In particular, it is asserted the defendants:
(a) at all material times operated the Baal Bone Colliery and was in control of the places of work contained therein.
(b) at all material times employed a number of personnel, including . . . to work at the Baal Bone Colliery.
(c) at all material times had non-employees on site, including . . . who worked at Baal Bone Colliery but were employed . . .
(d) failed to ensure that support was provided to the face of Longwall 21 in the vicinity of Longwall 21 tailgate and 51 cut-through whilst work was being performed in that vicinity.
(e) failed to devise, have in place and implement a Safe Work Procedure for the support of the face and roof of that part of Longwall 21 in the area where personnel were undertaking drilling for a shotfiring operation.
5 The charge against Oakbridge names Alan Frederick Eckford, Jan Kapusta, Thomas Walter Bennett and James Allan Boyes as the persons not in its employment who were exposed to a risk at its place of work. The charge against Wallerawang names Graham Francis Jordan as the person not in its employment who was exposed to risk at its worksite.
6 The defendants each pleaded guilty to the charges under s8(1) and s8(2) of the Act.
7 The first defendant, Oakbridge, oversaw the operation of the colliery. On the day of the incident, 12 September 2001, the Mine Managers and Deputies underground reported to the Oakbridge General Manager. The day-to-day management of the colliery was performed by employees of the second defendant, Wallerawang. The colliery operated 24 hours a day, five days per week. The colliery had been in operation since 1983 under various ownerships. The colliery employed 189 persons at the time of the incident and currently employs 173 persons. It had the usual management structure in accordance with the Coal Mining Regulation Act 1982. The joint responsibilities shared between the two defendants meant the crew at the time of the incident had five miners employed by Wallerawang and one employed by Oakbridge.
8 Mr D.B. O'Neil with Mr D.L. Carroll of counsel appeared for the prosecution. The prosecution relied upon Agreed Facts, Extracts of Interviews conducted by Inspectorate and a Tender Bundle including documents being: flow chart indicating company structure of the mine; DVD depicting Baal Bone shearer; photographs; flow chart of relevant persons; side view of accident on 12 September 2001, Baal Bone Colliery geological features - false roof profile; plan views of accident as at 12 and 13 September 2001; Locality Plan of Accident on 12 September 2001; Breakdown of Incident Reports of Rib Falls at Baal Bone Colliery (24 May 1993 to 12 September 2001) and Deputy/Supervisor Accident/Incident Report Forms - 24 May 1993 to 12 September 2001; Erection of Temporary Support for Cut and Weld on Pans (2 July 2001); submission (4 August 2000) of Shotfiring and Explosives Plan) Regulation 1999 (Clause 154), Baal Bone Colliery and letter (18 August 2000); Longwall 19 Face Management Plan (19 May 2000); Longwall 19 to 24 Risk Assessment (extract) (7 March 2000); Hazard Plan - LW 21 (27 August 2001); Deputy's Reports (10-12 September 2001) and Deputy Manager and Undermanager-in-Charge - Daily Reports (10-12 September 2001); Longwall Prosper Reports (Process Performance) (10-12 September 2001); Safety Management Plan Overview; Baal Bone Colliery Mine Inspection System; Management Plan (March 2001); Strata Management Plan, Longwall 21; Manager's Support Rules - Extraction of Longwall Panel 21; Safety Alert (21 September 2001). The prosecution called no witnesses.
9 Mr B.D. Hodgkinson SC with Mr M.L. Shume of counsel appeared for the corporate defendants. The defendants tendered an affidavit of David Mellows, Group Safety Manager at Xstrata Coal (NSW) Pty Ltd, sworn 5 March 2008. He attached to his affidavit significant documentation as to the investigations of the incident and prior and subsequent systems of work in place at the colliery. Mr Mellows was required for cross examination.
10 The Agreed Statement of Facts relevantly reads:
Background
1. The Baal Bone Colliery ("the colliery", "the mine") is located on the northern periphery of the Western Coalfields of NSW about 20km north of Lithgow and 14km north of Wallerawang.
2. The Wallerawang Collieries Ltd ("Wallerawang") was at all material times a wholly owned subsidiary of Oakbridge Pty Ltd ("Oakbridge"). Wallerawang and Oakbridge were at all material times related companies and members of the same corporate group ("the group").
3. The colliery was acquired by the group in April 2000.
4. At all material times the mine was operated jointly by Wallerawang and Oakbridge.
Mining method
5. As at September 2001 underground coalmining operations at the mine were being conducted using the longwall method. The specific method implemented at the time is referred to as "retreat longwall mining". A scraper conveyor runs the length of the coalface supporting an electrically driven drum shearer. As the shearer shears coal up to one metre thick from the face the cut coal falls onto a conveyor belt known as the armoured face conveyor ("AFC"). The coal is transported away from the longwall by the AFC.
6. At longwall 21 in September 2001 the work was at a depth from the surface of approximately 135-220 metres. The cutting of the coal at longwall 21 was undertaken using the unidirectional method - that is the shearer cut in one direction only.
7. In the course of mining the longwall face the workmen are protected from roof fall by hydraulically operated steel roof supports known as chock shields' or chocks'. These are advanced systematically in sequence by the longwall operators as coal is removed from the longwall face during each pass of the longwall shearer.
The workers
8. As at 12 September 2001 the late Graham Jordan was employed by Oakbridge. Alan Eckford, Jan Kapusta, Thomas Bennett and James Boyes were employed by Wallerawang.
9. Other relevant workers included David Hetherington, the Mine Manager, Joe Donachie, the Longwall Superintendent and Simon Burnett, the Production Manager and Undermanager in Charge.
Circumstances at the mine leading up to 12 September 2001
10. Between 7 and 12 September 2001 the floor of longwall 21 in the vicinity of the tailgate had risen approximately 0.5 metres above the original floor level, interfering with the conduct of mining operations.
11. Over the afternoon and night shifts of 11 September 2001 and the day shift of 12 September 2001 attempts to compensate for the loss of floor horizon had been made by cutting into the roof, approximately 700mm in total.
12. The cuts made by the shearer out of the roof resembled a series of upward steps cut above the coal seam and into the "false roof'.
13. These measures proved insufficient to enable the coal shearer to continue operating. The tailgate chocks became "iron bound" - that is, they were stuck or wedged and could not be moved.
14. As a result of the process of cutting into the roof the "false roof' came to constitute part of the. longwall 21 face in the vicinity of the tailgate. The bottom 1.95 metres (approximately) of the face was made up of coal and the top 350mm (approximately) was made up of rock.
12 September 2001 incident
15. At approximately 12.25pm on 12 September 2001, Longwall Superintendent, Joe Donachie, Production Manager, Simon Burnett and Mine Deputy Lyndsay Mobbs attended Mr Donachie's office and discussed the shot firing of the floor in the tailgate of longwall 21 to regain floor horizon. Mr Jordan was involved in discussions concerning the shot firing task prior to commencing his shift and prior to the shot firing task proceeding.
16. The risks associated with the fall of rock from the roof were identified. Additional roof support was installed in the form of bolts and mesh.
17. Messrs Jordan, Eckford, Boyes and Bennett were directed to undertake shotfiring, under the direction of Mine Undermanager Jan Kapusta.
18. Subsequently, Messrs Jordan, Eckford, Boyes, Bennett and Kapusta commenced work on the floor near the longwall face where the shotfiring operation was to be undertaken. The location of the incident site at the mine is depicted at tab 8. Alan Eckford, with the assistance of Bennett, drilled six charge holes in the floor of longwall 21 in the near vicinity of the longwall 21 face. Thereafter, Boyes and Bennet retreated a distance of approximately ten metres to beneath hydraulic roof support 155 leaving Eckford, Jordan and Kapusta near the longwall face.
19. All this work was done whilst the workers were in the area between the AFC and the coal face. The shotfiring preparation work involved working in a crouching position when placing the charge in the holes.
20. Approximately 30-45 minutes expired between the time the longwall face was first accessed and the time the rock fell onto Mr Jordan. Approximately 20-30 minutes were required to drill six charge holes and to charge them. The relevant section of the longwall 21 face was not provided with any means of support whilst the work was being performed by Messrs Jordan, Eckford, Boyes, Bennett and Kapusta.
21. The charge holes had been drilled into the floor of longwall 21 within 300 and 900mm of the face and five had been charged with explosives in preparation for shotfiring.
22. Whilst Mr Jordan was in the process of charging the sixth and last charge hole with explosives a piece of shale approximately 2.2 metres in length, 600mm in width and 400mm at its highest point, detached from the face of longwall 21 approximately five metres from the intersection of the longwall 21 tailgate roadway. The falling rock struck Mr Jordan between 4:30pm and 5:00pm on 12 September 2001 causing injuries.
23. At 3.41 am on 13 September 2001 Mr Jordan died at Nepean Hospital as a result of hypovolaemic shock with antecedent causes including crush injury, pelvic haemorrhage, coagulapathy and hypothermia.
24. Alan Frederick Eckford was also struck by the falling rock, causing a fracture to his right humerus, a laceration requiring three stitches to the right side of his head and soft tissue injuries to his right ribs, right knee, ankles and nose.
25. At approximately 5.30pm on 12 September 2001 District Inspector David Carey received an initial report of the incident and attended Baal Bone Colliery. He made an inspection of the incident site with District CFMEU Check Inspector Trevor Schram. Longwall Superintendent Joseph Donachie, Production Manager, Simon Burnett,
Mine Manager, David Hetherington and Shift Undermanager, Jan Kapusta. District Inspector Carey made the following observations of the accident site:
• A piece of stone 400mm thick at the top and 600mm thick at the bottom of the floor close to the tailgate in three pieces. The largest piece was 2.2 metres long, tapering about mid-length towards the maingate end of the longwall to approximately 300mm wide by 100mm thick. This piece of rock was approximately five metres from the ribbed side of the tailgate heading along the longwall face.
• A miner's belt (later identified as belonging to Mr Jordan) was underneath the rock 5.0 metres from the tailgate block side rib line.
• The coal face of longwall 21 was six metres from the front leg of chock 158.
• The tailgate area exhibited heavy roof support consisting of cuttable steel cans, cable bolts, spin bolts, roof mesh and bolts, steel beams and prop setter timbers.
• The floor in front of the cut face was about 0.5 metres thick, extending from the tailgate area about ten metres and sloping away towards the maingate.
• Six shot holes were drilled into the coal floor parallel to the coal face in the configuration of two rows of three holes. Five of these holes had been charged with explosives. Fallen stone covered two of the loaded holes whilst three were visible.
• Support had been put in place around the cavity created by the fall of rock, consisting of two (2) sheets of half meshed modules of two (2) bolts with butterfly plates, at the direction of Mine Undermanager Jan Kapusta.
The risk of rock falling from the face
26. The risk of being exposed to falling rocks or coal whilst working near an unsupported face was well known to the Defendants prior to 12 September 2001. Thirty-nine previously reported incidents of falls of rock or coal at the mine were recorded in the mine's records between 1993 and 2001. Eight involved the fall of rock or coal between five kilograms and 30 tonnes in weight, 20 involved falls of less than five kilograms and 11 involved falls of rock or coal of an unidentified weight.
27. The Baal Bone Colliery Safety Management Plan overview had identified strata failure as one of six principle hazards at the colliery.
28. The need to protect against the risk of falling rock and coal when working near the face was reflected in some of the Defendants' documentation relating to other work tasks. These included:
A document developed in July 2001 entitled "Erection of Temporary Support for Cut and Weld on Plans 158, 157, 155 and 154, LW 20" which identified the risks associated with falls from longwall faces in making provision for "mesh modules overlapping lengthwise, covering the LW face opposite the plan on which the welding is to take place".
The Baal Bone Colliery Shotfiring and Explosives System referred to the need to "develop a scope of work covering such matters as support of the excavations and workings".
• The longwall 19 Standard Operating Procedures relating to "repacking and replacing sprays on shearer drum" referred to the need to "ensure roof and sides are secure".
• The longwall 19-24 Risk Assessment identified the risk of "rib/face/roof deterioration in tailgate/maingate" but then referred only to the hazard of "roof fall".
Issues relevant to the specific work area
29. The mines hazard plan of 27 August 2001 for longwall 21 identified the existence of weak ribs and poor roof at the intersection of longwall 21 tailgate and 51 cut through. The relevant area was in line with the previous longwall 20 face and goaf which situation gave rise to stress changes and degradation of the area. The need for additional support at the intersection of the longwall 21 tailgate and 51 cut through had been identified as early as 15 June 2001.
30. Reports of inspections by deputies made on 10 September and 11 September include the following:
"Rib spall along BSL, some rib spall beside BSL, areas through face breaking, roof flaking mid-face to tailgate, weak roof in places throughout the face, also new tailgate, some blockage of tailgate, care required with rock falling!, ; between the chocks".
Relevant safety documentation
31. As at September 2001 there were a number of documents at the mine which were relevant to longwall 21 and the tasks being undertaken on that date. They included:
i) The Baal Bone Colliery Safety Management Plan
ii) The Mine Inspection System
iii) The Baal Bone Colliery Strata Management Plan
iv) The Manager's Support Rules for Longwall 21
v) The Ball Bone Colliery Shotfiring and Explosives System
32. The documents did not specifically address the hazard which arose on 12 September 2001.
The Baal Bone Colliery Safety Management Plan - Overview
33. The overview document was developed to outline:
• the structure of the Colliery's safety management systems;
• provide an overview of the mine and seam characteristics;
• ventilation design, the outline of mining methods used at the Colliery; and explain the principal hazards of mining at the Colliery;
• management strategies to mitigate the potential loss caused by the principal hazards of underground mining at the Colliery;
One of the identified principal hazards was strata failure.
34. As at 12 September 2001 a Strata Management Plan had been put in place. However, the Strata Management Plan did not deal with the circumstances where work was required to be performed in the near vicinity of a longwall face.
Baal Bone Colliery Strata Management Plan - Longwall 21
35. The purpose of the Strata Management Plan was to provide a means of early detection, and to establish procedures for the management of adverse conditions that may arise during the extraction of Longwall 21.
36. The Strata Management Plan expressly identified "face horizon and gradient control" as a hazard associated with the mining of Longwall 21. The "action/response" prescribed by the Strata Plan to control that hazard was limited to cutting the roof stone and recutting the floor by adjustment of the shearer.
37. The Strata Plan did not prescribe any further action/ response beyond cutting the roof stone or cutting the floor. The strata plan did, however, authorise the Longwall Engineer, the Longwall Superintendent and the Production Manager to determine appropriate actions to recover the Longwall face. This authorisation, however, occurred in circumstances where the strata management plan did not incorporate or make reference to any system of work or standard operating procedure for the recovery of the floor horizon nor did it make any reference to the Baal Bone Colliery Shotfiring and Explosives System.
Manager's Support Rules - extraction of longwall panel 21
38. Pursuant to Section 102 of the Coalmines Regulation Act 1982 as then applied, the manager of an underground mine had to make rules not inconsistent with the Act with respect to the support of roof and sides of working places and roadways in the mine.
39. The manager, David Hetherington, prepared rules for the extraction of longwall 21 as endorsed by Inspector Carey. The rules did not extend to support of the longwall face or sides in circumstances where mining of the longwall face was suspended and persons were required to work in the near vicinity of the face. The support rules failed to provide any general guidance as to when such additional supports were required or specific guidance as to when the longwall face was required to be set with additional supports.
Baal Bone Colliery Shotfiring and Explosives System
40. As at 12 September 2001 there existed at the Colliery a document entitled "Baal Bone Colliery Shotfiring and Explosives System" ("the Shot Firing Plan").
41. The Shot Firing Plan was at no time prior to 12 September 2001 implemented or put into effect at Baal Bone Colliery.
42. At no time prior to 12 September 2001 was the Shot Firing Plan promulgated to mine workers, the mine workers instructed or trained in its contents or the provision of the Shot Firing Plan otherwise implemented.
43. The production manager, Simon Burnett, who was one of the persons charged with responsibility pursuant to the Strata Management Plan "to determine the appropriate actions to recover the longwall face" and who was in charge of the mine on 12 September 2001, considered that the Shot Firing Plan was in draft form only as at 12 September 2001 and that shotfiring operations were then carried out in accordance with the old regulations. He asserted that he had seen the draft in early 2000 but not since that time and had not, prior to being shown the Shot Firing Plan in August 2002, seen the Shot Firing Plan as authorised and signed by Mine Manager, David Hetherington.
44. Burnett asserted further that the Shot Firing Plan was reviewed by a group of mine workers including several under managers in February 2002 and as at August 2002 remained in "draft form".
45. Joe Donachie, the Longwall Superintendent and another person charged with responsibility pursuant to the Strata Management Plan to "determine appropriate actions to recover the longwall face" and who was directly below Burnett in the chain of command, was also not aware of the plan. Donachie stated that the Shot Firing Plan is not generally known throughout the mine and as at 28 August 2002 he was not aware as to the extent of availability of the Shot Firing Plan.
46. Mine Under Managers Jan Kapusta and John Field, who were charged under the Shot Firing Plan with responsibility to "ensure that all requirements of this system are met" and, when not met "ensure compliance is rectified" were not, as at 12 September 2001, aware of the Shot Firing Plan's existence. Kapusta advised that the Shot Firing Plan was made available to deputies undertaking shotfiring operations after the 12 September 2001 incident.
47. The Shot Firing Plan required at Clause 11 that prior to any shotfiring project being undertaken a full risk assessment had to be undertaken and a full scope of work developed including the following:
· "Any additional precautionary examinations
· Support of the excavation and workings"
48. Jordan, Eckford, Boyes, Bennett and Kapusta undertook an hazard identification and risk assessment of the shotfiring operation.
Steps taken immediately subsequent to the incident
49. Subsequent to the incident the Defendants implemented the following measures:
- On 12 September 2001 support of the face of longwall 21 by means of 2.5 mesh modules and butterflies
- During the nightshift on 12 September 2001 added further support by means of plastic fibreglass dowel to the face of longwall 21
- Issued a safety alert to Baal Bone Colliery staff in the following terms:
"Ground consolidation men setting to bolt longwall face
Under no circumstances is any person to work on face side of AFC spill trays or walk on the face side of AFC spill trays
Weekend Maintenance Crew
Refer to Section 63 issued by Dave Carey - District Inspector
Any person working on the face side of AFC spill trays must comply with Section 63
If working on face side, ensure temporary support is erected as a physical means of preventing risks associated with rib or roof failure."