Preheat oven to 180 Degrees Celcius (350F).

Line the loaf pan with parchment paper, allowing it to overhang on the two long sides.

In a large bowl, sift together flour, salt, and baking soda.

Toss blueberries and dried nuts into the same bowl.

Set dry ingredients aside.

In another bowl, whisk together egg, brown sugar, and granulated sugar until well combined and smooth.

Add buttermilk, orange juice, oil, vanilla extract, and orange zest to the wet ingredients.

Stir to combine.

Slowly pour the dry ingredients into the wet ingredients.

Gently whisk until just combined, being careful not to overmix.

Pour the batter into the prepared loaf pan.

Bake for 45 minutes to 1 hour, or until a toothpick inserted into the center comes out clean.

Allow the loaf to cool completely on a wire rack before slicing.