brown coal mining wallpaperProviderpixabayResolution3456 × 2304Aspect ratio1.50:1Authornedu503SourceOpen original page Download wallpaper Available sizesPreview150 × 99Web640 × 426Large3456 × 2304Tagsbrown coal miningopen pit miningcoal miningquarrydegradationdumprheinbraungarzweiler iiraw materialsraw material extraction