Nephritic jade deposits have been found along faulted contacts between serpentinite and siliceous units at the King Arctic mine in southeastern Yukon. In the St. Cyr klippe near Quiet Lake south-central Yukon, serpentinite units of the Slide Mountain oceanic assemblage are thrust above phyllite units of the Cassiar terrane. This contact has the potential to contain jade deposits similar to the ones found at the King Arctic mine. However, bedrock mapping during the summer of 2013 failed to identify large jade deposits within the field area, but smaller jade deposits may have been overlooked. The absence of jade mineralization could be due to the lack of fluid migration through faults, but is more likely due to the low silica content of the phyllite.
