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I played and beat the first two scenarios (The End of a Long Trip and One Lone Settlement) however the third one (The Search for Ore Deposits) did not become available. I'm not sure why this is or what I should do. Any advice would be appreciated.
Just started campaign. Dont know how to unlock or investigate "?" thats spinning above an ore deposit. Tried building mine right there and in several locations, won't let me. HELP!