I got this from the Gov of B.C. website

Porphyry Copper Projects

Porphyry copper deposits in the Northwest often contain significant gold or molybdenum. Few deposits contain all three metals in economically significant amounts. Prospects in the Iskut-Stikine district are developed in late Triassic to early Jurrasic igneous rocks within Stikine terrane prior to its accretion to North America. Pre-accretion porphyry prospects are primarily copper-gold projects; molybdenum is significant only at Schaft Creek.