Active and ongoing gold exploration and mining in ... - IAGS 2011

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26 The mineralisation typically occurs in a transitional formation between two thick (several 100 metres) mafic lava sequences (Figs. 9 and 10). The N- to NNE-trending host structure (KiSZ) for the deposit coincides with this contact between western and eastern lava packages. In the area of the ‘Main’ ore zone, host rocks change from mafic pillow and massive lavas west of the mineralised zones to mafic transitional to intermediate lavas (andesite flows of Powell 2001) and minor pyroclastic material within mineralised zones. Graphitic sedimentary intercalations containing chert, argillitic material and BIF occur within the mafic volcanic sequence at the eastern margin of mineralised zones, followed further east by mafic lava packages and ultramafic volcanic rocks. The extent of intermediate and felsic rock compositions in the deposit is presently under investigation. The variation in appearance (and hence the logging and mapping terminology for rock compositions used here) may also alternatively result from progressive alteration of mafic rocks. Most ore is hosted by mafic rocks and those mapped as intermediate or felsic volcanic rocks. Metasedimentary units including BIF typically have low to no gold grade, and the ultramafic rocks are unmineralised. Fig. 9. Total magnetic field (left) and electromagnetic (slingram out-of-phase, right) images for the southern part of the Suurikuusikko area, in 200 m grid. The blue colour represents magnetic lows and conductivity highs in figures on left and right, respectively. Names refer to individual ore zones.
Fig. 10. Pit map from Suurikuusikko showing the main rock types and structures, in 10 m grid (after Patison et al. 2006b). The grade estimates shown are visual estimates based on arsenopyrite abundance. Exposure of the deposit prior to 2007 was limited mainly to the two pits shown in this figure. 27
Page 1: FIELD EXCURSION Active and ongoing
Page 4 and 5: Eilu, P. & Nykänen, V. 2011. Activ
Page 6 and 7: Excursion program and route Introdu
Page 8 and 9: 8 Introduction Pär Weihed, Olof Ma
Page 10 and 11: 10 Svecofennian subduction-generate
Page 12 and 13: 12 Fig. 3. Stratigraphy of the Cent
Page 14 and 15: 14 Svecofennian orogeny. Mafic dyke
Page 16 and 17: 16 Deformation and metamorphism The
Page 18 and 19: 18 cal orogenic gold” below, foll
Page 20 and 21: 20 reported a Sm-Nd age of 2085±85
Page 22 and 23: 22 The least altered amphibole-chlo
Page 24 and 25: 24 Exploration The first indication
Page 28 and 29: 28 Orogenic events relating to CLGB
Page 30 and 31: 30 Alteration in and around the dep
Page 32 and 33: 32 Hanhimaa gold project Matti Tali
Page 34 and 35: 34 Exploration Extensive regional g
Page 36 and 37: 36 Rompas Au-U prospect Michael Hud
Page 38 and 39: 38 Fig. 21. Low-altitude airborne m
Page 40 and 41: 40 Fig. 23. South Rompas region wit
Page 42 and 43: 42 References Agnico-Eagle 2007. Me
Page 44 and 45: 44 Kämäräinen, P. 2011. Kittilä
Page 46 and 47: 46 Rastas, P., Huhma, H., Hanski, E
Page 52: ISBN 978-952-9618-80-4 (Printed) IS

Active and ongoing gold exploration and mining in ... - IAGS 2011

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