We’re committed to being a good neighbor and we listen to and work with the community to minimize any unwanted impacts from stone blasting.
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 and DS
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 predictable 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.
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 signaturehole 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.
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
Electronic Detonator Precision & Signature Hole Analysis Provide New Alternatives for Pipeline Construction
Utilization of Signature Hole Analysis (SHA) combined with DigiShot® electronic detonators demonstrated how close proximity blasting can be achieved even with very conservative vibration limitations.
Electronic Detonator Precision and Timing Optimization Leads to Lower Costs and Reduced Community Perception
This Midwest quarry customer needed help to optimize their blasting program and to reduce risk exposure from blast complaints. Dyno Nobel proposed a transition to DigiShot® electronic detonators. First, a Signature Hole Analysis (SHA) program was introduced to aid in determining firing times for reducing peak particle velocity and enhancing high frequencies to minimize structure response.