Uranium ore-forming systems of the - Geoscience Australia

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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
Uranium ore-forming systems of the Lake Frome regionDrill hole C8, EL 6.Logged by J. Wright, Union Corp (Australia) Pty Ltd, 5 May 1973.Depth (feet)100105110115120125130135140145150155160165170175180185190195200DescriptionGreen clays underlain by blue-grey clays, non-fissile. RBlue-grey clay series with some green clays. RBlue-grey and green clays in layered series. RBlue-green clays and grey clays. RDark green, blue-grey and blue-green clays. RDark green clays with a little reddish limonitic staining. MRed clays, hematitic staining, and green-black clays, brown clays and grey clays. MRed, black, green clays with limonitic staining. Clays are fissile. MBlack clay layering with a little limonitic staining and green clays. MBlack clay layering with a little limonitic staining and green clays. MBlack clays mostly, with a little brown and green clay layering. RDark green and black clays with yellowish red limonitic staining. A small fractionof fine angular sand, fissile clays. MDark green and black fissile clays with some light green clays. RGreen clays and black clays with some limonitic staining. MGrey clay, green clays and black clays in a layered sequence. RGrey clay, green clays and black clays in a layered sequence. RLight and dark green clays with black clay layering. RLight and dark green clays with black clay layering. RKeyGreen and black clay with limonitic staining. MClayGreen and black clay with limonitic staining. MSandFigure 4.1: Drill log of Hole C8 from EL 6 showing variability in the redox characteristics of theNamba Formation between 100 and 200 feet depth. R = reduced, M = mixed (reduced and oxidisedcharacteristics).Page 44 of 151
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