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TitleMultiparameter geophysical logging at the Yava lead deposit: a statistical approach
AuthorCinq-Mars, A; Mwenifumbo, C J; Killeen, P G; Chouteau, M
SourceGeophysical Prospecting vol. 40, no. 8, 1992 p. 829-848,
Alt SeriesGeological Survey of Canada, Contribution Series 16692
Mediapaper; on-line; digital
File formatpdf
ProvinceNova Scotia
AreaYava Lead deposit
Subjectsmetallic minerals; geophysics; general geology; statistical analyses; statistical methods; mineral exploration statistics; mineralization; sulphides; galena; clay minerals; lead; sphalerite; gamma-gamma ratio; (SGG ratio); principal component analysis (PCA)
Illustrationsgraphs; diagrams; histograms; plots
ProgramCanada-Nova Scotia Mineral Development Agreement, 1984-1989
AbstractThe present study describes multiparameter geophysical logging carried out at the Yava sandstone lead deposit, Nova Scotia, Canada. Statistical analysis of the multiparameter data set shows that the spectral gamma-gamma ratio log (SGG ratio) is the most useful technique
for characterizing the disseminated sulphide mineralization. Principal component analysis (PCA) indicates that the apparent chargeability
(IP parameter) responds to the presence of clay minerals in the sandstone in addition to disseminated sulphides, so that the induced polarization method (IP) does not accurately delineate the disseminated galena content as was originally assumed in the preliminary log interpretation. PCA has also confirmed that the SGG ratio and density are related to lead content and that lithological variations can be delineated with natural radioactivity and resistivity. The zinc content of the deposit was poorly characterized by geophysical logs. Sphalerite occurrences seem to be localized as narrow bands (< 1 cm) which were not geophysically detectable.

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