Turkey: 2,300 years old olive oil factory discovered in Milas
When archaeologists uncover an ancient olive-oil works — as they have at Milas in south-west Turkey — the striking thing is how familiar it looks. The presses, the settling vats, the storage jars: the machinery of oil has barely changed in two thousand years, and that continuity is a story worth telling.
Every few years a dig somewhere around the Mediterranean turns up another ancient olive-oil installation — a cluster of stone press-beds, a scatter of great storage jars, the tell-tale channels cut to run oil into settling tanks. A find at Milas, in the old region of Caria in south-west Turkey, is a good example, dated to roughly two and a half thousand years ago. What makes these discoveries quietly thrilling is not that they are strange, but that they are recognisable: the ancient oil-maker was solving exactly the problems a modern miller solves.
Oil as ancient wealth
To understand why a two-thousand-year-old factory turns up so often, you have to grasp how central olive oil was to the ancient economy. It lit lamps, cleaned and anointed bodies at the baths, fuelled ritual and medicine, and above all it was a tradable, storable form of wealth. Great estates pressed far more than they could eat and shipped the surplus across the sea in standardised clay amphorae — the shipping containers of antiquity. A working oil press was infrastructure, and a rich tomb near one, as at Milas, is no surprise: oil made fortunes.
How ancient oil was actually made
The ancient method and the traditional stone mill are essentially the same machine. Olives were crushed — often under a rolling stone in a basin, the trapetum the Romans refined — then the pulp was pressed, using either a massive lever weighted with stones or a screw press, both of which archaeologists find as cut stone anchors and weights. The liquid ran along channels into settling vats where the oil floated free of the watery lees and was skimmed. It is the very process a preserved mill shows, and its logic survives in today’s mechanical extraction.
What the ruins tell us
These sites are more than curiosities; they are evidence. The number and size of presses reveal how much oil a region produced and whether it was for local use or export. Amphora stamps trace trade routes across the whole sea. The placement of vats and channels shows a sophisticated grasp of the one principle that still governs oil-making: that oil and water separate, and time and gravity will do half your work. Standing over a 2,300-year-old press-bed, you are looking at the direct ancestor of the stainless-steel plant that filled your last bottle — the same idea, patiently improved.
| Era | Crushing | Pressing | Storage |
|---|---|---|---|
| Ancient (Milas-era) | Rolling stone in a basin | Lever or screw, stone weights | Clay amphorae, buried jars |
| Traditional mill | Great stone wheel | Fibre mats under a screw | Glazed jars, barrels |
| Modern plant | Steel hammer crusher | Enclosed centrifuge | Inert stainless-steel tanks |
| The constant | Crush the whole fruit | Squeeze out oil + water | Keep air and light away |
Reading an ancient oil site, plainly
- The press weights and stone beds are the giveaway — the heart of any ancient mill.
- Amphorae mean trade: oil made to travel, not just to eat.
- The scale of the presses hints at local use vs export.
- The settling vats show the same oil-floats-on-water logic used today.
- It is the direct ancestor of the modern mill — same idea, better tools.
Ancient olive oil: common questions
How old is the oldest olive-oil making?
Olive-oil production goes back thousands of years across the eastern Mediterranean. Finds like the Milas press, around 2,300 years old, are common because oil was central to ancient life.
How did ancient people press olives?
They crushed the fruit under a rolling stone, then squeezed the pulp with a lever or screw press and let the oil settle and float free of the water in vats — the same principle as later stone mills.
Why was olive oil so important in antiquity?
It was food, lamp fuel, soap, medicine and ritual material, and a storable, tradable form of wealth shipped across the sea in amphorae.
What are amphorae and why do they matter?
Standardised clay jars used to store and ship oil and wine. Their shapes and stamps let archaeologists trace ancient trade routes and production centres.
Is ancient oil-making really like modern methods?
In principle, yes. Crush the whole fruit, press out the oil and water, separate the two — modern centrifuges do it faster and cleaner, but the logic is unchanged.
What always strikes me about these ancient finds is not how primitive they are but how modern. A 2,300-year-old press bed is doing exactly what my old mill did and what a steel plant does now : crush the whole fruit, squeeze out the oil and water, and let oil float free to be skimmed. Two millennia of refinement, one unchanged idea. Next time you read ‘first cold press’ on a bottle, remember you are buying a technology older than most of recorded history.
Drawn from Mediterranean olive-oil archaeology: press remains, amphora evidence and traditional milling practice.