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Fig. 9 | Swiss Journal of Geosciences

Fig. 9

From: 120 years of georesources research in Switzerland: the Swiss Geotechnical Commission (1899–2018)

Fig. 9

Outputs and revenues of coal production at the Käpfnach mine during 113 years (reproduced from Letsch, 1899). Vertical axis: tonnages and revenues from 1784–1896. The black bars mark the tonnages of the extracted coal with a maximum of 11′693 t in 1871 (highest bar). Black: produced coal per year (t), blue: produced fertilising marl (t), yellow: revenues from coal and marl sales (CHF). This coal mine was located near Horgen, situated in the Upper Freshwater Molasse close Lake Zurich, and was first documented in 1548. See Fig. 1 for location of the mine

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