'Institute of Geological Sciences of the National Academy of Sciences of Ukraine'
Abstract
An airborne geophysical survey was carried out
over part of upper Swaledale and the adjacent
moorland. The area has a long history of mining
and the geology and style of mineralisation are
representative of most of the north Pennine orefield.
The survey employed magnetic, electromagnetic
and radiometric methods, and provided
a test of the applicability of airborne geophysical
exploration in this environment. Eleven airborne
electromagnetic anomalies were followed up with
detailed ground surveys; more limited surveys were
employed to check several smaller airborne
indications. At two sites the follow-up surveys
recorded anomalies sufficiently significant to be
considered possible indications of mineralisation.
One of these, at Oxnop Gill, was tested by core
drilling, but no evidence of significant mineralisation
was found. The other site, Whirley Gill, was
not drilled, and the anomalies, although promising,
remain unexplained. Of the remaining airborne
anomalies, some were not detectable on the ground
and others were considered to be due to stratigraphical
or artificial conductors. It is concluded
that the particular airborne EM system employed
is not an effective tool in exploration for new
mineral veins of the kind known in the northern
Pennines
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