This is my favorite circle hands down, I have it currently, just need to switch to blue, no substitutions.
Gold- Sherm- http://www.cybernations.net/nation_drill_d...ation_ID=204443
Aluminum- Sherm
Coal-
Fish- Chancellor Shankle http://www.cybernations.net/nation_drill_d...ation_ID=323994
Iron-
Lead-
Lumber-
Marble-
Oil-
Rubber- Chancellor Shankle http://www.cybernations.net/nation_drill_d...ation_ID=323994
Wheat-
Uranium-