3D joint inversion of Gradient and Mise-à-la-Masse borehole IP/Resistivity data and its application to magmatic sulfide mineral deposit exploration

• Autorzy: Wondimu H. D. , Mammo T. , Webster B.

Identyfikatory

DOI

10.1007/s11600-018-0199-x

• Języki publikacji: EN

Abstrakty

EN

Gradient and Mise-à-la-Masse IP/Resistivity surveys were conducted on a group of 19 boreholes in Eagle’s Nest, Eagle One magmatic sulfide deposit in northern Ontario, Canada. The surveys were conducted as a follow-up to the many drilled boreholes, some of which missed the target. The surveys were intended to map the distribution of the ore mineralization, outline the deposit hosted by mafic and ultramafic rocks and then guide the drilling of new boreholes. Joint Gradient and Mise-à-la-Masse data inversion produced 3D chargeability and conductivity models. The inverted 3D models in turn help delineate the outline of the mineralized zone, and determine the shape, size, strength and economic viability of the deposit. The Gradient array determined the direction of the mineralization with respect to the boreholes, and the Mise-à-la-Masse array examined the highly conductive subsurface bodies and their surroundings. The mapped ore zone shows close similarity to the 0.5 Cu% and 1.05 Ni% iso-surfaces that are produced from core assay result confirming the reliability of the results obtained in this study.

Słowa kluczowe

EN

gradient; chargeability; inversion; conductivity; Mise-à-la-Masse; Borehole Ip/Resistivity

PL

gradient; podatność; odwrócenie; przewodność

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2018
• Tom: Vol. 66, no. 5
• Strony: 1031--1045
• Opis fizyczny: Bibliogr. 20 poz.

Twórcy

autor

Wondimu H. D.

• School of Earth SciencesAddis Ababa University Addis Ababa Ethiopia
• Brampton Canada

autor

Mammo T.

• School of Earth SciencesAddis Ababa University Addis Ababa Ethiopia

autor

Webster B.

• Thornhill Canada

Bibliografia

• 1. Blaine W, Haileyesus W (2013) Copper delineation with clarity3D™ DSIP/Resistivity System. Canadian Exploration Geophysical Society. 2 Mar 2013
• 2. DCIP3D Manual (V 2.1). University of British Columbia Geophysical Inversion Facility, Department of Earth and Ocean Sciences
• 3. Fink JB, McAlister EO, Sternberg BK, Wieduwilt WG, Ward SH (1990) Induced polarization, applications and case histories, vol. 4: investigations in geophysics, Society of Exploration Geophysicists, Tulsa, Oklahoma
• 4. Huan M, Handong T, Yue G (2015) Three-dimensional induced polarization parallel inversion using nonlinear conjugate gradients method. Hindawi Publishing Corporation, Mathematical Problems in Engineering Volume 2015, Article ID 464793, 12 pages
• 5. Li Y, Oldenburg DW (1997) 3-D inversion of induced polarization data. Electrical and Electromagnetic Methods, Paper 71. In: Gubins AG (ed) Proceedings of exploration 97: fourth decennial international conference on electromagnetic methods, 1997, pp 549–552
• 6. Li Y, Oldenburg DW (2000) 3-D inversion of induced polarization data. Geophysics 65(6):1931–1945
• 7. Mungall J, Harvey J, Balch S, Azar B, Atkinson J, Hamilton M (2010) Eagle’s nest: a magmatic ni–sulfide deposit in the James Bay Lowlands, Ontario, Canada. Society of Economic Geologists, Inc. Spec Publ 15:539–557
• 8. Noront resources (2007) Reports assays for 1st and 2nd holes Double Eagle (cu,ni,pge) Project, James Bay Lowlands, Ontario. http://norontresources.com/noront-reports-assays-for-1st-and-2nd-holes-double-eagle-cunipge-project-james-bay-lowlands-ontario/
• 9. Oldenburg D, Li Y (2005) Inversion for applied geophyscis: a tutorial. In: Butler D (ed) Near-surface geophysics, SEG investigations in geophysics series No 13, pp 89–150
• 10. Oldenburg D, Pratt D (2007) Geophysical inversion for mineral exploration: a decade of progress in theory and practice. In: Milkereit B (ed) Proceedings of exploration 07: fifth decennial international conference on mineral exploration, pp 61–95
• 11. Oldenburg DW, Li Y, Ellis RG (1997) Inversion of geophysical data over a copper gold porphyry deposit: a case history for Mt. Milligan. Geophysics 62(5):1419–1431
• 12. Perri MT, Cassiani G, Gervasio I, Deiana R, Binley A (2012) A saline tracer test monitored via both surface and cross-borehole electrical resistivity tomography: comparison of time-lapse results. J Appl Geophys 79:6–16
• 13. Power C, Gerhard JI, Tsourlos P, Soupios P, Simyrdanis K, Karaoulis M (2015) Improved time-lapse electrical resistivity tomography monitoring of dense non-aqueous phase liquids with surface-to-horizontal borehole arrays. J Appl Geophys 112:1–13
• 14. Power C, Tsourlos P, Ramasamy M, Nivorlis A, Mkandawire M (2018) Combined DC resistivity and induced polarization (DC-IP) for mapping the internal composition of a mine waste rock pile in Nova Scotia, Canada. J Appl Geophys 150:40–51
• 15. Seigel H, Nabighian M, Parasnis D, Vozoff K (2007) The early history of the induced polarization method. Lead Edge 26:312–321
• 16. Stott G (2007a) Precambrian geology of the Hudson Bay and James Bay lowlands region interpreted from aeromagnetic data–east sheet. Ontario Geological Survey, Preliminary Map P. 3598, scale 1:500 000
• 17. Stott G (2007b) Precambrian geology of the Hudson Bay and James Bay lowlands region interpreted from aeromagnetic data–west sheet. Ontario Geological Survey, Preliminary Map P. 3597, scale 1:500 000
• 18. Telford WM, Geldart LP, Sheriff RE (1990) Applied geophysics, 2nd edn. Cambridge University Press, Cambridge
• 19. White RMS, Collins S, Denne R, Hee R, Brown P (2001) A new survey design for 3D IP inversion modelling at Copper Hill. Explor Geophys 2001(32):152–155
• 20. Yuval D, Oldenburg W (1996) DC resistivity and IP in acid mine drainage problems: results from the Copper Cliff mine tailings impoundments. J Appl Geophys 34(1996):187–198