Ore genesis and loses its metal carrying capacity. Ore deposits rarely fit neatly into the categories in which geologists wish to place them. Many may be formed by one or more of the basic genesis processes above, creating ambiguous classifications and much argument and conjecture. Often ore deposits are classified after examples of their type, for instance Broken Hill type lead-zinc-silver deposits or Carlin–type gold deposits. Classification of hydrothermal ore deposits is also achieved by classifying according to the temperature of formation, which roughly also correlates with particular mineralising fluids, mineral associations and structural styles. This scheme, proposed by Waldemar Lindgren (1933)
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