Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Rank | Mine | County | Operator | Capacity (thousands of metric tons) |
| --- | --- | --- | --- | --- |
| 1 | Morenci | Greenlee | Freeport-McMoRan | 390 |
| 2 | Ray | Pinal | ASARCO | 170 |
| 3 | Bagdad | Yavapai | Freeport-McMoRan | 100 |
| 4 | Sierrita | Pima | Freeport-McMoRan | 100 |
| 5 | Mission Complex | Pima | ASARCO | 70 |
| 6 | Silver Bell | Pima | ASARCO | 22 |
| 7 | Miami | Gila | Freeport-McMoRan | 50 |
| 8 | Pinto Valley | Gila | BHP Copper | 5 |
| 9 | Miami | Gila | BHP Copper | 5 |
| * (TBD) | Tohono | Pinal | Cyprus Amax Minerals | Closed |
| * (TBD) | Mineral Park | Mohave | Mercator Minerals | 6 |
| * (TBD) | Bisbee | Cochise | Freeport-McMoRan | Closed |
| * (TBD) | Safford | Graham | Freeport-McMoRan | (Opened December 2007) |
Question:
What rank is the Silver Bell mine of Pima county?
Answer:
6.0