WLIMS (King and Schneider)

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Description

This article describes the King and Schneider (1995) model for drum-type Wet Low Intensity Magnetic Separators (WLIMS).[1]

Model theory

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Recovery to non-magnetics

Recovery to magnetics

Excel

The King and Schneider WLIMS model may be invoked from the Excel formula bar with the following function call: 

=mdUnit_WLIMS_KingSchneider(Parameters as Range, Size as Range, Feed as Range, MagneticsVolGrade As Range)

Invoking the function with no arguments will print Help text associated with the model, including a link to this page.

Inputs

The required inputs are defined below in matrix notation with elements corresponding to cells in Excel row ([math]\displaystyle{ i }[/math]) x column ([math]\displaystyle{ j }[/math]) format:

[math]\displaystyle{ \mathit{Parameters} = \begin{bmatrix} \text{Recover to NM (true/false)}\\ \mathit{SI}\text{ (-)}\\ g_{50}\text{ (v/v)}\\ \kappa\text{ (frac)}\\ \zeta\text{ (mm}^{-1}\text{)}\\ \end{bmatrix},\;\;\;\;\;\; \mathit{Size} = \begin{bmatrix} d_{1}\text{ (mm)}\\ \vdots\\ d_n\text{ (mm)}\\ \end{bmatrix},\;\;\;\;\;\; \mathit{Feed} = \begin{bmatrix} (Q_{\rm M,F})_{11}\text{ (t/h)} & \dots & (Q_{\rm M,F})_{1m}\text{ (t/h)}\\ \vdots & \ddots & \vdots\\ (Q_{\rm M,F})_{n1}\text{ (t/h)} & \dots & (Q_{\rm M,F})_{nm}\text{ (t/h)}\\ \end{bmatrix},\;\;\;\;\;\; }[/math]


[math]\displaystyle{ \mathit{MagneticsVolGrade} = \begin{bmatrix} (g_{\rm v})_{11}\text{ (v/v)} & \dots & (g_{\rm v})_{1m}\text{ (v/v)}\\ \vdots & \ddots & \vdots\\ (g_{\rm v})_{n1}\text{ (v/v)} & \dots & (g_{\rm v})_{nm}\text{ (v/v)}\\ \end{bmatrix}\;\;\; \text{or}\;\;\; \begin{bmatrix} (g_{\rm v})_{1}\text{ (v/v)} & \dots & (g_{\rm v})_{m}\text{ (v/v)}\\ \end{bmatrix},\;\;\;\;\;\; }[/math]


where [math]\displaystyle{ \text{Recover to NM} }[/math] indicates whether the recovery equations are for King and Schnieder's (1995) original recovery to the non-magnetics stream (true), or the alternative recovery to magnetics stream (false).

Note that [math]\displaystyle{ \mathit{MagneticsVolGrade} }[/math] can be specified on a per particle size per ore type basis, or with a singular value for all particle sizes of a given ore type.

Results

The results are displayed in Excel as an array corresponding to the matrix notation below:

[math]\displaystyle{ \mathit{mdUnit\_WLIMS\_KingSchneider} = \begin{bmatrix} \begin{array}{c} \begin{bmatrix} R_{\rm M}\text{ (frac)}\\ \end{bmatrix} \\ \\ \\ \end{array} \begin{array}{cccccc} \begin{bmatrix} \bar d_1\text{ (mm)}\\ \vdots\\ \bar d_n\text{ (mm)} \end{bmatrix} & \begin{bmatrix} (Q_{\rm M,M})_{11}\text{ (t/h)} & \dots & (Q_{\rm M,M})_{1m}\text{ (t/h)}\\ \vdots & \ddots & \vdots\\ (Q_{\rm M,M})_{n1}\text{ (t/h)} & \dots & (Q_{\rm M,M})_{nm}\text{ (t/h)}\\ \end{bmatrix} & \begin{bmatrix} (Q_{\rm M,NM})_{11}\text{ (t/h)} & \dots & (Q_{\rm M,NM})_{1m}\text{ (t/h)}\\ \vdots & \ddots & \vdots\\ (Q_{\rm M,NM})_{n1}\text{ (t/h)} & \dots & (Q_{\rm M,NM})_{nm}\text{ (t/h)}\\ \end{bmatrix} & \begin{bmatrix} (R_{\rm M})_{11}\text{ (frac)} & \dots & (R_{\rm M})_{1m}\text{ (frac)}\\ \vdots & \ddots & \vdots\\ (R_{\rm M})_{n1}\text{ (frac)} & \dots & (R_{\rm M})_{nm}\text{ (frac)}\\ \end{bmatrix} & \begin{bmatrix} (R_{\rm M})_1\text{ (frac)}\\ \vdots\\ (R_{\rm M})_n\text{ (frac)} \end{bmatrix} & \begin{array}{c} \begin{bmatrix} (R_{\rm M})_1 & \dots & (R_{\rm T})_m\\ \end{bmatrix} \\ \\ \\ \end{array} & \begin{bmatrix} \alpha_1\text{ (frac)}\\ \vdots\\ \alpha_n\text{ (frac)} \end{bmatrix} \end{array} \end{bmatrix} }[/math]


where:

  • [math]\displaystyle{ Q_{\rm M,M} }[/math] is mass flow rate of solids to the magnetics stream (t/h)
  • [math]\displaystyle{ Q_{\rm M,NM} }[/math] is mass flow rate of solids to the non-magnetics stream (t/h)

Example

The images below show the selection of input arrays and output results in the Excel interface.

Figure 1. Example showing the selection of the Parameters (blue frame) array in Excel.
Figure 2. Example showing the selection of the Size (red frame), Feed (purple frame), and VolumetricGrade (green frame) arrays in Excel.
Figure 3. Example showing the outline of the Results (light blue frame) array in Excel.

SysCAD

MD_MagneticSeparator page

The first tab page in the access window will have this name.

Tag (Long/Short) Input / Display Description/Calculated Variables/Options
Tag Display This name tag may be modified with the change tag option.
Condition Display OK if no errors/warnings, otherwise lists errors/warnings.
ConditionCount Display The current number of errors/warnings. If condition is OK, returns 0.
GeneralDescription / GenDesc Display This is an automatically generated description for the unit. If the user has entered text in the 'EqpDesc' field on the Info tab (see below), this will be displayed here.

If this field is blank, then SysCAD will display the unit class ID.

Requirements
On CheckBox This enables the unit. If this box is not checked, then the MassFracToMags option appears below.
MassFracToMags Input Only appears if the On field above is not checked. Specifies the fraction of feed mass that reports to the magnetics stream when the model is off.
NumParallelUnits Input The number of parallel, identical units to simulate:
  • Feed is divided by the number of parallel units before being sent to the unit model.
  • Unit model products are multiplied back by the same value and returned to the SysCAD product streams.
  • All unit model result values are shown per parallel unit.
Method User Defined The recovery to magnetics for each size interval is defined by the user.
WLIMS (King & Schneider) The recovery to magnetics for each size interval is defined by the King and Schneider model.
WHIMS (Dobby and Finch) The recovery to magnetics for each size interval is defined by the Dobby and Finch model.
Options
ShowQFeed CheckBox QFeed and associated tab pages (eg Sp) will become visible, showing the properties of the combined feed stream.
ShowQMags CheckBox QMags and associated tab pages (eg Sp) will become visible, showing the properties of the magnetics stream.
ShowQNonMags CheckBox QNonMags and associated tab pages (eg Sp) will become visible, showing the properties of the non-magnetics stream.
SizeForPassingFracCalc Input Size fraction for % Passing calculation. The size fraction input here will be shown in the Stream Summary section.
FracForPassingSizeCalc Input Fraction passing for Size calculation. The fraction input here will be shown in the Stream Summary section.
Stream Summary
MassFlow / Qm Display The total mass flow in each stream.
SolidMassFlow / SQm Display The Solids mass flow in each stream.
LiquidMassFlow / LQm Display The Liquid mass flow in each stream.
VolFlow / Qv Display The total Volume flow in each stream.
Temperature / T Display The Temperature of each stream.
Density / Rho Display The Density of each stream.
SolidFrac / Sf Display The Solid Fraction in each stream.
LiquidFrac / Lf Display The Liquid Fraction in each stream.
Passing Display The mass fraction passing the user-specified size (in the field SizeForPassingFracCalc) in each stream.
Passes Display The user-specified (in the field FracForPassesSizeCalc) fraction of material in each stream will pass this size fraction.

WLIMS page

The WLIMS page is used to specify the required model method and associated input parameters.

Tag (Long/Short) Input / Display Description/Calculated Variables/Options
WLIMS
HelpLink ButtonModelHelp.png Opens a link to this page using the system default web browser. Note: Internet access is required.
Parameters
RecoverToNonMags Checkbox Assigns recovery predicted by model equations to non-magnetics or magnetics product stream.
SharpnessIndex / SI Input Sharpness Index.
SeparationVolGrade / g50 Input Separation volume grade, i.e. grade cut point of separation.
BypassFraction / Kappa Input Fractional coefficient of the bypass equation.
BypassExpFactor / Zeta Input Exponential factor of the bypass equation.
Liquids
LiquidsSeparMethod Split To Mags (User) Liquids are split to magnetics by a user-defined fraction of liquids in the feed.
Mags Solids Fraction Sufficient liquids mass is recovered to the magnetics stream to yield the user-defined magnetics solids mass fraction value (if possible).
Mags Liquids Fraction Sufficient liquids mass is recovered to the magnetics stream to yield the user-defined magnetics liquids mass fraction value (if possible).
MagsSolidsFracReqd / Mags.SfReqd Input Required value of the mass fraction of solids in the magnetics stream. Only visible if Mags Solids Fraction is selected.
MagsLiquidsFracReqd / Mags.LfReqd Input Required value of the mass fraction of liquids in the magnetics stream. Only visible if Mags Liquids Fraction is selected.
LiqSplitToMags Input/Display The fraction of feed liquids recovered to the magnetics stream.

Magnetics page

This page is used to specify the volumetric grade of magnetics phase input parameters.

Tag (Long/Short) Input / Display Description/Calculated Variables/Options
Distribution
Name Display Shows the name of the SysCAD Size Distribution (PSD) quality associated with the feed stream.
IntervalCount Display Shows the number of size intervals in the SysCAD Size Distribution (PSD) quality associated with the feed stream.
SpWithPSDCount Display Shows the number of species in the feed stream assigned with the SysCAD Size Distribution (PSD) quality.
MagneticsVolGrade
Selection Stream A single magnetics volumetric grade value is specified for all species and sizes.
Species Magnetics volumetric grade values are specified per species, for all sizes of that species.
Size Magnetics volumetric grade values are specified per size interval, for all species in that interval.
Species-Size Individual magnetics volumetric grade values are specified for each size interval of each species.
Size Display Size of each interval in internal mesh series.
MeanSize Display Geometric mean size of each interval in internal mesh series.
MagneticsVolGrade Input / Display Magnetics volumetric grade for each size interval, in each solid species.

WLIMSKingSchneider4.png WLIMSKingSchneider5.png

WLIMSKingSchneider6.png WLIMSKingSchneider7.png

Recovery page

The Recovery page is used to display (or specify) the recovery by species/component/element/individual phase and size values.

Tag (Long/Short) Input / Display Description/Calculated Variables/Options
Distribution
Name Display Shows the name of the SysCAD Size Distribution (PSD) quality associated with the feed stream.
IntervalCount Display Shows the number of size intervals in the SysCAD Size Distribution (PSD) quality associated with the feed stream.
SpWithPSDCount Display Shows the number of species in the feed stream assigned with the SysCAD Size Distribution (PSD) quality.
Recovery
Method Model / User Select model-calculated or user-defined recovery to separate each solids species type.
Density Display Density of each solid species.
Size Display Size of each interval in mesh series.
MeanSize Display Geometric mean size of each interval in mesh series.


All (All column) Display
  • Actual overall recovery to magnetics of all solid species, for each size interval.
  • Excludes solid species not present in the magnetic separator feed.
Recovery Display
  • Recovery to magnetics for each size interval, in each solid species, as determined by the selected model or user defined value.
  • Note: These values are displayed regardless of whether the solid species is present in the magnetic separator feed or not.
All (All row, All column) Display
  • Displays the actual, total, recovery of all solids with a particle size distribution property in the feed to magnetics.
  • Excludes solid species not present in the magnetic separator feed.
All (All row, per species) Display
  • Actual overall recovery to magnetics for each solid species, for all size intervals in that species.
  • Excludes solid species not present in the magnetic separator feed.
CmpRecovery
Components
ButtonHideComponents.png
ButtonShowComponents.png
 Hides or shows component recovery table.
Size Display Size of each interval in mesh series.
MeanSize Display Geometric mean size of each interval in mesh series.
All (All column) Display
  • Actual overall recovery to magnetics of all solid components, for each size interval.
  • Excludes solid components not present in the magnetic separator feed.
CmpRecovery Display
  • Recovery to magnetics for each size interval, in each solid component, as determined by the selected model or user defined value.
  • Excludes solid components not present in the magnetic separator feed.
All (All row, All column) Display
  • Displays the actual, total, recovery of all solid components with a particle size distribution property in the feed to magnetics.
  • Excludes solid components not present in the magnetic separator feed.
All (All row, per component) Display
  • Actual overall recovery to magnetics for each solid component, for all size intervals in that component.
  • Excludes solid components not present in the magnetic separator feed.
EleRecovery
Elements
ButtonHideElements.png
ButtonShowElements.png
 Hides or shows element recovery table.
Size Display Size of each interval in mesh series.
MeanSize Display Geometric mean size of each interval in mesh series.
All (All column) Display
  • Actual overall recovery to magnetics of all solid elements, for each size interval.
  • Excludes solid elements not present in the magnetic separator feed.
EleRecovery Display
  • Recovery to magnetics for each size interval, in each solid element, as determined by the selected model or user defined value.
  • Excludes solid elements not present in the magnetic separator feed.
All (All row, All column) Display
  • Displays the actual, total, recovery of all solid elements with a particle size distribution property in the feed to magnetics.
  • Excludes solid elements not present in the magnetic separator feed.
All (All row, per element) Display
  • Actual overall recovery to magnetics for each solid element, for all size intervals in that component.
  • Excludes solid elements not present in the magnetic separator feed.
IPhRecovery
IPhases
ButtonHideIPhases.png
ButtonShowIPhases.png
 Hides or shows individual phases recovery table.
Size Display Size of each interval in mesh series.
MeanSize Display Geometric mean size of each interval in mesh series.
All (All column) Display
  • Actual overall recovery to magnetics of all solid individual phases, for each size interval.
  • Excludes solid individual phases not present in the magnetic separator feed.
IPhRecovery Display
  • Recovery to magnetics for each size interval, in each solid individual phase, as determined by the selected model or user defined value.
  • Excludes solid individual phases not present in the magnetic separator feed.
All (All row, All column) Display
  • Displays the actual, total, recovery of all solid individual phases with a particle size distribution property in the feed to magnetics.
  • Excludes solid individual phases not present in the magnetic separator feed.
All (All row, per individual phase) Display
  • Actual overall recovery to magnetics for each solid individual phase, for all size intervals in that component.
  • Excludes solid individual phases not present in the magnetic separator feed.

CSz page

The CSz page provides composition and constituent information by particle size for QFeed, QMags, and QNonMags. It appears after the standard SysCAD stream information when the corresponding stream display option is selected.

  • Results are available for Species, Component, Element, and Individual Phase, with views for Composition, Distribution by Size, and Stream Contribution.
  • The calculations are described in Stream Analyser - Composition by Size.
  • These combined composition-by-size results are not available in the standard SysCAD stream pages. They are particularly useful for comparing simulated results with measured size-by-size data, such as elemental assays or mineral grades by size.
Tag (Long/Short) Input / Display Description/Calculated Variables/Options
Distribution
Name Display Shows the name of the SysCAD Size Distribution (PSD) quality associated with the feed stream.
IntervalCount Display Shows the number of size intervals in the SysCAD Size Distribution (PSD) quality associated with the feed stream.
SpWithPSDCount Display Shows the number of species in the feed stream assigned with the SysCAD Size Distribution (PSD) quality.
CSz
Property Composition Displays the mass fraction of each species, component, element, or individual phase within each size interval. The All row displays the overall composition over all size intervals.
Distribution by Size Displays the fraction of each constituent's total mass that occurs in each size interval. The All column displays the distribution by size of all solids with a particle size distribution property in the selected stream.
Stream Contribution Displays each constituent and size interval mass as a fraction of the total mass of all solids with a particle size distribution property in the selected stream.
Comp
Size Display Size of each interval in the mesh series.
All (All column) Display Total composition of all solids with a particle size distribution property in each size interval. The result is 100% when the interval contains solids with a particle size distribution property and 0 when it does not.
Comp Display Mass fraction of each solid species with a particle size distribution property within each size interval.
All (All row, All column) Display Total composition of all solids with a particle size distribution property over all size intervals. The result is 100% when the selected stream contains solids with a particle size distribution property and 0 when it does not.
All (All row, per species) Display Overall mass fraction of each solid species with a particle size distribution property in the selected stream for all size intervals.
CmpComp
Components
ButtonHideComponents.png
ButtonShowComponents.png
 Hides or shows the component composition table.
Size Display Size of each interval in the mesh series.
All (All column) Display Total composition of all solids with a particle size distribution property in each size interval. The result is 100% when the interval contains solids with a particle size distribution property and 0 when it does not.
CmpComp Display Mass fraction of each displayed solid component within each size interval.
All (All row, All column) Display Total composition of all solids with a particle size distribution property over all size intervals.
All (All row, per component) Display Overall mass fraction of each displayed solid component in the selected stream over all size intervals.
EleComp
Elements
ButtonHideElements.png
ButtonShowElements.png
 Hides or shows the element composition table.
Size Display Size of each interval in the mesh series.
All (All column) Display Total composition of all solids with a particle size distribution property in each size interval. The result is 100% when the interval contains solids with a particle size distribution property and 0 when it does not.
EleComp Display Mass fraction of each displayed element within each size interval.
All (All row, All column) Display Total composition of all solids with a particle size distribution property over all size intervals.
All (All row, per element) Display Overall mass fraction of each displayed element in the selected stream over all size intervals.
IPhComp
IPhases
ButtonHideIPhases.png
ButtonShowIPhases.png
 Hides or shows the individual phase composition table.
Size Display Size of each interval in the mesh series.
All (All column) Display Total composition of all solids with a particle size distribution property in each size interval. The result is 100% when the interval contains solids with a particle size distribution property and 0 when it does not.
IPhComp Display Mass fraction of each displayed individual phase within each size interval.
All (All row, All column) Display Total composition of all solids with a particle size distribution property over all size intervals.
All (All row, per individual phase) Display Overall mass fraction of each displayed individual phase in the selected stream over all size intervals.
Dist
Size Display Size of each interval in the mesh series.
All (All column) Display Fraction of the total mass of all solids with a particle size distribution property in the selected stream that occurs in each size interval.
Dist Display Fraction of the total mass of each solid species with a particle size distribution property that occurs in each size interval.
All (All row, All column) Display Total distribution by size of all solids with a particle size distribution property. The result is 100% when the selected stream contains solids with a particle size distribution property and 0 when it does not.
All (All row, per species) Display Total distribution by size of each solid species with a particle size distribution property. The result is 100% when that species is present and 0 when it is not.
CmpDist
Components
ButtonHideComponents.png
ButtonShowComponents.png
 Hides or shows the component distribution-by-size table.
Size Display Size of each interval in the mesh series.
All (All column) Display Fraction of the total mass of all solids with a particle size distribution property in the selected stream that occurs in each size interval.
CmpDist Display Fraction of each displayed solid component's total mass that occurs in each size interval.
All (All row, All column) Display Total distribution by size of all solids with a particle size distribution property.
All (All row, per component) Display Total distribution by size of each displayed solid component. The result is 100% when that component is present and 0 when it is not.
EleDist
Elements
ButtonHideElements.png
ButtonShowElements.png
 Hides or shows the element distribution-by-size table.
Size Display Size of each interval in the mesh series.
All (All column) Display Fraction of the total mass of all solids with a particle size distribution property in the selected stream that occurs in each size interval.
EleDist Display Fraction of each displayed element's total mass that occurs in each size interval.
All (All row, All column) Display Total distribution by size of all solids with a particle size distribution property.
All (All row, per element) Display Total distribution by size of each displayed element. The result is 100% when that element is present and 0 when it is not.
IPhDist
IPhases
ButtonHideIPhases.png
ButtonShowIPhases.png
 Hides or shows the individual phase distribution-by-size table.
Size Display Size of each interval in the mesh series.
All (All column) Display Fraction of the total mass of all solids with a particle size distribution property in the selected stream that occurs in each size interval.
IPhDist Display Fraction of each displayed individual phase's total mass that occurs in each size interval.
All (All row, All column) Display Total distribution by size of all solids with a particle size distribution property.
All (All row, per individual phase) Display Total distribution by size of each displayed individual phase. The result is 100% when that individual phase is present and 0 when it is not.
Contr
Size Display Size of each interval in the mesh series.
All (All column) Display Fraction of the total mass of all solids with a particle size distribution property in the selected stream that occurs in each size interval.
Contr Display Stream Contribution of each solid species with a particle size distribution property and size interval to the total mass of all solids with a particle size distribution property in the selected stream.
All (All row, All column) Display Total stream contribution of all solids with a particle size distribution property. The result is 100% when the selected stream contains solids with a particle size distribution property and 0 when it does not.
All (All row, per species) Display Overall stream contribution of each solid species with a particle size distribution property for all size intervals.
CmpContr
Components
ButtonHideComponents.png
ButtonShowComponents.png
 Hides or shows the component stream contribution table.
Size Display Size of each interval in the mesh series.
All (All column) Display Fraction of the total mass of all solids with a particle size distribution property in the selected stream that occurs in each size interval.
CmpContr Display Stream Contribution of each displayed solid component and size interval to the total mass of all solids with a particle size distribution property in the selected stream.
All (All row, All column) Display Total stream contribution of all solids with a particle size distribution property.
All (All row, per component) Display Overall stream contribution of each displayed solid component for all size intervals.
EleContr
Elements
ButtonHideElements.png
ButtonShowElements.png
 Hides or shows the element stream contribution table.
Size Display Size of each interval in the mesh series.
All (All column) Display Fraction of the total mass of all solids with a particle size distribution property in the selected stream that occurs in each size interval.
EleContr Display Stream Contribution of each displayed element and size interval to the total mass of all solids with a particle size distribution property in the selected stream.
All (All row, All column) Display Total stream contribution of all solids with a particle size distribution property.
All (All row, per element) Display Overall stream contribution of each displayed element for all size intervals.
IPhContr
IPhases
ButtonHideIPhases.png
ButtonShowIPhases.png
 Hides or shows the individual phase stream contribution table.
Size Display Size of each interval in the mesh series.
All (All column) Display Fraction of the total mass of all solids with a particle size distribution property in the selected stream that occurs in each size interval.
IPhContr Display Stream Contribution of each displayed individual phase and size interval to the total mass of all solids with a particle size distribution property in the selected stream.
All (All row, All column) Display Total stream contribution of all solids with a particle size distribution property.
All (All row, per individual phase) Display Overall stream contribution of each displayed individual phase for all size intervals.

About page

This page is provides product and licensing information about the Met Dynamics Models SysCAD Add-On.

Tag (Long/Short) Input / Display Description/Calculated Variables/Options
About
HelpLink ButtonLicensingHelp.png Opens a link to the Installation and Licensing page using the system default web browser. Note: Internet access is required.
Information ButtonCopyToClipboard.png Copies Product and License information to the Windows clipboard.
Product
Name Display Met Dynamics software product name
Version Display Met Dynamics software product version number.
BuildDate Display Build date and time of the Met Dynamics Models SysCAD Add-On.
License
File ButtonBrowse.png This is used to locate a Met Dynamics software license file.
Location Display Type of Met Dynamics software license or file name and path of license file.
SiteCode Display Unique machine identifier for license authorisation.
ReqdAuth Display Authorisation level required, MD-SysCAD Full or MD-SysCAD Runtime.
Status Display License status, LICENSE_OK indicates a valid license, other messages report licensing errors.
IssuedTo Display Only visible if Met Dynamics license file is used. Name of organisation/seat the license is authorised to.
ExpiryDate Display Only visible if Met Dynamics license file is used. License expiry date.
DaysLeft Display Only visible if Met Dynamics license file is used. Days left before the license expires.

Additional notes

  • Solid species that do not possess a particle size distribution property are split according to the overall mass split of the default particle size distribution species selected in the SysCAD Project Configuration.
  • If the default particle size distribution species is not present in the unit feed, the overall split of all other species with particle size distributions combined is used, as determined by the model.
  • Gas phase species report directly to the non-magnetics stream without split.

External links

References

  1. ↑ King, R.P. and Schneider, C.L., 1995. Computer simulation of taconite grinding and concentration circuits. Utah Comminution Center, University of Utah.
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