Kalstadgangen with its small mines and prospects forms the eastern part of the Lindvikskollen-Kalstadgangen pegmatite dike.
Ref:
- Bjørlykke, H.(1937):"Mineral parageneses of some granite pegmatites near Kragerø, Southern Norway". Norsk Geologisk Tidsskrift, 17,1-16.
- Green, J.C.(1956):"Geology of the Storkollen-Blankenberg area, Kragerø, Norway". Norsk Geologisk Tidsskrift 36, 89-140 + plate I.
- Hongslo,T. & Langmyhr, F.J.(1960): Contributions to the mineralogy of Norway no. 6. On the chemical composition of blomstrandine and euxenite. Norsk geologisk Tidsskrift 40,157-164 [analysis of a sample of euxenite from Kalstadgangen]
- Oftedal, I. (1972): Contributions to the Mineralogy of Norway, No 48. Calsium-rich Gadolinite from Kragerø. Norsk Geologisk Tidsskrift 52: 197-200
