'Institute of Geological Sciences of the National Academy of Sciences of Ukraine'
Abstract
A geochemical drainage survey of South Devon and
Cornwall was conducted between 1970 and 1976.
Efforts were made to maintain a consistent
sampling method, but because of improvements in
analytical techniques, and changes in instrumentation,
there is an unavoidable variation in absolute
values from area to area. For this reason the raw
data are presented using an expanding polygon
display which emphasises local variations in
element concentration.
The results contain many anomalous
concentrations of elements of potential economic
value but few of these are likely to be of significance,
considering the high level of contamination,
from past mine workings and from refuse, which
exists in the region. Efforts were made to avoid
collecting samples badly contaminated by
agricultural or domestic refuse, or at locations
immediately downstream of roads. It was considered
that, where the drainage was contaminated by
mine waste, benefit could be gained from the
sample analysis as a check on the records of ore
components from that mine. It will be noticed
that, in several cases, the presence of ore elements
not mentioned in the records is thus brought to
light. As one purpose of this survey was to
determine if there was any significant mineralisation
outside the established mining areas of South
Devon and Cornwall, samples were not collected
from the most intensively mined areas such as the
southern edge of the St Austell Granite
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