There is no need to cut down bushes with a hatched, or smashing the ground with a pikaxe.
The only thing you need, to free a treasure is a shovel and a good mining skill.
There are 18 different ground textures and some of these aren´t digable.
Grafics, like stones, rocks or trees and little bushes, aren´t
important. You can go next to them and digging beneath.
The Tile you`re digging on, isn´t the Tile under your Char`s feet.
It`s the Tile in front of you.
If you`re unlucky, your treasure is under one of those Tiles, then you can´t dig it up.
These maps are junk.
Non-digable grounds are:
(bridges, rocky ground, caveground, rockwalls, wooden floor, boardwalks, lava, under walls, cobbled ground, water and carpet )
Digable grounds are:
(acre, grasland, loamy ground, sand, snow,forest soil and red wood)
Im a link, to the Wiki
hope that helped.