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Publication Extents

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Bedrock geology of the southwestern part of the North Range, Cuyuna district, Minnesota
R. G. Schmidt
1958, Miscellaneous Field Studies Map 181
The Cuyuna manganiferous iron-ore district is in central Minnesota in Morrison, Crow Wing, and Aitkin Counties.  The length of the district is about 68 miles, extending northeastward from a point near Randall, in Morrison County, to a point 11 miles east of the community of Hassmann in Aitkin County; the...
Zirconium and hafnium in the southeastern Atlantic States
J.B. Mertie Jr.
1958, Bulletin 1082-A
The principal source of zirconium and hafnium is zircon, though a minor source is baddeleyite, mined only in Brazil. Zircon is an accessory mineral in igneous, metamorphic, and sedimentary rocks, but rarely occurs in hardrock in minable quantities. The principal sources of zircon are therefore alluvial deposits, which are mined...