Abstract
At Sams Creek, a gold-bearing, peralkaline granite porphyry dyke, which has a 7 km strike length and is up to 60 m in thickness, intrudes camptonite lamprophyre dykes and lower greenschist facies metapelites and quartzites of the Late Ordovician Wangapeka formation. The lamprophyre dykes occur as thin (< 3 m) slivers along the contacts of the granite dyke. δ18Omagma values (+5 to +8‰, VSMOW) of the A-type granite suggest derivation from a primitive source, with an insignificant mature crustal contribution. Hydrothermal gold–sulphide mineralisation is confined to the granite and adjacent lamprophyre; metapelite country rocks have only weak hydrothermal alteration. Three stages of hydrothermal alteration have been identified in the granite: Stage I alteration (high fO2) consisting of magnetite–siderite±biotite; Stage II consisting of thin quartz–pyrite veinlets; and Stage III (low fO2) consisting of sulphides, quartz and siderite veins, and pervasive silicification. The lamprophyre is altered to an ankerite–chlorite–sericite assemblage. Stage III sulphide veins are composed of arsenopyrite + pyrite ± galena ± sphalerite ± gold ± chalcopyrite ± pyrrhotite ± rutile ± graphite. Three phases of deformation have affected the area, and the mineralised veins and the granite and lamprophyre dykes have been deformed by two phases of folding, the youngest of which is Early Cretaceous. Locally preserved early-formed fluid inclusions are either carbonic, showing two- or three-phases at room temperature (liquid CO2-CH4 + liquid H2O ± CO2 vapour) or two-phase liquid-rich aqueous inclusions, some of which contain clathrates. Salinities of the aqueous inclusions are in the range of 1.4 to 7.6 wt% NaCl equiv. Final homogenisation temperatures (Th) of the carbonic inclusions indicate minimum trapping temperatures of 320 to 355°C, which are not too different from vein formation temperatures of 340–380°C estimated from quartz–albite stable isotope thermometry. δ18O values of Stage II and III vein quartz range from +12 and +17‰ and have a bimodal distribution (+14.5 and +16‰) with Stage II vein quartz accounting for the lower values. Siderite in Stage III veins have δ18O (+12 to +16‰) and δ13C values (−5‰, relative to VPDB), unlike those from Wangapeka Formation metasediments (δ13Cbulk carbon values of −24 to −19‰) and underlying Arthur Marble marine carbonates (δ18O = +25‰ and δ13C = 0‰). Calculated δ18Owater (+8 to +11‰, at 340°C) and \(\delta^{13}{\text{C}}_{{\rm CO}_{2}}\)(−5‰) values from vein quartz and siderite are consistent with a magmatic hydrothermal source, but a metamorphic hydrothermal origin cannot be excluded. δ34S values of sulphides range from +5 to +10‰ (relative to CDT) and also have a bimodal distribution (modes at +6 and +9‰, correlated with Stage II and Stage III mineralisation, respectively). The δ34S values of pyrite from the Arthur Marble marine carbonates (range from +3 to +13‰) and Wangapeka Formation (range from −4 to +9.5‰) indicate that they are potential sources of sulphur for sulphides in the Sams Creek veins. Another possible source of the sulphur is the lithospheric mantle which has positive values up to +14‰. Ages of the granite, lamprophyre, alteration/mineralisation, and deformation in the region are not well constrained, which makes it difficult to identify sources of mineralisation with respect to timing. Our mineralogical and stable isotope data does not exclude a metamorphic source, but we consider that the source of the mineralisation can best be explained by a magmatic hydrothermal source. Assuming that the hydrothermal fluids were sourced from crystallisation of the Sams Creek granite or an underlying magma chamber, then the Sams Creek gold deposit appears to be a hybrid between those described as reduced granite Au–Bi deposits and alkaline intrusive-hosted Au–Mo–Cu deposits.
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Acknowledgements
Oceana Gold Ltd (formerly GRD Macraes) provided access to drill core and information on the Sams Creek prospect. In particular we thank Lachlan Reynolds, Sean Doyle, Austin Osborne and Peter Grieve for their help. We acknowledge the help of Cornel de Ronde who provided the impetus to start our research on Sams Creek, and Andy Tulloch, Ian Graham, Roger Cooper and Richard Jongens for discussions. We thank Phil Warnes, Karyne Rogers, Ray Soong, Neville Orr, Steve Mawdesley, Christine Prior, Julia Vodanovich and John Simes for their technical assistance. The study was funded by the Foundation of Research, Science and Technology CO5XO207. The manuscript has benefited greatly from thorough reviews by Jeremy Richards, Stuart Simmons, and Jeff Mauk, and scientific and editorial comments by Larry Meinert.
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Appendix I
Appendix I
Sample no. | Site | Rock description | NZMG East | NZMG North | RL (m) | Azimuth true N | Dip | EOH (m) |
---|---|---|---|---|---|---|---|---|
Bore hole samples | ||||||||
SC1 3.07 | Sams Creek, Main Zone | Quartz vein in granite | 8973 | 1575 | 562.00 | 121 | −45.0 | 84.10 |
SC1 3.07 | Sams Creek, Main Zone | Quartz vein in granite | 8973 | 1575 | 562.00 | 121 | −45.0 | 84.10 |
SC4 221.3 | Sams Creek, Main Zone | Arsenopyrite-pyrite veinlets in silicified microgranite | 9030 | 1616 | 556.60 | 66 | −45.0 | 19.50 |
SC4 228.25 | Sams Creek, Main Zone | Contact metapelite/carbonate-chlorite altered lamprophyre | 9030 | 1616 | 556.60 | 66 | −45.0 | 19.50 |
SC15 18.1 | Sams Creek, Main Zone | Quartz vein in granite | 8986 | 1593 | 461.42 | 331 | −45.0 | 27.40 |
SC15 21.7 | Sams Creek, Main Zone | Quartz vein in granite | 8986 | 1593 | 461.42 | 331 | −45.0 | 27.40 |
SC16 123.25 | Sams Creek, Main Zone | Sulphide vein in granite | 9008 | 1614 | 245.44 | 331 | −55.0 | 213.75 |
SC16 4.65 | Sams Creek, Main Zone | Sulphide vein in granite | 9012 | 1614 | 245.44 | 331 | −55.0 | 213.75 |
SC16 9.9 | Sams Creek, Main Zone | Quartz-sulfide veins in silicified microgranite | 9012 | 1614 | 245.44 | 331 | −55.0 | 213.75 |
SC16A 15.0 | Sams Creek, Main Zone | Sulphide vein in granite | 9012 | 1614 | 245.44 | 311 | −45.0 | 32.90 |
SC16A 20.9 | Sams Creek, Main Zone | Sulphide vein in granite | 9012 | 1614 | 245.44 | 311 | −45.0 | 32.90 |
SC16A 26.18 | Sams Creek, Main Zone | Sulphide vein in granite | 9012 | 1614 | 245.44 | 311 | −45.0 | 32.90 |
SC17A 10.2 | Sams Creek, Main Zone | Sulphide vein in granite | 9012 | 1614 | 245.44 | 331 | −70.0 | 28.90 |
SC18 13.55 | Sams Creek, Main Zone | Quartz-sulfide veins in silicified microgranite | 9004 | 1605 | 315.00 | 321 | −60.0 | 62.40 |
SC19 226.8 | Sams Creek, Main Zone | Carbonate-quartz vein in granite | 9009 | 1607 | 288.87 | 331 | −45.0 | 230.00 |
SC25 137.75 | Sams Creek, Main Zone | Porphyry granite | 8992 | 1598 | 398.00 | 331 | −47.5 | 250.00 |
SC25 138.0 | Sams Creek, Main Zone | Carbonate-quartz vein in granite | 8992 | 1598 | 398.00 | 331 | −47.5 | 250.00 |
SC25 144.2 | Sams Creek, Main Zone | Carbonate-quartz vein in granite | 8992 | 1598 | 398.00 | 331 | −47.5 | 250.00 |
SC25 147.0 | Sams Creek, Main Zone | Quartz vein in granite | 8992 | 1598 | 398.00 | 331 | −47.5 | 250.00 |
SC25 151.7 | Sams Creek, Main Zone | Carbonate-quartz vein in granite | 8992 | 1598 | 398.00 | 331 | −47.5 | 250.00 |
SC25 159.1 | Sams Creek, Main Zone | Carbonate-sulphide vein in granite | 8992 | 1598 | 398.00 | 331 | −47.5 | 250.00 |
SC25 171.0 | Sams Creek, Main Zone | Carbonate vein in granite | 8992 | 1598 | 398.00 | 331 | −47.5 | 250.00 |
SC25 171.1 | Sams Creek, Main Zone | Quartz vein in granite | 8992 | 1598 | 398.00 | 331 | −47.5 | 250.00 |
SC25 174.8 | Sams Creek, Main Zone | Sulphide vein in granite | 8992 | 1598 | 398.00 | 331 | −47.5 | 250.00 |
SC25 176.0 | Sams Creek, Main Zone | Carbonate vein in granite | 8992 | 1598 | 398.00 | 331 | −47.5 | 250.00 |
SC25 176.4 | Sams Creek, Main Zone | Carbonate vein in granite | 8992 | 1598 | 398.00 | 331 | −47.5 | 250.00 |
SC25 177.65 | Sams Creek, Main Zone | Sulphide vein in granite | 8992 | 1598 | 398.00 | 331 | −47.5 | 250.00 |
SC25 203.1 | Sams Creek, Main Zone | Quartz-sulfide veins in silicified microgranite | 8992 | 1598 | 398.00 | 331 | −47.5 | 250.00 |
SC25 203.5 | Sams Creek, Main Zone | Quartz-sulfide veins in silicified microgranite | 8992 | 1598 | 398.00 | 331 | −47.5 | 250.00 |
SC25 218.5 | Sams Creek, Main Zone | Phyllite | 8992 | 1598 | 398.00 | 331 | −47.5 | 250.00 |
SC26 101.1 | Sams Creek, Main Zone | Sulphide vein in granite | 9008 | 1598 | 231.53 | - | −90.0 | 200.20 |
SC26 121.8 | Sams Creek, Main Zone | Sulphide vein in granite | 9008 | 1614 | 232.53 | - | −90.0 | 200.20 |
SC29 29.8 | Sams Creek, Main Zone | Quartz-sulfide veins in silicified microgranite | 8788 | 1677 | 811.00 | 241 | −45.0 | 121.10 |
SC29 30.7 | Sams Creek, Riordans | Porphyry granite | 8788 | 1677 | 811.00 | 241 | −45.0 | 121.10 |
SC29 41.3 | Sams Creek, Riordans | Quartz-sulfide veins in microgranite | 8788 | 1677 | 811.00 | 241 | −45.0 | 121.10 |
SC29 45.8 | Sams Creek, Riordans | Quartz-sulfide veins in microgranite | 8788 | 1677 | 811.00 | 241 | −45.0 | 121.10 |
SC29 46.1 | Sams Creek, Riordans | Quartz-sulfide veins in microgranite | 8788 | 1677 | 811.00 | 241 | −45.0 | 121.10 |
SC29 56.5 | Sams Creek, Riordans | Quartz-sulfide veins in microgranite | 8788 | 1677 | 811.00 | 241 | −45.0 | 121.10 |
SC29 61.8 | Sams Creek, Riordans | Cataclasite at metasediment/microgranite contact | 8788 | 1677 | 811.00 | 241 | −45.0 | 121.10 |
SC29 118.3 | Sams Creek, Riordans | Quartz vein in metapelite | 8788 | 1677 | 811.00 | 241 | −45.0 | 121.10 |
SC29 120.5 | Sams Creek, Riordans | Quartz-carbonate vein in metapelite | 8788 | 1677 | 811.00 | 241 | −45.0 | 121.10 |
SC29 120.9 | Sams Creek, Riordans | Metapelite | 8788 | 1677 | 811.00 | 241 | −45.0 | 121.10 |
SC32 16.8 | Sams Creek, SE Traverse | Quartz-sulfide veins in microgranite | 8947 | 1529 | 505.00 | 151 | −45.0 | 91.20 |
SC36 10.7 | Sams Creek, Main Zone | Sulphide vein in granite | 9012 | 1614 | 245.44 | 151 | −45.0 | 203.00 |
SC36 26.2 | Sams Creek, Main Zone | Porphyry granite | 9012 | 1614 | 245.44 | 151 | −45.0 | 203.00 |
SC37 94.3 | Sams Creek, Doyles | Quartz-sulfide veins in sericite-altered microgranite | 8893 | 1564 | 740.00 | 151 | −65.0 | 142.80 |
SC37 94.4 | Sams Creek, Doyles | Quartz-sulfide veins in sericite-altered microgranite | 8893 | 1564 | 740.00 | 151 | −65.0 | 142.80 |
SC37 95.5 | Sams Creek, Doyles | Quartz-sulfide veins in sericite-altered microgranite | 8893 | 1564 | 740.00 | 151 | −65.0 | 142.80 |
SC37 88.5 | Sams Creek, Doyles | Microgranite, sericite altered | 8893 | 1564 | 740.00 | 151 | −65.0 | 142.80 |
SC37 102.6 | Sams Creek, Doyles | Porphyry granite | 8893 | 1564 | 740.00 | 151 | −65.0 | 142.80 |
SC37 104.0 | Sams Creek, Doyles | Quartz-sulfide veins in sericite-altered microgranite | 8893 | 1564 | 740.00 | 151 | −65.0 | 142.80 |
SC37 108.6 | Sams Creek, Doyles | Silicified microgranite | 8893 | 1564 | 740.00 | 151 | −65.0 | 142.80 |
SC38 7.3 | Sams Creek, Doyles | Quartz-carbonate-sulfide veins in sericite-altered microgranite | 8880 | 1562 | 735.00 | 201 | −65.0 | 115.20 |
SC38 7.6 | Sams Creek, Doyles | Quartz-sulfide veins in sericite-altered microgranite | 8880 | 1562 | 735.00 | 201 | −65.0 | 115.20 |
SC38 4.6 | Sams Creek, Doyles | Microgranite, sericite altered | 8880 | 1562 | 735.00 | 201 | −65.0 | 115.20 |
SC38 17.5 | Sams Creek, Doyles | Microgranite with disseminated carbonate | 8880 | 1562 | 735.00 | 201 | −65.0 | 115.20 |
SC39 29.6 | Sams Creek, Main Zone | Quartz-sulfide veins in altered microgranite | 8841 | 1608 | 787.00 | 241 | −65.0 | 219.00 |
SC39 31.1 | Sams Creek, Main Zone | Quartz-sulfide veins in altered microgranite | 8841 | 1608 | 787.00 | 241 | −65.0 | 219.00 |
SC39 39.2 | Sams Creek, Western Outcrops | Porphyry granite | 8841 | 1608 | 787.00 | 241 | −65.0 | 219.00 |
SC39 47.0 | Sams Creek, Main Zone | Quartz-sulfide veins in sericite-altered microgranite | 8841 | 1608 | 787.00 | 241 | −65.0 | 219.00 |
SC39 50.3 | Sams Creek, Main Zone | Porphyry granite | 8841 | 1608 | 787.00 | 241 | −65.0 | 219.00 |
SC39 52.5 | Sams Creek, Main Zone | Quartz-sulfide veins in silicified microgranite | 8841 | 1608 | 787.00 | 241 | −65.0 | 219.00 |
SC39 54.7 | Sams Creek, Main Zone | Quartz-carbonate veins in silicified microgranite | 8841 | 1608 | 787.00 | 241 | −65.0 | 219.00 |
SC40 95.9 | Sams Creek, Main Zone | Quartz-chlorite-carbonate vein in metasandstone | 9030 | 1616 | 327.00 | 241 | −65.0 | 195.80 |
SC40 104.0 | Sams Creek, Main Zone | Quartz-carbonate vein in metasandstone | 9030 | 1616 | 327.00 | 241 | −65.0 | 195.80 |
SC40 105.5 | Sams Creek, Main Zone | Quartz vein in metasandstone | 9030 | 1616 | 327.00 | 241 | −65.0 | 195.80 |
SC40 108.9 | Sams Creek, Main Zone | Metasandstone with metapelite beds | 9030 | 1616 | 327.00 | 241 | −65.0 | 195.80 |
SC40 109.3 | Sams Creek, Main Zone | Carbonate-chlorite altered lamprophyre | 9030 | 1616 | 327.00 | 241 | −65.0 | 195.80 |
SC40 109.6 | Sams Creek, Main Zone | Carbonate-chlorite altered lamprophyre | 9030 | 1616 | 327.00 | 241 | −65.0 | 195.80 |
SC40 109.8 | Sams Creek, Main Zone | Carbonate-chlorite altered lamprophyre | 9030 | 1616 | 327.00 | 241 | −65.0 | 195.80 |
SC40 111.2 | Sams Creek, Main Zone | Hornfels/microgranite contact | 9030 | 1616 | 327.00 | 241 | −65.0 | 195.80 |
SC40 113.55 | Sams Creek, Main Zone | Magnetite altered microgranite | 9030 | 1616 | 327.00 | 241 | −65.0 | 195.80 |
SC40 115.45 | Sams Creek, Main Zone | Porphyry granite | 9030 | 1616 | 327.00 | 241 | −65.0 | 195.80 |
SC40 117.0 | Sams Creek, Main Zone | Sulfide veins in silicified microgranite | 9030 | 1616 | 327.00 | 241 | −65.0 | 195.80 |
SC40 121.6 | Sams Creek, Main Zone | Carbonate-quartz vein in granite | 9030 | 1616 | 327.00 | 241 | −65.0 | 195.80 |
SC40 121.7 | Sams Creek, Main Zone | Quartz vein in granite | 9030 | 1616 | 327.00 | 241 | −65.0 | 195.80 |
SC40 122.3 | Sams Creek, Main Zone | Metapelite contact with carbonate altered lamprophyre | 9030 | 1616 | 327.00 | 241 | −65.0 | 195.80 |
SC40 138.2 | Sams Creek, Main Zone | Quartz vein in granite | 9030 | 1616 | 327.00 | 241 | −65.0 | 195.80 |
SC40 139.0 | Sams Creek, Main Zone | Sulfide veins in silicified microgranite | 9030 | 1616 | 327.00 | 241 | −65.0 | 195.80 |
SC40 142.9 | Sams Creek, Main Zone | Porphyry granite | 9030 | 1616 | 327.00 | 241 | −65.0 | 195.80 |
SC40 151.6 | Sams Creek, Main Zone | Porphyry granite | 9030 | 1616 | 327.00 | 241 | −65.0 | 195.80 |
SC40 154.5 | Sams Creek, Main Zone | Carbonate-altered granite | 9030 | 1616 | 327.00 | 241 | −65.0 | 195.80 |
SC40 155.0 | Sams Creek, Main Zone | Carbonate-chlorite altered lamprophyre | 9030 | 1616 | 327.00 | 241 | −65.0 | 195.80 |
SC42 195.5 | Sams Creek, Anvil | Silicified microgranite with sulfide and carbonate blebs | 9051 | 1611 | 220.00 | 310 | −50.0 | 288.00 |
SC42 186.4 | Sams Creek, Anvil | Sulfide veins in silicified microgranite | 9051 | 1611 | 220.00 | 310 | −50.0 | 288.00 |
SC42 199.5 | Sams Creek, Anvil | Quartz veins in magnetite-altered microgranite | 9051 | 1611 | 220.00 | 310 | −50.0 | 288.00 |
SC42 209.9 | Sams Creek, Anvil | Sulfide veins in silicified microgranite | 9051 | 1611 | 220.00 | 310 | −50.0 | 288.00 |
SC42 210.3 | Sams Creek, Anvil | Sulfide veins in silicified microgranite | 9051 | 1611 | 220.00 | 310 | −50.0 | 288.00 |
SC42 216.7 | Sams Creek, Anvil | Quartz veins in magnetite-altered microgranite | 9051 | 1611 | 220.00 | 310 | −50.0 | 288.00 |
SC42 222.6 | Sams Creek, Anvil | Silicified microgranite with sulfide and carbonate blebs | 9051 | 1611 | 220.00 | 310 | −50.0 | 288.00 |
SC42 223.1 | Sams Creek, Anvil | Silicified microgranite with sulfide and carbonate blebs | 9051 | 1611 | 220.00 | 310 | −50.0 | 288.00 |
SC42 229.2 | Sams Creek, Anvil | Silicified microgranite with sulfide and carbonate blebs | 9051 | 1611 | 220.00 | 310 | −50.0 | 288.00 |
SC42 237.7 | Sams Creek, Anvil | Silicified microgranite with sulfide and carbonate blebs | 9051 | 1611 | 220.00 | 310 | −50.0 | 288.00 |
SC42 246.8 | Sams Creek, Anvil | Silicified microgranite with sulfide and carbonate blebs | 9051 | 1611 | 220.00 | 310 | −50.0 | 288.00 |
SC42 251.1 | Sams Creek, Anvil | Silicified microgranite with sulfide and carbonate blebs | 9051 | 1611 | 220.00 | 310 | −50.0 | 288.00 |
SC42 256.4 | Sams Creek, Anvil | Sulfide veins in silicified microgranite | 9051 | 1611 | 220.00 | 310 | −50.0 | 288.00 |
SC42 258.4 | Sams Creek, Anvil | Silicified microgranite with sulfide and carbonate blebs | 9051 | 1611 | 220.00 | 310 | −50.0 | 288.00 |
SC42 285.7 | Sams Creek, Anvil | Carbonate-chlorite-sericite altered lamprophyre | 9051 | 1611 | 220.00 | 310 | −50.0 | 288.00 |
SC43 12.0 | Sams Creek, Main Zone | Pyritic metapelite | 8982 | 1590 | 461.00 | 344 | −57.0 | 129.40 |
SC43 61.5 | Sams Creek, Main Zone | Carbonate veins in silicified microgranite | 8982 | 1590 | 461.00 | 344 | −57.0 | 129.40 |
SC43 46.0 | Sams Creek, Main Zone | Silicified microgranite | 8982 | 1590 | 461.00 | 344 | −57.0 | 129.40 |
SC43 62.1 | Sams Creek, Main Zone | Magnetite altered microgranite | 8982 | 1590 | 461.00 | 344 | −57.0 | 129.40 |
SC43 73.8 | Sams Creek, Main Zone | Quartz-carbonate vein in silicified microgranite | 8982 | 1590 | 461.00 | 344 | −57.0 | 129.40 |
SC43 96.0 | Sams Creek, Main Zone | Carbonate veins in silicified microgranite | 8982 | 1590 | 461.00 | 344 | −57.0 | 129.40 |
SC43 98.6 | Sams Creek, Main Zone | Carbonate-chlorite altered lamprophyre | 8982 | 1590 | 461.00 | 344 | −57.0 | 129.40 |
SC43 113.3 | Sams Creek, Main Zone | Pyritic metapelite | 8982 | 1590 | 461.00 | 344 | −57.0 | 129.40 |
SC43 114.0 | Sams Creek, Main Zone | Pyritic metapelite | 8982 | 1590 | 461.00 | 344 | −57.0 | 129.40 |
SC43 115.9 | Sams Creek, Main Zone | Quartz vein in metapelite | 8982 | 1590 | 461.00 | 344 | −57.0 | 129.40 |
SC43 121.0 | Sams Creek, Main Zone | Pyritic metapelite | 8982 | 1590 | 461.00 | 344 | −57.0 | 129.40 |
SC44 136.5 | Sams Creek, Main Zone | Metapelite with bedded pyrite | 9008 | 1622 | 230.00 | 331 | −73.0 | 329.30 |
SC44 173.3 | Sams Creek, Main Zone | Carbonate-chlorite altered lamprophyre with carbonate veinlets | 9008 | 1622 | 230.00 | 331 | −73.0 | 329.30 |
SC44 174.2 | Sams Creek, Main Zone | Silicified microgranite with sulphide and carbonate veinlets | 9008 | 1622 | 230.00 | 331 | −73.0 | 329.30 |
SC44 179.3 | Sams Creek, Main Zone | Carbonate-chlorite altered lamprophyre | 9008 | 1622 | 230.00 | 331 | −73.0 | 329.30 |
SC44 184.6 | Sams Creek, Main Zone | Silicified microgranite with sulphide and carbonate veinlets | 9008 | 1622 | 230.00 | 331 | −73.0 | 329.30 |
SC44 186.9 | Sams Creek, Main Zone | Silicified microgranite with sulphide and carbonate veinlets | 9008 | 1622 | 230.00 | 331 | −73.0 | 329.30 |
SC44 195.7 | Sams Creek, Main Zone | Silicified microgranite with sulphide and carbonate veinlets | 9008 | 1622 | 230.00 | 331 | −73.0 | 329.30 |
SC44 197.7 | Sams Creek, Main Zone | Sericite-carbonate altered microgranite with quartz and sulphide veinlets | 9008 | 1622 | 230.00 | 331 | −73.0 | 329.30 |
SC44 226.3 | Sams Creek, Main Zone | Arsenopyrite vein in silicified microgranite | 9008 | 1622 | 230.00 | 331 | −73.0 | 329.30 |
SC44 234.0 | Sams Creek, Main Zone | Arsenopyrite-pyrite veinlets in silicified microgranite | 9008 | 1622 | 230.00 | 331 | −73.0 | 329.30 |
SC44 246.8 | Sams Creek, Main Zone | Arsenopyrite vein with fringe of black ?sulphide in silicified microgranite | 9008 | 1622 | 230.00 | 331 | −73.0 | 329.30 |
SC44 251.6 | Sams Creek, Main Zone | Arsenopyrite-pyrite veinlets in silicified microgranite | 9008 | 1622 | 230.00 | 331 | −73.0 | 329.30 |
SC44 276.0 | Sams Creek, Main Zone | Arsenopyrite-pyrite veinlets in silicified microgranite | 9008 | 1622 | 230.00 | 331 | −73.0 | 329.30 |
SC44 276.2 | Sams Creek, Main Zone | carbonate + feldspar vein in silicfied microgranite | 9008 | 1622 | 230.00 | 331 | −73.0 | 329.30 |
SC44 318.2 | Sams Creek, Main Zone | Cemented fault breccia with clasts of lamprophyre and metapelite | 9008 | 1622 | 230.00 | 331 | −73.0 | 329.30 |
SC44 327.0 | Sams Creek, Main Zone | Metapelite with disseminated pyrite | 9008 | 1622 | 230.00 | 331 | −73.0 | 329.30 |
SC45 54.2 | Sams Creek, Main Zone | Metasandstone with carbonate alteration | 9008 | 1622 | 231.00 | 91 | −60.0 | 148.85 |
SC45 63.8 | Sams Creek, Main Zone | Carbonate-chlorite-sericite altered lamprophyre | 9008 | 1622 | 231.00 | 91 | −60.0 | 148.85 |
SC45 65.2 | Sams Creek, Main Zone | Carbonate-chlorite altered lamprophyre | 9008 | 1622 | 231.00 | 91 | −60.0 | 148.85 |
SC45 67.3 | Sams Creek, Main Zone | Carbonate veinlets in silicified microgranite | 9008 | 1622 | 231.00 | 91 | −60.0 | 148.85 |
SC45 69.7 | Sams Creek, Main Zone | Arsenopyrite vein cut by pyrite veinlets in silicified microgranite | 9008 | 1622 | 231.00 | 91 | −60.0 | 148.85 |
SC45 72.6 | Sams Creek, Main Zone | Sericite-quartz alteration replacing magnetite alteration | 9008 | 1622 | 231.00 | 91 | −60.0 | 148.85 |
SC45 92.0 | Sams Creek, Main Zone | Arsenopyrite-pyrite veinlets in silicified microgranite | 9008 | 1622 | 231.00 | 91 | −60.0 | 148.85 |
SC45 93.6 | Sams Creek, Main Zone | Arsenopyrite-pyrite veinlets in silicified microgranite | 9008 | 1622 | 231.00 | 91 | −60.0 | 148.85 |
SC45 112.1 | Sams Creek, Main Zone | Contact carbonate-rich lamprophyre/silicfied granite with pyrite veinlets | 9008 | 1622 | 231.00 | 91 | −60.0 | 148.85 |
SC45 112.2 | Sams Creek, Main Zone | Carbonate-chlorite altered lamprophyre | 9008 | 1622 | 231.00 | 91 | −60.0 | 148.85 |
SC45 112.8 | Sams Creek, Main Zone | Carbonate-chlorite-sericite altered lamprophyre | 9008 | 1622 | 231.00 | 91 | −60.0 | 148.85 |
SC45 115.6 | Sams Creek, Main Zone | Carbonate-rich lamprophyre cutting metapelite | 9008 | 1622 | 231.00 | 91 | −60.0 | 148.85 |
SC45 118.1 | Sams Creek, Main Zone | Breccia with clasts of metapelite, vein quartz and pyrite | 9008 | 1622 | 231.00 | 91 | −60.0 | 148.85 |
SC45 119.0 | Sams Creek, Main Zone | Quartz vein in metapelite | 9008 | 1622 | 231.00 | 91 | −60.0 | 148.85 |
SC48 187.15 | Sams Creek, Main Zone | Quartz vein | 9030 | 1616 | 329.80 | 312 | −75.0 | 248.70 |
SC48 187.2 | Sams Creek, Main Zone | Contact carbonate-rich lamprophyre/silicfied microgranite | 9030 | 1616 | 329.80 | 312 | −75.0 | 248.70 |
SC48 190.2 | Sams Creek, Main Zone | Carbonate vein in silicified microgranite | 9030 | 1616 | 329.80 | 312 | −75.0 | 248.70 |
SC48 190.4 | Sams Creek, Main Zone | Sphalerite in sulphide vein in silicified microgranite | 9030 | 1616 | 329.80 | 312 | −75.0 | 248.70 |
SC48 198.4 | Sams Creek, Main Zone | Arsenopyrite-pyrite veinlets in silicified microgranite | 9030 | 1616 | 329.80 | 312 | −75.0 | 248.70 |
SC48 201.4 | Sams Creek, Main Zone | Silicified microgranite veined with quartz, sulphide and carbonate | 9030 | 1616 | 329.80 | 312 | −75.0 | 248.70 |
SC48 203.4 | Sams Creek, Main Zone | Sericite-rich microgranite veined with quartz, sulphide and carbonate | 9030 | 1616 | 329.80 | 312 | −75.0 | 248.70 |
SC48 206.8 | Sams Creek, Main Zone | Arsenopyrite-pyrite veinlets in silicified microgranite | 9030 | 1616 | 329.80 | 312 | −75.0 | 248.70 |
SC48 207.7 | Sams Creek, Main Zone | Magnetite altered microgranite with quartz veinlets | 9030 | 1616 | 329.80 | 312 | −75.0 | 248.70 |
SC48 221.3 | Sams Creek, Main Zone | Arsenopyrite-pyrite veinlets in silicified microgranite | 9030 | 1616 | 329.80 | 312 | −75.0 | 248.70 |
SC48 222.0 | Sams Creek, Main Zone | Carbonate veinlets in silicified microgranite | 9030 | 1616 | 329.80 | 312 | −75.0 | 248.70 |
SC48 228.3 | Sams Creek, Main Zone | Carbonate-chlorite altered lamprophyre with quartz-carbonate-sulphide veinlets | 9030 | 1616 | 329.80 | 312 | −75.0 | 248.70 |
SC48 228.3 | Sams Creek, Main Zone | Carbonate-chlorite altered lamprophyre with quartz-carbonate-sulphide veinlets | 9030 | 1616 | 329.80 | 312 | −75.0 | 248.70 |
SC48 240.2 | Sams Creek, Main Zone | Metapelite with quartz-pyrite veinlets | 9030 | 1616 | 329.80 | 312 | −75.0 | 248.70 |
Outcop Samples | ||||||||
P68911 | Sams Creek, Main Zone | Silicified microgranite | 8980 | 1580 | ||||
P68912 | Sams Creek, Anvil | Porphyry granite | 9120 | 1620 | ||||
P68913 | Sams Creek, Barrons Flat | Porphyry granite | 9260 | 1660 | ||||
P68914 | Sams Creek, Barrons Flat | Porphyry granite | 9210 | 1610 | ||||
P68915 | Cobb Dam Road | Devil River Group; greenschist, sulfide-rich | 8770 | 1350 | ||||
CN 1078 | Arthur Marble | Metamorphosed marine carbonate with trace pyrite | Locality indicated on Fig. 1 | |||||
CN 1079 | Arthur Marble | Metamorphosed marine carbonate with trace pyrite | Locality indicated on Fig. 1 | |||||
CN 632 | Arthur Marble | Metamorphosed marine carbonate with trace pyrite | Locality indicated on Fig. 1 | |||||
CN 652 | Arthur Marble | Metamorphosed marine carbonate with trace pyrite | Locality indicated on Figure 1 |
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Faure, K., Brathwaite, R.L. Mineralogical and stable isotope studies of gold–arsenic mineralisation in the Sams Creek peralkaline porphyritic granite, South Island, New Zealand. Miner Deposita 40, 802–827 (2006). https://doi.org/10.1007/s00126-005-0013-y
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DOI: https://doi.org/10.1007/s00126-005-0013-y