NSW Health's investigation into a possible cancer cluster on Tweed Valley Way, Mooball, has continued.

Tweed Heads GP Dr Paul Malouf called on residents to submit their medical histories to the region's chief scientist at a recent town meeting.

Cancer cluster fears after more than 20 deaths

Mooball labourers 'lay' in radioactive tailings

Experts will probe cancer cluster

Dr Malouf has been asked to assist with gathering the medical data for the Northern NSW Local Health District following his calls for an investigation into a group of about 28 residents, who all live on the same street and have developed cancer - some dying in their teens.

Residents fear that radioactive tailings from past sandmining operations, used widely to prop up houses and garden beds, or other soil contamination, are contributing factors.

Dr Malouf said eight members of the community attended the Mooball Residents' Association last Saturday at the Victory Hotel on Tweed Valley Way to progress the paper work necessary for health authorities.

It has been decided by the Residents' Association that a letter will be sent to the community - asking for the ages, date of cancer onset or death - if residents are filling out information on behalf of a loved one.

Residents are asked to send that information back to the Health District, where the chief environmentalist will record the data. A decision will then be made into whether or not the investigation will proceed.