▁of ▁sun r ise ▁and ▁sun set . ▁As ▁is ▁the ▁case ▁over ▁all ▁of ▁northern ▁Al aska , ▁the ▁aur ora ▁bore alis ▁is ▁often ▁visible ▁on ▁winter ▁night s ▁when ▁solar ▁activity ▁is ▁high . ▁Snow ▁can ▁happen ▁at ▁any ▁time ▁of ▁the ▁year . ▁The ▁coast ▁can ▁be ▁storm y , ▁with ▁wind s ▁of ▁ ▁to ▁. ▁Vis itors ▁must ▁take ▁care ▁against ▁hypoth erm ia ▁in ▁the ▁cool , ▁d amp ▁environment . ▁ ▁M ining ▁The ▁Red ▁Dog ▁mine ▁is ▁the ▁world ' s ▁largest ▁z inc ▁mine . ▁The ▁mine ▁opened ▁in ▁ 1 9 8 9 , ▁located ▁about ▁ ▁n ortheast ▁of ▁the ▁monument , ▁close ▁to ▁No ata k ▁National ▁Pres erve ▁on ▁land ▁owned ▁by ▁the ▁N AN A ▁Regional ▁Corporation , ▁an ▁Al ask an ▁native ▁corpor ation . The ▁mine ▁is ▁operated ▁by ▁Te ck ▁Com in co ▁Al aska . ▁A ▁ha ul ▁road ▁from ▁the ▁mine ▁cross es ▁monument ▁lands ▁to ▁a ▁small ▁port ▁facility ▁on ▁the ▁monument ' s ▁shore ▁a ▁few ▁miles ▁south ▁of ▁the ▁northern ▁boundary , ▁from ▁which ▁the ▁concentr ated ▁lead ▁and ▁z inc ▁pow der ▁is ▁sh ipped ▁during ▁the ▁ 1 0 0 ▁ice - free ▁days ▁of ▁the ▁year . ▁About ▁ ▁of ▁the ▁ ▁road ▁are ▁within ▁the ▁monument . ▁ ▁A ▁ 2 0 0 6 ▁study ▁measured ▁high ▁lead ▁and ▁cad m ium ▁concentr ations ▁in ▁vol es ▁and ▁birds ▁sample d ▁near ▁the ▁road ▁compared ▁to