ENVIRONMENTAL SURVEY OF THE NUCLEAR FUEL CYCLE. Page: 92 of 343
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B-9
average population density, 11.5 people per square mile, in the
four state mining area of the western United States.12
3. Description of the Uranium Milling Model Plant
Since the acid leach process is the predominant chemical proc-
essing method, it has been selected as the model for describing
the milling operation in the fuel cycle. Also, since in a
number of existing mine-mill complexes the mill location is
near the mine, the model mill selected is situated adjacent
to the mine property. The ore source is an open-pit mine
as described in the previous section on uranium mining and
its production capacity is nominally 1600 MT of ore per day.
The average assay of uranium content in the ore is about 0.2%.
Using these basic considerations for sizing the mill, about
960 MT of uranium concentrate are produced each year for the
design life of the mill, which is taken to be 20 years. This
annual capacity is equivalent to 5.3 annual fuel requirements
for the model LWR.
The model uranium mill uses mechanical crushing and an acid-
leach, solvent-extraction process, schematically shown in
Figure B-1. The basic steps in the acid-leach process are:
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ENVIRONMENTAL SURVEY OF THE NUCLEAR FUEL CYCLE., report, January 1, 1972; United States. (https://digital.library.unt.edu/ark:/67531/metadc1032058/m1/92/: accessed May 2, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.