Open Cut » Drilling & Blasting
This report focuses on the development of novel mining explosives with the potential to solve the problem of Nitrogen Oxide (NOx) fumes after blasting. The toxicity of NOx and the impact of post blast emissions on licence to operate issues in the Australian Coal Mining Industry have been well documented.
This phase of the project had three objectives:
· To evaluate and understand the stability of HP based mixtures when in contact with different ground conditions. The aim was to guide a chemistry based solution to maximise product sleep time without the need for blasthole liners;
· Complete the detonation properties characterisation of Hydrogen peroxide (HP) based hybrid mixtures; and
· Improve the first version of the prototype manufacturing and delivery system demonstrated in project C23029 in preparation for mine based trials.
Originally, Phase 2 of the project also envisaged the implementation of preliminary mine based field trials, however during the first quarter, preliminary product stability tests conducted with rock and drill cutting samples from Acland and Curragh Mine, showed reactions occurring at times earlier than anticipated and there were marked differences between mine sites. Given these results, monitors agreed to focus on more detailed stability tests to understand the reactivity trigger mechanisms. There was agreement to postpone mine based trials to subsequent phases. Emphasis was then placed on establishing adequate laboratory facilities and focus on the stability testing program.
The research team also identified the need to update the preliminary business case reported in Project C2309. In this phase the cost of manufacturing and delivery of hybrid mixtures has been reported; and preliminary opportunities for cost optimisation identified.