Hosted in the Archean greenstone belt，the Nuanquanzi gold deposit is of ductile shear metamorphic hydrothermal origin, with the mineralization controlled by the NW-trending shear belts. Native ruthenium and hedleyite were identified in the pyrite quartz lodes. Ruthenium occurs as tabular or irregular grains or aggregates，mostly less than 10 um in grain size. It usually occurs at the contacts between pyrite and quartz，or less commonly, in cracks of quartz.Structures and textures suggest that the native ruthenium is coeval with the pyrite and quartz. Compared with the native ruthenium from the oxidation zones of ultramafic rocks，the native ruthenium from the Nuanquanzi deposit is more enriched in W, Co and Fe and relatively lower in Ru, with the chemical formula being Ru0.675W0.l25Fe0.095Co0.064. Pt is extremely inhomogeneous in ruthenium. Hedleyite contains considerable amounts of Pt. The coexistence between Ru, Pt and Au throws light on the sources of ore-forming materials.The mafic and ultramafic rocks in the Anshan Group may be the major "gold rcs}rvoir". During the tectono-magmatic remobilization, PGE and gold were transported upwards, resulting in gold mineralization in the upper part of the greenstone belt. Such an inference is consistent with the sulfur isotope data， suggesting that S, Au and PGE are derived from the mantle. The first discovery of platinum group minerals in the deposit supports the suggestion that mafic and ultramafic rocks in greenstone belts seem most likely to be the source bed of gold.