Question Using explosives as a source, how deep should we drill the shot holes?

That depends on a variety of factors such as the amount of explosives to be used per shot, your desired depth of exploration, etc. The answer is ideally that you drill the shot holes deep enough to avoid blowouts, but no deeper. If you are using explosives we recommend the use of the HVB-1 Blaster. We have HVB-1 Blasters available through our Rental Department as well.