Lower Carboniferous cherts and limestones lie within the contact metamorphic aureole on the northwest margin of the Dartmoor granite. Tin is concentrated in grossularite selvedges and reaction veins in altered cherts, in the andradite of the skarns, and as malayite in wollastonite hornfelses. Tin mineralization with up to 6.82 percent SnO 2 ... lies within a much wider zone of iron metasomatism in which the resultant skarns may contain up to 0.2 percent SnO 2 . The deposits may be regarded as the calcic analogues of the cassiterite-specular hematite-tourmaline deposits of the northeastern part of the Dartmoor granite.

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