The Islands lie between the North Solomon Plate and the San Cristobal Trench. The Islands form part of the circumpacific "Ring of Fire" containing active volcanoes and are located within an active subduction zone. Rocks on the Islands range from ultramafic to diorite intrusives, felsic to mafic, and marine sedimentary rocks to fluvial sediments.
Four deposits known as the Valehaichichi, Kupers, Namachamata and Dawsons deposits, lie within a diamond shaped hydrothermally altered zone 2.5 km long by l.4 km wide trending north-northeast.
