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You need Evaluate() as
Evaluate ( "Min(" & $nList & ")" )
An alternative to using Min() on the completed list is to locate the lowest value as you are looping to build the list.
Using looping structure, assign the $nListLowest to the first value in the list.
As you loop over new values, assign the new value to be $nListLowest if it is lower than the current value of $nListLowest.
In this, make sure to use GetAsNumber($nValue) < GetAsNumber($nListLowest) so that you avoid comparing the number values as strings.