The Rioanda 27-29 occurrence is located on a hill between George Creek and the Loughborough Inlet, approximately 1.2 kilometres south-southwest of George Lake.
The area is underlain by a persistent band, greater than 12 kilometres long, of stratified metavolcanic and metasedimentary rocks of the Upper Triassic Quatsino and Karmutsen formations (Vancouver Group). The band trends north- west and separates Jurassic to Cretaceous Coast Plutonic Complex rock of two different compositions, diorite and granodiorite.
Locally, fine to coarse-grained molybdenite-chalcopyrite mineralization is exposed in borrow pits near a granodiorite contact with limestone and argillite. No rock sample assays were reported.
The area was originally prospected and staked in 1964 as the Rioanda claims. Over the next two years, minor programs of prospecting, geological mapping, geochemical sampling and a preliminary magnetometer survey were completed.
