The modern world feels like steel and glass, but it actually starts with something far less glamorous: stone, sand, and gravel. We sit down with Sharon Armstrong, Executive Director of the Ontario Stone, Sand, and Gravel Association, to unpack the “hidden in plain sight” resource that becomes our roads, sidewalks, bridges, hospitals, schools, and homes, and why most of us only notice it when a gravel truck slows us down.

We get practical fast. Sharon explains what “aggregate” really means, how road beds are layered and compacted to survive Ontario’s freeze-thaw cycle, and why a Roman road cross-section is not as different from today’s as you might think. We also clear up the terms people mix up constantly: pits versus quarries, sand versus gravel versus crushed stone, and why “recipes” and specifications change depending on whether you’re building a driveway, a basement slab, or a piece of major city infrastructure.

Then we zoom out to the hard part: approvals, public perception, and the real trade-offs. Sharon walks us through what it takes to open or expand a site, including hydrogeology studies, air and noise work, natural heritage reviews, public consultation, zoning, and in many areas duty to consult with First Nations. We talk about why the process can stretch to 10 to 12 years, why transport is often the biggest cost and emissions driver, and how rehabilitation can turn former sites into parks, lakes, golf courses, and even aquaculture.