REDBED RELATED GOLD DEPOSIT, LUBIN-SIEROSZOWICE COPPER DISTRICT, SW POLAND

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Underground prospecting within the L ubin- Sieroszowice mining area which took place during last5 years,led to a discovery of a new type of Au,Pt and Pd mineralisation located 0 - 0 .5 m below the copper- silver orebody in the south- western part of the Polish Permian Basin.The gold- bearing zone lies mainly in the Weissliegendessandstone (L ower Permian) , butlocally transgresses the stratigraphic sequence into the overlying kupferschieferand Wer- ra limestone(Zechstein) .Gold deposit lies in a secondary red- coloured variety of the above mentioned sedimentary strata.The oxidation in the underlying sandstone is reflected by red spots and dots containing fine grains of hematite dispersed in a carbonate- clay matrix.The secondary oxidation is peneconcordant in relation to the reducing facies which contains cop- per sulphides and to the Rote Faule,thatis early diagenetic.Between redbeds(gold bearing zone) and black,reduced sediments (Kupferschiefer) ,a transition zone has been recognized. This transition zone is characterized by the low grade of copper mineralisation.Thickness of the gold depositvaries from few centimetresto1.5 metres with an average of about0 .2 5 me- tres.The highestthickness of Au- depositis observed in placeswhere oxide fronttransgress- es the copper- silver deposit.Gold content ranges from 0 .5 up to 10 6 ppm with an average grade of(0 .717- 3.491)× 10 -6depending on the counting block.Gold- bearing horizon is peneconcordantand is characterized by the presence of high fineness native gold,electrum, hematite,and minor pyrite,chalcopyrite,digenite,chalcocite,covellite,rammelsbergite, clausthalite and tetraauricuprid Underground prospecting within the L ubin- Sieroszowice mining area which took place during last 5 years, led to a discovery of a new type of Au, Pt and Pd mineralization located 0-0.5 m below the copper- silver orebody in the south- western part of the Polish Permian Basin. The gold-bearing zone lies mainly in the Weissliegen desssandstone (Lower Permian), butlocally transgresses the stratigraphic sequence into the overlying kupferschiefe and Wer-ra limestone (Zechstein) .Gold deposit lies in a secondary red-colored variety of the above mentioned sedimentary strata. The oxidation in the underlying sandstone is reflected by red spots and dots containing fine grains of hematite dispersed in a carbonate- clay matrix. The secondary oxidation is peneconcordant in relation to the reducing facies which contains cop- per sulphides and to the Rote Faule, that is early diagenetic. Let’s early diagenetic. Tests of gold bearing zone and black, reduced sediments (Kupferschiefer), a transition zone has be en recognized. This transition zone is characterized by the low grade of copper mineralization. Thickness of the gold depositvaries from few centime tresto1.5 meters with an average of about0 .2 5 meteres. highest highestickness of Au- depositis observed in places where oxide front transgress - es the copper-silver deposit. Gold content ranges from 0 .5 up to 10 6 ppm with an average grade of (0 .717- 3.491) × 10 -6depending on the counting block. Gold-bearing horizon is peneconcordantand is characterized by the presence of high fineness native gold, electrum, hematite, and minor pyrite, chalcopyrite, digenite, chalcocite, covellite, rammelsbergite, clausthalite and tetraauricuprid
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