He says the UK‑run Mining Remediation Authority has a “moral obligation” to act quickly.
Residents of the former mining village remain in temporary accommodation or with family and friends after they were ordered to leave their properties last month over concerns about unsafe structures linked to suspected ground movement.
They have since been told it will take a further eight weeks for the Mining Remediation Authority (MRA) to establish the cause of the problem and decide what happens next.
Speaking to the Press Association, Mr Gray said he had “significant concern” about the extended timescale and the impact it will have on evacuees.
He has now pressed UK ministers to do more to ensure the UK‑controlled MRA, which is leading the site investigation work, reaches a decision as quickly as possible.
He said: “This continues to be a very distressing situation for the residents.
“I have expressed to the Mining Remediation Authority my significant concern that its investigations will take at least another eight weeks to find the source of the ground movement, due to the impact this will have on so many households.
“The MRA’s decision is absolutely critical to plot the route forward for the residents so I made clear to them that they have an absolute responsibility and moral obligation to take this decision as quickly as possible.
“Given the MRA is a public body under UK Government control, I have written to the UK Energy Secretary to ensure he is taking all possible actions to ensure the investigations are being carried out as quickly as possible.
“The Scottish Government continues to regularly meet with Clackmannanshire Council to provide support where it is required.”
The intervention comes after Prime Minister Sir Keir Starmer told MPs the MRA was carrying out “daily investigations” in Coalsnaughton and that the UK Government was working with Clackmannanshire Council to support affected residents.
Almost 100 properties have been evacuated since May 18, with local resilience partners saying their “priority” remains the safety and welfare of everyone affected.
Officials have warned it will be at least another two months before residents receive answers on the cause of the ground movement and what it means for their homes.
The outcome of the MRA’s work is expected to determine whether properties can be repaired and reoccupied or whether longer‑term options will have to be considered.
Mr Gray said the Scottish Government would continue to engage with the council and local representatives while the investigation continues.
He also stressed that responsibility for the mine‑related investigation lay with the MRA and the UK Government, and that residents deserved clarity as soon as possible on their future.