<?xml version="1.0"?>
<resource name="stone" limited="yes" material="rm_stone">
  <item weight="6000" score="10" big="yes">
    <construction skill="quarrying" minskill="1" reqsize="1"/>
  </item>
  <resourcelimit>
    <modifier building="quarry" type="skill" value="1"/>
    <modifier building="quarry" type="material" value="0.5"/>
    <modifier race="troll" type="material" value="0.75"/>
  </resourcelimit>
</resource>