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<p>[QUOTE=&quot;Marco Tizzoni, post: 4043406, member: 20177&quot;]Here you can see an excellent way to get very dirty and to destroy your cameras. It was taken in an argentiferous galene mine in limestone in the Alps. It was radiocarbon dated to the 13th cent. A.D. You can see how it was dug. The smooth and blackened surfaces of the rock show it was dug by fire&nbsp; setting, the whithish marks on the black surfaces are chisel marks.&nbsp; The bottom of the mine is covered and filled by debris. This because these mines were dug by inverse steps, which means digging forward and at the same time upward leaving the sterile rock falling at your feet. Since taking the sterile rock outside is just a waste of time and money the ancient miners used to fill in the abandoned parts of a mine as much as they could with sterile rock. This fueled in the 19th cent, the legend of the dwarfs. Moreover when the ancient miners met a sterile area they tunnelled across it with the smallest possible gallery, just enough to crawl along it. But when you have no explosives there is no other way to dig a mine and enrich yourselves.[/QUOTE]</p><p><br /></p>

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