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This caught my attention when I was browsing the Leipzig area. I assume it means mining, but why did they do that?

http://m.osmtools.de/index.php?lon=12.344166129701&lat=51.245623906482&zoom=18

!Friendicatreffen 2018
These sign is made of bushes in the former miningarea. It's the sign of miners.
Miners have this sign on there cars too.
Image/photo
If the miners is retired, the hammerheads are shown down. Also former mines where marked hammerhead down.

The highway is created on mining land and expensiv as hell.
I thought it could be a warning for airplanes, but it doesn't make much sense, so I was wondering if there was any other specific goal for making such a sky-visible pattern.
You should now, it's the downwind approach for our airport LEJ / EDDP.
Passengers and pilots con see it.
Oh, then just guild pride, I suppose. They did it because they could.