The MD dropped slightly from blend 1 to blend 2 for both 300- and 750-kg batches, unlike the larger decrease observed at the 20-kg batches. This distinction between scales suggests that comilling at the larger scale had much less impact on macro-mixing due to more effective macro-mixing that occurred in the preceding bin mixing step. On the other hand, MD for blend 3 dropped significantly to 1.8% (300 kg) and 1.4% (750 kg), similar to that from the 20-kg batches. This is an indicator that macro-mixing in the second bin blender at the develop- ment scale was as sufficient as that at the commercial scale.