Normally once you’re over-leveled the league mechanic would stop spawning with the exception of level 60 areas and above, the exception is now level 65 areas and above.
The Quarry is an area with a Waypoint in Act 9. It is connected to The Tunnel, The Refinery and The Belly of the Beast (Act 9).
Once, it was one of the best places to farm currency and valuable items.
Nowadays, GGG reduces its drop rate.