public VoxelVariableStatistics Statistics {get;}

{
  //Get the variable profile on which to access the data
  var variable = voxelLayer.SelectedVariableProfile;
  //or use ...voxelLayer.GetVariableProfiles()

  //Data range
  var min = variable.Statistics.MinimumValue;
  var max = variable.Statistics.MaximumValue;

  //Color range (Continuous only)
  double color_min, color_max;
  if (variable.DataType == VoxelVariableDataType.Continuous)
  {
    var renderer = variable.Renderer as CIMVoxelStretchRenderer;
    color_min = renderer.ColorRangeMin;
    color_max = renderer.ColorRangeMax;
  }
}