2.   Dubnik opal mines  History  Harlequin  Something special  Video  Resources Content

3.   Mines are located 35 km from Košice between villages Červenica and Zlatá baňa  These opal mines are the oldest and largest opal mines in the world  In the Prešov we have exhibition of opals and they are also inserted into the clock  Slovak precious opal especially liked the family members of the Emperor Napoleon  One more unique Dubnik Opal Mines

5.   The beginnings of mining works can be classified in 11-12 century or in some options of experts back to Roman times  Since the beginning mining until 1922 it was in the area of opal mines punched by hand more than 30 tunnels with a total length of over 22 km  Slovak opal mines until the discovery of opal deposits in Mexico and Australia in the 19th century were dragging a single location in the world History

7.   The largest opal called Harlequin found in 1775 at the bottom of the stream in the village (Červenica).  Its dimensions are honorable Harlequin

9.   Currently, the flooded portion of the mine is Viliam  You can dive here with the experts and look at things which normally human won´t see  Altitude 594 m  Water temperature 5 C all year round  PH of water from 2.8 to 3.0 (acid!)  Visibility theoretical 100 m Something special

11.  Video https://www.youtube.com/watch?v=gFSsnX5wog4

12.   http://www.presov.sk/portal/?c=12&id=3140 http://www.presov.sk/portal/?c=12&id=3140  http://www.opalovebane.sk/index.php?page=20&ja zyk=1 http://www.opalovebane.sk/index.php?page=20&ja zyk=1  http://sk.wikipedia.org/wiki/Op%C3%A1lov%C3% A9_bane_Dubn%C3%ADk http://sk.wikipedia.org/wiki/Op%C3%A1lov%C3% A9_bane_Dubn%C3%ADk  http://www.harry5.estranky.sk/clanky/slovenske- lokality.html http://www.harry5.estranky.sk/clanky/slovenske- lokality.html  https://www.youtube.com/watch?v=gFSsnX5wog4 https://www.youtube.com/watch?v=gFSsnX5wog4 Resources

13.  Thank you for your attention Renáta Gdovinová Simona Tereková II.D