The green light for Black Mountain Energy comes just months after Federal experts said its environmental risk assessment was "limited and disjointed" and reached "largely unsupported" conclusions.
If the US miner is found to have mined too close to a large jarrah tree, it would trigger an automatic cancellation of its right to mine much of its lease.
Chevron's Gorgon LNG project on Barrow Island began operating in 2016 has the world's largest carbon capture and storage system dedicated to emissions reduction.
WA's industrial greenhouse gas emissions are dominated by four products and a handful of companies, including a few that have managed to keep a low profile in the climate wars.
Shell's accountants predict the Dutch giant will never pay Australia for gas consumed at the Gorgon and Prelude LNG projects that it can sell for up to about $4 billion a year.
Singapore's Pavilion Energy will buy Australian LNG from Chevron with certified greenhouse emissions, in another sign that Asian buyers are favouring less carbon-intensive gas.
Gorgon LNG's carbon emissions will jump by more than one million tonnes a year until Chevron fixes an underground pressure management problem that caused WA's safety regulator to curtail CO2 injection by two-thirds.
Technical problems at Gorgon and Wheatstone will give Chevron Australia another year of reduced LNG production while US headquarters remains hesitant about the energy transition.
The WA safety regulator has told Chevron to turn down Australia's $3.1 billion showpiece Gorgon LNG carbon capture and storage system until problems are fixed, meaning carbon emissions will rise.
Gorgon LNG has emitted 7 million tonnes of climate-warming CO2 more than permitted but Chevron is unlikely to suffer at the hands of lax Australian governments.
Welders will have to grind out and redo repairs at Gorgon performed to an incorrect procedure provided by Chevron and the delay could cost up to $250M.
Chevron's problems at Gorgon LNG from faulty welds years ago in a South Korean factory continue with delays to repairing the first of three trains to be fixed.
After action by safety regulators Chevron will progressively shut down all LNG trains at Gorgon to fix faulty welds in propane-filled pressure vessels.
