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In page River Swale:

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There are three distinct geological areas in Upper and Mid Swaledale. The upper reaches of the river flow over Carboniferous, Permian and Triassic rock, all of which are atop a layer of Lower Paleozoic beds.[1] These rocks are rich in minerals[2] and metalliferous sulfide ores such as Galena, Sphalerite, Chalcopyrite and Bravoite. There are also deposits of Fluorite, Barite, Witherite, Calcite, Dolomite and Barytocalcite.[3]