Because we are part of the community, we’re committed to being a good neighbor. As stated in our company values, We Care for the Community and Our Environment. This means we: listen to and work with the community, treat water as a precious resource, and minimize environmental impacts.
3D Blast Modeling for Green Site
This iron mine customer in the Midwest United States was reopening an existing operation and needed waste rock with which to re-establish haul roads. For this purpose the customer selected a green site for obtaining the material for building the roads which was approximately 200 ft from an existing lake.
3D Profile and Boretrak Used for Difficult Shot
This limestone quarry in the Eastern US is set up directly next to a main country road. The quarry is small in itself and the blasting is spaced throughout the year. The patterns for this quarry vary depending on where they are shooting. The main concern for this quarry is fragmentation and keeping all the rock inside of the quarry.
Blast Design Changes to Accommodate Poor Geology
This operation is removing a small section of bench and creating a final wall catch bench. Neighboring homes are within 750 feet of the shot area. In addition, poor geology results in excessive backbreak, requiring either paired holes, reduced front row spacing or angle holes.
Blast Design Using TITAN® XL 1000 and DigiShot®
As with any sump shot, blasters are shooting into a floor with no relief. This lack of relief causes higher vibration levels and increases the potential for vertical fly-rock and/or airblast. The quarry is located near a residential community and business warehouse park so control of the blast is essential. The extremely hard, massive granite places an additional challenge on the blaster.
Clean Face and Higher Frequencies
The DynoConsult® representative conducted a signature hole analysis to determine the appropriate timing using DYNO 42™ software. Following the analysis, a shot was executed using electronic detonators and the most appropriate timing recommended by DYNO 42.
Combining Paired Blastholes with Electronic Initiation Systems
Blast patterns designed with paired front row holes to combat excessive burden have proven effective in maintaining strict vibration limitations in close quarters. Better energy distribution in the blast and the reduced potential of energy loss due to hole interruption provides for better digging, enhanced cycle times and better floor conditions.
Controlling Vibration Damage
The ability of HotShot® electronic initiation system’s ability to maintain the integrity of highwalls was demonstrated in a test at Newcrest’s Telfer gold mine.
Conversion from Traditional Initiation to Modern Initiation
Inconsistent breakage & complaints from vibration off the blast events motivate two Indiana limestone quarry customers to convert from detonating cord and slider cast boosters to DigiShot® electronics and Spartan® cast boosters.
Dyno Nobel Blast Design and DigiShot Detonators Produce Excellent Results
The geologic formation varies throughout the pit from a fairly good fragmenting ‘blue’ stone to a very hard to break ‘green-white’ formation. In addition, both formations are loosely jointed with numerous slips running in unpredictable directions. On this particular blast, a major slip caused excessive burden on the face of the blast. The major challenge at this operation is the close proximity and density of surrounding communities, so vibration and air over-pressure must be addressed in any blast design.
DynoConsult Assists in Permit Change
DigiShot Electronic detonators, signature hole analysis provides means to achieve goal of zero increased impact to community regardless of shot size.