t end up within the minimum separation distance if they move towards ® each other (refer to Section 2.2). www.bmt.com.au... -
Page 6: Bmm ® Location For Blast Dynamics
This is typically close to the mid-bench level but could be adjusted under certain circumstances. Contact a BMT consultant if you want to know more. - Page 7 V, then the centreline of the V must be more than 3 rows from any BMM ® and the same timing on each side of the centreline. Select the depths to give a complete coverage of the bench height, including sub-drill. www.bmt.com.au...
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Page 8: Monitoring Holes
Positions 1-3 may be better from a production perspective (half way between blast holes). Whichever position you choose, it is important to get it close to mid-way between blast holes. www.bmt.com.au... -
Page 9: Monitoring Hole Diameter
10–12 hour window. To provide more flexibility, there is the ability to program the BMM ® s to start transmitting up to 36 hours in the future. See Section 3.3 for more information on this topic. www.bmt.com.au... -
Page 10: Installation Procedure
Map of blast pattern and planned BMM locations ® Pencil or pen — to write on map Mesh Bags — if wet holes are expected (see Section 3.4) ® Shovels — to backfill holes if required www.bmt.com.au... - Page 11 Activator. If the BMM is not transmitting, try a different activator angle and press ® BMM On button again. Try several times if necessary. If the BMM ® will not activate, identify with marking pen, and use another BMM ® www.bmt.com.au...
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Page 12: Delayed Start
BMMs to switch on some time in the near future. For example: Cannot access the muckpile immediately after the blast due to a regulated safe settling period when blasting through underground workings. Late afternoon blast means end of shift and/or fading light. www.bmt.com.au... -
Page 13: Wet Holes
The easiest way to sink the BMM into the wet hole is to use a small amount of rock to increase ® its weight and density. BMT supplies mesh bags to make this process quick and easy and the procedure is set out below. www.bmt.com.au... -
Page 14: Test Button On The Activator
– cycling indefinitely. If this early Test Mode is initialised, then it must be deactivated before the BMM ® can be activated normally (see the Activator manual for the procedure). www.bmt.com.au... -
Page 15: Bmm ® Detection
and . This is critical when conducting the final pin-pointing and recording the ultimate signal strength, although it is not necessary to be perfect when conducting the initial traverse of the muckpile to get close to the BMM ® www.bmt.com.au... -
Page 16: Detecting Procedure - Locating The Peak Signal
When searching for the peak signal, you are only interested in a relative change of the signal strength, not the actual signal strength number. At all times…Is the signal increasing or decreasing? In practice, the procedure is: www.bmt.com.au... - Page 17 Always walk 2-3 m past this first peak to be sure it is not the “phantom peak” (discussed in Section 4.6). o Back up to about where the maximum was. You are now at location in the diagram to the right. www.bmt.com.au...
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Page 18: Graphical Display
The most efficient search procedure, set out in this manual, is based on simply knowing whether the signal is increasing or decreasing, and indeed, looking for the point where it changes from increasing to decreasing. The graphical display clearly shows these humps, even if the signal is www.bmt.com.au... -
Page 19: Validating The Peak
(within reason). If it increases at all in any direction, then you are not directly above the BMM ® , so keep looking. This procedure should be carried out for each BMM ® www.bmt.com.au... -
Page 20: Sample Field Shapes
The distance from the phantom peak to the base of the real peak is about 5 m so if in doubt, take another few steps in the original direction (the null is about one step away). Null Strong Signal Stronger (with null and phantom peak) Weak Signal www.bmt.com.au... -
Page 21: Procedures To Improve Efficiency
Detector to each side or rotate the Detector looking for a signal. If you have just walked 10 m and seen no signal increase, then moving it a metre to the right is unlikely to help – keep walking. www.bmt.com.au... -
Page 22: Depth Calibration
Electromagnetic interference – normally not a problem on the blast (see Section 3.2). A depth calibration should be conducted for each site to provide a site-specific relationship and then repeated if any of the above items change significantly. BMT will notify users if equipment changes require a new calibration. -
Page 23: Using The Data
The following items can be used to guide this process: A blasted muckpile is likely to have unstable slopes, loose rocks of various sizes, uneven ground and cavities. There is a risk of personal injury due to falling, tripping and rock impact. www.bmt.com.au... - Page 24 2: Use of Explosives”, the safe distance to maintain between a BMM ® and an electric detonator is 20 m (see relevant table below). Note: This does not include electronic detonators since they are intrinsically safe from electro-magnetic fields. www.bmt.com.au...
- Page 25 System Manual – Monitoring Procedures ® www.bmt.com.au...
- Page 26 Copyright Act 1968, no part may be reproduced by any process without written permission from Blast Movement Technologies, PO Box 73, Bellbowrie, Queensland, Australia. The BMT logo and BMM ® are the registered trademarks of Blast Movement Technologies, ABN 57 105 683 470.
- Page 27 ONTACT ETAILS Blast Movement Technologies Phone: +61 (0)7 3202 9499 PO Box 73 Fax: +61 (0)7 3202 9472 Bellbowrie Qld 4070 Email: office@bmt.com.au AUSTRALIA www.bmt.com.au...
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