According to the map I just looked up, Eden Valley is Southeast of Powers. I found a map that shows 3 mines in that area and 3 more just west of there. I figure if you can find out the name of the mine it will be easier to research. You have to zoom in close to the Coos Bay area on the map, then arrow down until you get south of Powers in order to see the mines. Zoom in more then click on the indicator to find the name of the mine. Also under the map to the right you can click on the county and it has the mines listed in that area. Hope this helps. If not, it's a good site to know about anyway. Good luck!