I was interested to see this on a map, where exactly it is etc.:

BTW the “Szczerców field” mentioned in the article is labeled “Pole Szczerców” on the map.

The huge mine complex stretches to around 8.5 kilometers in length, with its size so vast it has been visible via satellite imagery. At its peak, huge holes in the earth plunged as deep as 310 meters.

That’s deep.

Also: Bagger!