I was a bit dejected upon putting in 20 hours into a save before realizing gold does not spawn with RSO installed, and as such I created a small workaround to spawn it in my worlds. This is by no means a proper fix, and really just hijacks another mod to implement the alpha gold as-is (and give me access to processing units in my current world).
I am running the Graphite and Diamonds mod along with this mod, so I simply added gold ore gen to the BZCarbon RSO Config file.
While not required, I would suggest creating a copy of the RSO mod with a separate version (indicated below as 6.2.23xx) as to keep any modifications to RSO isolated to the copy. This requires changing the version number in a few places, ultimately this process is obvious and has been left as an exercise to the reader ;)
For temporary gold spawning, in the "../AppData/Roaming/Factorio/mods/rso-mod_6.2.23xx.zip/resourceconfigs/bzcarbon.lua" file I added the code below the diamond config snippet. It is a carbon copy (pun-intended) of the diamond spawning, and as such should be relatively rare. I know very little about how RSO works, and I have put zero effort into balancing, but this managed to spawn gold into my world and if it ain't broke....
CODE:
config["gold-ore"] = {
type="resource-ore",
allotment=15,
spawns_per_region={min=1, max=1},
richness=14000,
size={min=10, max=15},
min_amount=500,
}
This will work in existing worlds, but may require some exploration into un-generated chunks.
