Idrija Mercury Mine: Anthony's Main Road, the Smelting Plant and the Town's Mining Sites

What the Idrija mercury mine is and why it is on the UNESCO list

Mercury was found in the Idrija basin in 1490, and a rich cinnabar deposit struck on 22 June 1508 set off five centuries of continuous mining under the town. Tunnels eventually ran for hundreds of kilometers beneath the streets. The mercury heritage of Idrija and Almadén was inscribed on the UNESCO World Heritage List in 2012.

That heritage is spread across the town rather than fenced into one site: the mine storage house, the miners' theatre, the Lace School and the Town Hall ring the old squares, with the administrative castle above them. Reading the town as a single mining landscape is what makes a visit here different from a cave tour.

Anthony's Main Road: what the guided underground tour shows

Anthony's Main Road (Antonijev rov) is the oldest part of the mine, entered through the Šelštev building at Kosovelova street 3 in the town center. A guide leads you into the tunnel miners used for nearly five centuries; the tourist section splits between hand methods — manual excavation, loading and hauling ore in carts — and machine drilling, blasting and loading.

The draw is the setting rather than a theme-park ride, and native mercury is one of the features the route shows. Because the tour is guided, you move at the group's pace. Treat the underground leg as the anchor of your day and build the above-ground stops around the slot you book.

The Hg smelting plant and the VR rotary furnace experience

The Hg smelting plant is ticketed separately from the mine, and it is where the ore was processed rather than dug. The VR experience of a rotary furnace is sold alongside the plant as its own item. If you only have time for one, the mine gives you the tunnel and the plant gives you the surface story of how mercury was extracted.

The Compressor Station is a third, cheaper stop in the same heritage group, useful when you want one more technical site without another long tour. None of the three are far apart, so the practical question is how many guided slots you want to sit through, not how much ground you cover.

Standalone versus combined tickets: what each option covers

The price list sells a combined Idrija Mercury Mine ticket covering Anthony's Main Road plus the Hg Smelting Plant, and also sells each site on its own. Because the combined adult price is lower than the two single tickets added together, it saves money when you want both; the VR furnace ride and the Compressor Station are priced apart from all of it.

For a couple the arithmetic is simple: two adult single tickets versus one combined ticket each. For a family, the combined family ticket covers two adults and two children aged 6 to 15, with a small charge for each additional child. The price list also mentions package deals across multiple Idrija experiences, so ask at the ticket desk before you buy piecemeal.

Prices by season for the mine, Anthony's Main Road and the smelting plant

Combined mine tickets run on three seasonal brackets. In November through March an adult pays 17.00 EUR, pensioners and students 14.00 EUR, children 6 to 15 7.00 EUR, children 3 to 5 3.00 EUR and a family 42.00 EUR. April, May, June, September and October move to 20.00 EUR adult and 46.00 EUR family, while July and August reach 22.00 EUR adult and 50.00 EUR family.

Bought alone, Anthony's Main Road is 15.00 EUR adult, 12.00 EUR for pensioners and students, 7.00 EUR for children 6 to 15, 2.00 EUR for children 3 to 5 and 36.00 EUR for a family. The Hg Smelting Plant alone is 10.00 EUR adult, 8.00 EUR for pensioners and students, 5.00 EUR for children 6 to 15, 2.00 EUR up to age 5 and 24.00 EUR for a family, with the VR furnace ride at 5.00 EUR adult and 3.00 EUR for children 6 to 15.

The Compressor Station is the cheapest stop at 3.00 EUR for adults and pensioners, 1.50 EUR for children 6 to 15 and students, with under-6s at no charge. Summer is the priciest window, so if your dates are flexible and you want the underground tour, late spring or early autumn saves a few euros per adult.

How long to allow: the 1.5 km town trail and its one-hour walking time

The town trail linking the mining sites starts at the TIC Idrija visitor center and covers 1.5 km with 36 m of elevation gain, rated easy and marked with blazes. The stated walking time is one hour, and that excludes museum visits. Add the underground tour, the smelting plant and a castle stop and you are looking at most of a day.

The route is gentle enough for ordinary shoes, but the climb past the old primary school to the Church of the Holy Trinity is the sharp bit. If you are short on time, cut the trail and walk straight between the mine entrance and the castle.

Gewerkenegg Castle, the Municipal Museum and the lace collection

Gewerkenegg Castle was the mine's administrative building and mercury store, and today it holds the Idrija Municipal Museum, where the town's 500-year mining story and its handmade bobbin lace are exhibited together. For the lace side in more depth, the Idrija Lace guide is a natural companion. The castle is the natural midpoint of the town trail, between St Ahacius Square and Scopoli Square.

The lace story is not a side room: the Lace School on the Town Square is described as the oldest continuously operating lace school in the world, and the museum's lace collection sits beside the mining material. If lace interests you more than tunnels, the castle is the stop to prioritize.

The Miner's House, Francis' Shaft and the Kley's pump

The Miner's House is set up as a museum showing how an Idrija mining family lived — modest rooms, not a grand villa. Next to it, in the Francis Shaft building, a collection of mining machinery includes the restored Kley's pump of 1893, described as the largest preserved steam engine in Slovenia and Europe. The Municipal Museum's mining collection holds the broader version, with hundreds of objects from pit lamps to ore carts.

The collection's headline object is the Kamšt, a 1790 mining water pump with a wooden drive wheel 13.6 m in diameter. It is a reminder that the mine was a machine complex, not just tunnels, and it belongs on the town walk rather than underground.

Kamšt and the Rudarska Street prhauz buildings in Brusovše

Across the Idrijca River, the Brusovše quarter holds Rudarska Street, lined with the apartment blocks called prhauz that housed miners' families. It is the plainest part of the mining heritage and the one that shows how the workforce lived away from the pithead. Pair it with the Kamšt and the Miner's House for the social side of the story rather than the engineering.

The river bank here is a good place to end a walking loop, since you are a short walk from the center and the mine entrance. With time left, the surrounding countryside continues the story, from the Zgornja Idrijca landscape park to the Divje jezero spring near town.

How to reach Anthony's Main Road and where the tour starts

The underground tour begins at Kosovelova street 3 in central Idrija, entering through the Šelštev building. The center is compact enough to walk from the main square to the mine entrance in a few minutes, so parking at the edge of the center beats hunting for a space by the pithead.

The tour runs on a guided schedule, so check the current slot at the TIC Idrija visitor center or ticket desk before you lock in the rest of the day, and confirm the meeting point there.

What to wear and expect underground

You are walking through old mine galleries, so the ground is uneven and the route is lit but not bright. Bring sturdy shoes and an extra layer, because the underground section is a different environment from the sunny squares above.

Leave behind bags you cannot carry comfortably, since the tour is on foot and narrow in places. Plan the underground visit before the steep climb to the Church of the Holy Trinity rather than after it.

Which Idrija ticket should you buy?

If you want the underground experience, buy Anthony's Main Road and add the smelting plant only if surface processing interests you. Families should compare the combined family ticket against the single-site family tickets before paying, since the gap is narrow in some seasons.

Either way, keep the one-hour town walk and a castle stop on the schedule; the mining landscape above ground is what makes the day. For the wider town, from the Lace School to the squares and the river, use the Idrija: A Visitor's Guide to the Mercury Mine, Lace and the Old Town as your planning base.