DTH is short for “down-the-hole”. Since the DTH method was originally developed to drill large-diameter holes downwards in surface-drilling applications, its name originated from the fact that the percussion mechanism followed the bit down into the hole. Applications were later found for the DTH method underground, where the direction of drilling is generally upwards instead of downwards.
[pdf] Search and apply for the latest Water well driller jobs. Verified employers. Competitive salary. Full-time, temporary, and part-time jobs. Job email alerts. Free, fast and easy way find Water well driller jobs of 1.195.000+ current vacancies in USA and abroad. Start your new career right now!
[pdf] 
