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Examples
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Gold mineralization in the rhyodacite porphyry is associated with disseminated and veinlet controlled sulfide mineralization.
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These three holes test a gold mineralized area of about 150 m by 470 meters (approximately 450 feet by 1500 feet), and the mineralized rhyodacite remains open to expansion to the south, southwest and southeast.
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Mineralization in these three holes occurs primarily in a rhyodacite quartz porphyry sill which intrudes siltstone, sandstone and andesite, and measures 117.6 meters (approximately 350 feet) thick in DDH CC09-14 (based on the geologic projections, this intersection is believed to approximately represent the true thickness of the sill in this location).
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Of particular interest are large areas of mapped rhyodacite and andesite porphyry units which are known to host mineralization elsewhere in the district.
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I was personally excited to hear that South Sister in Oregon has erupted a lot of rhyolite/rhyodacite over its history - including Rock Mesa and Devil's Hills.
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