Hi Ron
A "borrow pit" is where the road builders & Maintainers "Borrow" the rock, that they need to build up & maintain dirt roads.
Not that they ever intend to return it
We have Aprox 800km of dirt road between us & the next town of any size.
So there are lots of Borrow pits to choose from.
Here is one example below, the site of our GAA Astrocamp 2006, next W/E.