Ore is generated in both regular and jungle trees. Junglewood has a higher chance of spawning ore. All logs except coalwood logs need to be smelted to get their resources, coalwood just needs to be crafted. Place any orewood log (doesn't matter if it is facing up or sideways) next to water and it will sprout papyrus-like plants that drop their respective resources when they are harvested. They grow at about the same rate as papyrus (which isn't particularly fast), and have a max grow height just like it as well, the code is pretty much the same. Both junglewood and oak wood grow plants at the same rate.
A huge thank you to /u/Thermal--Shock for suggesting harvestable plants.
Also take a look at Gravelpunch's mod, Mineral Trees. I had no part in the development of this but figured I'd give him a mention, especially since some may prefer that mod to mine. <3
Changelog:
1.0 to 1.1: Orewood can now be placed near water to grow plants. Coalwood no longer just drops a coal lump, it must be crafted. Also fixed a typo in the names prior to the 1.1 release.



License: WTFPL for code and textures are Creative Commons.
Mod dependencies: default
GitHub
Download .ZIP
Todo:
Clean up repetitive code for better readability. [Maybe someday]
Add support for ores of other mods. [ASAP]