Preheat oven to 250 degrees. In a large bowl, combine the oats, nuts, coconut and brown sugar.
In a separate bowl or liquid measuring cup, combine maple syrup, oil and salt.
Combine both mixtures by slowly pouring the liquid over the oatmeal mixture and stirring well. Divide in half and pour onto two 11X17-inch rimmed baking sheets, spreading out into an even layer on each sheet.
Cook for 1 hour and 15 minutes, until golden.
Remove from the oven and transfer into a large bowl, slightly breaking up the clumps. Add the raisins and gently mix until even distributed.