i do that a lot, go exploring/treasure hunting for a few hours find half a dozen exposed dungeons, loot the chests take the mossy cobble and go on my way. usually leave the spawner though incase someone else finds it and wants to make a grinder.
You could make a small fortune in finder's fees for sharing the coordinates after the reset-- hint, hint
SMP2, North Outpost, I'll post the coords later. It's a small vessel that probably won't hurt anyone.
haha yeah i never took down coords before because i didnt think of it until after people were asking about blaze spawners.. found stacks of them lol. i will note down coords in future for sure in the new world. more than happy to share for free though