The Ring of Fire region in northwestern Ontario hosts many valuable magmatic ore deposits, including six major chromite and one significant Ni-Cu-(PGE) deposit. A 3D geological model was developed to examine the subsurface architecture and structural disposition of the Double Eagle and Black Thor intrusive complexes that host these deposits. The model is constrained by diamond drillhole datasets, regional geological maps and a refined structural interpretation based on high-resolution magnetic data. Employing implicit and explicit modelling methods, a 3D representation of the intrusive complexes was generated by fitting triangulated surfaces to relevant drillhole constraints. Through the examination of the spatial relationships between the main shear zones and the intrusive units of the DEIC and BTIC, the primary and post-ore deformation geometries of the complexes were evaluated, increasing our understanding of the magmatic plumbing system and supporting the interpretation of a single, connected ultramafic complex dissected and transposed by ductile deformation.