Bonsall Leys

Site of Special Scientific Interest · 53.1140, -1.6050

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Derbyshire County PEAK DISTRICT National Park

Condition (Natural England)

Favourable (2)
UnitFeatureConditionArea (ha)Assessed
SK264576 — Favourable 6.44 2012-08-06
SK265573 — Favourable 9.0 2019-09-11

Habitats

Calaminarian grassland, High montane heath and snow bed

Geology & landscape

Mining / Industrial: Lead Mine, Mine Spoil · Geological Period: Carboniferous · Rock Type: Carboniferous Limestone, Limestone

Description

Description Bonsall Moor is an extensive tract of low intensity grazing land on the limestone plateau in the south east corner of the Peak National Park. Situated above the Via Gellia, some three kilometres west of Cromford, Bonsall Leys lies at an altitude of 350 metres and is subject to a relatively harsh climate in the face of the prevailing south westerly wind. Much of the site has been intensively mined for lead from mediaeval to recent times, leaving the remains of some 200 mine shafts and associated spoil heaps, together with areas of open vein workings; some of which are of particular archaeological interest. Soils are therefore disturbed over the greater part of the area, with heavy metal rich, mine spoil heaps scattered throughout. Elsewhere, deep loess deposits occur over Carboniferous limestone which is exposed at the surface in places or present as limestone spoil giving rise to highly calcareous soils. The principal interest of the site lies in its range of grassland communities. Much of the site comprises neutral grassland types of varying plant composition which merge imperceptibly into more species rich calcicolous closed turf over lead mine spoil. There are other areas of more open, heavy metal toxic, mine spoils supporting a characteristic 'metallophyte' vegetation. The site is also exceptionally species rich and contains a number of plants uncommon in the Peak District. The calcicolous grassland contains all of the species characteristic of Derbyshire dales limestone grassland such as sheep’s fescue Festuca ovina, frequent meadow oat grass Avenula pratensis, rough hawkbit Leontodon hispidus and small scabious Scabiosa columbaria. The most interesting sub communities are unusually species rich with frequent grass of parnassus Parnassia palustris together with frog orchid Dactylorhiza viridis and the metallophyte species spring sandwort or 'leadwort' Minuartia verna which it is exceptional to find in a closed turf. These communities grade into more open vegetation growing on mine spoil heaps, where only characteristic metallophytes such as alpine pennycress Noccaea caerulescens and spring sandwort occur together with populations of species locally adapted to heavy metals such as moonwort Botrychium lunaria and mountain pansy Viola lutea. More extensive areas of a range of neutral grasslands, more typical of old meadows, are spread throughout the site. These are characterised by common knapweed Centaurea nigra and crested dog’s tail Cynosurus cristatus. More calcareous sub communities are found on brown calcareous earth soils with quaking grass Briza media, fairy flax Linum catharticum and a range of sedges. Within this range of exceptionally varied communities, several locally uncommon plants are found. No other site of comparable size in the Peak District is known to support eight orchid species including the locally scarce pyramidal orchid Anacamptis pyramidalis, bee orchid Ophrys apifera and occasional fly orchid Ophrys insectifera on spoil heaps.

Species mentioned

English name
search for this in other sites		 Latin name
search with Google		 IUCN / Red List Type Family
moonwort Botrychium lunaria VU fern ophioglossaceae
meadow oat grass Avenula pratensis Not listed in GB list grass poaceae
quaking grass Briza media VU grass poaceae
crested dog's tail Cynosurus cristatus LC grass poaceae
sheep's fescue Festuca ovina LC grass poaceae
pyramidal orchid Anacamptis pyramidalis LC herb orchidaceae
black knapweed Centaurea nigra LC herb asteraceae
frog orchid Dactylorhiza viridis VU herb orchidaceae
rough hawkbit Leontodon hispidus LC herb asteraceae
fairy flax Linum catharticum LC herb linaceae
spring sandwort Minuartia verna Not listed in GB list herb carophyllaceae
alpine pennycress Noccaea caerulescens VU herb brassicaceae
bee orchid Ophrys apifera LC herb orchidaceae
fly orchid Ophrys insectifera VU herb orchidaceae
grass of Parnassus Parnassia palustris VU herb celastraceae
small scabious Scabiosa columbaria LC herb caprifoliaceae
yellow vetch Viola lutea LC herb violaceae

Plant communities

OV37 — Calaminarian grassland

Festuca ovina-Minuartia verna community

Matches 6 species from the description above: Avenula pratensis, Festuca ovina, Linum catharticum, Minuartia verna, Noccaea caerulescens, Viola lutea

Calluna vulgaris, Carex caryophyllea, Carex flacca, Bryum pallens, Pohlia nutans, Dicranum scoparium, Rhytidiadelphus squarrosus, Weissia controversa, Cladonia arbuscula, Cladonia chlorophaea, Cladonia furcata, Cladonia gracilis, Cladonia portentosa, Cladonia pyxidata, Cladonia rangiformis, Coelocaulon aculeatum, Parmelia saxatilis, Achillea millefolium, Cirsium vulgare, Jacobaea vulgaris, Pilosella officinarum, Noccaea caerulescens, Campanula rotundifolia, Cerastium fontanum, Minuartia verna, Anthyllis vulneraria, Lotus corniculatus, Trifolium repens, Geranium robertianum, Thymus praecox, Linum catharticum, Euphrasia officinalis, Plantago lanceolata, Rumex acetosa, Galium saxatile, Galium sterneri, Viola lutea, Agrostis capillaris, Agrostis stolonifera, Anthoxanthum odoratum, Arrhenatherum elatius, Avenula pratensis, Dactylis glomerata, Festuca ovina, Festuca rubra, Koeleria macrantha

CG12 — Alpine and subalpine calcareous grassland, High montane heath and snow bed

Festuca ovina-Alchemilla alpina-Silene acaulis dwarf-herb community

Matches 4 species from the description above: Botrychium lunaria, Festuca ovina, Linum catharticum, Viola lutea

Empetrum nigrum, Calluna vulgaris, Kalmia procumbens, Vaccinium myrtillus, Salix herbacea, Carex bigelowii, Carex demissa, Carex panicea, Carex pilulifera, Carex pulicaris, Juncus trifidus, Juncus triglumis, Luzula campestris, Luzula multiflora, Luzula spicata, Luzula sylvatica, Diphasiastrum alpinum, Huperzia selago, Selaginella selaginoides, Andreaea alpina, Aulacomnium turgidum, Bartramia ithyphylla, Breutelia chrysocoma, Mnium hornum, Dicranum scoparium, Ditrichum flexicaule, Racomitrium canescens sens.lat., Racomitrium fasciculare, Racomitrium lanuginosum, Ctenidium molluscum, Hylocomium splendens, Hypnum callichroum, Hypnum cupressiforme, Hypnum hamulosum, Lescuraea incurvata, Pleurozium schreberi, Pseudoscleropodium purum, Rhytidiadelphus loreus, Rhytidiadelphus squarrosus, Rhytidiadelphus triquetrus, Sanionia uncinata, Thuidium delicatulum, Thuidium tamariscinum, Pogonatum urnigerum, Polytrichastrum alpinum, Tortella tortuosa, Barbilophozia hatcheri, Barbilophozia lycopodioides, Diplophyllum albicans, Frullania tamarisci, Nardia scalaris, Plagiochila asplenioides, Ptilidium ciliare, Scapania subalpina, Tritomaria quinquedentata, Cetraria islandica, Cladonia arbuscula, Cladonia gracilis, Cladonia pyxidata, Cladonia uncialis, Peltigera canina, Achillea millefolium, Antennaria dioica, Gnaphalium supinum, Hieraclium spp., Scorzoneroides autumnalis, Solidago virgaurea, Taraxacum officianalis, Myosotis alpestris, Cardamine pratensis, Draba norvegica, Campanula rotundifolia, Succisa pratensis, Cerastium alpinum, Cerastium fontanum, Minuartia sedoides, Sagina saginoides, Silene acaulis, Sedum rosea, Vaccinium vitis-idaea, Thymus praecox, Linum catharticum, Epilobium anagallidifolium, Euphrasia frigida, Euphrasia officinalis, Oxalis acetosella, Plantago maritima, Veronica alpina, Veronica officinalis, Veronica serpyllifolia, Armeria maritima, Polygonum viviparum, Rumex acetosa, Anemone nemorosa, Ranunculus acris, Thalictrum alpinum, Trollius europaeus, Alchemilla alpina, Alchemilla filicaulis, Filipendula ulmaria, Geum rivale, Potentilla crantzii, Potentilla erecta, Sibbaldia procumbens, Galium boreale, Galium saxatile, Saxifraga aizoides, Saxifraga hypnoides, Saxifraga nivalis, Saxifraga oppositifolia, Saxifraga stellaris, Viola lutea, Viola palustris, Viola riviniana, Agrostis canina, Agrostis capillaris, Anthoxanthum odoratum, Deschampsia cespitosa, Deschampsia flexuosa, Festuca ovina, Festuca rubra, Festuca vivipara, Nardus stricta, Poa pratensis, Botrychium lunaria

U14 — High montane heath and snow bed, Upland dry heath

Alchemilla alpina-Sibbaldia procumbens dwarf-herb community

Matches 2 species from the description above: Botrychium lunaria, Festuca ovina

Vaccinium myrtillus, Salix herbacea, Carex bigelowii, Carex pilulifera, Juncus trifidus, Luzula multiflora, Luzula spicata, Diphasiastrum alpinum, Huperzia selago, Selaginella selaginoides, Andreaea alpina, Pohlia nutans, Dicranum scoparium, Racomitrium aquaticum, Racomitrium canescens sens.lat., Racomitrium fasciculare, Racomitrium heterostichum, Racomitrium lanuginosum, Ctenidium molluscum, Hylocomium splendens, Hypnum callichroum, Pleurozium schreberi, Rhytidiadelphus loreus, Rhytidiadelphus squarrosus, Rhytidiadelphus triquetrus, Sanionia uncinata, Oligotrichum hercynicum, Pogonatum urnigerum, Polytrichastrum alpinum, Polytrichum piliferum, Barbilophozia floerkei, Diplophyllum albicans, Lophozia sudetica, Nardia scalaris, Ptilidium ciliare, Cetraria islandica, Cladonia arbuscula, Cladonia bellidiflora, Cladonia pyxidata, Achillea millefolium, Gnaphalium supinum, Scorzoneroides autumnalis, Campanula rotundifolia, Cerastium alpinum, Cerastium fontanum, Minuartia sedoides, Sagina saginoides, Silene acaulis, Thymus praecox, Euphrasia officinalis, Armeria maritima, Polygonum viviparum, Rumex acetosa, Ranunculus acris, Thalictrum alpinum, Trollius europaeus, Alchemilla alpina, Alchemilla filicaulis, Alchemilla glabra, Potentilla erecta, Sibbaldia procumbens, Galium saxatile, Saxifraga hypnoides, Saxifraga oppositifolia, Saxifraga stellaris, Viola palustris, Agrostis canina, Agrostis capillaris, Anthoxanthum odoratum, Deschampsia cespitosa, Deschampsia flexuosa, Festuca ovina, Festuca rubra, Nardus stricta, Blechnum spicant, Botrychium lunaria

U10 — High montane heath and snow bed, Lowland dry acid grassland, Upland dry heath

Carex bigelowii-Racomitrium lanuginosum moss-heath

Matches 1 species from the description above: Festuca ovina

Empetrum nigrum, Kalmia procumbens, Vaccinium myrtillus, Salix herbacea, Carex bigelowii, Carex panicea, Carex pilulifera, Juncus squarrosus, Juncus trifidus, Luzula spicata, Diphasiastrum alpinum, Huperzia selago, Selaginella selaginoides, Andreaea alpina, Aulacomnium turgidum, Pohlia nutans, Campylopus flexuosus, Dicranum fuscescens, Dicranum scoparium, Kiaeria starkei, Racomitrium fasciculare, Racomitrium heterostichum, Racomitrium lanuginosum, Hylocomium splendens, Hypnum callichroum, Hypnum cupressiforme, Hypnum hamulosum, Pleurozium schreberi, Rhytidiadelphus loreus, Sanionia uncinata, Polytrichastrum alpinum, Polytrichum juniperinum, Polytrichum longisetum, Polytrichum piliferum, Polytrichum strictum, Anastrepta orcadensis, Diplophyllum albicans, Nardia scalaris, Ptilidium ciliare, Alectoria nigricans, Cetraria islandica, Cladonia arbuscula, Cladonia cervicornis, Cladonia coccifera, Cladonia crispata, Cladonia furcata, Cladonia gracilis, Cladonia impexa, Cladonia pyxidata, Cladonia rangiferina, Cladonia squamosa, Cladonia uncialis, Cornicularia aculeata, Ochrolechia frigida, Peltigera canina, Sphaerophorus globosus, Thamnolia vermicularis, Achillea millefolium, Antennaria dioica, Gnaphalium supinum, Solidago virgaurea, Campanula rotundifolia, Succisa pratensis, Minuartia sedoides, Silene acaulis, Vaccinium vitis-idaea, Thymus praecox, Armeria maritima, Polygonum viviparum, Rumex acetosa, Alchemilla alpina, Potentilla erecta, Sibbaldia procumbens, Galium saxatile, Viola palustris, Viola riviniana, Agrostis capillaris, Agrostis vinealis, Deschampsia cespitosa, Deschampsia flexuosa, Festuca ovina, Nardus stricta

U12 — High montane heath and snow bed, Upland dry heath

Salix herbacea-Racomitrium heterostichum snow-bed

Matches 1 species from the description above: Festuca ovina

Salix herbacea, Carex bigelowii, Juncus trifidus, Luzula spicata, Huperzia selago, Andreaea rupestris, Conostomum tetragonum, Pohlia nutans, Dicranum scoparium, Kiaeria starkei, Racomitrium fasciculare, Racomitrium heterostichum, Racomitrium lanuginosum, Oligotrichum hercynicum, Polytrichastrum alpinum, Polytrichastrum sexangulare, Polytrichum piliferum, Barbilophozia floerkei, Diplophyllum albicans, Gymnomitrion concinnatum, Gymnomitrion corallioides, Lophozia sudetica, Marsupella brevissima, Nardia scalaris, Cetraria delisei, Cetraria islandica, Cladonia bellidiflora, Cladonia coccifera, Cladonia gracilis, Cladonia pyxidata, Cladonia uncialis, Cornicularia aculeata, Ochrolechia frigida, Gnaphalium supinum, Silene acaulis, Alchemilla alpina, Galium saxatile, Agrostis canina, Deschampsia cespitosa, Deschampsia flexuosa, Festuca ovina, Nardus stricta

U13 — High montane heath and snow bed, Upland dry heath

Deschampsia cespitosa-Galium saxatile grassland

Matches 1 species from the description above: Festuca ovina

Vaccinium myrtillus, Salix herbacea, Carex bigelowii, Carex pilulifera, Luzula multiflora, Luzula sylvatica, Diphasiastrum alpinum, Huperzia selago, Selaginella selaginoides, Pohlia nutans, Kiaeria starkei, Racomitrium lanuginosum, Hylocomium splendens, Hypnum callichroum, Hypnum cupressiforme, Plagiothecium undulatum, Pleurozium schreberi, Rhytidiadelphus loreus, Rhytidiadelphus squarrosus, Rhytidiadelphus triquetrus, Sanionia uncinata, Polytrichastrum alpinum, Polytrichum commune, Sphagnum capillifolium, Sphagnum russowii, Anastrepta orcadensis, Barbilophozia floerkei, Barbilophozia lycopodioides, Nardia scalaris, Ptilidium ciliare, Cetraria islandica, Cladonia gracilis, Peltigera canina, Achillea millefolium, Gnaphalium supinum, Saussurea alpina, Campanula rotundifolia, Cerastium alpinum, Cerastium fontanum, Minuartia sedoides, Silene acaulis, Vaccinium vitis-idaea, Thymus praecox, Euphrasia frigida, Oxalis acetosella, Armeria maritima, Polygonum viviparum, Rumex acetosa, Ranunculus acris, Alchemilla alpina, Alchemilla filicaulis, Alchemilla glabra, Potentilla erecta, Sibbaldia procumbens, Galium saxatile, Saxifraga hypnoides, Saxifraga stellaris, Viola palustris, Viola riviniana, Agrostis canina, Agrostis capillaris, Anthoxanthum odoratum, Deschampsia cespitosa, Deschampsia flexuosa, Festuca ovina, Festuca rubra, Nardus stricta, Blechnum spicant, Dryopteris dilatata

U7 — High montane heath and snow bed

Nardus stricta-Carex bigelowii grass-heath

Matches 1 species from the description above: Festuca ovina

Empetrum nigrum, Calluna vulgaris, Vaccinium myrtillus, Vaccinium uliginosum, Salix herbacea, Carex bigelowii, Carex nigra, Carex panicea, Carex pilulifera, Eriophorum vaginatum, Trichophorum cespitosum, Juncus squarrosus, Juncus trifidus, Luzula multiflora, Luzula sylvatica, Diphasiastrum alpinum, Huperzia selago, Campylopus flexuosus, Dicranum fuscescens, Dicranum scoparium, Kiaeria starkei, Racomitrium lanuginosum, Hylocomium splendens, Hypnum cupressiforme, Plagiothecium undulatum, Pleurozium schreberi, Rhytidiadelphus loreus, Rhytidiadelphus squarrosus, Polytrichastrum alpinum, Polytrichum commune, Polytrichum juniperinum, Polytrichum piliferum, Polytrichum strictum, Sphagnum capillifolium, Anastrepta orcadensis, Anastrophyllum donianum, Barbilophozia floerkei, Barbilophozia hatcheri, Bazzania tricrenata, Diplophyllum albicans, Lophozia sudetica, Pleurozia purpurea, Ptilidium ciliare, Scapania gracilis, Scapania nemorea, Cetraria delisei, Cetraria islandica, Cladonia arbuscula, Cladonia bellidiflora, Cladonia coccifera, Cladonia gracilis, Cladonia impexa, Cladonia leucophaea, Cladonia pyxidata, Cladonia rangiferina, Cladonia tenuis, Cladonia uncialis, Gnaphalium supinum, Solidago virgaurea, Cornus suecica, Vaccinium vitis-idaea, Thymus praecox, Narthecium ossifragum, Rumex acetosa, Alchemilla alpina, Potentilla erecta, Galium saxatile, Viola palustris, Agrostis capillaris, Agrostis vinealis, Deschampsia cespitosa, Deschampsia flexuosa, Festuca ovina, Nardus stricta

U8 — High montane heath and snow bed

Carex bigelowii-Polytrichum alpinum sedge-heath

Matches 1 species from the description above: Festuca ovina

Vaccinium myrtillus, Salix herbacea, Carex bigelowii, Juncus trifidus, Luzula spicata, Huperzia selago, Pohlia nutans, Dicranum fuscescens, Dicranum scoparium, Racomitrium canescens sens.lat., Racomitrium fasciculare, Racomitrium lanuginosum, Hylocomium splendens, Pleurozium schreberi, Sanionia uncinata, Polytrichastrum alpinum, Sphagnum compactum, Ptilidium ciliare, Cetraria delisei, Cetraria islandica, Cladonia arbuscula, Cladonia bellidiflora, Cladonia coccifera, Cladonia floerkeana, Cladonia gracilis, Cladonia macrophylla, Cladonia pyxidata, Cladonia rangiferina, Cladonia squamosa, Cladonia uncialis, Cornicularia aculeata, Ochrolechia frigida, Galium saxatile, Saxifraga stellaris, Agrostis capillaris, Deschampsia cespitosa, Deschampsia flexuosa, Festuca ovina, Nardus stricta

U9 — High montane heath and snow bed

Juncus trifidus-Racomitrium lanuginosum rush-heath

Matches 1 species from the description above: Festuca ovina

Empetrum nigrum, Kalmia procumbens, Vaccinium myrtillus, Vaccinium uliginosum, Salix herbacea, Carex bigelowii, Carex pilulifera, Juncus trifidus, Luzula spicata, Diphasiastrum alpinum, Huperzia selago, Dicranum fuscescens, Racomitrium lanuginosum, Pleurozium schreberi, Polytrichastrum alpinum, Polytrichum piliferum, Barbilophozia floerkei, Diplophyllum albicans, Ptilidium ciliare, Cetraria delisei, Cetraria islandica, Cetraria nivalis, Cladonia arbuscula, Cladonia bellidiflora, Cladonia coccifera, Cladonia crispata, Cladonia gracilis, Cladonia pyxidata, Cladonia rangiferina, Cladonia uncialis, Cornicularia aculeata, Ochrolechia frigida, Sphaerophorus globosus, Stereocaulon vesuvianum, Thamnolia vermicularis, Silene acaulis, Vaccinium vitis-idaea, Armeria maritima, Polygonum viviparum, Alchemilla alpina, Galium saxatile, Agrostis capillaris, Deschampsia cespitosa, Deschampsia flexuosa, Festuca ovina, Nardus stricta, Nitella flexilis

U11 — High montane heath and snow bed, Lowland dry acid grassland, Upland dry heath

Polytrichum sexangulare-Kiaeria starkei snow-bed

Empetrum nigrum, Salix herbacea, Carex bigelowii, Juncus trifidus, Huperzia selago, Conostomum tetragonum, Pohlia drummondii, Pohlia ludwigii, Pohlia nutans, Dicranum fuscescens, Kiaeria falcata, Kiaeria starkei, Racomitrium canescens sens.lat., Racomitrium fasciculare, Racomitrium heterostichum, Racomitrium lanuginosum, Pleurozium schreberi, Rhytidiadelphus loreus, Oligotrichum hercynicum, Polytrichastrum alpinum, Polytrichastrum sexangulare, Anthelia juratzkana, Barbilophozia floerkei, Lophozia sudetica, Marsupella emarginata, Moerckia blyttii, Nardia scalaris, Pleurocladula albescens, Cetraria islandica, Cladonia bellidiflora, Cladonia pyxidata, Cladonia uncialis, Solorina crocea, Gnaphalium supinum, Cerastium cerastoides, Silene acaulis, Alchemilla alpina, Sibbaldia procumbens, Galium saxatile, Saxifraga stellaris, Viola palustris, Agrostis capillaris, Deschampsia cespitosa, Deschampsia flexuosa, Festuca vivipara, Nardus stricta, Cryptogramma crispa, Blechnum spicant, Athyrium distentifolium

Insects to look out for

These moths and butterflies are known to feed on plants recorded at this site, and carry a notable UK conservation status — but a host-plant being present doesn't mean the insect has actually been recorded here. Treat this as "worth watching for," not a confirmed sighting.

SpeciesStatusVia host-plant
Black-veined moth
Siona lineata		 Critically Endangered Centaurea nigra
Straw belle
Aspitates gilvaria		 Endangered Linum catharticum
Marsh fritillary
Euphydryas aurinia		 Vulnerable Scabiosa columbaria
Satyr pug
Eupithecia satyrata		 Vulnerable Centaurea spp.
Grayling
Hipparchia semele		 Vulnerable Festuca ovina
Small heath
Coenonympha pamphilus		 Near Threatened Cynosurus cristatus, Festuca spp.
Autumnal rustic
Eugnorisma glareosa		 Near Threatened Festuca ovina
Grey pug
Eupithecia subfuscata		 Near Threatened Centaurea spp.
Silver-spotted skipper
Hesperia comma		 Near Threatened Festuca ovina
Scarce forester
Jordanita globulariae		 Near Threatened Centaurea nigra
Rosy minor
Litoligia literosa		 Near Threatened Festuca ovina

Hostplant data: Cook et al. (2025), Traits data for the butterflies and macro-moths of Great Britain and Ireland, 2024, UK Centre for Ecology & Hydrology / Butterfly Conservation (Open Government Licence). Contains data supplied by UK Centre for Ecology & Hydrology.