geological section soil layers coal and rock overburden open mine anthracite dark texture black color |
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| navigate by keyword : mine coal anthracite geology soil ground rock texture slit earth land cut section background mud nature environment dirt dry brown clay layers natural rough sand crust underground plant stone cliff outdoor structure light view open point stripping vein graphite shiny matte overburden miner panorama slate granite bitumen black oil petrified |
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| Geological section of soil, layers of coal and rock. Overburden open mine anthracite. Dark texture black color. |
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