Arrange the following words in the logical and meaningful order.
1. Milling
2. Smelting
3. Leaching
4. Crushing
5. Calcining
6. stock pile
7. Dore
1
4 - 5 - 6 - 1 - 7 - 2 - 3
2
5 - 4 - 1 - 7 - 3 - 2 - 6
3
3 - 1 - 4 - 7 - 2 - 5 - 6
4
6 - 4 - 1 - 3 - 5 - 2 - 7