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 in the few last remaining dry parts of town. The flood dike the Air Force built around the runway managed to keep the river from inundating the runway and GILA. Efforts are currently underway to help Galena rebuild, with the assistance of the Federal Emergency Management Agency and volunteer groups. Galena is located at (64.740643, -156.885462). Galena is located on the north bank of the Yukon River, east of Nulato. The Innoko National Wildlife Refuge is southwest of Galena. According to the United States Census Bureau, the city has a total area of , of which, of it is land