Geology and Mineralogy of the J.J. Mine, Jo Dandy Area, Montrose County, Colorado Page: 5
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5
GEOLOGY AND MINERALOGY OF THE J. J. MINE, JO DANDY AREA,
MONTROSE COUNTY, COLORADO
By Donald P. Elston and Theodore Botinelly
ABSTRACT
Vanadium-uranium ore is mined at the J. J. mine in the Jo Dandy
area, Montrose County, Colo. The ore is in the upper sandstone layer of
the Salt Wash member of the Morrison formation of Late Jurassic age.
Permeability and variations in permeability in cross-stratified sandstone
units within the sandstone layer have influenced the gross distribution
and, in many places, controlled the detailed configuration of ore in the
J. J. mine. Carbonized wood apparently has been influential in localization
of ore minerals where sedimentary structures have allowed ore solutions
access to the wood. The J. J. mine intersects the ground water table,
and above the water table where the ore and enclosing sandstone are
oxidized, carnotite and "vanadium clay" are the major ore minerals. Below
the water table, the ore is unoxidized and montroseite, uraninite, and
coffininte are the major ore minerals. An intermediate oxidized zone
composed of hydrous vanadium oxides with intermediate valences is thin
and poorly defined. The configuration and distribution of ore are little
changed by oxidation. The ore minerals were emplaced by mineralizing
fluids which moved laterally through the sandstone and which deposited
low-valent minerals,
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Elston, Donald Parker & Botinelly, Theodore. Geology and Mineralogy of the J.J. Mine, Jo Dandy Area, Montrose County, Colorado, report, September 1955; Albuquerque, New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc501994/m1/7/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.