Historical accounts of copper mining near\ud Middleton Tyas in the 18th century show that\ud small tonnages of very rich ore were dug from\ud veins, flats or irregular cavities in the Underset\ud Limestone. The mineralisation probably originated\ud from metalliferous brines migrating from the\ud Stainmore Trough or a similar Lower Carboniferous\ud sedimentary basin to the east. The possibility\ud that the mineralisation was syngenetic has been\ud investigated but is now discounted; similarly, boreholes\ud through the local Permian succession to test\ud whether a Kupferschiefer facies of the Marl Slate\ud is present locally, gave negative results. The\ud primary copper sulphides were subsequently\ud enhanced in grade by supergene enrichment under\ud arid conditions during early Permian times.\ud Much of the outcrop of the Main and Underset\ud limestones within the Middleton Tyas anticline\ud is heavily drift-covered. Anomalous copper values\ud in soils have been found over about 6 sq km, but\ud it is not known whether these are due to ice\ud dispersion or whether they mark hidden copper\ud deposits. An IP survey in the area was hampered\ud by the presence of strong artificial conductors
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