Seabridge Gold

Iskut: GEOLOGY

The geological setting of the Iskut Property is an island-arc, an environment that hosts many of the world’s largest and most profitable mines including Grassberg (Freeport), Oyu Tolgoi (Rio Tinto) and Batu Hiju (Newmont). This environment is well-known to the Seabridge Gold technical team with more than 15 years of experience exploring and understanding the enormous KSM Project which is nearby and in the same geological setting as Iskut.

The Iskut River region is in the Intermontane Belt on the western margin of the Stikinia Terrane. These rocks record the accretion of Mesozoic volcanic arcs onto the Paleozoic North American continental margin. Stikinia, the largest of several fault-bounded, allochthonous terranes within the Intermontane belt, is wedged between the Tertiary intrusions of the Coast belt and continental margin sedimentary prisms of the Foreland (Rocky Mountain) belt. Stikinia rocks are dominated by variably deformed oceanic island arc complexes of the Triassic Stuhini and Jurassic Hazelton groups. Compressional tectonism, spanning Late Jurassic through late Cretaceous time, generated folding and thrusting that dominate the current structural features in the region.

The Triassic Stuhini Group is made-up of marine sedimentary and volcanic rocks deposited in an oceanic arc basin. Rocks from the Stuhini Group are mostly folded marine mudstone, sandstone and andesitic volcanic rocks that display some degree of metamorphism. Stuhini Group rocks are separated by an erosional unconformity from the overlying Jurassic Hazelton Group.