War Eagle Mountain is located in Owyhee Mountain range which are situated near the east margin of the mid-Miocene Columbia River–Steens flood basalt province and the western margin of the Snake River Plain. The Owyhee Mountains are host to a major mid-Miocene eruptive center, generally composed of mid-Miocene age basalt flows and younger, rhyolitic flows, domes and tuffs, developed on an eroded surface of Late Cretaceous age granitic rocks.
The local geology and ore mineralogy found within the low sulphidation epithermal veins on War Eagle Mountain are similar to the regimes found at DeLamar and Florida Mountain to the west. The key difference is the host rock. Historic mining War Eagle focused on veins hosted within late Cretaceous age granitic rock. Past production on these high-grade vein systems has outlined strike lengths in excess of 1 km and depth extents of up to 750 meters or more.
Drilling by Integra encountered high-grade gold and silver mineralization above the granodiorite, intersecting mineralization quartz-pyrite cemented rhyolite breccias and brecciated volcano-sediments.