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Case Studies & Conference Papers  

This library contains Orica Mining Services published Conference Papers and Case Studies in downloadable PDF format.

 

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Blasting of Large Vertical Rock Protrusions
05/08/2014

During free-dig excavation works in the south-western pit development area in the latter half of 2013, it was
discovered that several large protrusions of fused basalt columns were present along the pit face side of
the overburden stripping works. These protrusions created an issue for the quarry as the rock was solid enough to require blasting as they could not be broken down efficiently with a rock hammer, and were quite large in size (between 6- 10m diameter, and 5-7m high).

Removing overhanging face Oparure Road – Waitomo, New Zealand
04/03/2014

Transfield Services Ltd. Infrastructure division (Transfield) provides road maintenance services to the Waitomo District Council (WDC) on the North Island of New Zealand. Transfield were recently engaged by WDC to rehabilitate pavement on Oparure and Haurua Road . An optimal blast design was formulated by taking data collected using a Measurement Devices Ltd’s (MDL) Quarryman laser profiler and importing it into Orica’s ShotPLUS 5 software.

Controlling Overbreak in Development Mining
24/10/2013

Golden Grove is an underground and open pit base and precious metal mine owned by Minerals and Metals Group (MMG).The mine is currently extending the depth of its operations beyond 1000m. At these depths they are noticing that the quality of the rock is worsening and the foliation and alteration is increasing in complexity.
The fractured and jointed ground conditions at Scuddles have led to an increase in overbreak in the development drives, variation between the “as designed” volume and the “as blasted” volumes of some drives exceeded 30%. * Data sourced during benchmarking phase MMG Golden Grove management recognized that such high levels of overbreak were having a significant cost impost to the operation and have been working the GBF team to find solutions to reduce this level of overbreak.

Blast Fume Reduction - Ensham QLD
03/09/2013

“Ensham resources had been investigating opportunities to eliminate any risk associated with blasting fumes for a period of time and had attempted several other mitigation techniques, to little success. Mid 2012, Orica were asked to propose a solution and undertake trials in the Northern Pits. Their scope was to provide a confidence level of “0” rated fume, whilst still ensuring production rates were unaffected. Ensham then embarked on a 7 month trial period with Orica and their technical support team. As indicated in this report, the results were highly successful with no reportable fume events and consistent production rates. Ensham has now trialled 3 Flexigel Coal densities - fine tuning the results, with all products proving very successful and beneficial”.

Selection of Blasting Limits for Quarries and Civil Construction Projects
01/08/2012

The selection of appropriate blasting vibration limits for civil construction projects and quarry operations has a major influence on the overall cost, duration, and environmental impact of a project. In some cases the application of an overly conservative limit may affect the financial viability of a project to a point where it may not even commence, despite it going through all the relevant planning approvals. Low vibration limits have resulted in explosive blasting being precluded from some major projects in favour of slower, more disruptive, mechanical methods such as ripping and hammering. This has prolonged the duration of the projects and extended the community’s exposure to excavation noise and dust.

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