This is "real" history of the CA/NV/UT history......
In the 1800's, the Peralta family build a gold mine. In the 1840's the family was massacred.
Their gold sat in the mine, forgotten.
In the 1870's, a Dutch settler found the mine (or the cache, or whatever), but then he died as well (duh, he got murdered as well).
So..... go to a one of a few mine foremen (Dangerous Dan), give him plenty of money (350,000) and he'll give you a map to a gold mine (at least 3,000), but- BE WARNED.
En route there, you will encounter robbers, bandits, 80's, slavers.........
If you make it there, you WILL face tribals.
If you fight your way through that shit, you will face random attacks by tribals, hunting parties, slavers, 80's, and just about any raider you can name.
For what MIGHT be an empty mine (in which case you can get the money back).
Other loot:
The mine will have some random shit that can't be used, can be sold for a few caps, and is never seen usually- I was thinking (lol!) a GECK or a water chip.
Best of all- NO NEW MAPS. Standard mine maps, just change the random encos ratio and add random attacks!
https://en.wikipedia.org/wiki/Lost_Dutchman%27s_Gold_Mine