The epizonal Ag-Pb-Zn vein deposit at San Bartolome is characterised by a base-metal sulphide assemblage containing
the spectacular development of interpenetrating, bladed networks of pyrrhotite which have been replaced by marcasite and
pyrite. A similar assemblage displaying the same crystal habits and textures are also a diagnostic feature of the Sn and Sn- Ag deposits of Bolivia. On this basis, it is reasonable to conclude that both deposits were formed from fluids of similar
nature and origin. Although no economic accumulation of Sn is known in San Bartolomr, further comparison of the
geologic setting, age, mineralogy, fluid inclusion data and magmatic association of this deposit with the Bolivian systems
has highlighted additional similarities consistent with a hypothesis that more extensive Sn mineralisation might exist in
the San Bartolomd area.