Have a look at the solr Stats Component page
http://wiki.apache.org/solr/StatsComponent
There you can see the stat component has a possibility to generate a stat for facet field.
This means you can generate a solr query like
q=*:*&stats=true&stats.field=list_price&stats.field=square_feet&stats.facet=status
This will return the global stat and a stat for each status for the fields list_price and square_feet
The resultset will look like the following:
I am assuming you are using the sunspot stats library https://github.com/giovannelli/sunspot_stats
And there they say that the param after your_field is the facet field
stat(:your_field, :facet => :your_facet_filed, :type => "min")