The Theta Potato Mine is one of the mines which can be found in the Elder Vein Mines.
If you collect the lug nuts and gears on the ground you get 20 coins each.
There is a hidden Double Snake in a big rock here. To get it, first you must have a completed Corrupt Crystal Dampener in your backpack and a Ghost Ray. Then, shown in the image to the right, you use the ghost ray two times because there are two rocks it is hidden behind.