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Thanks everybody, that will give a few options to investigate.

Thanks all - Ive done a little bit more investigation on the project and your comments make sense. Seems my basalt is not uniform My trenches are a network of drainage trenches up to 4m deep Through a existing residential area so blasting is not favorable due to the potential damage to the...

Hi I'm developing a methodology for trenching in a basalt area in preparation for drain laying. Once the final design drops out I'm expecting several kilometers of basalt will have to be removed. My initial investigations have eliminated explosives due to residents and other existing services...