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Updated: May 23, 2025
The coals most valued at the present moment in Hungary are those of the Secondary and not of the Palæozoic period. But the great body of coal is very much newer; it is Tertiary, and till lately was regarded as of comparatively modern date. In the Ysil Valley there is a splendid deposit of true coal."
Since the time when the above was written the resources of the Ysil or Sil Valley viz., Petrosèny have been abundantly developed, as we see, and it has been pronounced to be "one of the finest coal mines in Europe." One of the seams of coal is ninety feet in thickness; but up to the present time it has been found impossible to make it into coke.
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