It is loosely based on Clackamas Coots' mix. I used:
Promix HP 50%
Worm Castings 50% but with added perlite for extra aeration.
That is my base mix. To this I added the following amendments: (per cu.ft.)
1 cup Oyster shell flour
1 cup Eggshells crushed
2 cup Kelp meal
1 cup Alfalfa meal
1/2 cup Dolomite lime
1/2 cup Mineralized Phosphate
1 cup blood meal
1 cup bone meal
This was then moistened with LAB (Lactic Acid Bacteria) and left to stew for a couple of weeks. My first plant with this mix was transplanted (with 1" tail) then sowed some White Clover as a cover crop then mulched with Timothy Hay. Then I simply followed a wet/dry cycle to emcourage root growth.
At the second planting, I top dressed with neem meal, karanja cake and malted barley then watered with molasses/kelp tea.
There are a few recipes floating around but if you do a search for Clackamas Coots organic soil, you should be able to find it. I didn't follow the recipe to the letter but used what was available locally.
My next mix will skip the blood meal as I detected N toxicity, not enough to burn but still noticeable. Hope this helps.
edit:
In looking back at my notes, I added 2 cups of kelp meal. I also have red wiggler worms. So far no escapees LOL.