Can river rock be used as a subbase in place of crushed stone?
$begingroup$ River rock is more expensive because there is a very finite supply, and stripping the rock from a river bed destroys the river's ecosystem. On the other hand a stone quarry can mine and crush rock strata that are hundreds of feet thick. For example one of the largest quarries in the UK is mining a limestone bed 1200 feet thick, and produces more than 5 million tons of crushed ...