Mineral Resources Map for Hertfordshire
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60 70 80 90 500000 10 20 30 40 50 60 BGS maps covering Hertfordshire and the London Boroughs of Barnet, HYDROCARBONS PEDL36 Enfield, Harrow and Hillingdon CANUK Conventional Oil and Gas ASHWELL Hertfordshire occupies a tract of land beneath which Palaeozoic basement lies at shallow depth. Permian and 204 205 Mesozoic rocks are relatively thin, with the outcrop of overlying Chalk widespread across the county. Palaeogene deposits of the London Basin crop out along the southeastern areas of the county. Few seismic lines have been acquired in the county and the Tring and Ashwell hydrocarbon exploration boreholes 220 221 222 both only just lie within the county. Up to early 2002, no licence blocks are wholly located within the county. PEDL36 (operated by CANUK) extends into the extreme NE of the county. As of July 2002 this licence appeared to 40 HERTFORDSHIRE have been relinquished. At present therefore, Hertfordshire appears to offer little or no hydrocarbon potential. 40 and Mine Gas Drainage, Coal Mine Methane and Coalbed Methane (CBM) potential Report 104 The county shows negligible potential for mine gas drainage, coal mine methane and CBM development. Report 52 NW LONDON BOROUGHS Report 46 Licensing (comprising Hertfordshire and London Boroughs TRING 1 The Department of Trade and Industry grants licences for exclusive rights to explore for and exploit oil and gas 239 240 onshore within Great Britain. The rights granted by landward licences do not include any rights of access, and the of Barnet, Enfield, Harrow and Hillingdon) licensees must also obtain any consent under current legislation, including planning permission. Report 69 Report 67 Mineral Resource Information in Support of National, 200 Report 71 Report 112 Regional and Local Planning Mineral Resources 238 255 Scale 1:100 000 Arlesey Road Sand Pit (Sg) ENFIELD Hydrocarbon well Report 12 BARNET Holwell Sand Pit (Sg) Anstey Chalk Compiled by A.J. Benham, A.N. Morigi, A.J. Bloodworth, D.G. Cameron, D.J. Evans, HARROW G.K. Lott and D.E. Highley. Petroleum Exploration and Development Licence Quarry (Ch) PEDL issued under the Petroleum (Production) Act 1934 Project Leader: D.E. Highley. (as at March 2002) Greystone Limeworks (Ch) HILLINGDON Digital cartography by N.A. Spencer, British Geological Survey. 500 550 Published 2003. Butts Hill (Ch) 256 30 South End of Hitchin 30 Railway Station (Ch) This map comprises part of a summary of the 'Mineral Resources of the East of 269 270 England Region'. For further imformation see www.mineralsUK.com BRICK CLAY West Mill Chalk Pit 'Brick clay' is the term used to describe clay and shale used predominantly in the manufacture of bricks and, to a lesser extent, roof tiles St Ippollitts (Ash Brook) (Sg) Wymondley Pit (Sg) (Down Hall Chalk Pit) (Ch) BIBLIOGRAPHIC REFERENCE and clay pipes. These clays may sometimes be used in cement making, as a source of constructional fill and for lining and sealing landfill sites. The suitability of clay for the manufacture of bricks depends principally on its behaviour during shaping, drying and firing. This will Report 12 Benham, A.J., and 6 others. 2003. Mineral Resource Information in Support of National, Regional and Local Planning: Hertfordshire and 239 1:25 000 map published (Industrial Minerals dictate the properties of the fired brick such as strength and frost resistance and, importantly, its architectural appearance. 1:63 360 and 1:50 000 map published NW London boroughs (comprising Hertfordshire, London Boroughs of Barnet, Enfield, Harrow and Hillingdon). British Geological Survey Assessment Sand and Gravel Resource Map) Commissioned Report CR/03/075N Most facing bricks, engineering bricks and related clay-based building products are manufactured in large automated factories. These Vicars Grove (Sg) represent a high capital investment and are increasingly dependent, therefore, on raw materials with predictable and consistent firing Current digital availability of these sheets can be found on the British Geological Survey website, www.bgs.ac.uk Production of this map was commissioned and funded by the Office of the characteristics in order to achieve high yields of saleable products. Blending different clays to achieve improved durability and to provide a range of fired colours and textures is an increasingly common feature of the brick industry. Continuity of supply of consistent raw Deputy Prime Minister (Contract MP0677). materials is of paramount importance. The sole remaining brickworks in Hertfordshire is located at Bovingdon near Hemel Hempstead. This is a relatively small works that Stortford Lime Works produces mechanically made, 'soft-mud' facing bricks, although about 20 per cent of production is in the form of hand-made stock Langley Sidings Kiln Farm Pit (Sg) (Bishops Stortford) (Ch, Fi) bricks. The bricks are made from the mottled clays of the Reading Formation and Clay-with-Flints. These deposits are broadly similar, although varied in composition, because one (Clay-with-Flints) is largely derived from the other: they are therefore shown as a single (Depot) (CR) Little Hadham Chalk SAND & GRAVEL resource. However, the occurrence at Bovingdon is exceptional rather than typical. For this reason, and because of their patchy Pit (Hadham Lime) (Ch) occurrence and variable nature and thickness (up to 20 m), these deposits are shown as a resource in the Hemel Hempstead area only. Westland Green (Sg) Superficial deposits Frogmore Lodge (Lordship Estate) (Sg) Dowsetts Farm (Ch, Sg) Side Hilly (Sg) Sub-alluvial: Inferred resources The Cock Public House, r/o Rookery Pit (Frogmore Hall (Danesbury Park Road) (Sg) (Including Rookery Pit)) (Sg) 20 Plashes Farm Borrow Pit (Sg) 20 Sub-alluvial: Indicated resources (only in area assessed by BGS) Twyfordbury (Sg) Barwick Ford (Sawtree Wood) (Sg) Three Hills (Codicote Heath) (Sg) Ware (Westmill River terrace deposits Codicote Heath Pits (Sg) Mardley Heath (Sg) Farm) (Sg) Three Hills (Codicote Heath) (Sg) Stoney Hills (Stoney Hills Brickworks) (Cl) River terrace deposits: Concealed (only in area assessed by BGS) Hadham Towers Poles Lane (Pallett’s Pit) (Sg) (Ashbourne Farm) (Sg) Southend Farm (Sg) Welwyn (Oakhill) (Sg) Westmill (Downfield Farm) (Sg) Glaciofluvial sand and gravel (including Kesgrave Sand and Gravel) Westmill Farm (Sg) Poors Land (Sg) Codicote Chalk Pit (Ch) Rickneys (Sg) Hanbury Manor Golf Course (Sg) River Farm (Sg) Ware Quarry (Gentlemans Field, Garrick Land, Middle Field) (Sg) Waterford (Sg) Sawbridgeworth Marshes (Kecksy’s Bridge) (Sg) Glaciofluvial sand and gravel: Concealed (only in area assessed by BGS) Tewin Hill Farm (Sg) Mortimer Road (Pallett’s depot) (Sg) Waterford (Bramfield Ware Quarry (Walton Road, Brazier Landfill site) (Sg) Digswell Plateau (Sg) Lane) (Sg) Ware Quarry (Park Road, Brazier Landfill site) (Sg) Sawbridgworth (Sg) Pitstone (Ch) Digswell Hill Brickworks (Sg, Cl) Waterford Pit (Sg) Ware Park Ware Quarry (Old Pit Park Road) (Sg) Glacial sand and gravel deposits Blackbridge (Sg) Quarry (Sg) High Wych (Rowney Gardens) (Sg) Panshanger (Sg) Broad Oak End (Sg) Amwell Quarry (Sg) Gaddesden Row Brickpit Great Molewod Gravel Chadwell Hill (Ware Road Chalk Pit) (Ch) Cole Green (Holwell Pit (Molewood) (Sg) Amwell Quarry (The Thifts) (Sg) (Butterfields Pit) (Cl) Park Wood) (Sg) Alston Road (Rowenbury) (Sg) Glacial sand and gravel deposits: Concealed (only in area assessed by BGS) Bulbourne Road (Ch) Ware Road (Sg) Amwell Quarry (Sg) Twentieth Mile (Twentieth Amwell Quarry Redricks Lane (Sg) Mile Gravel & Brickworks) Boundary of area assessed for sand and gravel at the indicated Old Station Yard (Old Foxholes Farm (Sg) Presdales (Sg) (Sheepcote Farm) (Sg) Hollingson Meads (Sg) Station Road) (Topsoil) (Sg, Cl) St Margaret’s (Sg) Pogdens Wood (Sg) resource level Birchall Lane (Sg?) Pole Hole (Pole Hole Farm) (Sg) Goslings Stadium (Sg) Rye Meads (Sg) Land at Eastwick (Sg) Approximate southern/western limit of thick glacial deposits on Hempstead Road (Sg) Cole Green (Holwell Hyde Farm) (Sg) Rye Meads Depot (CR) Ryegate Farm (Rye Meads) (Sg) Redbournbury (Redbourn glaciofluvial and river terrace deposits Woodhall Farm (Sg) Water Hall (Sg) Rye Meads (Sg) Treatment Plant) (Ch) Rye Meads (STW) (Sg) 10 BUILDING STONE Hatfield Quarry (Coopers 10 Jersey Farm (Evans Farm) (Sg) Rye Road (off Rye Road) (Sg) Green Lane) (Sg) Broadwater (Sg) Water Hall (Pollards) (Sg) Bramble Lane (Sg) The Cretaceous and Palaeogene successions of Hertfordshire have yielded a limited number of stones for building purposes. Both Chalk Rye House (Sg) CHALK Berkhamsted Widmore Brickworks (Cl) block and flint nodules from the Upper Cretaceous have been extensively used in the past for local building purposes. Berkhamsted Admirals Walk (The Lynch) (Sg) Brickworks Bedwell Park (Ch, Sg) Essex Road (Rye House) (Sg) Brick Works (Cl) Culverwood (Sg) Chalk: Higher purity (93-98% CaCO 3) White Chalk Subgroup (Shootersway Charlton Quartz-cemented sandstones (or Sarsen stones), together with the conglomeratic beds of the Palaeogene succession (Hertfordshire Hatfield Quarry (Sg) Hoddesdonbury (Sg) Mead (Sg) Puddingstone) were also once widely worked for building material and are found extensively in older buildings in the county. There are Brickworks) (Cl) SAND & GRAVEL Rossway Farm (Borrow Pit) (Cl) Hoddesdon (Cock Lane, Broxbournebury) (Sg) Admirals Walk (Sg) no building stone quarries currently operating. Smallford Pit (Colney Chalk: Low purity (<93% CaCO3 ) Grey Chalk Subgroup Heath, Butterwick & Blackfan Wood (Sg) Cock Lane Dobbs Weir (Sg) Sand and