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Villagers gather Coin from Mines faster.
—In-game description

Amalgamation is a technology in Age of Empires III that can be researched by European civilizations at the Market and by African civilizations at the Livestock Market once the Commerce Age is reached and Placer Mines is researched. Once researched, Amalgamation allows Settlers, Coureurs des Bois, Settler Wagons, and Villagers to gather coin from mines 20% faster. For African civilizations, Gold Purification is the further upgrade of this technology.

Although useful and cost effective in early games, Amalgamation becomes less reliable as Plantations become available for European civilizations following the Fortress Age.

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