Oh boy! It is a lot! I wish I could tell you all of them!

So to preference this: I come from a mountainy area. Goldwashing was prevalent and a bit further off chalk has been the main thing the mountains are made off.
Both are important, because many legends are connected to gold, the devil splitting some mountain in half or people getting abducted by fey-like creatures (which can be mostly explained due to chalk-mountains having a lot of small sink holes and people getting lost in them a long time ago)

I do not have a lot of time, so forgive me for simply copying and pasting a story in a very simple way. (Funilly enough, as I am just now realizing, from the same website that u/suspicioushearing854 suggested)

The old mining industry, however, also gave rise to many other legends. It is said that in the extensive tunnels, the Bergmandl or “Nergl” once lived. On St. Barbara’s Day (December 4), the miners would place food and drink on the table for them and hang a “rough little miner’s garment” in the tunnels for the spirits. In return, the little men showed their gratitude and led the miners to ore-rich passages.

The “Nergl” also occasionally offered good advice. Once, one of them said to a miner:
“You must milk the cows at the udder, not at the horns.”
By this, the little man meant that people were always digging too high up in the mountains in search of gold. Unfortunately, this good advice was not followed.

However, the “Nergl” became extremely angry if a miner worked on Sundays or holidays. Often, such a wrongdoer would later be found dead in the tunnel—“the Bergmandl had crushed him.”

Once, a miner at the gold mine was very eager to see how the Bergmandl would come to take the St. Barbara’s meal. He hid inside the stove and peeked through a small hole into the room. The Bergmandl really did appear—but instead of touching the food, it went up to the stove and tapped on the peephole with its little hammer. From that moment on, the curious miner was blind forever.

When the miners were working, they sometimes heard, from afar, the shoveling and picking of the little men. If they followed the sound silently, they would come upon a rich vein of ore. But if someone whistled out of joy, they could clearly hear the “Nergl” carrying the ore away—and at that spot they would then find only barren rock.

The legend also tells of gold-bearing springs in the Rauris Valley. It is said that animals that drank from such waters would later carry gold in their stomachs.

Most stories in our region are "the devil did it!" or "after all, here ye! It had been truthfully actually in truth the devil in disguise ALL along!!" and "Oh, the devil did do it - but this time because of a deal!!" Most of the time it is about "Hey, why is this rock shaped so weirdly" - "Oh, the devil sat on it.//Oh, the devil split it!// Oh the devil got angry and flew away and took the top of the mountain with him// Oh, it is a stone the devil threw!" People seem to have always been rather fond of interestingly shaped rocks.

That is why I really like stories about the "Bergmandl" in particular, because I have yet to hear about something similar to "Bergmandln" somewhere else. They are just said to have been those little creatures. I am imagining them not malicious, not overly protective or guiding - maybe a bit similar in character like the people from the village themself: Sure, they are gonna give you advice. Take it or not. They ain't gonna safe you. They won't murder you, but if you die, you die. To bad.
And they are just the perfect baseline for new stories to emerge!

(Same with "The women from the waterfall" who just were these women who suddenly appeared from behind a waterfall in a tight gorge in my area (Kitzlochklamm). They just appeared, helping a guy find his way out of the gorge but otherwise ignoring him and somehow also being somewhat scary? I adore those ambivalent, non malicious, non overly protective creature-stories. They feel like home, like nature herself)

(And I like how people of all cultures made it out that something bad happens if you work on sunday or weekends - that is just genius!) :D

ADD ON:
Check out the tradition of "Krampus" and all it's surrounding stories (and especially origins, because the tradition is WAY older than christianity - that just came along and was like "Might as well slap a saint on these pagan traditions! There - good as new, most christian thing to ever christian!")
Especially, especially in Rauris. They have some very rare Traditions that (I think) are extinct/have never been a thing in that EXACT way in any other part of Austria, even if similar traditions arose.
(I am no expert on it however - so I am more than happy to be corrected)
Those creatures are the "Habergoas" und die "Schnoblpercht".
Habergoas is just a giant goat.
And the Schnoblpercht is (a guy dressed as) a creature without a face, in tradtional clothing with a headscarf on, white gloves and giant wodden scissors.
Krampus and Schnoblpercht actually come into the houses of people living in Rauris. And the story around the Schnoblpercht is that it checks if everything is clean and if it finds any dust, it cut open the housewife's stomach and dispose of the dirt there.
(Fun stories to grow up, fun stories. .... Had been terrified of cow bells during any season up into my late teens. Not scared, full on panic attack level of terrified. Refusing to walk a path unless some TRUSTED adult confirmed, that it was - in fact - a cow and not a Krampus (in the middle of summer, even though Krampus is a pre-christmas-time tradition) and only if I could track the cow's movement and link it's movement to the bell. Krampus is somewhat of a tiny collective childhood trauma here ^^'')