Total mercury (THg) in water column, sediment, and aqriatic biota as well as environmental risks at artisanal Buladu gold mine and vicinity areas of Gorontalo Province, Indonesia were investigated both in ,or*"n and rainy seasons. THg was determined by CV-AAS (Cold Vapor AtomiJ Absorption Spectrophotometer; Spectr. AA6200) after NabHa (Sodium Borohydride) reduction, with detecti,onli mit was of 0.001 pg L-r. This study showedt hat the assessmenot f average balancd of Hg:Au ratio forecasted tlnt approximately 1-3 g of Hg in open bmning process was releasedto uunorph.re to produceI g of gold. Likewise, 15.88g of Hg is lost to produceI g of gold during amalgamation procqss in paftiedar equipment, the tromols. Moreover, the highest levels of THg concentratiot r i* water columrg sediment and shells in uneontaminated track were 4i;;t: shsrrgLgtJ*, 2t5pg kg'dw for Bellamnyaia vanica and 397pg \g"d* for Mya arenaria in summer a"*oo, respectively, whereas in rainy se:Bon the lower THg concentration ;;;;[rg i:1, sa171rgkgldw, i+trrg tg-ta* for Bellamrtyaiav*tica and 180 pg kg'dw for Mya arenaria. respectively.-However, in contaminated trac\ the sigrrificant elevated THg were found ;br,1 ];t;i{ !?izpg k;-iJ;, l455pg kgldw fot Bettamnyaic wanicaa nd l74spg kgrdw for Mva arenaria in summer .*.oo, respectively, whereas in rainy season the highest concentration ;;;5*g L1 u*ut r.gla*, 125bp! tgid* for Bellamnyiiavanica nd I7!5 pg kgrdw for fuIya arenal,a, respecuiv.f. Tho." eievated THgs were consistent and sigrrificantly different betweent hose two-seasonsin term of bioaccumulation level. Environmental risks values were all exceededth e sandard (>1), it was at risks