Abstract: Sullivan Pb-Zn-Ag deposit (British Columbia, Canada) is a classic SEDE X-type massive sulfide deposit, which occurs conformably within clastic metased i mentary rocks of the Middle Proterozoic Aldridge Formation. Several typical mine rals from this deposit are studied, including B-rich (tourmaline), Cl-rich (sc apolite and biotite), Ba-rich (feldspar and mica), and Mn-rich (garnet, chlori te, carbonate and ilmenite) minerals. Tourmaline shows a wide variation of chemi cal compositions, from Mg-rich dravite to Fe-rich schorl and Ca-rich uvite. T he δ11B values of the tourmalines are from－11.1 to－2.9‰, which is si milar to the range (－15.4 to－1.7‰) found worldwide in tourmalines from mass ive sulfide deposits and tourmalinites in dominantly clastic metasedimentary ter ranes. Multiple stages of tourmaline formation are distinguished in the Sullivan deposit. Cl-rich scapolites occur in the bedded sulfide ores at Sullivan. The scapolite porphyro blasts are more Ca-rich (EqAn= 40.8～50.9) and Cl-poor (XCl= 0.38～0.54) than　t he fine-grained euhedral scapolite crystals (EqAn= 22.4～35.1 and XCl= 0. 72～0.8 1) in the same sample. Cl-rich biotites are found only in the bedded sulfide or e s with 0.76 to 1.46 wt％ Cl and a limited variation of Mg/(Mg+Fe) ratios (0.34～ 0.37). Other biotites are commonly Cl-poor (<0.2 wt％Cl) and have a wider range of Mg/(Mg+Fe) ratios (0.24～0.69). Ba-rich feldspar and muscovite with BaO up to 6.8 wt％ also occur within the bedded sulfide ores in association with to urmaline, carbonates, and sulfides. Mn-rich garnets (up to 79％ end-member spe ss artine) at Sullivan constitute coticules (spessartine-quartz rocks) and spessar t ine-rich tourmalinites; they also disseminated in sulfide ores and other countr y rocks. Other Mn-rich minerals include chlorite (up to 4.7 wt％ MnO), carbonate s (up to 30 wt％ MnO), and ilmenite (up to 16.7 wt% MnO). It is suggested that th e existences of aforementioned B-, Cl-, Ba-, and Mn-rich minerals at Sulliva n ar e indicative of possible non-marine evaporite involvement in the ore-forming s ys tem and the bedded sulfide ores were likely precipitated in a dense brine pool i n the Proterozoic sea floor at Sullivan.