Aug 18, 2021· A steel slag driveway costs $1.33 to $2 per square foot, $35 to $54 per cubic yard or $25 to $39 per ton. Steel slag rock for driveways is often 1" to 1.25" long, though quarry process steel slag of 0.50" to dust is the cheapest. Steel slag is more durable than crushed limestone. River rock driveway
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