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Certain Mafic and Ultramafic layered intrusions are a variety of sill that often contain important Ore deposits. Precambrian examples include the Bushveld , Insizwa , and the Great Dyke , complexes of southern Africa , the Duluth intrusive complex of the Superior District, and the Stillwater Intrusive of the United States . Phanerozoic examples are usually smaller and include the Rùm Peridotite complex of Scotland and the Skaergaard intrusive of east Greenland . These intrusives often contain concentrations of Gold , Platinum , Chromium , and other rare elements. SEE ALSO |