How to Collect Precious Metals
Precious metals are: Upgraded [Mason center EX] and [Clay miner center EX] are obtained with low probability when collecting stones and clay.
If the culture level is 3, then: You should be able to <Grade Up> [Mason center] and [Clay miner center].
Build Mason center and Clay miner center where there are stones and sand. After construction is complete, right-click on those buildings and you should see the <Grade Up> menu.
The upgraded [Mason center EX] and [Clay miner center EX] collect precious metals with low probability at the time of collection.
Collected precious metals can be used by storing them in precious metal storage.
