Mineral investigations near Bodmin, Cornwall. Part 3, the Mulberry and Wheal Prosper area

Investigations in the area between the former opencast tin workings of Mulberry and Wheal Prosper suggest that the most promising ground for future mineral exploration lies to the south of the latter workings. The north-south Mulberry mineralisation trend, although recognisable south of the calcsilicate belt, gives rise to only sporadic and lowamplitude tin anomalies in the soils. Near to the surface there is no evidence of an analogue of the Mulberry deposit; its existence or absence at depth could only be proved by speculative drilling. Traced westwards, the Prosper mineralisation becomes more tenuous and, at shallow depth, uneconomic. Strong geochemical evidence, supported by less f’lrm geophysical indications, points to the presence of a previously unrecognised mineralised zone subparallel to the Prosper vein sheets and some 200 m south of them. The presence of tin, copper, zinc and a little tungsten is indicated.