"We believe . . . underlying intrusive body"John Gardiner, President, and CEO of Taranis states "British Columbia's volcanic-hosted porphyry systems have well-documented and distinctive alteration patterns. It is unrealistic to assume that the intrusives that form these types of deposits were exclusively emplaced in volcanic rocks. Elsewhere, geologists are now asking what happens if these intrusives are emplaced in sedimentary rocks? Studies of alkalic porphyry deposits elsewhere in the world (Cadia Hill, Ridgeway) are now providing valuable insight into what the top of a concealed alkalic porphyry deposit looks like, and it does bear a resemblance to what we are seeing at Thor. The tops of alkalic porphyry bodies include epithermal deposits, widescale pyritization, illite-muscovite-carbonate (Au, Zn, Pb), and albite-K-feldspar-illite alteration. We believe that the Thor epithermal deposit which now extends for over 2 km at surface has a reason for being where it is - and that is an underlying intrusive body".
Rock Hounds, I found some info on "Cadia Hill" and the informative hour+ description is amazing: