The Cathedrals Ni-Cu prospect, located at the western margin of the Eastern Goldfields of the Yilgarn Craton, is hosted within a mafic intrusion interpreted as a sill complex. U-Pb dating of apatite from the sill yielded a crystallisation age of 2336 ± 64 Ma, inferring an association of sill emplacement and Ni mineralisation related to emplacement of the c. 2400 Ma Widgiemooltha dike swarm. The sill is typically differentiated into a lower olivine orthocumulate layer overlain by a dolerite unit containing xenoliths of partially assimilated granitoids in its upper portion. The latter is interpreted to be the result of stoping and melting of the granitic hanging wall, thereby creating a gravitationally stable buoyant melt layer beneath the top contact. Ni-Cu-Fe sulfides are increasingly abundant towards the base of the sill, ranging from globular disseminated sulfides to net-textured and massive sulfides at the basal contact. The presence and orientation of sulfide globule-bubble pairs indicates a primary near-horizontal orientation. Massive sulfides commonly exhibit a loop texture with pyrrhotite grains surrounded by pentlandite and chalcopyrite. Despite the variety of sulfide textures, sulfur isotopes have a homogeneous mantle-like signature without significant mass independent fractionation. Mineral chemistries that indicate sulfide prospectivity in larger intrusions do not work as effectively in this small sill, therefore new indicators may need to be developed to explore for similar deposits. To date, there are no other known magmatic deposits of this age in Australia. Sills of this age may be more prospective than previously recognised.

Cathedrals 镍铜矿区位于 Yilgarn 克拉通东部金矿区的西缘，位于被解释为基岩复合体的镁铁质侵入体中。对岩基磷灰石进行 U-Pb 测年，得出结晶年龄为 2336 ± 64 Ma，推断岩基侵位和镍矿化与 c 的侵位有关。 2400 Ma Widgiemooltha 堤坝群。基台通常分化为下部橄榄石正堆积层，其上部覆盖有含有部分同化花岗岩类捕虏体的辉绿岩单元。后者被解释为花岗岩上壁停止和熔化的结果，从而在顶部接触面下方形成了重力稳定的浮力熔化层。 Ni-Cu-Fe 硫化物在基部处越来越丰富，从球状浸染状硫化物到基底接触处的网状结构和块状硫化物。硫化物球-气泡对的存在和方向表明主要的近水平方向。块状硫化物通常呈现环形结构，磁黄铁矿晶粒被镍黄铁矿和黄铜矿包围。尽管硫化物结构多种多样，但硫同位素具有均匀的类地幔特征，没有明显的质量独立分馏。表明较大侵入体中硫化物前景的矿物化学在这个小岩床中并不有效，因此可能需要开发新的指标来勘探类似的矿床。迄今为止，澳大利亚还没有其他已知的这个时代的岩浆矿床。这个时代的基石可能比以前认识到的更有前瞻性。