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 The City of Galena is incorporated as a first-class city, governed by a city council. The city's mayor is Jon Korta. The Louden Tribal Council is elected to represent the local Athabascan Native community. The council's tribal chief is Jenny Pelkola. The City of Galena operated a full-time police department. There is an Alaska State Troopers post in Galena with two troopers and a trooper-pilot. Galena has a volunteer Rescue Squad composed of Alaska Emergency Trauma Technicians (ETT) and Emergency Medical Technicians (EMT), and a volunteer fire department which recently received new advanced firefighting apparatus from the U.S. Air Force