CSA Global Senior Consulting Geologist, Matthew Bodnar will present on “1324 – Mapping and Modeling Geochemical Dispersion Above a Till concealed Polymetallic Volcanogenic Massive Sulphide Deposit” at the MIN29: Exploration Undercover – Techniques, Technology and Strategy I Session (AAG: 28th International Applied Geochemistry Symposium).
The Resources for Future Generations Premier Conference on Energy, Minerals, Water, The Earth, on June 16-21, 2018, Vancouver Convention Center, British Columbia, CANADA.
The presentation by Matthew will be delivered on Thursday June 21, 2018 at 9.45am, Room 110.
A model of landscape evolution was developed to assist the identification of natural processes that govern geochemical responses in shallow soil in glaciated terrain. Detailed surficial material mapping and soil sampling was completed over the concealed Lara polymetallic volcanogenic massive sulphide deposit, Vancouver Island, BC, Canada. Upper B horizon soil and physicochemical property measurements were collected along four transects over the deposit and host-rocks. The -180 μm fraction was analyzed by aqua regia ICP-MS/AES, fpXRF and for magnetic susceptibility. Select samples were analyzed by sequential extraction to establish the provenance of geochemical responses. Surficial materials including till, alluvium and colluvium were identified representing complex alpine glacial and paraglacial processes. Most recent glacial ice flow was valley controlled and sub-parallel to the strike mineralization. The highest Zn response occurs directly over the Lara deposit; however, Cr, Ni, Co and Sc content and magnetic susceptibility indicate the response is related to gabbroic material in the till matrix. A strong response of Zn, Cu, Cd, Mo, Se, Hg, and Te occur over a narrow pyrite stringer zone 150 m north of the Lara mineralization. Sequential extraction chemical analysis indicates that geochemical responses by conventional are attributed to primary minerals in the soil matrix and not hydromorphic metal scavenging effects. Geochemical responses in B horizon soil above the VMS and pyrite zone are interpreted to be caused clastic dispersion of mineralization and mafic host-rocks by glacial transport with negligible input by biochemical cycling. Further, the responses are discontinuous across the landscape where glacial sediment has been eroded and re-deposited, demonstrating that landscape mapping is critical for efficient and accurate interpretation of geochemical responses in recently glaciated covered terrain.
Senior Consulting Geologist
M.Sc. Exploration Geochemistry
Matt is a geologist with (9) years’ experience in industry coupled with recent completion of a Masters in geochemistry. He has demonstrated skills of integrated multi-disciplinary mineral exploration data analysis and targeting strategy with a specialization in exploration geochemical methods in covered terrain utilizing terrain mapping, quaternary geology and the principles of landscape geochemistry. Significant experience in the exploration for polymetallic magmatic Ni-Cu-PGE deposits within a multi-national mining house and continuing along the path to discovery with an interest in maximizing field programs through the integration of emerging analytical and geospatial technologies