This is a standalone game in the Carcassonne series.
In Carcassonne: Gold Rush, players return to the 19th century in the United States when cowboys drove cattle, trappers traded with Native Americans, the first railway routes appeared, and explorers — that is, the players — sent their henchmen to gold mines to laboriously search for gold nuggets. But be careful things aren't always as they seem and you may be left just holding fools gold!