<?xml version="1.0"?>
<resource name="iron" limited="yes" material="rm_iron">
  <item weight="500" score="10">
    <construction skill="mining" minskill="1" reqsize="1"/>
  </item>
  <resourcelimit>
    <modifier building="mine" type="skill" value="1"/>
    <modifier building="mine" type="material" value="0.5"/>
    <modifier race="dwarf" type="material" value="0.60"/>
    <guard flag="mining"/>
  </resourcelimit>
</resource>