testing a strong salline solution for gold content

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we are working on a project utilizing a high saliine solution coming off a prehistoric shale formation. this is not seawater. possible an early sea or a doposite left as the result a sea action. this liquid is about 10% salt with a little bit of iron oxide plus a bittern like soluton containing potassium, sulfides, magnesium plus some other minerals, an earlier test indicated some silver. any insite would be appreciatred. w. morgan