WorldWide Drilling Resource

Shallow Exploration Drillers Clinic Tel: 402-472-7550 jloomis3@unl.edu http://sedc.unl.edu South Atlantic Well Drillers “JUBILEE” Tel: 855-987-7469 Fax: 850-222-3019 kgordon@executiveoffice.org www.jubileewatershow.com South Carolina Ground Water Association Tel: 803-356-6809 Fax: 803-356-6826 scgwa@sc.rr.com www.scgwa.org South Dakota Well Drillers Association Tel: 605-734-6631 www.sdwda.org Southwest Mississippi Community College Well Construction Technology Tel: 601-276-3738 cdunn@smcc.edu Tennessee Water Well Association Tel: 865-761-4363 info@tnwaterwellassociation.org WorldWide Drilling Resource ® is proud to be a member of these associations. Texas Alliance of Energy Producers Tel: 940-723-4131 Fax: 940-723-4132 joannb@texasalliance.org www.texasalliance.org Texas Ground Water Association Tel: 512-472-7437 Fax: 512-472-0537 drobbins@twca.org www.tgwa.org Utah Ground Water Association Tel: 801-541-7259 www.utahgroundwater.org Virginia Water Well Association Tel: 804-387-8395 Fax: 804-302-7978 info@vawaterwellassociation.org www.vawaterwellassociation.org West Virginia Water Well Drillers Assn. Tel: 304-636-6025 Fax: 304-636-0231 framedrilling@frontier.com Wisconsin Water Well Association Tel: 608-326-0935 Fax: 608-326-0966 info@wisconsinwaterwell.com www.wisconsinwaterwell.com Women In Mining 866-537-9694 wim@womeninmining.org www.womeninmining.org Wyoming Water Well Association Tel: 307-267-3806 wywaterwell@gmail.com www.wywaterwell.org 302-684-3197 FAX: 302-384-0643 142 Broadkill Rd. • Milton, DE 19968 www.atlantic-screen.com email: atlantic@ce.net Manufacturers of Slotted & Perforated Pipe ranging from ½” to 24” diameter Atlantic Screen & Mfg., Inc. • Well Rehab. Products • Manholes • Bentonite • Filter Sock • Inline Chemical Mixers • Sampling Bailers • Clear PVC Pipe • Locking Caps Blasting Back to the Basics Adapted from Information by U.S. Department of the Interior’s Office of Surface Mining When it comes to exploration blastholes, the purpose of drilling into the rock is to provide the actual “blasthole”, which is where explosives can be loaded. Good drilling practices include carefully monitoring drill rig operating parameters, tak- ing careful notes of the changes in geology during drilling, and effectively communicating to the blasting crew any unusual conditions encountered during drilling which may affect blast- ing results or require changes to hole loading practices. The basic components of the drill rig are the rig itself, which supplies the power to mobilize, drill rock, and remove the drill cuttings from the hole; the mounting; the drill steels or drill string; and the drill bit. Rigs can be truck- or track-mounted. Rubber tire rigs are capable of traveling quick- ly from one jobsite to another; however, they should not be used on rough terrain. Conversely, track-mounted rigs are able to traverse rough terrain. There are two basic drilling methods used to create the blasthole - percussion drilling and rotary drilling. In percussion drilling, the blasthole is created by way of a piston which delivers rapid impacts to the drill steel, thereby transfering ener- gy to the drill bit. The blows to the rock down hole are delivered by the bit, while a rotational device ensures the bit impacts a new rock surface with each blow. A feed force is applied to maintain rock / bit contact. Compressed air is used to remove or flush the drill cuttings from the hole, which ad- vances the hole depth at an efficient rate. The piston can either be mounted out of hole or down hole for quiet and efficient drilling. In rotary drilling, the blasthole is created by means of pulldown pressure on the bit, combined with rotation power. Compressed air is used in sufficient volume to ensure a minimum velocity of upward airflow which both flushes drill cuttings and keeps the hole bottom cleaned. Rotary drilling method. Percussion drilling method. 32 NOVEMBER 2017 WorldWide Drilling Resource ®