| Borehole Year of Commissioning | Borehole No. | Borehole Depth (Average) |
| 1982 | 1 | 204.8 |
| 1985 | 1 | 200 |
| 1991 | 1 | 177 |
| 1992 | 3 | 135 |
| 1994 | 1 | 210 |
| 1999 | 1 | 202 |
| 2001 | 1 | 230 |
| 2003 | 3 | 200.67 |
| 2004 | 4 | 242.5 |
| 2005 | 6 | 287.83 |
| 2006 | 5 | 256 |
| 2007 | 4 | 277.5 |
| 2008 | 3 | 206.4 |
| 2009 | 5 | 292.4 |
| 2010 | 6 | 285.83 |
| 2011 | 24 | 287.38 |
| 2012 | 11 | 298.21 |
| 2013 | 9 | 268.33 |
| 2014 | 17 | 267.71 |
| 2015 | 9 | 290.33 |
| 2016 | 4 | 337.5 |
| 2017 | 3 | 280 |