Welcome to the McCallum Rock Drilling & Blasting blog!

Vibration and Seismographs

One fact of life that we as commercial quarry blasters must accept is we at some point will need to deal with our neighbors in the community. Seismographs are a tool we rely heavily on to protect our neighbors. Our seismographs are equipped with electromagnetic...

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Borehole Deviation – Part II

Why is borehole deviation so important? If the holes are off just a couple of feet will it really make that big of a deal? The answer is a resounding YES. We design blasts on the surface of the material. We lay the holes out, measure the area, mark the spots where the...

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Borehole Deviation – Part I

Once the blast is designed and plans are in place, it is time to execute. With many industries, it is easy to track progress. Quality control checks are in place to ensure standards are maintained throughout the process of a given project. With drilling and blasting...

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Back and Side Break

One common factor in all blasts is back or side break. Simply put, back or side break is breakage that occurs OUTSIDE of the drill pattern. For example, if we are drilling on a 10 x 10 pattern, we are basically designing the blast to have each hole break 5’ in each...

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Face Profiling

There are a few critical parts of a blast that can make or break the performance of the blast design. One of the most important areas of the blast is the face. Face profiling is the process of measuring the free face of a blast. A lot of rock faces appear vertical but...

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Electronic Detonators

One of the most exciting and impactful technological developments in the explosives and mining industry today are electronic detonators, or electronic dets. What are detonators? Detonators are what makes blasts go. Each blast hole contains at least one detonator. This...

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Powder Factor – Distribution

In our previous blog post we discussed powder factor and how it is the foundation for all blast designs. Powder factor is the core measurement of how much force is being exerted per quantity of rock. The next element to consider with powder factor is distribution and...

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Powder Factor

Today we are going to talk about what role powder factor plays in our day-to-day applications of drilling and blasting. Powder factor is expressed in many different forms. Essentially it is a measurement of explosives per quantity of rock. The typical variation of...

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Welcome to our new website!

Greetings and welcome to our new website! Thanks for stopping by. We're still working on this section yet this area will serve as our outlet for industry related news stories, upcoming McCallum Rock Drilling events and announcements.

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