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TitleGeochemical signatures of porphyry deposits in ground and stream waters: erosion, enrichment, and alteration
AuthorKidder, J AORCID logo
Source29th international applied geochemistry symposium; 2022 p. 38
LinksOnline - En ligne
Alt SeriesNatural Resources Canada, Contribution Series 20220092
PublisherAssociation of Applied Geochemists
MeetingInternational Applied Geochemistry Symposium; Vina del Mar; CL; October 23-28, 2022
Mediapaper; digital; on-line
File formatpdf
Subjectsgeochemistry; mineralogy; porphyry deposits; groundwater; streams
ProgramTargeted Geoscience Initiative (TGI-6) Ore systems
Released2022 10 23
AbstractThe dispersion of metals in ground and surface waters from hydrothermal mineral deposits has been shown to be an effective vector in mineral exploration and where water can be sampled, a tool to explore where deposits are deeply emplaced or covered by post-mineral deposits. The atypical geochemical signatures (Mo, Se, Re, As, Cu) of porphyry systems are commonly reflected in water chemistry around mineral occurrences. However, the successful application of hydrogeochemistry in mineral exploration requires an understanding of the geological and hydrological controls on metal dispersion in aqueous environments. Such variation can be introduced as a function of (but not limited to): (i) aqueous chemistry; (ii) deposit weathering and extent of secondary enrichment; (iii) erosion; (iv) hydrology; as well as (v) development and extent of alteration. Understanding this variation is key to interpreting hydrogeochemical datasets in different settings and establishing background thresholds. A multifaceted approach to hydrogeochemical mineral exploration, coupling trace elements and stable isotope geochemistry is the most effective vectoring approach. This talk presents recent work undertaken at the Casino porphyry in the Dawson Range, Yukon, as well as presenting comparisons from studies globally, to provide a range of prospective hydrogeochemical signatures associated with expected geological scenarios. This talk aims to highlight effective methodologies for exploration hydrogeochemistry.
Summary(Plain Language Summary, not published)
The analysis of ground and stream waters containing dissolved metals from ore deposits is a useful mineral exploration method. The fate of metals in waters varies according to hydrology and geology which can change the geochemical signature.

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