my apologies, I now understand that these are just the art files and have no modinfo or Art Definition files that describes the folder locations for the artwork or how to incorporate them into the game.
I am still trying to figure out the modbuddy tool that comes with the WorldBuilder package,...[not included with disc-argh!-have to download and install with Steam-argh!-must tell it where everything is-double argh!]
There is a Resource_Expansion_Packs (v 9) found on the Steam Workshop that uses your artwork and includes Horem's, Barathor's, and Glacierheart's artwork. It generates the resources onto random maps and also enables them to be placed with the custom WorldBuilder maps but, it is either not yet fully functional or, it doesn't know where to find the artwork files.
Some of the resources do not show up in the game, but they can still be improved by the workers and the "invisible" resources do add production/gold/happiness values to the cities. Also, when placed on a map in the WorldBuilder, some of the resources show up as either, a white circle or, a red and grey checkered box on the map hex.
Again, I am still trying to figure out the modbuddy using the tutorials found on this site. Sadly, the tutorials are also incomplete or out-of-date.