geophysical, structural and mineralogical signatures of ...k2 k3. 20 | • random ams in breccia •...

Geophysical, Structural and Mineralogical Signatures of the Cloncurry Mineral System

CSIRO MINERAL RESOURCES – MULTIPHYSICS TEAM

Jim Austin| 22 May2017

+ Ben Patterson, John Walshe, Renee Birchall, Monica leGras, Richard Lilly, Phil Schmidt, Clive Foss, Dean Hillan and Dave Clark

Petrophysics Overview

MagSus vs Density

• High density, high MagSus, are dominated by coarse MD magnetite, e.g., Osborne, SWAN.

• High density, medium MagSus(e.g., Cormorant, Maronan) may contain magnetite and pyrrhotite.

• High density negligible MagSuscontain hex. pyrrhotite, sphalerite, galena, pyrite and hematite,

2 |

We start with 1 inch cores

Petrophysics Overview

MagSus vs Remanence

3 |

• High MagSus, and low Q ratios are dominated by coarse MD magnetite, e.g., Osborne.

• Low MagSus, and high Q are rich in monoclinic pyrrhotite, e.g., Cormorant, Canteen.

• Deposits with low MagSus, and low Q may contain hexagonal pyrrhotite, pyrite or hematite.

AMS (Anisotropy of Magnetic Susceptibility)

Uncover Cloncurry AMS

• Measureable petrophysical property of rock

• Preferred orientation of crystallographic axes of anisotropic magnetic minerals,

– i.e., the magnetic fabric.

can be used to:• Define strain distribution prior to mineralisation

• K3 is generally the shortening direction

• K1/K2 are perpendicular to shortening, define foliation

4 |

Isotropic (random)

Anisotropic


µCT image of Artemis (ART16C)K1

AMS (Anisotropy of Magnetic Susceptibility)

AMS can provide information about:

• Strain Fabrics• Shearing• Veining (Dilation)• Sedimentary Banding• Magma Flow• Magmatic Settling• So you need to know about the mineralogy and

the texture to use it effectively

Presentation title | Presenter name6 |

N

90

180

270

Geographiccoordinatesystem

Equal-areaprojection

N=12

K1K2K3

Correlating Structure with Fabric & Mineralogy

• The best way is to image the mineralogy of the same sample you’ve measured


TIMA (Tescan Integrated Mineral Analyser )

Cloncurry -> 750 samples from ~15 deposits

8 |

Maronan Pb-Zn Artemis Cu-Zn Canteen Cu-Au Mt Colin Au-Cu

Osborne Cu-Au Starra Cu-Au Monakoff Cu-Au E1 Cu-Au

9 |

Monakoff Cu-Au E1 Cu-Au

Osborne Cu-Au Ernest Henry Cu-Au SWAN Cu-Au

Canteen Cu-Au Starra Cu-Au

Ernest Henry Cu-Au

IOCG & ISCG alteration systems

• hydrothermal mineralization:• Highly variable• 50 Ma Post-peak metamorphism• Synchronous with felsic

magmatism• Structurally controlled• Formed during transition from

convergence to transpression then extension

• Mineralization was associated with a number of different alteration types:

1. Pyrrhotite-Calcite Alteration

2. Pyrrhotite-Albite Alteration

3. magnetite-apatite

4. sodic (±calcic) alteration

5. Potassic Alteration

6. Quartz-Chlorite-Hematite alteration (retrograde)

10 |

Reduced

Oxidised

Redox and Geophysics

11 |

Associated with Cu.

Associated with Pb & Zn

Associated with Apatite Associated with Pyrite

Gawler IOCGs

Redox & Geophysics

12 |

Associated with Cu.

Associated with Pb & Zn

Associated with Apatite Associated with Pyrite

Cloncurry IOCGs

Redox Control on Cu• Elevated Cu occurs either side of

an apparent redox boundary

• transition from magnetite into magnetite-pyrrhotite

• U-rich alteration sits on more oxidized side

13 |


Uranium, assoc with Mt-dominant Sodic Alteration

REDOX BOU

NDARY

Ternary KTU radiometrics


Industry Geos know about this, they just keep it to themselves

- Mat Brown

How can we learn to recognise this better in drill core???

Case Study1. Ernest Henry Cu-Au

(Iron-Oxide Cu-Au deposit)


Sodic Alteration (albite-actinolite magnetite)

• albite-dominated lithologies

• variable amounts of coarse multi-domain magnetite as the phase.

• Associated with moderate to high susceptibilities

17 |

AMS - Hanging wall (Sodic Alteration)


N

90

180

270



N=22

K1K2K3

18 |

• SE- dipping shear zone• South plunging lineation• Indicating South over

north movement

• Shear Fabric is Consistent with the thrust ± jog model (e.g., Valenta, 2000)

Potassic Alteration

• Replacement feldspars (e.g., Albite) by K- Feldspar

• Formation of Iron Sulphidesreduces Susceptibility

19 |

• K-feldspar alteration is often thought to be associated with hematite (based on the reddish color of the K-feldspar).

• However, magnetite is the dominant magnetic phase.

AMS – Breccia Zone (Potassic Alteration)


N

90

180

270



N=13

K1K2K3

20 |

• Random AMS in breccia

• No fabric (Isotropic)

• It has destroyed the structural fabrics present

• Potassic alteration (Breccia) overprinted the sodic-calcic alteration

• Structurally and

• Metasomatically.

Quartz-calcite-chlorite-hematite alteration• Late quartz-calcite-chlorite-pyrite-hematite

alteration is present in a number of deposits • associated with copper and/ or molybdenum

at Ernest Henry, Canteen, Kalman and Merlin • most oxidized style observed in the

Cloncurry district, • as indicated by the presence of pyrite and hematite,

• rather than pyrrhotite and magnetite

• mineralized samples (with such alteration) sit below the Mt- trend on the density/sus plot.

• iron in magnetite is being converted to;• ferromagnesian minerals (e.g., chamosite), • chalcopyrite, pyrite and/or hematite during the

late alteration history.

21 |

AMS – Quartz-Clacite-Chlorite-Hematite

Uncover Cloncurry AMS22 |

• Horizontal lineation

• Consistent with N-S strike-slip movement in a N-S upright fault.

N

90

180

270



N=5

K1K2K3

1.000 1.424 F1.000

1.424L

Geophysical evidence


Magnetics 1st Vertical derivative of RTP

• Vertical derivative of RTP

• This shows 3 parallel magnetic zones coincident with NE-oriented shearzones.

• Bounded on each side by north to NNW oriented faults

• Mineralisation is coincident with the intersection of the N-fault and the NE-fabric

Inverse Bullseye

• Mineralisation increases on alteration gradient, from Sodic to potassic to hydrolytic alteration

• Mineralisation increases as rocks become more weakly magnetic

• Mineralisation related to oxidation here

24 |

Alteration typeChalcopyrite Chamosite Pyrite Albite Microcline Quartz

And-Alb+Potassic+Calcic 0.00 0.82 0.27 7.41 23.54 10.56Magnetite-Apatite* 3.80 1.84 1.09 1.09 1.09 1.09Potassic (Bt) 0.00 0.29 0.07 58.79 2.80 8.48Potassic (Kf) 0.25 2.27 3.38 2.52 45.91 8.22Potassic+ Cal-Qtz-Py 2.00 1.19 4.03 0.96 31.62 15.88Qtz-Cal-Chl-Py±Cpp±Hem 2.88 10.26 13.96 0.16 2.70 33.56Sodic (Ab-Mt-Ti) 0.00 0.31 0.31 54.96 3.73 2.38Sodic + Potassic (Bt) 0.05 1.12 0.27 20.11 20.00 10.03

Sheet1

DensityCorr K (SI)Q - KoenigsbergerErnest HenryDensity (g/cm3)Mag Sus K (SI)Koenigsberger Ratio (Q)Ernest HenryDensity (g/cm3)Mag Sus K (SI)Q RatioRock TypeErnest HenryDensity (g/cm3)Mag Sus K (SI)Koenigsberger Ratio (Q)

EHM001A2.95307666320.56659137690.8131773982EHM0012.96432494460.61704597750.8125669331EHM0452.77908453960.22098369840.5924725823And-Alb+PotassicAnd-Alb+Potassic+Calcic2.850.190.52

B2.942364360.59132632910.643620933EHM0383.17703290360.37059458980.6341791154And-Alb+Potassic+CalcicMagnetite-Apatite*3.801.841.09

C2.99753381050.69322022630.980902468EHM0392.97004487950.25072607810.882542423And-Alb+Potassic+CalcicPotassic (Bt)2.780.130.36

EHM003A2.70326690040.04758063370.4586489662EHM0032.70553653580.05209250550.4324431252EHM0402.84674472570.27720798250.3814436298And-Alb+Potassic+CalcicPotassic (Kf)3.020.520.83

B2.70175183770.04275200680.4034129607EHM0422.85784391430.18827445770.5268962936And-Alb+Potassic+CalcicPotassic+ Cal-Qtz-Py3.100.410.70

C2.71159086950.06594487610.4352674488EHM0432.72283528380.11573727110.4703482391And-Alb+Potassic+CalcicQtz-Cal-Chl-Py±Cpp±Hem3.270.340.47

EHM004A3.20661735240.48080012885.7626778377EHM0043.01034375230.40906245015.9350053744EHM0442.84882775550.15110787110.4346253615And-Alb+Potassic+CalcicSodic (Ab-Mt-Ti)3.140.760.62

B2.90830847780.35516522284.0795591305EHM0462.66972496460.06633248240.2565881248And-Alb+Potassic+CalcicSodic + Potassic (Bt)2.980.523.31

C2.91610542680.39122199867.9627791551EHM0472.77190366370.08486567140.481729532And-Alb+Potassic+Calcic

EHM005A3.58442308271.71044532081.4178599574EHM0053.79942224911.83866999391.0865427735EHM0053.79942224911.83866999391.0865427735Magnetite-Apatite

B3.78643188431.85213887021.1368668062EHM0032.70553653580.05209250550.4324431252Potassic (Bt)

C4.02741178021.95342579080.7049015568EHM0112.77107898220.11336888650.2570310685Potassic (Bt)

EHM006A3.14720053230.9311563450.4258971343EHM0063.13158689450.81976857410.4512841255EHM0142.86463352830.23051128420.3916991081Potassic (Bt)

B3.19432776240.68281913270.2143809235EHM0253.13124855560.59296792590.7738002904Potassic (Kf)

C3.05323238880.84533024450.7135743187EHM0342.91718283750.29648892480.3059791259Potassic (Kf)

EHM007A2.93632727980.54234032320.9599094179EHM0073.16671845340.62638267580.6507771568EHM0353.03922039180.80304508041.57303366Potassic (Kf)

B3.32187754290.58711555610.6407071509EHM0133.12393639790.81474462690.8458743152Potassic (Kf)

C3.24195053750.7496921480.3517149017EHM0162.82063306180.25888583430.8559473431Potassic (Kf)

EHM008A3.54188153391.1631391240.4010874474EHM0083.53269952781.15193249830.3418897299EHM0173.03770990610.46994991660.7351750644Potassic (Kf)

B3.59730852581.27219904040.2695519978EHM0213.09319154580.42356080710.7311770965Potassic (Kf)

C3.45890852361.02045933060.3550297446EHM0192.95019295170.23658230990.5112208413Potassic+ Cal-Qtz-Py

EHM009A2.96412455260.48685039150.3781326564EHM0092.9334632510.484707690.3978228392EHM0203.27821271210.58633557181.7155712937Potassic+ Cal-Qtz-Py

B2.92565189950.52515140360.3485334486EHM0233.22682491660.69481260750.6514131681Potassic+ Cal-Qtz-Py

C2.9106133010.4421212750.4668024125EHM0283.24320934750.34192863830.2600241763Potassic+ Cal-Qtz-Py

EHM010A3.09888071040.79333377670.840532077EHM0103.09509969930.88015455551.0359498519EHM0302.97849352140.461361730.7827666138Potassic+ Cal-Qtz-Py

B3.09041145260.97828572141.4209688231EHM0312.93432633750.10938054960.2710774522Potassic+ Cal-Qtz-Py

C3.09600693490.86884416820.8463486556EHM0183.29837373680.85330260890.4775495169Qtz-Cal-Chl-Py

EHM011A2.7724524080.13431912560.3278759568EHM0112.77107898220.11336888650.2570310685EHM0263.14450676350.33612356110.5397292543Qtz-Cal-Chl-Py

B2.78818431870.09484827730.1786000202EHM0223.32290254980.03813255070.7875180512Qtz-Cal-Chl-Py-Cpp

C2.75260021980.11093925670.2646172284EHM0333.31454612530.11586581440.0612500395Qtz-Cal-Chl-Py-Hem

EHM013A3.19484494220.92672661610.9343169553EHM0133.12393639790.81474462690.8458743152EHM0012.96432494460.61704597750.8125669331Sodic (Ab-Mt-Ti)

B3.0719173470.74263712750.897629529EHM0063.13158689450.81976857410.4512841255Sodic (Ab-Mt-Ti)

C3.10504690440.7748701370.7056764614EHM0073.16671845340.62638267580.6507771568Sodic (Ab-Mt-Ti)

EHM014A2.85048654290.17956354280.3470936872EHM0142.86463352830.23051128420.3916991081EHM0083.53269952781.15193249830.3418897299Sodic (Ab-Mt-Ti)

B2.85605769140.21395589810.3627135216EHM0092.9334632510.484707690.3978228392Sodic (Ab-Mt-Ti)

C2.88735635060.29801441170.4652901154EHM0103.09509969930.88015455551.0359498519Sodic (Ab-Mt-Ti)

EHM015A3.00413079160.54919705455.6384128369EHM0153.02271136530.49082342867.4102533962EHM0043.01034375230.40906245015.9350053744Sodic + Potassic (Bt)

B3.01441383270.46619606966.9874498389EHM0242.99886464120.3913463130.4637973602Sodic + Potassic (Bt)

C3.04958947150.45707716169.6048975129EHM0362.76339526630.23845409341.1696273875Sodic + Potassic (Kf)

EHM016A2.83762068810.29976756420.7154523746EHM0162.82063306180.25888583430.8559473431EHM0373.12276916691.0500758711.591456882Sodic + Potassic (Kf)

B2.8094751210.23651356471.1021426912EHM0153.02271136530.49082342867.4102533962Sodic+Potassic+Calcic

C2.81480337630.2403763740.7502469633

EHM017A3.12185237720.54932153670.9142901698EHM0173.03770990610.46994991660.7351750644

B3.05382957740.54634240970.7708009034

C2.93744776360.31418580360.5204341202

EHM018A3.34789036621.08620521350.6270052267EHM0183.29837373680.85330260890.4775495169

B3.20259399480.82718227540.503923601

C3.34463684940.64652033780.3017197229

EHM019A3.04724715070.35941779480.6220251078EHM0192.95019295170.23658230990.5112208413

B2.93356168970.17680945570.4664367281

C2.86977001480.17351967920.4452006881

EHM020A3.19928265990.54221244121.0739233895EHM0203.27821271210.58633557181.7155712937

B3.19509467940.50560250521.2247742453

C3.44026079690.71119176892.8480162463

EHM021A3.13766962380.40171033750.6802009995EHM0213.09319154580.42356080710.7311770965

B3.05703686140.43297794980.7705882566

C3.08486815230.4359941340.7427420333

EHM022A3.24049289140.09677161090.5138406639EHM0223.32290254980.03813255070.7875180512

B3.43734244850.01096070350.2343666183

C3.29087230960.00666533771.6143468714

EHM023A3.26315029520.75290607470.7144663756EHM0233.22682491660.69481260750.6514131681

B3.1189869350.5579235140.9202839765

C3.29833751950.77360823370.3194891522

EHM024A2.91146636410.30020808530.3441130472EHM0242.99886464120.3913463130.4637973602

B2.97871896380.41146084390.5931743203

C3.10640859560.46237000980.4541047131

EHM025A3.11697470580.62931617310.8752072973EHM0253.13124855560.59296792590.7738002904

B3.05309646730.46329689170.6983974494

C3.22367449350.68629071280.7477961245

EHM026A3.1419404840.31970858390.5500292852EHM0263.14450676350.33612356110.5397292543

B3.1475814030.32764777770.5430871642

C3.14399840330.36101432150.5260713136

EHM028A3.26368904790.36166378050.2755642345EHM0283.24320934750.34192863830.2600241763

B3.23257293670.33784633310.2609921464

C3.23336605780.32627580120.243516148

EHM030A3.02941133040.47945018130.3830297059EHM0302.97849352140.461361730.7827666138

B2.92944408060.4291333141.2315274135

C2.97662515330.47550169470.7337427221

EHM031A2.98549862860.11124400480.3496708653EHM0312.93432633750.10938054960.2710774522

B2.88981124920.10206299780.2543208492

C2.92766913480.11483464610.209240642

EHM033A3.47668747430.15085203450.057182109EHM0333.31454612530.11586581440.0612500395

B3.21731169930.11037945710.0364942412

C3.24963920230.08636595170.0900737684

EHM034A3.01688397640.29383641950.3332583246EHM0342.91718283750.29648892480.3059791259

B2.79455512140.26132263050.2679786746

C2.94010941460.33430772450.3167003783

EHM035A3.14578791071.022926311.6280007339EHM0353.03922039180.80304508041.57303366

B3.09227188030.83526537361.2780909463

C2.87960138440.55094355761.8130092997

EHM036A2.72257486120.17297824530.9197915651EHM0362.76339526630.23845409341.1696273875

B2.78594295090.27346069031.6069110114

C2.78166798690.26892334470.982179586

EHM037A3.14780750131.12430529691.8245379177EHM0373.12276916691.0500758711.591456882

B3.23028085171.23905804981.6233348566

C2.99021914780.78686426631.3264978718

EHM038A3.10601410730.3379648590.5249543644EHM0383.17703290360.37059458980.6341791154

B3.35550214870.43117539620.8434208227

C3.06958245470.34264351420.5341621591

EHM039A3.05851850430.29162692930.904780895EHM0392.97004487950.25072607810.882542423

B2.9230364780.24449216390.8648026788

C2.92857965610.2160591410.8780436952

EHM040A2.82265698840.26867672420.3992612025EHM0402.84674472570.27720798250.3814436298

B2.84598919580.27908275580.3721138904

C2.87158799270.28386446760.3729557966

EHM042A2.82270825970.12848676280.5043372094EHM0422.85784391430.18827445770.5268962936

B2.84089716220.20057734390.6177463923

C2.90992632110.23575926630.4586052793

EHM043A2.77087679190.17071392370.692967913EHM0432.72283528380.11573727110.4703482391

B2.75707717720.14382570020.4838523332

C2.64055188240.03267218930.2342244712

EHM044A2.86931057220.18257566560.4788950628EHM0442.84882775550.15110787110.4346253615

B2.83617355650.10071755810.4153234743

C2.84099913790.17003038970.4096575473

EHM045A2.72308180050.07284569520.3638882105EHM0452.77908453960.22098369840.5924725823

B2.83727915820.31479940280.7042541762

C2.776892660.27530599740.7092753603

EHM046A2.64166946070.06945017990.3196739013EHM0462.66972496460.06633248240.2565881248

B2.70499400380.06162588110.2157952947

C2.66251142930.06792138620.2342951783

EHM047A2.73904304890.07258169530.4739460388EHM0472.77190366370.08486567140.481729532

B2.76825759140.078990350.4757692989

C2.80841035080.10302496890.4954732585

Mag Sus K (SI)

[CELLRANGE][CELLRANGE]

[CELLRANGE][CELLRANGE][CELLRANGE][CELLRANGE][CELLRANGE][CELLRANGE]

2.84933807002124963.79942224906841242.78041634876317013.02330324234799893.10187663112307853.27008229383718073.13731546175350442.98361683839484560.191758900277952621.83866999393260770.131990892096156470.522806159417737890.405066901159674140.335856133768762110.763331995190970170.51595243120105461And-Alb+Potassic+CalcicMagnetite-Apatite*Potassic (Bt)Potassic (Kf)Potassic+ Cal-Qtz-PyQtz-Cal-Chl-Py±Cpp±HemSodic (Ab-Mt-Ti)Sodic + Potassic (Bt)Density (g/cm3)

Magnetic Susceptibility (SI)

Sheet2

Ernest HenryDensity (g/cm3)Mag Sus K (SI)Koenigsberger Ratio (Q)

And-Alb+Potassic+Calcic2.849338070.19175890030.517869478

Magnetite-Apatite*3.79942224911.83866999391.0865427735

Potassic (Bt)2.78041634880.13199089210.3603911006

Potassic (Kf)3.02330324230.52280615940.8315695565

Potassic+ Cal-Qtz-Py3.10187663110.40506690120.6986789242

Qtz-Cal-Chl-Py±Cpp±Hem3.27008229380.33585613380.4665117155

Sodic (Ab-Mt-Ti)3.13731546180.76333199520.6150484394

Sodic + Potassic (Bt)2.98361683840.51595243123.3140280801

assay vs mag

Ernest HenryDensity (g/cm3)Mag Sus K (SI)Q RatioRock TypePrimary phasesChalcopyriteChamositePyriteAlbiteMicroclineQuartzAlteration typeChalcopyriteChamositePyriteAlbiteMicroclineQuartz

EHM0452.77908453960.22098369840.5924725823And-Alb+PotassicEHM0450.010.290.5121.04419.35And-Alb+Potassic+Calcic0.000.820.277.4123.5410.56

EHM0383.17703290360.37059458980.6341791154And-Alb+Potassic+CalcicEHM03801.330.027.3731.5219.35Magnetite-Apatite*3.801.841.091.091.091.09

EHM0392.97004487950.25072607810.882542423And-Alb+Potassic+CalcicEHM03901.030.080.1923.2522.02Potassic (Bt)0.000.290.0758.792.808.48

EHM0402.84674472570.27720798250.3814436298And-Alb+Potassic+CalcicEHM04002.910.037.4225.817.62Potassic (Kf)0.252.273.382.5245.918.22

EHM0422.85784391430.18827445770.5268962936And-Alb+Potassic+CalcicEHM0420.010.930.490.9727.557.41Potassic+ Cal-Qtz-Py2.001.194.030.9631.6215.88

EHM0432.72283528380.11573727110.4703482391And-Alb+Potassic+CalcicEHM04300.280.011.9812.839.18Qtz-Cal-Chl-Py±Cpp±Hem2.8810.2613.960.162.7033.56

EHM0442.84882775550.15110787110.4346253615And-Alb+Potassic+CalcicEHM04400.150.432.2619.875.63Sodic (Ab-Mt-Ti)0.000.310.3154.963.732.38

EHM0462.66972496460.06633248240.2565881248And-Alb+Potassic+CalcicEHM04600.24023.6728.894.47Sodic + Potassic (Bt)0.051.120.2720.1120.0010.03

EHM0472.77190366370.08486567140.481729532And-Alb+Potassic+CalcicEHM04700.210.871.791.170.05

EHM0053.79942224911.83866999391.0865427735Magnetite-ApatiteEHM00500.39017.660.050.23

EHM0032.70553653580.05209250550.4324431252Potassic (Bt)EHM00300.10.0164.640.120.86

EHM0112.77107898220.11336888650.2570310685Potassic (Bt)EHM01100.360.1370.580.70.12

EHM0142.86463352830.23051128420.3916991081Potassic (Bt)EHM0140.010.410.0641.157.594.45

EHM0133.12393639790.81474462690.8458743152Potassic (Kf)EHM01300.80.682.5920.713

EHM0162.82063306180.25888583430.8559473431Potassic (Kf)EHM0160.076.510.796.0849.077.86




EHM0342.91718283750.29648892480.3059791259Potassic (Kf)EHM0340.330.465.28066.476.77

EHM0353.03922039180.80304508041.57303366Potassic (Kf)EHM0350.0932.243.2459.578.53

EHM0192.95019295170.23658230990.5112208413Potassic+ Cal-Qtz-PyEHM0191.242.681.585.4711.3227.87



EHM0283.24320934750.34192863830.2600241763Potassic+ Cal-Qtz-PyEHM0281.651.932.28027.8820.99


EHM0312.93432633750.10938054960.2710774522Potassic+ Cal-Qtz-PyEHM0311.81.331.35051.333.28

EHM0183.29837373680.85330260890.4775495169Qtz-Cal-Chl-PyEHM0180.1613.3422.720.652.8735.41

EHM0263.14450676350.33612356110.5397292543Qtz-Cal-Chl-PyEHM0263.190.533.7605.8348.11

EHM0223.32290254980.03813255070.7875180512Qtz-Cal-Chl-Py-CppEHM0223.2625.428.1102.0920.97

EHM0333.31454612530.11586581440.0612500395Qtz-Cal-Chl-Py-HemEHM0334.91.751.2400.0129.73

EHM0012.96432494460.61704597750.8125669331Sodic (Ab-Mt-Ti)EHM00100.140.3278.090.10.08

EHM0063.13158689450.81976857410.4512841255Sodic (Ab-Mt-Ti)EHM00600.48041.2916.492.3


EHM0083.53269952781.15193249830.3418897299Sodic (Ab-Mt-Ti)EHM00800.34020.150.275.54



EHM0043.01034375230.40906245015.9350053744Sodic + Potassic (Bt)EHM00400.21039.833.60.38

EHM0242.99886464120.3913463130.4637973602Sodic + Potassic (Bt)EHM0240.110.350.9512.312.8620.39

EHM0362.76339526630.23845409341.1696273875Sodic + Potassic (Kf)EHM0360.061.610.0125.9640.3611.86

EHM0373.12276916691.0500758711.591456882Sodic + Potassic (Kf)EHM0370.041.690.347.1843.247.45

EHM0153.02271136530.49082342867.4102533962Sodic+Potassic+CalcicEHM0150.031.760.0715.279.9310.07

Thrust-Jog Model


Structural-Geophysical-Geochemical Model


Marshall shear is cut by breccia/ orepipe where intersected by the drillhole

What else can we do??


1. Mineralogy2. Geochemistry3. Hyperspectral4. Conductivity5. Density6. Mag Sus7. Remanence8. Radiometrics

Standard 1 inch paleomag cylinder

After use samples can be also used for

What WILL we do??


1. Mineralogy2. Geochemistry3. Hyperspectral4. Conductivity5. Density6. Mag Sus7. Remanence8. Radiometrics

Standard 1 inch paleomag cylinder

After use samples can be also used for

Exploration significance

• Understanding Zonation can help us discriminate barren vs mineralised geophysical anomalies

• Understanding Redox can help us use geophysics to better map mineral systems

• Understanding the relationships between different geophysical signatures of alteration assemblages can help us target them indirectly

• All of this can help us recognise “near miss” signatures in core


“In theory there is no difference between theory and practice.

In practice there is.”Yogi Berra

the Facts and the Truth30 |

Geophysical, Structural and Mineralogical Signatures of the Cloncurry Mineral System Petrophysics OverviewPetrophysics OverviewAMS (Anisotropy of Magnetic Susceptibility)AMS (Anisotropy of Magnetic Susceptibility)AMS can provide information about:Correlating Structure with Fabric & MineralogySlide Number 8Slide Number 9IOCG & ISCG alteration systemsRedox and GeophysicsRedox & GeophysicsRedox Control on CuSlide Number 14Ternary KTU radiometricsSlide Number 16Sodic Alteration (albite-actinolite magnetite)�AMS - Hanging wall (Sodic Alteration)Potassic AlterationAMS – Breccia Zone (Potassic Alteration)Quartz-calcite-chlorite-hematite alterationAMS – Quartz-Clacite-Chlorite-HematiteGeophysical evidenceInverse BullseyeThrust-Jog ModelStructural-Geophysical-Geochemical ModelWhat else can we do??What WILL we do??Exploration significanceSlide Number 30

geophysical, structural and mineralogical signatures of ...k2 k3. 20 | • random ams in breccia •...

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