About 85 safety and compliance inspectors are expected to conduct unannounced inspections at coal, metalliferous and quarrying operations across the state, including the Hunter Valley.

"Annual compliance blitzes are an integral part of the NSW Resources Regulator's strategy to ensure compliance with work, health and safety laws and the Mining Act by miners operating in NSW," chief compliance officer Anthony Keon said.

"Inspectors will be targeting site safety systems and will have a particular focus on the effectiveness of supervisors in ensuring compliance with safety regulations among workers.

"Inspectors will also be assessing mine rehabilitation required under the Mining Act.

"We want the community to be confident NSW has a safe and responsible mining industry and compliance operations such as this show how we're achieving this.

"They also serve as a strong reminder that operators must remain vigilant and should constantly review their operations to ensure their obligations to workers and the community are met."

Inspections will be held at sites across NSW from Monday, June 17, to Friday, June 21.

The regulator will release the results of the compliance operation in early July.