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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, and I'm the coe's custodian (Kauenwärter).


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

Graukaue 1

This is the German-language show; see

Graukaue 2

This is the English-language show.

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!


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

See also the episodes of Graukaue 1.

Butty gang

The butty gang. These are the miners' dog tags.


The bell system. How I communicate with the outside world.

Pay packet

The butty system. How you facilitate advances.



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. Graukaue is located in the 'Lohnhalle'.

Technical equipment

The hammer and the pick. These are the working tools.

Recordings with guests

The colaboration with amateurs. This is how I go about recording with guests.



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)