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在伊斯特拉地区的厚层(3000m)白垩纪碳酸盐岩石中发育有早老第三纪铝土矿,含铝土矿岩石出露带沿白垩纪一老第三纪盆地北缘呈北西向延伸60km以上,带宽4—6kin,各单独矿体长可达100—300m,埋深8—20m,偶尔达45m。铝土矿充填在白垩纪页岩溶洞中,并被始新世页岩覆盖。含矿层剖面自下而上可划分为:黄、红、又是黄的铝土矿。其成分为(%);
Early tertiary Oligocene bauxite was developed in the thick (3000 m) Cretaceous carbonate rocks of the Istria region. The outcrops of rocks containing bauxite were northwestern along the northern margin of the Cretaceous-Oligocene Tertiary basin To extend more than 60km, bandwidth 4-6kin, the individual ore body length up to 100-300m, depth 8-20m, and occasionally up to 45m. Bauxite fills the Cretaceous shale caves and is covered by Eocene shales. The profile of the ore-bearing layer can be divided into yellow, red and yellow bauxite from bottom to top. Its composition is (%);