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Geology
- Property Geology
The Rio Grande copper-gold prospect is located within a partially eroded, earliest Middle Miocene (16.5 Ma), andesite-dominated volcanic-intrusive complex of high-K, calc-alkaline affinity. The Rio Grande complex intrudes through granitic basement rocks into a continental back-arc basin filled with a thick (>1500m), oxidized sequence of continental red bed sandstones (Figure 1). Sections within this sequence contain sulphate evaporites and possible halite in the upper parts of the section. Host rocks include a wide variety of dacite to andesite, sub-volcanic, hypabyssal intrusive rocks and dykes (Figures 2 and 3).
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