Byrock is a small village in northwestern New South Wales which is located 80 kilometres from Bourke. It is named after a rock hole, called Bai by the Nyammba tribe. It was once a stopping point for Cobb & Co coaches who used the Byrock Rock Holes to water their horses. By 1879 the Mulga Creek Hotel was being used as a Cobb & Co change station. The current population of Byrock is 26 people, quite a few emus, kangaroos and wild goats!

Boral has been operating Byrock quarry since 1986 when the operation was acquired from Far Western Stone Quarries Ply Ltd, who had operated the quarry since 1964. The quarry has a basalt rock of the Cenozoic mafic volcanic rocks which is around 60 million years old.

Mining is undertaken using traditional drill and bast techniques followed by excavation with either an excavator or a loader into dump trucks for transporting to the processing plant. Blasting is done annually which is then processed throughout the year.

Product from the quarry is transported to local road sealing plants, concrete plants and other construction markets in the Bourke, Brewarrina and Cobar Shires.