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Ron Kruger commented on Baagi Mekgwe's blog post Technologies to improve the quality of drilling
"There is somevery good information at the following website that you may find usefull (some is basic but they offer webinars and videos of various methods): 
https://www.rpmdrilling.co.za/blast-hole-drilling-process/ 
 
Hope it helps,
Ron"
Mar 27, 2020