The deposits exhibit strong structural controls, being emplaced along faults and contacts synchronous with intense hydrothermal alteration and brecciation. The associated mineralogy consists of hematite (variety of forms), specularite, magnetite, bornite, chalcopyrite, chalcocite, pyrite; digenite, covellite, native copper, carrolite, cobaltite, Cu-Ni-Co arsenates, pitchblende, coffinite, brannerite, bastnaesite, monazite, xenotime, florencite, native silver and gold, and silver tellurides. Lefebure (1995) notes “Cu-U-Au mineralization is typically hosted in the Fe oxide matrix as disseminations with associated micro veinlets and sometimes rare, mineralized clasts. Textures indicating replacement and microcavity filling are common. Intergrowths between minerals are common. Hematite and magnetite may display well developed crystal forms, such as interlocking mosaic, tabular or bladed textures. Breccias may be subtle in hand sample as the same Fe oxide phase may comprise both the fragments and matrix. Breccia fragments are generally angular and have been reported to range up to more than 10 m in size, although they are frequently measured in centimetres. Contacts with host rocks are frequently gradational over the scale of centimetres to metres. Hematite breccias may display a diffuse wavy to streaky layered texture of red and black hematite.” The age of mineralization varies from Proterozoic to Tertiary.