Not sure if this is known bug or not. There is a "Goblin Mines Minigame Debt" bug in the official bug list, but no description.
Anyway, when a toon dies in Goblin Games minigame, the headstone shows up at the point of death. Problem is that you can't get back there same day. And by the next day, your debt is likely cleared anyway, so the stone recovery mechanism is useless.
All the other instances pop headstone at the entrance to the instance. Goblin Games should too.
-- Rustyx --- 92R / 92S / 92M on Reni (Guild KnightShift). Yes, running the new FOTM R/M, cause I am not elf enough to be WD/S.
Oh, and people who have more than 3 classes are clinically insane.