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, Oregon office moved from the current site of Galena two miles up Elk Creek to their mine. The new post office was named for a body of galena ore in the area, and the town was renamed as well. The mines were worked extensively in the 1860s and were still active in 1940. Galena, Oregon Galena is an unincorporated community in Grant County, Oregon, United States, about from Austin Junction in the Blue Mountains. It is on the Middle Fork John Day River in the Malheur national forest. The former gold mining camp is considered a ghost town. The locale was