Mine is on the surface Bug
Bugs in Minecraft PE are rare. Just one year ago you could find them at almost every turn. But Mojang are working hard on them.
We have prepared for you fresh-found a bug, but rather a seed, where there was the generation of the mine on the surface.
Seed Number: 616
Versions: 0.17.0, 0.16.0, 0.15.6, 0.15.4, 0.15.0