Florida Lead & Zinc Mine. Lead mine in Ystrad Fflur.

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https://creativecommons.org/licenses/by-sa/3.0/deed.en

Picture 1, by Chris Popham: https://commons.wikimedia.org/wiki/File:Florida_Lead_&_Zinc_Mine.jpg

Picture 2, by Chris Popham: https://commons.wikimedia.org/wiki/File:Florida_Lead_&_Zinc_Mine_(1).jpg

Picture 3, by Chris Popham: https://commons.wikimedia.org/wiki/File:Florida_Lead_&_Zinc_Mine_(2).jpg

Picture 4, by Chris Popham: https://commons.wikimedia.org/wiki/File:Florida_Lead_&_Zinc_Mine_(3).jpg