Ore genesis accumulation of hematite gravels called "pisolites" which form channel-iron deposits. These are preferred because they are cheap to mine. Lead-zinc deposits are generally accompanied by silver, hosted within the lead sulfide mineral galena or within the zinc sulfide mineral sphalerite. Lead and zinc deposits are formed by discharge of deep sedimentary brine onto the sea floor (termed "sedimentary exhalative" or SEDEX), or by replacement of limestone, in skarn deposits, some associated with submarine volcanoes (called volcanogenic massive sulfide ore deposits or VMS), or in the aureole of subvolcanic intrusions of granite. The vast majority of SEDEX lead and zinc deposits
Galena, Alaska place along the Tanana and Yukon Rivers. The Galena high school boys' and girls' basketball teams were regional champions from 2004 to 2007. The boys' basketball team won the state championship in 2008. "Frostbite," a character from the G.I. Joe 3.5" action figure toy line, is from Galena. In Metal Gear Solid, the character of Colonel Campbell announces to Solid Snake that two F-16 fighter jets have been dispatched from Galena as part of a diversionary tactic. Galena, Alaska Galena () ("Notaalee Denh" in Koyukon) is a city in the Yukon-Koyukuk Census Area in the U.S. state of Alaska. At