A new promising type of mineral resources, such as complex ores and placers spatially and genetically related to Late Mesozoic ultramafic intrusions, has been identified within the Sikhote-Alin orogenic belt. It is exemplified by the Ariadnoe massif of ultramafic rocks, in the center of which there is a gold–titanium mineralization deposit, and at the exocontact, a gold–antimony mineralization. The main mineralogical and geochemical features of gold–copper formations in its circum-intrusive zone are determined. Special focus is given to the finds of cuproauride, which are uncommon for the study area. To reconstruct the conditions of forming these ores, the isotope composition of sulfur in sulfide minerals is studied. The obtained data indicate the significant metal-bearing potential of the ultramafic rocks in Sikhote-Alin.