Opal Mines Dubnk Kristna Jenov 2 D Opal

Opal Mines Dubník Kristína Jenčová 2. D

Opal mines northern part of Slánske vrchy, near the village of Červenica, under the Dubník hill the oldest and the biggest opal mines in the world Australia, Mexico

Characteristic of opals amorphous crystalline substance formed of sillicon dioxide (Si. O 2) and variable quantity of water filling cracks in andesite up to 60 color shades

Characteristic of opals among the most rare and valued – noble opalescence – unique color play milk opal, opal glass

History of mines only place in the world, where the opals were mined by mining methods such a long time ago and in such a large amount well known from the 16 th century probably from the age of Roman Empire before Australia and Mexico, the only opal mining place in the world 150 years ago, around 25 000 carats of opal were mined there in one year

History of mines favour in Napoleon‘s family empress Josephine – Trojan fire the biggest in the world – Harlekyn 1775, 317 000 euros, 594 g, Vienna 1922 - post-war crisis and bad economical situation – mining stopped 1964 – protected area of wintering bats (4000 bats, 16 species)

Mines today

Mines today completely 22 km of passages route – 1280 metres diving in a mines

Mines today

Sources http: //slovakia. travel/opalove-bane-dubnik http: //www. opalyslovenska. eu/sk/bane/opal-a-opalove-bane/ https: //www. zlavadna. sk/zlava_149783_vstup-do-opalovych-bani-libanka https: //sk. wikipedia. org/wiki/Dubn%C 3%ADcke_bane http: //www. zlatabana. sk/index. php/aktuality/56 -opalove-bane https: //www. po-kraj. sk/sk/kraj-ponuka/priroda/podzemny-svet/slovenskeopalove-bane/ https: //www. youtube. com/watch? v=lk 5 g. B_j 5 KYA

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