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a sedimentary rock differing from shale in being bound by silica and from slate in having no slate cleavages

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9 Ga; Bjork 1986) volcano-sedimentary rocks dominated by felsic, alkali-rich metavolcanics, metabasites, argillitic schists and marbles of greenschist to amphibolite facies grade (e.
At Los Hojanchos 6 holes totalling 585 metres were drilled into an anomalous zone of anomalous gold and copper, co-incident with IP conductors and banded gossans within widespread argillitic alteration.
Currently, landowners are extracting visible gold within a highly altered hematite quartz-breccia associated with argillitic and propylitic alteration.