It cannot be doubted that the gold-washings of New Grenada furnished, in the last years of public tranquillity, more than 18,000 marks of gold; that Choco and Barbacoa supply platinum in abundance; the valley of Santa Rosa in the province of Antioquia, the Andes of Quindiu and Gauzum near Cuenca, yield sulphuretted mercury; the table-land of Bogota (near Zipaquira and Canoas), fossil-salt and pit-coal; but even in New Grenada subterranean labours on the silver and gold veins have hitherto been very rare.
— from Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 3 by Alexander von Humboldt
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