A slagheap safari in Wales
The hills are alive with rare plants and bugs
Wales is ambivalent about its coal tips – part shared legacy,
part perceived threat. But scientists are finding rare species of insects,
plants and animals in these unloved, little-visited landscapes. Entomologist
Liam Olds took Karen Thomas on a guided tour
As you read this, many UK plants and animals will have
hunkered down for the winter. But somewhere on a derelict hillside deep in the
South Wales valleys, the Beast of Beddau is stirring in its lair.
It’s seven years since freelance entomologist Liam Olds and
his colleague Chris Lawrence found Cranogona dalensi mauriès
on Cwm Colliery’s coal tip outside Beddau in the Rhondda Valley. This tiny, off-white
millipede, native to the Pyrenees, is less than 6mm long and has seven or eight
lenses in its eyes. The sighting at Beddau was a UK first. Excited reports nicknamed it
the Beast of Beddau.
It joins the Maerdy Monster, which Olds and millipede expert
Christian Owen discovered in 2015 on another Rhondda coal tip. The 12mm
millipede Turdulisoma helenreadae was the first new arthropod named in
the UK in a generation. These finds led Olds to launch the Colliery Spoil
Biodiversity Initiative.
Olds is the grandson of a Rhondda collier who managed the ponies
below ground. As a child, Olds walked his dog on the local tip. “I’d see grass
snakes, common lizards and dragonflies – it felt like my own personal nature
reserve. It’s why I studied zoology at university.”
The Museum of Wales hired him as a Natural Talent
apprentice, specialising in colliery-spoil invertebrates. Olds spent three
years working with experts and citizen scientists to record plants, invertebrates
and larger wildlife on eight old tips in Rhondda Cynon Taf and seven in Neath
Port Talbot. Between 2015 and 2018, the surveys recorded 900 different species.
Just one Welsh spoil tip is designated a nature reserve. And
of Wales’ 2,500 legacy tips, Olds has surveyed just 20. He wants to map and
monitor all of the country’s tips to discover what lives there and to protect and
value these habitats as our climate changes and as more and more species risk
becoming extinct.
Summer
coal-tip safari
It’s a muggy late-summer afternoon. Storm Betty has been and
gone; torrential rain has turned the hills above Beddau a shimmering green. Olds
pulls in below a clump of brambles and we walk up a slope that would pass for a
regular Welsh hillside. But the hill is Cwm Colliery’s spoil tip – a vast heap of
debris ripped from the earth.
Cwm produced its first coal in 1914, expanding in the 1950s
to join up with Coed Ely colliery 5km away. At peak production in the 1970s, 1,500 men mined
half a million tonnes of steam coal a year. Having survived the mid-1980s
year-long miners’ strike, Cwm closed in 1986, taking 800 local jobs. The coke
works followed in 2002.
The legacy is scattered all around – twin chimneys rise from
the valley floor – but the place is deserted. The tip’s only visitors are quad
bikers and occasional dog walkers; local people mostly stay away. Undisturbed,
nature has reclaimed the nutrient-poor soils. “It’s an open mosaic of
habitats,” Olds says.
Soon, the grassland flattens into a plateau. The mosaic takes
shape: scrub, young and mature broadleaf woodland, boggy mud, waterbodies with
and without reed beds, calcium-rich springs and watercourses stained orange
with iron. Within
this multitude of microhabitats, rare plants, invertebrates and amphibians thrive.
“The geology and pH levels are really complicated,” Olds
explains. “You get this strange mix of acid, neutral and calcareous flora, all
co-existing in the same area.”
We traipse past common species: knapweed, wild carrot,
scarlet pimpernel, blackberries, oaks and silver birch. There are also rogue
invaders: cotoneaster bushes and trees, Himalayan balsam and pearly everlasting,
an Asian/North American daisy planted on miners’ graves.
Olds has found plants not seen since the 1960s on older areas
of the tip. “It’s ironic,” he says. “We’ve lost so many habitats around these
tips, but flora and fauna have colonised from those lost habitats. Parts of
these tips become time capsules.”
We pass an abandoned badger’s sett and the crushed corpse of
a mole. We spot a common frog hiding in the leaves. A huge black-and-gold
dragonfly clicks past at speed and a buzzard caws high above the trees.
An ornate-tailed digger wasp pops out of a hole in search of
lunch, scouring the earthen bank for beetles. Clumps of kidney vetch feed the
caterpillars of rare small blue butterflies. Dingy skipper caterpillars feast
on birdsfoot trefoil.
Because coal tips are mostly hot and dry, they draw species native
to sand dunes. Olds has recorded slow worms and adders, brown-banded carder
bees and water rails. He’s seen a thick-margined mini mining bee thought to
have vanished from Wales in the 1960s.
The UK is one of the most nature-depleted countries in the
world; climate change, industrial farming and pollution are pushing more
species to breaking point. The
State of Nature report published this autumn found that one in six UK
plants, mammals, insects, birds and amphibians is facing extinction. Against
the odds, nature clings on in old spoil tips.
Surveys have recorded 100 bee species on Welsh tips, 60
species of lichen and 100 different mosses, many of them rare. New finds come
thick and fast. Near Tower Colliery, 35km, fungi experts found Cudoniella
tenuispora – thought to be extinct in Wales – growing out of pine cones. Another
tip has ballerina waxcaps – fungi seen only on centuries-old pasture.
Coal
tips’ troubled past
The way in which these sites have flourished undisturbed says
a lot about Wales’ troubled relationship with its coal tips. In 1966, spoil collapsed
onto a school at Aberfan near Merthyr Tydfil, killing 28 adults and 116
children. The disaster remains an open wound in Wales.
In 2020, Storm Dennis tore through South Wales, bringing torrential
rain that saturated and weakened a spoil tip near Tylorstown. It caused a 60,000
cu m landslide that blocked the valley and damaged sewers and a strategic water
main.
Thankfully, no one was hurt, but public outrage pushed the Welsh government
to review safety at all 2,456 tips to determine whether climate-linked storms,
floods and droughts are destabilising them, and review the current legislation relating
to disused coal tips.
The Law Commission concluded that the laws and regulations around
the management of spoil tips are “no longer fit for purpose”. The
safety review found that 300 tips are high risk, but the Welsh government has
declined to name them. The Senedd is to discuss the Coal Tip Safety Wales
Bill, to replace the 1969 Mines and Quarries (Tips) Act, in the new year.
Olds and his fellow scientists counter that this leaves 2,000
tips that pose little to no risk and that – with a nature-loss emergency that’s
every bit as urgent as the climate crisis – we must value and protect these
sites as precious habitats that could be damaged by work to repair them.
However, until we know which plants and animals live in our
spoil tips, it’s impossible to set priorities to protect and conserve them. Several
other countries – notably Poland and Germany – have conducted considerably more
research to determine which species live on old spoil tips.
“Almost all these sites have really high biodiversity value
– locally, at county level and often nationally too,” Olds says. “We’re talking
about species designated a conservation priority in Wales and the UK. That’s
incredibly important, but we’ve only looked at a really small proportion of
these sites.
“If just 10 per cent of these sites have really high
biodiversity value, that’s 250 sites whose quality may be better than most
nature reserves. I honestly do believe that. That’s a massive resource for
Wales. If we’re serious about tackling the biodiversity crisis, we need to look
after landscapes that harbour nature. And in the South Wales Valleys that means
our coal tips.”
That work needs funding and resources, but it also needs a new
mindset – for the public to see tips as places of wonder not threat, and to
value these spaces for wildlife without putting new pressures on plants and
animals that have thrived undisturbed.
It’s a tricky balance – budgets are tight and local
authorities need to build new homes. In July, Rhondda Cynon Taf Borough Council
agreed an £8 million funding package to tear down Cwm Coking Works to build 600
new homes. Nature comes low on the list of priorities.
“It’s unrealistic to think we’ll protect all of these sites
from all of the pressures they face, whether from development and land
reclamation or public safety,” Olds says. “There are new pressures from solar
farms – fitting panels across sites is no good for species that need open
ground. But we could at least protect the most biodiverse sites – perhaps one
in every county.”
Mapping which species live on which sites would be a start. “It’s
their complexity that makes these sites interesting,” Olds concludes. “Each is
very different. You can’t know what to expect. They’ve all been left to
revegetate.
“Rewilding is popular now – but it’s already happened here,
across the South Wales coalfield. It shows the power of nature. All these rare
species prove that nature can thrive – if we let it.”
Find
out more: www.collieryspoil.com
This story is published in the November 2023 issue of The Environment magazine