Redbelly Mine

Summary
Redbelly Mine is an infested mine containing Ebony Ore Veins, located just north of Riften, in the settlement Shor's Stone. There is no map marker for the mine, but it is right next to Filnjar's (the blacksmith) house.

The mine itself is a long spiral downwards with little treasure.

The locals describe Redbelly Mine as an iron mine with a red mist of unknown origin. If the mine is entered, the mist is noticeable coming from the bottom of the dig.

Hafjorg, Elgrim's wife in Elgrim's Elixirs in Riften, will ask that a Quicksilver Ore sample that some people found in the mine just before the spiders appeared be brought to her.

Trivia

 * Despite Filnjar claiming that nobody had been hurt yet by the recent spider infestation, several corpses can be seen when inside of the mine.
 * Also despite Filnjar's claim of this being an iron mine, only ebony ore veins can be found in it.

Enemies

 * Frostbite Spiders

Notable loot

 * Ebony Ore from three veins.

Quests
One of the miscellaneous tasks in the game is to clear the mine of spiders. This quest is issued by Filnjar who lives in Shor's Stone and can be found at the blacksmith. During this quest, the mine has around five Frostbite Spiders. The amount of gold received is leveled. If you have an Amulet of Mara, it will open up the possibility of marriage with Sylgja after the quest is completed. She also has a miscellaneous task to deliver a note to her father, Verner.

Trivia
The spiders will respawn over time. It's possible that the spiders then kill the miners, because the miners will still enter the mine with the spiders in it. This can result in a bug that can be exploited for infinite gold, as every time the mine is cleared of the respawned spiders the prompt will appear to once again "Return to Filnjar", who will pay the reward again.