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