When the Dark Elves freed their Argonian slaves, some of the Lizard-Folk assumed control of the Dunmeri ventures where they had been laboring in bondage. Not all these ventures have been successful.
Onkobra Kwama Mines are located in central Shadowfen. Nearest wayshrine is Percolating Mire which is a short distance to the east. It is a small circular delve. Overall, a decent place to farm provisioning mats and scrib jelly.