Why Cornwall Had Tin in the First Place

Cornwall's tin begins with its geology. Around 280 million years ago, molten granite pushed up into the surrounding sedimentary rocks, and the heat and mineral-rich fluids that came with it left metal-bearing veins — lodes — running roughly east to west through the county. The most important of these carried cassiterite, or tin oxide, a heavy dark mineral that weathers out of the rock and settles in stream beds.

That single fact explains a great deal about Cornish history. Tin was being worked here long before the Romans arrived, and by the medieval period the industry was important enough to be governed by its own rules. The stannaries — from the Cornish sten, meaning tin — were a distinct legal district with their own courts and customs. Tinners held privileges that other workers did not, including exemption from some taxes and the right to search for tin on certain commons. Tin was taxed as coinage, stamped and weighed at designated towns.

It is worth remembering that the earliest mining was not underground at all. Tinners worked streamworks, shovelling gravel from valley floors and washing it in wooden troughs and buddles to let the heavy tin settle out. You can still spot the scars: oddly level valley bottoms and hummocky waste heaps, often now softened by gorse and willow scrub.

From Streamworks to Shafts

By the sixteenth century, surface gravels were running thin and attention turned to the lodes themselves. At first miners simply followed a vein down a hillside in open trenches. Soon they were underground, and that created the problem that shaped Cornish mining for three hundred years: water.

Early workings were drained by adits — gently sloping tunnels driven into a hillside to let water run out by gravity. Where that was not possible, miners used rag-and-chain pumps, then horse-driven whims, then water wheels. In the eighteenth century atmospheric engines arrived, and from the early nineteenth century the Cornish became genuinely brilliant at steam.

The result was the Cornish beam engine: a compact, hugely efficient pumping engine that could lift water from great depths using far less coal than its rivals. Cornish engineers exported the design around the world, and the engine houses that sheltered these machines are now the county's most familiar silhouette.

The Age of the Deep Mines

The boom years ran roughly from the 1830s to the 1870s, concentrated in the Camborne and Redruth district and around St Just, St Agnes and Callington. Shafts went deeper and deeper — some passing 3,000 feet, well over 900 metres. Below ground you would find a maze of levels, stopes and shafts; above it, winding engines, stamps that crushed ore to sand, dressing floors where the tin was separated, and towering calciner stacks with long flues snaking up the hillside.

At its peak in the early 1870s, Cornwall was producing a large share of the world's tin. The work was varied and often done by whole families:

• Tutworkers on contract, paid by the fathom of ground driven.
• Bal maidens — women and girls who broke, sorted and dressed ore at surface, sometimes numbering in the hundreds at a single mine.
• Shaft hands, timber men, smiths, engine drivers and carpenters keeping the whole operation upright.

Then it turned. From the 1870s, cheap tin from Malaya, Australia and Bolivia flooded the market, while copper mining in Cornwall collapsed even earlier. Mines closed, wages fell, and thousands emigrated, carrying their skills to South Africa, Australia and the Americas. The men who left became known, affectionately, as Cousin Jacks.

Life in a Mining Community

Mining shaped Cornish towns as much as it shaped the ground. Villages grew as tight rows of granite and cob cottages, usually within walking distance of a shaft, because getting to work meant walking. Nonconformist chapels, reading rooms and miners' institutes were central to community life, and self-improvement through education and music was taken seriously.

Households rarely relied on one wage. A miner might keep a smallholding, or a patch of land with a pig and some potatoes — the Cornish acre — to see the family through a downturn. Accidents, dust and poverty were constant companions, and the memory of them sits in the war memorials, the chapel graveyards and the rugby clubs alike.

Reading the Landscape Today

Once you know what you are looking at, the Cornish landscape becomes a document. Engine houses perch on cliffs and hilltops; calciner stacks stand in fields; leats and adits trace the hillsides; strangely bare, gorse-covered burrows of spoil lie where nothing has grown back. Cornwall's mining heritage has been recognised internationally, and several trails and heritage sites explain the story on the ground.

A few practical tips for exploring:

• Wear sturdy boots — spoil tips are loose, steep and unforgiving.
• Never enter mine shafts, adits or buildings; they are unstable and often open to deep drops.
• Keep to footpaths, especially on clifftop sites where the rock is undermined.
• Visit a preserved engine house or mining museum first, then notice the same features elsewhere.

Traditional Crafts That Grew Alongside Mining

An industry that deep and that long left a legacy of practical skills. Granite working supplied engine beds, lintels and paving; the dressers' marks still show on old stones. Cornish hedges — stone-faced earth banks, not true hedges — were built and maintained by hand, and good hedgers are still in demand. Blacksmiths made and sharpened the drills and picks that went underground, while carpenters cut pit timber and boat builders served the ports that shipped ore out.

Around the mines you also find knitting of ganseys, net making and rope work, and the pewter and tin smithing that turned local metal into everyday objects. Many of these crafts survive through small workshops, guilds and adult education classes, and there is no quicker way to understand Cornish mining than to try one. Hammer a piece of tin, build a few metres of hedge, and the labour behind the engine houses suddenly makes sense.