Gold Purification
Gold Purification is an Industrial Age African upgrade that increases Villager gathering from Mines by 30%. Its benefit is limited to mine gathering, rather than all Coin income.

Research profile
- Age & building
- Industrial Age · Livestock Market
- Prerequisite
- Amalgamation
- Effect
- +30% Villager gathering from Mines
Research effect
Research it at a Livestock Market after Amalgamation. It costs 300 Food and 300 Wood and takes 30 seconds. The bonus applies to Villagers mining; Coin from Fields, Estates, Haciendas, Whales and other sources is unaffected.
Research condition
Africans · Industrial Age · Livestock Market · requires Amalgamation · 300 Food · 300 Wood · 30 seconds · +30% Villager mine gathering.
Cost and prerequisites
Invest when a substantial workforce can keep mining safely after the research completes. The cost and Industrial Age prerequisite make this a late specialization, so compare the likely remaining mine supply with immediate military and economy needs. Protect the mining line to keep the bonus productive.