Preheat the oven to 275 degrees.
In a large bowl, mix together the oats, brown rice cereal, almonds, pecans, and chia seeds.
In a small bowl, stir together the ginger, cinnamon, nutmeg, and salt. Sprinkle this mixture into the large bowl.
In another small bowl, combine the melted coconut oil (or butter), maple syrup, and vanilla extract. Pour the liquid mixture over the dry ingredients and stir to cover evenly. Taste the mixture and adjust the seasonings to your liking.
Transfer the mixture to a 9x13 inch baking dish and gently press it down to make one even layer. Bake for about an hour. The granola should bind together and feel almost solid to the touch. It will continue to harden as it cools.
Remove the granola from the oven and let it cool completely before breaking it apart. Add the raisins to the granola, and store it in an airtight container. (Yields 8 cups.)