Browsing NGU Open Archive by Author "Neumann, Henrich"
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Kobberforekomster på Straumsheia.
Neumann, Henrich (NGU (191), Journal article, 1955)The deposits have been known for more than 250 years, and have been worked off and on during that period of time with no great success. The total production has probably not been more than one hundred tons of copper. As ... -
Silver deposits at Kongsberg. (The mineral assemblage of a native silver-cobalt-nickel ore type).
Neumann, Henrich (NGU (162), Journal article, 1944)The described deposits of the native silver - nickel - cobalt - arsenide type are found in a pre-cambrian series of the rocks, by far the greater part of which is made up of banded, dioritic and granitic gneisses. The ...