Excerpt from Special Reports on the Mineral Resources of Great Britain, Vol. 19: Lead and Zinc Ores in the Carboniferous Rocks of North Wales
In North and Central Wales lead and zinc mining has been most successfully prosecuted, and the importance of the mines, together with the varieties of the geological conditions presented by the lodes and the surrounding strata, has made it desirable to enter into considerable detail in the description of the 'mineral resources of that district. Accordingly the subject has been divided into three parts of which this memoir on the ores in the Carboniferous rocks is the first to appear. A. Second volume will deal with the ores of the Silurian rocks of Central Wales, while a third will be devoted to the consideration of the ores in the pre-carboniferous rocks of North Wales these are now in the press and will shortly be published.
The group of mines described in this memoir includes some of the largest lead and zinc producers in Britain, such as the celebrated Minera Mine. Some of the veins have yielded over 'a million pounds worth of ore, and it seems probable that the district is by no means exhausted, but that, if trade conditions permit, mining may be successfully carried on again on a large scale.
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