A preliminary report in a severe land subsidence in Co Monaghan had said that recent mining operations probably caused the disturbance.
Two further sinkholes appeared close to the GAA pitch yesterday.
In an independent technical report which was presented to Monaghan County Council, the mining company Gyproc Ireland also said that there is the possibility of further subsidence in the coming weeks as the ground settles.
An initial inspection of the site revealed a significant subsidence around 120m in diameter, close to the Magheracloone Mitchells GAA club.
Two crown holes around 8m wide have developed as a result of further settlement within this area.
Gyproc says it is confident that further subsidence will be confined to the original site of the collapse in the 120m radius zone.
The company says the report found that the recent transport and storage of water in an old part of the mine, previously unused for water storage, resulted in the collapse of some mining pillars and this is the "probable reason" for the subsidence.
According to Gyproc, the report indicates that these circumstances do not appear to be present elsewhere in the vicinity.
It says that it is conducting further investigations to ensure this is the case, and that it is continuing to liaise with the local community.
The company has also said that the families in five nearby properties remain out of their homes and are being accommodated elsewhere.
It is understood some are staying in local hotels, which Gyproc is paying for.
A spokesperson for the company could not say when the families would be returning to their homes, and said the priority is to ensure the houses are safe. A family liaison officer has also been appointed.
Officials from Monaghan County Council and An Garda Síochána met representatives of mining company Gyproc Ireland yesterday evening.
Monaghan County Council said that a number of roads are closed as a result of the subsidence, and the closures will remain in effect until mid-October.
It says that the GAA clubhouse is closed to the public, and that the site remains unsafe.
The council also said monitoring and measurement of conditions will continue over the coming days.