New course is comming on July 2026
How to Calculate Quarry Production from Blast Design
How to Calculate Quarry Production from Blast Design By Petr Explosives Group & Practical Explosives Training School (PETS) One of the most important goals in quarry blasting is achieving the…
What Goes Into a Safe Quarry Blast? “A Beginner’s Guide to Blast Design”
What Goes Into a Safe Quarry Blast? A Beginner’s Guide to Blast Design By Petr Explosives Group & Practical Explosives Training School (PETS) If you’ve ever watched a quarry blast…
Blasting Misfires: What Every Blaster Needs to Know
Blasting Misfires: What Every Blaster Needs to Know By Petr Explosives Group & Practical Explosives Training School (PETS) If you’ve spent any time in the field, you know that misfires…
The Two “8 ms Rules” in Blasting
The Two “8 ms Rules” in Blasting: Why They’re Different and What It Means Today At Petr Explosives Group, students in our education classes often ask: “Why do people talk…
The 8 ms Rule: What It Really Means
The 8 ms Rule: What It Really Means – & Why It’s Time to Move Beyond It At Petr Explosives Group, we believe great blasting starts with understanding why we…
Row-to-Row vs. Hole-to-Hole Timing: Most Confused Concept in Blast Design
Row-to-Row vs. Hole-to-Hole Timing: The Most Important (and Most Confused) Concept in Blast Design Timing is one of the most critical factors in surface blasting — and also one of…
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