Background to the Subject Incident
28. Sometime prior to 26 May 2004, as part of the development work associated with the integration of the underground workings in the Kayuga Seam with the underground workings in the Wynn Seam, a project was developed to split a pillar at the 1-2 cut-through in the Kayuga Seam.
29. The "pillar split" at the 1-2 cut-through in the Kayuga Seam commenced on Day Shift on 26 May 2004.
30. On 26 May 2004 Ashcroft assigned an underground mining crew to commence work on the Pillar Split at the 1-2 cut-through using a Mitsui 200 Road Header.
31. Thereafter, work continued on the Pillar Split at the 1-2 cut-through in the Kayuga Seam on each consecutive shift until the completion of the Night Shift on the morning of 28 May 2004.
32. On 28 May 2004 Ashcroft assigned a day shift crew to continue working on the Pillar Split with the Mitsui 200 Road Header. That day shift crew consisted of:
· James Adams - Mitsui 200 Road Header Operator and Steel Handler on the "gopher";
· Jim Adams - "Cable hand" for the Mitsui 200 Road Header and roof bolter; and
· Hamish Lister ('Lister") - Eimco Operator and "roustabout"; and
· John Daowlis ("Daowlis") - fitter.
33. The roof in the area of the Pillar Split was of sufficient concern for a specific direction to be given at the start of shift meeting held prior to the commencement of work on 26 May 2004. The concerns about the roof in the area of the Pillar Split were such that the development crews working on the Pillar Split were warned to keep cuts to a minimum, to erect one sheet of mesh roof support at a time and to maintain support close to the production face.
34. At the commencement of the Day Shift on 28 May 2004 the roof at the Pillar Split had been bolted to within about 0.5 metres of the face.
35. Further, at the commencement of the Day Shift on 28 May 2004 the heading at the Pillar Split was filled with spoil so that the crew spent the morning up to lunch time "cleaning up the spoil" left by the Night Shift Crew.
36. After lunch on 28 May 2004 the Day Shift Crew returned to the heading at the Pillar Split. Daowlis, the fitter, went to work on the boot end. The balance of the Day Shift Crew then commenced cutting coal:- James Adams operated the Mitsui 200 Road Header; Jim Adams handled the cable; and Lister, the Eimco driver and roustabout, provided general labouring support.
37. When James Adams had cut enough coal for between about "one to two mesh", he stopped cutting coal so that the next round of roof support could be erected.
38. The Mitsui 200 Road Header being used to cut the Pillar Split was not fitted with drill rigs.
39. As there were no drill rigs attached to the Road Header, roof support had to be erected in front of the Road Header, manually.
40. As roof support was to be erected manually, the Road Header had to be reversed back in the heading from the face a sufficient distance to enable the crew to obtain access to the roof in front of the Road Header, for the purpose of manually erecting roof support, whilst remaining behind the last line of previously erected roof support (i.e. working from under supported roof).
41. After James Adams stopped cutting coal, he reversed the Road Header back in the heading, he lowered the cutting head to the floor in the centre of the heading and turned the Road Header off. After the incident, the Dartbrook Mine surveyor established that the Road Header had been reversed back in the heading so that the Road Header's pineapple cutting head was located about 0.2 metres outbye of the last line of previously installed roof bolts.
42. After James Adams had turned off the Road Header, the isolation switch was engaged and both James Adams and Jim Adams "tagged out" the machine.
43. James Adams, Jim Adams and Lister then proceeded to carry the roof bolting equipment and materials inbye of the Road Header so that the next line of roof support, consisting of mesh and roof bolts, could be erected.
44. Once the roof bolting equipment and materials were in place, inbye of the Road Header, Jim Adams started the manual roof bolter and commenced boring holes in the roof of the heading for the roof bolts.
45. The Mine Manager's Support Rules for the Kayuga Seam, said to be applicable to the Pillar Split being performed at the time of the subject incident, provided for a 4/2 bolting pattern in the roof of the heading. The last line of roof support erected in the heading consisted of mesh held in place by two roof bolts so that the next line of support required by the Rules was to consist of mesh and four roof bolts drilled in across the heading.
46. Prior to the subject incident, Jim Adams bored three roof bolt holes into the roof of the heading starting from the left side of the heading looking inbye. But, no roof bolts were inserted into any of the three roof bolt holes bored by Jim Adams into the roof of the heading prior to the subject incident. Immediately prior to the subject roof fall, Jim Adams commenced drilling a fourth hole in the roof of the heading immediately adjacent to the right hand side of the heading looking inbye.
47. Jim Adams was still in the process of drilling the fourth hole, immediately adjacent to the right hand side of the cut-through looking inbye, when the subject roof collapse occurred.
48. It is unclear when and where James Adams was last seen prior to the subject roof fall.
49. However, when interviewed, Jim Adams stated that he last saw James Adams on the left hand side of the heading (looking inbye). But, Jim Adams did not know and could not say what James Adams was doing at the time of the subject roof fall.
50. Immediately after the roof fall, Jim Adams and Lister realised that James Adams had been struck by part of the roof fall and was trapped beneath fallen stone in the vicinity of the pineapple cutting head of the Road Header, which had been lowered to the floor near the centre of the heading.
51. James Adams suffered serious injury as a consequence of the fall and died a short time later as a consequence of those injuries.