Two more mining companies have been targeted in drug raids in Western Australia's Pilbara region.
BHP Billiton and Rio Tinto worked with police who searched people arriving on site by plane, as well as at Newman Airport.
The searches on Wednesday, Thursday and Friday are part of an ongoing initiative to target illicit drug distribution and use in regional WA.
It followed raids involving Fortescue Metals Group in December.
Commander Murray Smalpage says police and the industry have a shared interest in removing drugs from work sites.
"From our perspective it is about law enforcement and community protection, and for industry members it is about the health and safety of their staff," he said.
"A person under the influence of illicit drugs isn't just a danger to themselves, they are a danger to their workmates and they are a danger to the community they work in."
Police say more operations will be held in the future.
Heavy haulage vehicles travelling through Wubin were also targeted over three days and involved inspections, random breath tests and drug tests.
Police said 544 random breath tests were conducted, with 200 of them on heavy haulage truck drivers who were also drug tested.
Four people had formal drug tests done after initial positive indications, with one driver testing positive for cannabis and two testing positive for methylamphetamine.
The fourth person returned a negative result on the formal test.
Police also issued 16 work orders, 32 cautions and 23 infringement notices.
Four people were also found to be driving without a licence.
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