Preheat oven to 350°F.

Brush a sheet pan generously with vegetable oil.  Combine the cashews, walnuts, pecan and almonds in a large bowl.  In a small bowl, combine 2 tablespoons of vegetable oil, the maple syrup, brown sugar and orange juice.  Pour mixture over the mixed nuts and stir to fully incorporate.  Add 2 tablespoons of the rosemary and 2 teaspoons of salt and toss again to coat the nuts evenly.  Turn onto the prepared sheet pan.

Spread the nuts in one layer. Roast for 25 minutes, stirring twice with a large metal spatula, until the nuts are glazed and golden brown.  Remove from the oven and sprinkle with 2 teaspoons of salt and the remaining 2 tablespoons of rosemary. Toss well and set aside at room temperature, stirring occasionally to prevent sticking as they cool. Taste for seasoning.