These 1st 5 links are JMOD design docs that I found interesting & bookmarked to review again closer to the Mining & Smithing rework.
It's possible that 1 of these links is the main link that links to everything else.
But this is just what I bookmarked for later.
This contains a lot of information that I didn't know - stuff not contained on wiki.
It's worth scanning through just to see if any sections interest you.
https://docs.google.com/document/d/12wBYpgD6FpoHk7w9cKVvxYdAj6twoQwI22fCY9uXuDM/edit#heading=h.a9qp5rlxncrk
https://docs.google.com/document/d/1duk-MoaoIXByaZvVCZmuk0KVWdfs2vL4Mj-EaZmafu4/edit
https://docs.google.com/document/d/1pAxVv6In8TQ52XLh3ZUSeQkTkVhD84qATjhyzU76C_U/edit
https://docs.google.com/document/d/12wBYpgD6FpoHk7w9cKVvxYdAj6twoQwI22fCY9uXuDM/edit#heading=h.zbzlzgqntofo
https://docs.google.com/document/d/1YTW--SnG2me00FHY3QjoNx_wQ8oJuQmuClpQ1tDeDc4/edit
This last link is a map of where ores will be found post update.
It's not so important right now, I'm sure this will be made clearer at the time.
NOTE WELL: My pc didn't like this file while I had the other docs open.
I recommend viewing this before or after the other links.
https://docs.google.com/presentation/d/14VoSwspQCyi_DY9WGL7XrIBvyJqluOa-bCPc2a8R9cU/edit#slide=id.g39636a6428_0_0