Gas mixture is the main raw material for Estonia’s energy and chemical industries, and it is extracted in our day from open quarries or underground shafts. This layer was established during the Ordovician Period between 450 and 480 million years ago, and it is made up of the remnants of plants and animals from that age. In the Kohtla-Nõmme suburb, there is a shaft which can be toured in the company of a guide who will tell you that this is the only layer of its kind in the Baltic States. He will tell you about how the gas mixture has been extracted over the course of history.
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In the village of Kiviõli, in turn, you can climb an old hill of slag from the gas mixture (Vana tuhamägi). This will open up a view of one of Estonia’s most interesting landscapes. For more information: www.kivioli.ee (available in English).
