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)
Mineral industry of Paraguay shown interest in the country, which could support continued economic growth and foreign direct investment (FDI) in new technologies well into the next decade. In 2006, Paraguay produced mostly cement, clays, iron ore, natural gas, pig iron, and steel. Paraguay's mineral reserves and resources were unidentified. The mineral industry of Paraguay mostly consists of Paraguayan state-owned firms. The structure of the country's mineral industry would, however, change, particularly in the natural gas sector, to a privately and/or joint-venture owned, government-regulated regime from one that was only government owned (Banco Central del Paraguay, 2007). FDI inflows to Mercosur increased to $25.1