what type of elevator is recommended when the bedroock is near the surface? hydraulic , traction or MRL ??

If bedrock is near the surface, hydraulic is out. MRL sounds like the right choice for this. It has a very shallow well.
Here's a nice link to types of elevators and shows well why not to go Hydraulic, here.
https://www.archtoolbox.com/materials-systems/vertical-circulation/elevatortypes.html

Just wanted to share this link. I think the answer can be Holeless Hydraulic or MRL.

http://elevation.wikia.com/wiki/Hydraulic_elevators