Mining has played a significant role in shaping Dartmoor over the centuries. From tin streaming to granite quarrying, the region’s diverse mining heritage reveals the ingenuity and resilience of those who sought to extract its valuable resources.
Tin Mining
Tin mining is one of Dartmoor’s oldest industries, with evidence of activity dating back to the Bronze Age. Early miners extracted tin from stream beds in a process known as “tin streaming,” where alluvial tin deposits were washed out of the moor’s river gravels. Over time, as surface deposits dwindled, miners turned to deeper lodes, digging pits and shafts to extract the metal.
By the medieval period, tin mining on Dartmoor was highly organised, with miners operating under the unique legal framework of the Stannary Laws. Tavistock, Ashburton, Plympton and Chagford became important stannary towns where tin was weighed, taxed, and stamped. Tin’s importance lay in its use for making bronze (when alloyed with copper) and for pewter goods. However, by the 18th and 19th centuries, tin mining on Dartmoor had declined as richer deposits elsewhere, particularly in Cornwall, drew investment away from the moor.
Copper Mining
Copper mining became a major industry on Dartmoor during the 18th and 19th centuries, with mines like Wheal Friendship and Wheal Betsy at the forefront. Wheal Friendship, near Mary Tavy, was one of the most successful copper mines in the region. Operating from the early 18th century, it was transformed by the involvement of John Taylor, a pioneering mining engineer. Taylor’s innovations, including the construction of the Reddaford Leat and the installation of a large steam engine, enabled the mine to overcome persistent flooding and reach greater depths.
Wheal Betsy, also near Mary Tavy, focused on silver-lead production but produced copper as a secondary resource. The demand for copper, driven by the Industrial Revolution, brought significant wealth and employment to the region, leading to population growth in the mining villages.
Silver and Lead
Wheal Betsy was notable for its production of silver and lead, both valuable resources during the mine’s peak in the 18th and 19th centuries. Silver was prized for coinage and jewellery, while lead was essential for construction, including pipes, roofing, and paints. However, Wheal Betsy often struggled with financial difficulties due to its remote location and flooding issues. Despite these challenges, the mine’s impact on the local economy and its architectural legacy endure.
Arsenic Mining
By the late 19th century, as copper and tin deposits became harder to access, Dartmoor’s miners turned to arsenic production. Arsenic, used in agricultural pesticides and industrial processes, became a significant export from Dartmoor. Wheal Friendship and other mines adapted their infrastructure to extract and refine this toxic material. The remains of calciner buildings, where arsenic ore was roasted to produce arsenic oxide, can still be seen in the landscape.
The dangers of arsenic mining were considerable, with workers exposed to toxic fumes and dust. Despite this, arsenic production provided a vital source of income for local communities as other mining industries declined. Dartmoor’s arsenic mines played a key role in meeting the global demand for this material until alternative chemicals became more widely available in the 20th century.
Granite
Granite quarrying was another major industry on Dartmoor, with Foggintor and Haytor quarries being the most prominent sites. Foggintor Quarry, near Princetown, supplied high-quality granite for iconic projects such as London Bridge and Nelson’s Column. Opened in the early 19th century, the quarry relied on skilled workers to cut and shape the massive stone blocks. The granite was transported via the Dartmoor Granite Tramway, an impressive engineering feat that connected the quarry to the wider transport network.
Haytor Quarry, on the eastern edge of Dartmoor, also contributed to major construction projects, including the National Gallery in London. The Haytor Granite Tramway, built in 1820, used granite rails to facilitate the movement of stone to the Stover Canal. Both quarries supported small but thriving communities of workers and their families.
Leats
The success of mining and quarrying on Dartmoor depended heavily on water management. Leats (man-made watercourses) were essential for supplying water to power machinery, wash ore, and support processing operations. The Reddaford Leat, constructed for Wheal Friendship, is one of the most well-known examples. Stretching for miles across the moor, leats redirected water from rivers and streams to mining and quarrying sites.
These leats not only transformed the landscape but also influenced the development of settlements around Dartmoor. Villages like Mary Tavy benefited from the water supply, which supported domestic use as well as industrial activity. Today, the remnants of these leats are an integral part of Dartmoor’s historical and ecological heritage.
The Reddaford Leat.
Copyright: Chris Wordingham
Impact on Population
Mining and quarrying brought significant changes to Dartmoor’s population. Villages such as Mary Tavy, Tavistock, and Princetown experienced rapid growth as workers and their families moved to the area in search of employment. The population of Mary Tavy, for example, grew from around 200 in the late 18th century to around 2,000 at its peak, driven by the success of mines like Wheal Friendship and Wheal Betsy.
These communities were shaped by the industries that sustained them. Workers’ cottages, chapels, schools, and shops sprang up to meet the needs of the growing population. However, the decline of mining and quarrying in the late 19th and early 20th centuries led to significant population loss as families were forced to move elsewhere for work. Despite this, the legacy of these industrial communities remains visible in the architecture and layout of Dartmoor’s villages.