Introduction: work-related musculoskeletal complications are one of the causes of disability and risk factors such as manual handling and repetitive work can cause or exacerbate these disorders. Considering the fact that in the industry, people with a wide range of risk factors for these disorders and high mental health are facing, this study was designed to investigate the position of work posture and mental load and their relationship with the operating personnel of Sarcheshmeh copper.
Method: In this descriptive cross-sectional study, 220 individuals were selected randomly from a population of 800 people based on the demographic distribution of the units and the field study of the working areas. Data were collected using demographic, Nordic and NASA mental workload index and QEC software. SPSS software was used to analyze the data.
Results: In this industry, due to the nature of work, the prevalence of musculoskeletal disorders was high in at least one region of the subjects. The prevalence of these disorders was related to the area of rest and back (38.6%) and back (38.2%) and The least of them was one or two females (2.3%) and there was a significant relationship between the mean total burden of mental health and the risk level and prevalence of disorders (p <0.05).
Conclusion: Due to the high risk of the occurrence and prevalence of musculoskeletal disorders and its relation with individual characteristics such as age and work experience and mental labor, it is necessary to control and reduce these disorders and the level of risk by implementing engineering controls such as mechanical appliances and tools. They stepped up and, with interventions such as a job rotation program, with the age and work experience of individuals, they were employed in jobs with different mental and physical needs that involve various muscle groups
 

Keywords: Posture, Mental workload, musculoskeletal disorders, Risk level

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