Uranium ore-forming systems of the - Geoscience Australia

Uranium ore-forming systems of the Lake Frome regionTable 4.1: List of redox filter wordsOxidised WordsRedPinkMaroonOrangeYellowSaffronPurpleOchreMustardMottledFerruginousFerricLateriteLateriticLimoniteHematiteGoethiteMartiteMaghemiteSpeculariteManganeseMnIronFeFeOFe 2 O 3OxideFeOxGypsumBlownDuneDuricrustFerricreteReduced WordsGreenBlueBlackOliveKhakiDark GreyFreshGleyPyriteMundicChalcopyriteChalcociteMarcasiteGalenaSphaleritePyrrhotiteMagnetiteSulfur, SulphurSulfides, SulphidesGlauconiteChloriteBiotiteGarnetOlivinePeridotiteActinolitePyroxeneAmphiboleHornblendeLigniteCoalOrganicCarbonaceousGraphiteBitumenCreosotePetrolKeroseneHydrocarbonsH 2 SOdourA third issue was the use of the term “as above” or similar. This was addressed by flagging allinstances of the words “as above”, “a. a”, “a.a”, “ditto”, “a/a” and “as for”, and where the entryhad its own flag from the filter list, we assigned the same flag.After the filtering process, a value was assigned to each drill log entry. Where only oxidisedwords had been flagged, the value given was “1”. Where only reduced words had been flagged,the value was “-1”. If both oxidised and reduced words were detected, then the value assignedwas “0”. If the filtering process did not flag the entry, then “-99999” was assigned. Thus, eachinterval for each drillhole in the dataset was assigned a numeric value and these values, along withlocation coordinates, depths and hole angles were entered into the gOcad modelling program.Figure 4.1 shows an example of a drill hole log with changes in redox characteristics over narrowintervals within the Namba Formation.Page 43 of 151