Ore be processed and what ore is of too low a grade to be worth mining. Metal ores are generally oxides, sulfides, silicates, or native metals (such as native copper) that are not commonly concentrated in the Earth's crust, or noble metals (not usually forming compounds) such as gold. The ores must be processed to extract the elements of interest from the waste rock and from the ore minerals. Ore bodies are formed by a variety of geological processes. The process of ore formation is called ore genesis. An ore deposit is an accumulation of ore. This is distinct from a
Ore Mountains 2007 the Ore Mountains and West Saxony is the most important Saxon holiday destination after the cities, and tourism is an important economic factor in the region. Since 2004 the Ore Mountain Tourist Association ("Tourismusverband Erzgebirge") has offered the Ore Mountain Card ("ErzgebirgsCard") with which over 100 museums, castles, heritage railways and other sights may be visited free of charge. The culture of the Ore Mountains was shaped mainly by mining that goes back to the Middle Ages. The old saying, coined here, that "everything comes from the mine" ("Alles kommt vom Bergwerk her!") refers to many areas of life