Upper Dinas Silica Mine – 3rd January 2022

Barry Burn
Andrew ‘Zeb’ Zerbino
Xavier Zerbino

This was to be my first trip underground in a very long time. This time last year, we had missed a lot of caving due to COVID restrictions and I was looking forward to the prospect of caving again in the New Year. I was unaware that in just three days time, I would be looking at a positive test result followed by several weeks in intensive care and a further few weeks on a renal ward before finally coming home in the latter part of March. It’s been a long haul since then and had taken me a long time to recover enough fitness to even think about getting underground again. I was now thinking that a nice easy trip would be achievable and Upper Dinas Silica mine with its large galleries and no crawling with minimal scrambling would fit the bill. Previously, access to the mine has been via either the very steep path up the rock from the car park or by following the river upstream and climbing up the waterfalls. Now though, an old right of way has been re-opened due to the efforts of Roy Fellowes, the owner of the mine and I thought this would be an easy way up.

The Monday was a bank holiday and Zeb and Xavier had said they fancied a trip and I picked them up at a nice reasonable time of about lunchtime and we managed to make reasonable time through the roadworks to the car park at Dinas Rock.

Dinas Rock is an imposing place and legend tells that this is the resting place of King Arthur and his Knights. It is also said that there are many fairies here and in British Goblins, Wirt Sykes wrote of the place’s bad reputation. More recently, the area has seen extensive mining for silica that was used for the production of fire bricks that were used extensively in the steel making industry throughout the world. Now, mining has ceased and the area is more likely to be infested with cavers, climbers and walkers.

There are a number of caves and mines here and we were to visit the largest, Upper Dinas Silica mine. The re-opened way to the mine is to come out of the car park and follow the road over the bridge and up a hill past some glamping pods on the right until a clear path is found leading off to the left. The path is well kept although muddy in places and takes you to the top of the gorge where some old structures that used to support the pylons for the aerial ropeway are to be found. The path takes you down a steep slope that ends at the bridge on the other side of the river from Upper Dinas by the entrance to the smaller mine opposite, Middle Dinas Silica Mine.

Base of Aerial Ropeway Pylon

Middle Dinas consists of three levels, the lower of which floods, the level of which depends on the river level outside. On previous visits, there has been a large, deep pool in the main passage but this time it was more or less dry and we were able to have a good look around. Zeb climbed an ascending passage that goes up to another passage and a higher entrance. After a look around, we crossed exited and crossed the bridge to enter Upper Dinas itself.

Looking out from Middle Dinas Silica Mine
Climbing Ascending Passage
Way Down to Lower Level

Upper Dinas is a massive, impressive place with the upper, unflooded section being effectively a massive chamber on a steep incline, interspersed with many pillars that support the roof.

Looking Back Towards Entrance

We did the usual thing which is to follow the big level just up from the flooded levels until near the end then drop down and continue to reach the furthest point east in the mine to find there had been some other idiots there before us.

Graffiti at Far End Of Mine

Retracing our steps, we climbed up to the remains of the winch which has a large ventilation shaft that slopes upwards to the side of the winch. Zeb went off to explore whilst Xavier and I were more sensible and hung around below taking photos until Zeb returned with a tuft of grass to prove he’d found the the exit to the surface above.

Xavier Posing with Winch
Ventilation Shaft

Heading back towards the entrance, we gradually climbed upwards as we went by climbing up a level, following on for a way and then climbing back up again. This way we made it to the top entrances and emerged into the open. A short scramble then to the path that took us back down to the car park.
It was great to get out and get underground again. It showed me that I still have a way to go as I found some of the scrambling and hills difficult. With time and effort though, I am confident that I will be able to get some way back to where I was before COVID. However, for my first trip back, I was thoroughly knackered but very chuffed to be back.


Surveys of the mines can be found in Caves and Mines of The Sychryd Gorge.

Information on access to this mine and others can be found at the website of Cambrian Mines

The Cambrian Mines site contains a lot of interesting information such as the History of Mining and links to a collection of historical photos from when it was a working mine.

Upper Dinas Silica Mine, 1st May 2016 by Barry Burn

Barry Burn
Tristan Burn
Tom Williams
Vicky Blüemel
Andrew “Zeb” Zerbino

After leaving the delightful Will’s Hole behind us, we decided to go back to the cars via the Upper Silica Mine that can be reached by following the river upstream until an obvious mine entrance is found up a banking and behind a low fence.

We entered via the lower entrance and had a quick look around the lower levels where you can walk to the far end of the mine with steep inclines to your left that lead to higher parallel galleries and lower flooded levels to your right.


Looking back to the lower entrance

And we explored some of the lower levels of the mine.


Tris decided to have a look at one of the flooded levels.



And we threatened Zeb with what might happen the next time he’s late.


Late again and we remove the chocks…

A detour to the crane and then back out by climbing the slope up to an upper entrance at the top of the hill.

It is quite amazing when you pop out the top of the hill to realise that the whole interior of the hill has been hollowed out by mining activity.

A walk back down off the rock back to the cars followed completed an enjoyable double-trip day.


Back Down The Rock