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

Refineries is a technology in Age of Empires III that can be researched by European civilizations at the Plantation once the Industrial Age is reached and Homesteading is researched. Once researched, it allows Settlers, Coureurs des Bois, and Settler Wagons to gather coin from Plantations and Rice Paddies 30% faster.

Although Refineries is the most expensive technology in the Plantation, costing 600 food and 600 wood, it benefits the civilization's economy in the long run.

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