DocArchive (1981): Digging for Gold

What are the chances of striking gold in your own backyard? What if your discovery turns out to be priceless? In 1979, Michael Webb and his son, also named Michael, unearthed a treasure hoard on an ancient monastic site in Tipperary that included the Derrynaflan Chalice. Who is entitled to this priceless find, the state or the person who found it?