Occupational noise-induced hearing loss in platinum miners: what do the data tell us?

Background: Occupational noise-induced hearing loss (ONIHL) is one of the most common occupational health diseases affecting miners in South Africa. Accurate and appropriate medical data are essential for making valid diagnoses. Objectives: The purpose of this study was to describe the electronic records of a South African platinum mine's audiometry medical surveillance system and their role in early diagnosis of ONIHL. Ear-related conditions of affected miners, occupations, and noise levels were concurrently reviewed, and the characteristics of miners with and without ONIHL were described. Methods: This was an analysis of secondary data from the electronic audiometry and employee occupational records of 305 platinum mine workers for the period 2014 to 2017. Data were analysed using descriptive statistics. Results: Although the audiometry records contained appropriate and relevant data, including annual hearing screening percentage loss of hearing (PLH) shifts, there was evidence of inaccurate and insufficient recording of risk factors for hearing loss in the medical surveillance records. The records indicated that the miners in some occupations were exposed to dangerously high noise levels, exceeding 85 dB(A). Miners as young as 21 years of age were diagnosed with ONIHL. Conclusion: The insufficient and inaccurate data captured in the miners' records has important implications for the mine's efficient implementation of hearing conservation programme (HCP) elements aimed at mitigating ONIHL. The hazardous noise levels recorded call for increased attempts to meet noise level regulations, while the presence of conditions such as pseudohypacusis highlights the need for exploration of more reliable assessment measures

The Use of Hearing Protection Devices in South Africa: Exploring the Current Status in a Gold and a Non-Ferrous Mine

This study investigated mine workers' current use of hearing protection devices (HPDs) in South African gold and non-ferrous mining subsectors. A descriptive study design was employed using structured interviews.Ninety participants were interviewed. Descriptive statistics and the chi-square test were used to analyse data.All participants reported wearing HPDs; with custom-made earplugs being preferred by those with more years of work experience and used by those most at risk to noise exposure. Comfort; design and work-related communication were factors infl uencing use of HPDs. Relationships between participants' demographic factors and use of HPDs were not statistically signifi cant. Participants seemed reasonably aware of HPD importance which highlights progress. Findings further highlight the importance of occupational audiologists in improving hearing conservation programmes (HCPs) in this sector