Potash ore has long been mined in the city where I live. It was extracted in an open way. So there is an old quarry near the city, where white salt has been deposited in some places. The quarry is now overgrown with trees and looks like a beautiful mountain. And everyone who comes to the city is amazed how in the middle of summer on such a low mountain can be snow.

Only because of this I thought that there might be salt in the photo. I really don't know what it is. The Carpathians are low mountains and in summer it is warm enough that there is no snow. Maybe it's a film, but then it covers a fairly large area.