Natural Environment Research Council Institute of Geological Sciences Mineral Reconnaissance Programme Report A report prepared for the Department of Industry - - - - - - - - This report relates to work carried out by the Institute of Geological Sciences on behalf of the Department of Industry. The information contained herein must not be published without reference to the Director, Institute of Geological Sciences 0. Ostle Programme Manager Institute of Geological Sciences Keyworth, Nottingham NG 12 5GG Report 44 Reconnaissance geochemical maps of parts of south Devon and Cornwall INSTITUTE OF GEOLOGICAL SCIENCES Natural Environment Research Council Mineral Reconnaissance Programme Report No. 44 Reconnaissance geochemical maps I of parts of south Devon and Cornwall R. C. Jones, BSc 0 Crown copyright 1987 London 1981 A report prepared for the Department of Industry m t 1 0 I 1 I I t t 1 1 1 t 3 t 1 1 t 1 I Mineral Reconnaissance Programme Reports 30 Porphyry style copper mineralisation at Black Stockarton Moor,south-west Scotland 1 The concealed granite roof in south-west Cornwall 31 Geophysical investigations in the 2 Geochemical and geophysical investigations around Closehouse-Lunedale area Garras Mine, near Truro, Cornwall 32 Investigations ar Polyphant, near Launceston, 3 Mplybdenite mineralisation in Precambrian rocks Cornwall near Lairg, Scotland 33 Mineral investigations at Carrock Fell, Cumbria. Part 4 Investigation of copper mineralisation at Vidlin, 1 -Geophysical survey Shetland 34 Results of a gravity survey of the south-west margin 5 Preliminary mineral reconnaissance of Central Wales of Dartmoor, Devon 6 Report on geophysical surveys at Struy, Inverness- 35 Geophysical investigation of chromite-bearing shire ultrabasic rocks in the Baltasound-Hagdale area, 7 Investigation of tungsten and other mineralisation Unst, Shetland Islands ~ associated with the Skiddaw Granite near Carrock 36 An appraisal of the VLF ground resistivity technique Mine, Cumbria as an aid to mineral exploration 8 Investigation of stratiform sulphide mineralisation in 37 Compilation of stratabound mineralisation in the parts of central Perthshire Scottish Caledonides 9 Investigation of disseminated copper mineralisation 38 Geophysical evidence for a concealed eastern near Kilmelford, Argyllshire, Scotland extension of the Tanygrisiau microgranite and its 10 Geophysical surveys around Talnotry mine, possible relationship to mineralisation Kirkcudbrightshire, Scotland 39 Copper-bearing intrusive rocks at Cairngarroch Bay, 11 A study of the space form of the Cornubian granite south-west Scotland batholith and its application to detailed gravity 40 Stratabound barium-zinc mineralisation in Dalradian surveys in Cornwall schist near Aberfeldy, Scotland: Final report 12 Mineral investigations in the Teign Valley, Devon. 41 Metalliferous mineralisation near Lutton, Ivybridge, Part l -8&ytes Devon 13 Investigation of stratiform sulphide mineralisation at 42 Mineral exploration in the area around Culvennan McPhun’s Cairn, Argyllshire Fell, Kirkcowan, south-western Scotland 14 Mineral investigations at Woodhall and Longlands in 43 Disseminated copper-molybdenum mineralisation north Cumbria near Ballachulish, Highland Region 15 Investigation of stratiform sulphide mineralisation at 44 Reconnaissance geochemical maps of parts of south Meall Mor, South Knapdale, Argyll Devon and Cornwall 16 Report on geophysical and geological surveys at Blackmount, Argyllshire 17 Lead, zinc and copper mineralisation in basal Carboniferous rocks at Westwater, south Scotland 18 A mineral reconnaissance survey of the Doon-Glenkens area, south-west Scotland 19 A reconnaissance geochemical drainage survey of the Criffel-Dalbeattie granodiorite complex and its environs 20 Geophysical field techniques for mineral exploration 21 A geochemical drainage survey of the Fleet granitic complex and its environs 22 Geochemical and geophysical investigations north- west of Llanrwst, North Wales 23 Disseminated sulphide mineralisation at Garbh Achadh, Argyllshire, Scotland 24 Geophysical investigatiOns along parts of the Dent The Institute of Geological Sciences was formed by the and Augill Faults incorporation of the Geological Survey of Great Britain and 25 Mineral investigations near Bodmin, Cornwall. Part the Geological Museum with Overseas Geological Surveys 1 -Airborne and ground geophysical surveys and is a constituent body of the Natural Environment Research Council 26 Stratabound barium-zinc mineralisation in Dalradian schist near Aberfeldy, Scotland: Preliminary r&port 27 Airborne geophysical survey of part of Anglesey, Bibliographical reference North Wales Jones, R. C. 1981. Reconnaissance geochemical mapsof parts of south Devon and Cornwall Mineral 28 A mineral reconnaissance survey of the Reconnaissance Programme Rep. Inst. Geol. Sci., No. 44 Abington-Biggar-Moffat area, south-central Scotland 29 Mineral exploration in the Harlech Dome, North Photocopied in England for the Institute of Geological Sciences by Wales Four Point Printing I This brief report accompanies the following 29 Zirconium in stream sediments, Camelford and 8 1:50 000 scale geochemical maps, which are placed Padstow area on open file at the offices of the Institute of 30 Zirconium in stream sediments, Launceston Geological Sciences at London, Keyworth, Exeter, and Okehampton area Leeds and Edinburgh. 31 Zirconium in stream sediments, Truro, Bodmin I and Liskeard area 1 Chromium in stream sediments, Camelford and 32 Zirconium in stream sediments, South Devon Padstow area* and the Tamar Estuary area 8 2 Chromium in stream sediments, Launceston 33 Molybdenum in stream sediments, Camelford and Okehampton area* and Padstow area 3 Chromium in stream sediments, Truro, Bodmin 34 Molybdenum in stream sediments, Launceston t and Liskeard area* and Okehampton area 4 Chromium in stream sediments, South Devon 35 Molybdenum in stream sediments, Truro, and the Tamar Estuary area* Bodmin and tiskeard area 5 Manganese in stream sediments, Camelford and 36 Molybdenum in stream sediments, South t Padstow area Devon and the Tamar Estuary area 6 Manganese in stream sediments, Launceston 37 Tin in stream sediments, Camelford and and Okehampton area Padstow area 8 7 Manganese in stream sediments, Truro, Bodmin 38 Tin in stream sediments, Launceston and and Liskeard area Okehampton area 8 Manganese in stream sediments, South Devon 39 Tin in stream sediments, Truro, Bodmin and and the Tamar Estuary area Liskeard area I 9 Iron in stream sediments, Camelford and 40 Tin in stream sediments, South Devon and the Padstow area Tamar Estuary area 10 Iron in stream sediments, Launceston and 41 Barium in stream sediments, Camelford and I Okehampton area Padstow area 11 Iron in stream sediments, Truro, Bodmin and 42 Barium in stream sediments, Launceston and Liskeard area Okehampton area 8 12 Iron in stream sediments, South Devon and the 43 Barium in stream sediments, Truro, Bodmin Tamar Estuary area and Liskeard area 13 Cobalt in stream sediments, Camelford and 44 Barium in stream sediments, South Devon and Padstow area the Tamar Estuary area I 14 Cobalt in stream sediments, Launceston and 45 Lead in stream sediments, Carnelford and Okehampton area Padstow area 15 Cobalt in stream sediments, Truro, Bodmin and 46 Lead in stream sediments, Launceston and I Liskeard area Okehampton area 16 Cobalt in stream sediments, South Devon and 47 Lead in stream sediments, Truro, Bodmin and the Tamar Estuary area Liskeard area t I7 Nickel in stream sediments, Camelford and 48 Lead in stream sediments, South Devon and Padstow area the Tamar Estuary area 18 Nickel in stream sediments, Launceston and 49 Uranium in stream sediments, Camelford &d Okehampton area Padstow area. 8 19 Nickel in stream sediments, Truro, Bodmin 1 and 50 Uranium in stream sediments, Launceston and Liskeard area Okehampton area. 20 Nickel in stream sediments, South Devon and 51 Uranium in stream sediments, Truro, Bodmin I the Tamar Estuary area and Liskeard area. 21 Copper in stream sediments, Camelford and 52 Uranium in stream sediments, South Devon Padstow area and the Tamar Estuary area. 22 Copper in stream sediments, Launceston and 53 Titanium in panning concentrates, Camelford t Okehampton area and Padstow area. 23 Copper -in stream sediments, Truro, Bodmin 54 Titanium in panning concentrates, Launceston and Liskeard area and Okehampton area. I 24 Copper in stream sediments, South Devon and 55 Titanium in panning concentrates, Truro, the Tamar Estuary area Bodmin and Liskeard area. 25 Zinc in stream sediments, Camelford and 56 Titanium in panning concentrates, South 8 Padstow area Devon and the Tamar Estuary area. 26 Zinc in stream sediments, Launceston and 57 Manganese in panning concentrates, Camelford Okehampton area and Padstow area. 27 Zinc in stream sediments, Truro, Bodmin and 58 Manganese in panning concentrates, Launceston 8 Liskeard area and Okehampton area. 28 Zinc in stream sediments, South Devon and the 59 Manganese in panning concentrates, Truro, t Tamar Estuary area Bodmin and Liskeard area. 1 I 60 Manganese in panning concentrates, South 91 Cerium in panning concentrates, Truro, Devon and the Tamar Estuary area. Bodmin and Liskeard area. 61 Iron in panning concentrates, Camelford and 92 Cerium in panning concentrates, South Devon Padstow area. and the Tamar Estuary area. 62 Iron in panning concentrates, Launceston and Okehampton area. * The Camelford and Padstow area is bounded by National 63 Iron in panning concentrates, Truro, Bodmin Grid lines ’ 80 and 2