The company was sentenced in Melbourne Magistrates Court on Monday after pleading guilty to the single charge of failing to provide and maintain a safe working environment that was without risk to health and safety.
WorkSafe Victoria charged Boral after investigating work practices at its Montrose quarry in Melbourne's east in 2018 and 2019.
WorkSafe found on October 4, 2018, and October 1 and October 10, 2019, workers were exposed to deadly silica dust that was generated from processing the quarry rock.
Boral failed to ensure five workers were wearing respiratory masks appropriately while working at the site on those days, Magistrate Carolyn Burnside said in her sentencing remarks.
Ms Burnside convicted and fined the company $180,000.
High levels of silica are found in engineered stone, commonly used in kitchen benchtops, and the dust it produces has been linked to the incurable lung disease silicosis and cancer.
An estimated 600,000 Australian workers have been exposed to silica dust generated through mining, construction, building and manufacturing.
Safe Work Australia is investigating a national ban on products using silica.
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