Analysis of information sources in references of the Wikipedia article "Cobalt" in English language version.
the mine would be placed on care and maintenance for a period of no less than two years
cobaltum nostri uocant, Græci cadmiam; Cf. index under "cobaltum".
Dæmonum: Dæmon subterraneus trunculentus: bergterufel; mitis bergmenlein/kobel/guttel
Siddharth Kara's "Cobalt Red" takes a deep dive into the horrors of mining the valuable mineral – and the many who benefit from others' suffering.