Design and Design Review

Examples of Design in Action...

Arygle Diamond Mine Drawbell and Undercut Design

Drawbell drill pattern designs modified for single shot firing. This change was made in conjunction with drill accuracy controls leading to a 50% reduction in redrill meters.

Undercut redesign to reduce sensitivity to adverse ground conditions…

… resulted in 50% increase in undercut rate with corresponding reduction in rework.

Oly Tolgoi Drawbell and Undercut Design

Drawbell and Undercut design for Rio Tinto’s OT Operation.

Olympic Dam Slot Re-Design

Re-design of the OD slots to reduce sensitivity to drill deviation. This required the development of statistical models to assess the effect of drill deviation when firing raises and slots. The outcome was a widened slot design that delivered an 80% reduction in slot bridges.

The effect of drill deviation in raises and slots was modelled using monte-carlo analysis. This enabled a range of designs to be assessed for sensitivity to drill error.


Coal Loss and Dilution

Between 2007 and 2010 engaged by BMA to address Coal Loss and Dilution as part of the ‘Last Drop’ project. Many of the project elements were focussed on the delivery of design and variance between the design and the as-built.

Presplit Review

Modifications to presplit designs based on standard tensile failure models resulted in significant improvements to presplit performance. Associated benefits including increased bucket life were identified.

Box Cut Re-Design

Box Cut re-design driven by management of relief resulted in increased blast performance at overall reduction in cost and powder factor.


Somilo Slot

Re-design of production slots at Somilo Gold in West Africa. Resulting in elimination of persistent slot bridges.

Cast to Standup Transitions

Modification to design standards for both drilling and loading to achieve transition from cast to standup blasting for strips with highwalls over 50m.

Interactive Timing

Interactive timing is a concept where independent holes are fired with reduced time separation so that the material around the holes is impacted by energy from multiple holes.

Interactive timing is not realistic for dependent holes owing to the requirement for burden relief.

Interactive timing is relevant for holes within a maximum distance of around 1.5 burdens:

The delay between holes is not before the compression wave reaches the free face and before first movement. In the following example interactive timing is between 1.5 and 6 milliseconds.

Note the distance between holes (spacing) the burden and the P wave velocity all influence interactive timing. Therefore there is a not a single ‘right’ delay between or within a pattern but rather a range of delays to meet the requirements of interactive timing.

When determining timing for interactive timing the proximity of interactive holes is a limitation.

Owing to this firing is limited to row by row, Vee or Vee 1 only:

To setup interactive timing using a timing contour for electronic initiation it is a simple matter to align the contour to the true spacing and then rotate by the required angle:

In the following example the interactive delay of 4 milliseconds is achieved with a contour line rotated 1.07 degrees.

The application of interactive timing determines the true burden and spacing. These should be considered in drill pattern design.

Rather than blindly aligning the rows to the available free face or blast perimeter consideration should be given to aligning the rows (spacing) perpendicular to the expected direction of movement.

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Complete your details below and we’ll email you a quote for the BLASTPLAN ll: Drill and Blast Design Application. We’ll respond to any comments or questions you have in a separate email.

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BlastPlan-Pro software is available for purchase on the Blast Management International web site. This software products is available for download and is fully functional. We provide a 30-day free trial period to let you fully evaluate the software product to ensure it meets your needs prior to making a purchase decision.

During your trial period, our support staff are available to assist in installation and configuration via email, ticket or telephone. We strongly recommend that all customers download, install, and test the trial version of any BMI product prior to making a purchase.

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After a cleared payment on the purchase of one of our products occurs, you will receive an email with the serial number required to unlock the software. Once this information is emailed to you, no refund will be given. This policy is in place since it would be impossible for you to return your registered version of our software.

We cannot issue a refund for any BMI software product given this licensing model. Please take advantage of the 30-day trial before you complete your purchase.

Refund Under Exceptional Circumstances

In rare instances and only within 30 days of purchase, if due to technical difficulties or platform incompatibilities the software will not function, we may, at our discretion, issue a refund minus our order processing and banking fees (up to 25% of the purchase price). In such instances, we require that you provide enough information for us to positively identify your purchase transaction (e.g., order number, your company name, date of transaction, purchase code, number of licenses purchased, etc.). If we are able to positively identify your order, and if your request is made within 30 days of purchase, you must submit to us a letter of destruction of software on your company letterhead before we will process the refund. BMI is not responsible for lost, delayed, or misdirected mail or email, delays for downloading, or other communication system delays.

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Students undertaking nationally recognised VET courses are required to have a Unique Student Identifier (USI). You can apply for your USI at

The USI is a reference number that is required if you are a new or continuing student undertaking accredited vocational study at BMI.

Who does the government require to have a USI?

You need a USI if you are undertaking a Nationally Recognised Training.  Without one, you will not be able to get your qualification unless you are undertaking a BMI course outside of Australia as an International Student.

When will you need to provide your USI to BMI?

You will need to have your USI on hand when completing the online enrolment form as part of the enrolment process at commencement of training.

Trainer Opportunity

Are you an experienced and motivated individual who wants to develop or expand your own business providing industry training in each of the Surface Drill and Blast Units of Competency? If so, we’re looking for you!

Blast Management International (BMI) is a Registered Training Organisation (RTO #31459) providing high quality training across most blasting industries including surface, underground metalliferous, construction, oil and gas, explosives/DG driver and special effects.

As an Independent Trainer aligned with BMI you will have access to training and assessment materials as well as marketing and sales support that will enable you to develop your own business providing Nationally Recognised Training to your own clients.

These units support applications for Shotfirer Licenses and may include those aimed at Drill and Blast Engineers, Supervisors and Superintendents.

This opportunity will suit people with skills in both training and surface blasting looking to leverage your industry knowledge and contacts into a sustainable, profitable business opportunity.

For more information or to arrange a confidential discussion email me at

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