Many of the lakes on the volcanic plains don't have water in them but this large quarry at Ondit near Red Rock does. The Chesnut Teal, Coots and Black Ducks seemed to be enjoying it.
I know bluestone is essential as a crushed rock for road making and as a concrete aggregate. I know they use it to build up railway lines. I know they use it as building blocks and paving. But it does leave a rather big hole in the ground. At least it's not on the side of a mountain like the scoria quarries.
