Martin Watkinson – Executive Mining Engineer, Simtars
ABSTRACT
The 2018 Level 1 Mine Emergency exercise held at Grosvenor mine in July 2018 is the 21st Level 1 exercise held in Queensland. This paper and presentation will provide preliminary feedback to industry on the learnings and recommendations from review of the assessor inputs.
The scenario will be explained along with the elements of emergency response that were evaluated. Some video footage will also be utilised to emphasise the learning points. Reference will also be made to the current evaluation of Level 1exercise recommendations being undertaken by the Task Group 4 evaluation team as part of the process for preparing a recognised standard on emergency response.
Dr Ian Webster – Group Engineering Manager, Ampcontrol Pty Ltd
ABSTRACT
The operation of a diffusion type gas detectors used in fixed, machine mounted and handheld applications is reliant on the natural equalisation of dissimilar gas concentrations driven by partial pressures inside and outside the detector.
Typically, this equalisation is inhibited (to a greater or lesser degree) by protective filters and barriers surrounding the fragile sensing elements from the typically harsh ambient environments. The accumulation of dust and other foreign matter on the protective filters can further inhibit the diffusion of gas into a detector.
The usual calibration process for a gas detector – typically by a ‘bump’ or ‘challenge’ test – will often fail to detect when a detector is blocked, or partially blocked. This can lead to the ‘calibrated’ detector reading high or low, but with no way to determine if that is the case.
Retrospective examination of records and equipment from Pike River Mine lead to the conclusion that critical detectors were affected by filter blockages, resulting in methane detectors reading approximately one-half of the true concentration.
This presentation explores how a blocked detector can give an erroneous reading, and what steps can be taken to avoid replicating previous mistakes.
An Interview with the last Mining Warden, Frank Windridge, by John Tate, Barrister, Crown Law
Mr Frank Windridge
Appointed as a Magistrate and Warden in 1982, Frank was the Queensland Mining Warden from 1990 to 2001.
During Frank’s appointment as Mining Warden, he oversaw the investigation of all fatalities and serious accidents that occurred in the Queensland mining industry. In particular, Frank’s contribution to advancing health and safety is best illustrated by the introduction of risk-based legislation in 1999, following his investigation and 1996 Report into the 1994 Moura No. 2 Underground Coal Mine disaster.
Frank’s continuing passion is the improvement of mine health and safety. His experience has been gained through the fatalities he has investigated, as well as through the impact he has seen on families, work mates and the industry when loss of life occurs.
Mr John Tate
John was admitted to practice law as a Barrister and Solicitor in 1981. He has practised both privately and in government in a number of Australian jurisdictions – in New South Wales, the Australian Capital Territory, Norfolk Island and Queensland.
Since 1996, John has acted as Counsel Assisting in Mining Warden’s and Coronial inquiries in virtually all mining, explosives, petroleum and gas fatalities in Queensland. Additionally, he has been retained in a range of other fatality inquiries where the primary issue has concerned hospital misadventure, aircraft failure, fatigue, or the suspicion of murder. To this point, John has acted as Counsel Assisting in over 90 public fatality inquiries.
For many years, John’s interests and experience have focused on the critical review of safety and health management and training systems, on accident investigation methodologies, and on compliance issues. Reflecting this, he is frequently engaged as a speaker in public forums and conferences.
Simon Worland – Occupational Hygienist
ABSTRACT
Use of compressed air to blow out or “clean” electrical cabinets is a routine maintenance task across the Queensland Coal Industry. Elevated levels of harmful dust can engulf the blow out operator for extended periods and increase the risk of developing lung diseases including Coal Workers Pneumoconiosis and silicosis.
In 2017 the Queensland Mines Inspectorate reported that approximately 50% of all respirable dust and Respirable Crystalline Silica (RCS) exceedances in surface coal mines was directly related to the use of compressed air for cleaning down enclosures and equipment during maintenance activities.
Respiratory protection has historically been viewed as the primary control to protect the health of blow out operators as dust controls at the engineering level or above have not been considered to be feasible.
Blow out of electrical cabinets on Komatsu 960E haul trucks have been targeted for an engineering dust control project at Hail Creek Mine. The project has focussed on the following areas:
• Sealing of cabinets
• Application of positive pressure
• Local exhaust ventilation / vacuuming
• Identification of alternative cleaning methods
• Measurement of control performance
This paper describes the dust control project along future direction for application of common principles to other equipment such as draglines and excavators.
