I came across this video -- just sharing --
This garden was built mainly from wood chips.
The method used to break them down and build the soil
was with azomite rock dust and mushroom spores and white cap mushrooms
http://www.youtube.com/watch?v=MEkFFRjDkvs
The caution always is... to get wood chips from clean, unsprayed wood
and to use the chips as mulch rather than mixing into the soil.
She also talking about how minerals revived her old apple tree.