Central Europe minerals and mining tenders

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In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid chemical compound with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form. Minerals are classified by key chemical constituents; the two dominant systems are the Dana classification and the Strunz classification. Silicate minerals comprise approximately 90% of the Earth's crust. Other important mineral groups include the native elements, sulfides, oxides, halides, carbonates, sulfates, and phosphates. Ores recovered by mining include metals, coal, oil shale, gemstones, limestone, chalk, dimension stone, rock salt, potash, gravel, and clay. Mining is required to obtain most materials that cannot be grown through agricultural processes, or feasibly created artificially in a laboratory or factory.

There is no general agreement either on what geographic area constitutes Central Europe, nor on how to further subdivide it geographically. At times, the term "Central Europe" denotes a geographic definition as the Danube region in the heart of the continent, including the language and culture areas which are today included in the states of Croatia, the Czech Republic, Hungary, Poland, Romania, Serbia, Slovakia, Slovenia and usually also Austria and Germany, but never Russia and other countries of the former Soviet Union towards the Ural mountains. Depending on context, Central European countries are sometimes grouped as Eastern or Western European countries, collectively or individually but some place them in Eastern Europe instead for instance Austria can be referred to as Central European, as well as Eastern European or Western European and Slovenia can sometimes be placed in either Southeastern or Eastern Europe. The 15 countries comprising this subregion are Austria, Belgium, the Czech Republic, Denmark, France, Germany, Hungary, Ireland, Liechtenstein, Luxembourg, the Netherlands, Poland, Slovakia, Switzerland and the United Kingdom.