Stone

A common stone. It is usually obtained as a side-drop of most mining activities. Other than events there is no way to obtain it consistently.

Mining

 * Mine iron (level 1)
 * Mine coal (level 3)
 * Extract aluminum (level 7)
 * Mine sulfur (level 10)
 * Mine niter (level 13)
 * Mine zinc (level 15)
 * Mine copper (level 18)
 * Mine lead (level 20)
 * Extract chromium (level 25)
 * Dig clay (level 30)
 * Mine gold (level 35)
 * Extract magnesium (level 38)
 * Mine quartz (level 45)
 * Mine raw titanium (level 50)
 * Extract nickel (level 58)
 * Mine limestone (level 60)
 * Mine tungsten (level 65)
 * Mine borax (level 80)
 * Mine germanium (level 90)
 * Mine fluorite (level 100)
 * Mine cobalt (level 105)

Crafting

 * Crude projectile (level 11)
 * Cement (level 55)

Player houses
Some houses require this resource in varying amounts depending on house type and size/level.