| Summary: | The present paper is published by NGU as a report from \"Statens Raastofkomite\" on the emergency production of arsenic during the war when the supplies, ordinarily imported, were cut off. The paper also contains a synopsis of the geology of the arsenic deposits of Norway. Pages 4-7 contain a description of the old smalt works of Modum in Southern Norway, where, many years ago, cobalt ore was mined for smalt, arsenic being obtained as a bi.product. The ore forms \"fahlbands\" and is too poor to be mined with profit at present. On pages 7-10 the Listøli arsenic mine in Telemark in Southern Norway is described. The ore occurs in a dike which is from 0,15 to 1 m wide. Besides arsenopyrite some tetrahedrite and molybdenite also occur. The total production from this mine amounts to about 400 tons of arsenic ore with an average content of 25-30 pct. As. On pages 10-20 the arsenic ores of Northern Norway are described. Arseno- pyrite is the only arsenic ore known from this part of the country. 35513
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