The Yomotsu Mines are a dungeon located at the Tokuno Islands of Ultima Online, which is in central Homare-Jima and south of Field of Echoes.
The Yomotsu created these mines as their living and they hate anybody who enters these mines or so known, homes. The enemies who lurk there are very strong and the reason you could enter is where you can find the rare fire beetle living upon the mines. The animal can be tamed with Animal Taming upon defeating the beast and it'll be loyal and it has an ability to make smelting meals very easy.