Develop mining

Develop mining is an upgrade in Cossacks 3, available at the Academy.

Background
In order to intensify ore extraction, new tools and extraction methods were introduced in the 17th and 18th centuries. Miners used tubs and various lifting devices. When it was impossible to extract minerals from an open pit, they built mines. Pumps were used to pump out water. These innovations significantly increased miners' productivity.

Effect

 * Stone excavation efficiency +100%