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- W1946196740 abstract "The results of geochemical, geological and geophysical surveys over Lower Palaeozoic rocks in thesouth-western part of Cumbria are given in two reports. This report (Part 1) describes the results of ageochemical drainage survey and an examination of mineralised sites, and relates them to informationfrom new geological mapping and an assessment of regional geophysical data. Part 2 contains detailsof follow-up surveys in the Black Combe inlier.The geochemical drainage survey, involving the collection and analysis of heavy mineral concentratesand stream sediment samples from 119 sites, found substantial antimony, arsenic, barium, bismuth,copper, iron, lead, tin, tungsten and zinc anomalies. Gold was reported for the first time from this partof the Lake District: small amounts were noted in panned concentrates from five sites. Other mineralsidentified in panned concentrates included arsenopyrite, baryte, bismutite, bismuthinite, cassiterite,chalcopyrite, cerussite, pyrite, pyromorphite, scheelite, sphalerite, stolzite and wolfram&e.The examination of old workings and outcrops revealed many undocumented occurrences of quartzsulphidevein-style mineralisation. The chemical analysis of samples taken from old workings andother occurrences confirmed field observations that locally, particularly in the Black Combe area, thismineralisation is polymetallic with variable amounts of arsenic, gold, bismuth, copper, lead, zinc andin a few cases antimony, barium, cobalt, nickel, tungsten and tin. Iron mineralisation occurs both asoxide (hematite) and sulphide deposits. Mercury was present in appreciable amounts in samples fromthe High Brow pyrite mine.The distribution of panned concentrate anomalies suggests that the vein-style mineralisation ispolyphase and that individual phases may be zoned. Highest zinc anomalies occur near Torver and thehighest lead on the west side of Black Combe. Tin and tungsten are restricted largely to the centralpart of Black Combe, and the most prominent arsenic and bismuth anomalies are found in the samearea. Copper anomalies are widespread over the Skiddaw Group and the Borrowdale Volcanic Group.Barium anomalies indicate that baryte mineralisation is weak and localised, occurring principallywithin the Black Combe area and close to the Windermere Supergroup basal unconformity. Ironoxides from host rocks and hematite mineralisation are responsible for local enrichments of iron,antimony, arsenic and molybdenum in panned concentrates." @default.
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- W1946196740 date "1993-01-01" @default.
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- W1946196740 title "Mineral exploration in the Lower Palaeozoic rocks of south-west Cumbria. Part 1, regional surveys" @default.
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