SYDNEY (BLOOMBERG) – Resources giant Glencore is expanding a coal mine in Australia that scientists have estimated leaks so much methane each year it has the same global warming impact as the annual emissions from millions of cars.
New activity at the Hail Creek Mine involves digging up coal from gas-rich seams through surface mining – an approach for which the company has said there’s no reliable way to halt fugitive methane from escaping during operation.
Steep declines in the dirtiest fossil fuel are needed to meet global climate goals, and activists argue curbs should prioritise the worst methane-spewing mines.
“If coal mining companies continue to argue that fugitive methane management is too hard for open-cut coal mines, then the obvious and material solution is to cease opening new mines,” said Naomi Hogan, strategic projects lead with Australasian Centre for Corporate Responsibility. “And for the known very gassy mines to seriously consider early closure options.”
Methane is the primary component of natural gas but it’s often produced alongside oil and coal. The invisible, odourless greenhouse gas is extremely potent and traps more than 80 times the heat of carbon dioxide during its first 20 years. Halting leaks and intentional releases of the gas from fossil fuel operations are viewed as some of the lowest hanging fruit in the fight against climate change.
New surface mining activity is visible in satellite observations of the mine’s northeast corner, an area for which the mine got approval to expand when it was majority owned by Rio Tinto Group. Rio sold its stake in the mine in 2018 to Glencore, which declined to comment for this story.
An environmental authority amendment application, made in 2014 and approved the following year, for the northeast expansion area on file with Queensland authorities also suggest the site’s coal seams have a high methane content. The document, which sought approval for both new surface and underground mining activities, explains how extensive work would be needed to clear the flammable gas for a potential underground expansion to make it safe for workers.
“Given the gaseous nature of the target and deeper underlying coal seams, it is anticipated that drainage of gas prior to, during and after mining activities would be required,” according to the amendment application. The document was obtained by the ACCR through a freedom of information request and shared with Bloomberg News.
An environmental authority permit that went into effect March 15 for the Hail Creek mine makes no mention of the methane content of its coal seams.
Geologically older, deeper coal deposits typically contain more methane than shallower seams near the surface. Yet, satellite observations are shedding new light on the climate impact from open-cut mines. There are well-known approaches for capturing methane from underground mines through boreholes or ventilation systems, but Glencore told the Financial Times this month there are no practicable technologies or methods for capturing fugitive methane emissions from operating surface mines.
That’s particularly problematic for open-cast coal operations in Queensland’s Bowen Basin, in which Hail Creek mine is located, and where satellite data suggests the geology is particularly gaseous. For every tonne of coal produced in the region an average of 7.5 kilograms of methane is released, according to an estimate using satellite observations from French geoanalytics Kayrros last year.
That’s roughly 40 per cent higher than global levels, based on data from the International Energy Agency. The age of coal is the same across a seam, according to Christian Lelong, director climate solutions at Kayrros, who also has experience working in Australia’s mining sector. Deep coal seams with sufficient incline can get close enough to the surface to be accessible through surface mining.
“If the coal seam is gassy in an underground mine, the same coal seam will also be gassy if the mine is open-cast,” he said.
Glencore also filed an additional exploration permit linked to Hail Creek in June 2020 that is still being assessed by the Queensland government. That’s raised red flags for environmental groups concerned that more coal mining activity threatens Australia’s 2030 emissions reduction targets and its 2050 net zero pledge.
“We have significant public interest concerns with respect to this exploration application,” said Carmel Flint, a coordinator for Lock the Gate Alliance, a climate activist group. “Particularly due to the extremely high emissions recorded from the existing mining operations and the incompatibility of further exploration and expansion activities with Glencore’s climate change and emissions reductions commitments.”
Glencore is targeting a 15 per cent reduction in its emissions by 2026 and a 50 per cent cut by 2035, from 2019 levels. It’s also promised to cap coal production and slowly curtail output until closing the mines by 2050, but the company has given little detail about those plans and how quickly the mines will be phased out.
It’s also unclear how those plans could be disrupted if the company’s Australia reserves are emitting far more methane than what is reported. Glencore has leaned into coal production even as many of its rivals have exited the sector amid concern over the fuel’s contribution to climate change.