Fire in the hole
Better aggregate production begins with proper drilling and blasting. Here’s a selection of drilling and blasting equipment on the market today.
By Kerry Clines, Senior Editor
Atlas Copco says its ROC T35M is equipped with a COP 1840 rock drill, which uses less energy to achieve high penetration rates, and a modular design developed for the next generation of surface crawlers. The rig’s hydraulic-based control system adjusts in real time to match rock conditions. Cylinder-driven feeding is said to ensure constant contact, resulting in higher quality, straight holes.
Sandvik says its DP1500i is an intelligent, hydraulic, self-propelled, crawler-based top hammer drill. Intelligent systems provide information on the condition of the drill and the work performed, among other performance factors. The drill’s new GT60 system, available in 60-, 87-, and 96-mm diameter sizes, features a shoulder-drive tube design said to deliver added life and straight holes.
Raimonde Drilling says its Versa-Sonic Drill produces high-frequency downward-pressure vibrations, which result in fast and accurate drilling. The drill is said to be capable of super speed in unconsolidated material, truly representative continuous samples, easy installation of well materials and instrumentation, and less derived waste.
J.H. Fletcher’s new Graphic Operator Angle Display (GOAD) system uses sensors on the drill boom and feed mechanisms that display hole angles and depth of drilling on an in-cab monitor, allowing precise hole placement and direction. According to the company, more tons at a lower cost is one of the advantages of the system, as well as improved roof and rib control, which reduces scaling time and improves worker safety. The system also monitors the flushing pressure, so that when the pressure drops, the system automatically retracts the drill and steel.
The REICHdrill C-550-DII can drill 5- to 6 3/4-inch holes to a maximum depth of 148 feet with 30-foot drill pipe. Maximum rated pull down is 35,000 pounds with bit loading to 40,000 pounds. It is available as a low- or high-pressure drill with 900 to 1,070 cubic feet per minute for rotary and DTH.
These blasting products can help you achieve a good blast, which can lessen the amount of crushing required to get the saleable material desired.
Mocap says its Vari-Stem blasting plugs improve blast fragmentation, reducing average rock size by up to 27 percent. The plugs are also said to control fly rock and provide savings in secondary breakage and downstream costs by reducing the amount of oversized rock. The company says its plugs are the lowest cost means of improving quarry output.
Instantel says its Minimate and Blastmate vibration and overpressure monitors feature specialized sensors and a variety of recording formats that increase functionality. The Minimate Pro systems feature a rugged design, innovative enhancements, and advanced monitoring. The Minimate Plus monitor is small, rugged, portable, and easy to use, especially in short-term applications. The Blastmate offers a variety of sensors, including a triaxial velocity sensor.
Dyno Nobel says its DigiShot Plus electronic initiating system is capable of initiating up to 1,800 total detonators per blast and up to 15 detonators per hole and offers added protection for blasters with remote firing capability — up to 2 miles line of sight. The system offers a range of choices for timing the blast. Delays are variable between 1 millisecond and 20 seconds. Timing designs can be input into the Bench Box manually, auto-programmed, or downloaded directly with PC-based blast design software.
GeoSonics/Vibra-Tech offers a complete line of seismic monitoring units for use in the aggregates industry. Its SSU series seismographs feature an ISEE-compliant external geophone with a microphone, internal memory, easy-to-read LCD, heavy-duty stick and twist metal connectors, long-life rechargeable lead-acid battery, two independent threshold alarms, imperial/metric support, flexible user interface for on-site programming, free analysis software, and one-year warranty.
Orica says its uni tronic blast box BB310R is a remote blasting solution. The remote blast box can be placed in proximity to the blast pattern and can communicate via radio modem to the firing control box, which can be positioned at a point of safety up to 6,500 feet from the blast pattern, providing increased safety for personnel and equipment. The unit is compatible with the company’s existing uni tronic Scanner 110 and uni tronic Scanner 120 equipment and is equipped with a Bluetooth module allowing easy download of scanned detonator details.