| Value |
Category |
| 1 |
Water-sealed |
| 2 |
Closed pit |
| 3 |
Open pit |
| 4 |
Others (pail system, etc) |
| 5 |
None |
| Sysmiss |
|
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.