bane 1 [vynechat] baníctvo 1 [vynechat] dejiny 1 [vynechat] deposits of raw materials 1 [vynechat] drahé kamene 1 [vynechat] geography 1 [vynechat] history 1 [vynechat] ložiská nerastných surovin 1 [vynechat] mines 1 [vynechat] mining 1 [vynechat] opals 1 [vynechat] opály 1 [vynechat] precious stones 1 [vynechat] vlastiveda 1 [vynechat]