Frequently Asked Questions
Why is blasting required?
Blasting is an essential part of our economy. Minerals, metallic ores, coals, and aggregates all are extracted from the earth. The first step in this process is blasting. These materials can be extremely hard and cannot be removed mechanically until fragmented and displaced.
Is blasting going to damage my home or well?
No. We strictly adhere to standards that your state, the United States Bureau of Mines, and the Office of Surface Mining have determined to be safe blasting criteria. These standards are long proven and scientifically tested to keep structures safe from vibration.
Can blasting be done close to existing structures?
Yes. Our company has many years of experience with technical blasting within close proximity of structures. We have skilled employees that use various forms of vibration prediction. We’ve completed projects within five feet of structures with no damage incurred.
What is a pre-blast survey?
The survey is an inspection, usually photographed and/or videotaped, of the structures to document conditions prior to blasting. This is a standard procedure that we employ prior to blasting commencement. An independent third party will survey structures located close to the blast area. If damage is suspected, the pre-blast survey company will check for discrepancies.
How do we measure vibration?
McCallum Rock Drilling has many seismographs and operators that measure vibration. Seismographs are calibrated annually by the manufacturer to ensure accuracy. All seismographs also have a self-check mode that runs prior to monitoring.
Am I going to feel or hear the blast?
Yes, vibration and noise are inherent by-products of a blast, all of which can be controlled to minimize human perception. All blasts are carefully designed by professionals and results are predetermined.
Who needs to be contacted prior to blasting commencing?
We contact any local law enforcement, fire departments, and emergency response prior to blasting operations. In addition, we contact anyone within a 300 foot radius from a blasting operation. This is done verbally and/or by letter. This is standard for any project we do. Permits for blasting are also handled by McCallum Rock Drilling.
Why isn’t rock hammering or chipping used to excavate aggregate?
Rock hammering is slow, inefficient, costly, and has the same inherent properties of blasting on a smaller scale. Blasting can actually be quieter than rock hammering, and takes much less time. A typical blast duration is usually 1 to 3 seconds, while rock hammering can take over two weeks to displace the same amount of volume incurred by a single blast.
How is flyrock contained?
By definition, flyrock is debris that is propelled outside of the blast zone. Shot design, powder factor, stemming material, delay sequence, and blasting mats are all factors considered to control flyrock. Every blast we design and shoot uses proper principals for all applications to control flyrock.
How long will this project take?
Every project is different and duration is based on a number of factors. McCallum Rock Drilling has a large fleet of efficient and powerful drills and highly skilled and motivated employees to get every project completed in the safest, fastest and best manner possible.