The　newly　discovered　Shuangjianzishan　giant　Ag-Pb-Zn　deposit　which　located　in　the　Southern　segment　of　the　Great　Xing＇an　Range　(SGXR),　has　controlled　more　than　18　000　t　reserves　of　Ag,　1.9　Mt　reserves　of　Zn,　and　3.3　Mt　reserves　of　Pb.　Previous　research　has　shown　that　Shuangjianzishan　is　a　typical　epithermal　Ag-Pb-Zn　deposit,　however,　mid-　to　high-temperature　Cu-Sn　(-W)　mineralization　are　few　studies.　In　this　paper,　a　detailed　mineralogical　study　reveals　that　a　remarkable　Cu-Sn　(-W)　mineralization　is　observed　both　in　the　upper　tunnel　and　the　deeper　drill　core　samples.　In　the　shallow　ore-bodies,　tin　dominantly　occurs　as　canfieldite　in　Pb-Zn-rich　ores,　minor　as　cassiterite-quartz　veinlets.　In　the　deep　drill　cores,　tin　occurs　as　cassiterite　in　the　Cu-rich　ores　with　the　assemblage　of　quartz-arsenopyrite-chalcopyrite-stannite-(wolframite).　Four　primary　paragenetic　stages　have　been　recognized.　Stage　I:　cassiterite-quartz-arsenopyrite-chalcopyrite,　including　two　sub-stage:　cassiterite-arsenopyrite-pyrrhotite-quartz　(stage　I1)　and　sphalerite-chalcopyrite-galena-pyrite　(stage　I2);　Stage　II:　galena-sphalerite-silver　minerals;　Stage　III:　Quartz-silver　minerals,　and　stage　IV:　pyrite-carbonate.　Electron　probe　micro-analysis　(EPMA)　show　that　the　early　mineralization　(stage　I)　is　characterized　by　Fe-rich　sphalerite,　Co-rich　pyrite,　Se-rich　canfieldite,　and　Se-Bi-rich　galena,　while　the　later　mineralization　(stage　II-IV)　contains　Fe-depleted　sphalerite,　As-rich　pyrite,　and　Sb-bearing　silver　minerals.　Laser-ablation　inductively　coupled　plasma　mass　spectrometry　(LA-ICP-MS)　analysis　show　that　cassiterite　has　high　contents　of　W,　Fe,　Sb,　and　Ti　and　depleted　in　Nb　and　Ta.　Mineral　associations　and　compositions　implies　a　cassiterite-sulfide　type　tin　mineralization　in　the　Shuangjianzishan　Ag-Pb-Zn　deposit.　A　concealed　granite　porphyry　intrusion　was　exposed　in　deep　drill　cores　in　the　northwest　part　of　the　ore-field,　with　zircon　U-Pb　ages　of　(137.8　±　1.1)　Ma　and　(136.8　±　1.0)　Ma　for　fine-　and　coarse-grains　granite,　respectively.　Bulk　analysis　shows　that　concealed　granites　are　characterized　by　a　highly　fractionated,　relatively　reduced,　and　high　K-calc-alkaline　to　alkaline,　which　belongs　to　A-type　granites,　and　the　remnant　of　Sn-bearing　titanite　suggests　that　it　has　the　potential　to　provide　the　source　of　tin.　Zircon　U-Pb　age　(138–130　Ma)　is　well　coupled　with　the　previous　data　(ore-forming　age,　136–129　Ma)　of　Shuangjianzishan,　suggesting　a　close　temporal　and　genetic　relationship　between　tin　mineralization　and　emplacement　of　the　granite.　This　contribution　implies　that　the　Shuangjianzishan　deposit　may　exist　a　middle-　to　high-temperature　Cu-Sn　(-W)　mineralization　center　rather　than　a　simple　low-temperature　hydrothermal　system,　and　shows　there　is　significant　Sn-Cu　mineralization　potential　in　the　peripheral　and　root　zone　of　ore　district.　©　2022　The　Author(s)