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Graukaue (Gray Coe) is a podcast studio at the Fürst Leopold Coal Mine in Hervest-Dorsten.

The owner is Michael Holtkamp.


The pits. There's Graukaue 2 and Graukaue 1.

Graukaue 2

This is the English-language pit.

Underground with Michael Holtkamp

Under the roof of the Gray Coe there are countless microphones, with each microphone being suspended from the ceiling just like a clothes hook. At the beginning of a shift, each miner lowers his microphone, like the announcer in a boxing ring did in the past. When the bell rings three times, the crew goes down into the mine. Glückauf!

Graukaue 1

This is the German-language pit; see

Audio podcasts

All shows' audio versions are available at You can subscribe to the podcasts via their feeds as well as on the platforms listed below.

Podcast feeds
Listen on Apple Podcasts
Apple Podcasts

Apple Podcasts

Listen on YouTube Music
YouTube Music

YouTube Music

Video podcasts

All shows' video versions are available on Graukaue's YouTube channel at You can subscribe to the channel as well as to the podcasts.


The log. This is where I document the advances at Graukaue 2.

See also the log of Graukaue 1.


The pitmen. These are the miners' dog tags.


The bell system. This is how I communicate with the outside world.

Pay envelope

The butty system. This is how you facilitate advances.


The coal face. This is where the mining takes place.


The Fürst Leopold Coal Mine. Graukaue is located at this abandoned coal mining plant in the North of the Ruhr in Germany.


The location in Dorsten. The mine is located north of the river Lippe, in a part of town called Hervest.


The location at the mine. Graukaue is located in the 'Lohnhalle'.


The hammer and the pick. These is the technical equipment.


The mining. This is how I record.


Combined mines

Vereinte Volksbank
Vereinte Volksbank

Vereinte Volksbank

CreativRevier Heinrich Robert in Hamm
CreativRevier Heinrich Robert in Hamm

CreativRevier Heinrich Robert in Hamm



Dorsten Online
Dorsten Online

Dorsten Online

Graukaue (Logo)