Underground Mining

Underground Mining is a tech from the Neolithic Era which allows for construction of mines to extract further ore from mineral deposits. The first mineral able to mined in this method is flint, which, because of its conchoidal fracturing pattern, is useful to Neolithic settlers for toolmaking and weapons manufacturing.

Required for

 * Flint Mine
 * Copper Mine
 * Tin Mine
 * Iron Mine

Predecessor tech(s)

 * Stone Polishing

Successor tech(s)

 * Deep Mining