Legislative Assembly Hansard 1982
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Queensland Parliamentary Debates [Hansard] Legislative Assembly TUESDAY, 19 OCTOBER 1982 Electronic reproduction of original hardcopy Papers' 19 October 1982 1455 TUESDAY, 19 OCTOBER 1982 Mr SPEAKER (Hon. S. J. Muller, Fassifern) read prayers and took the chair at 11 a.m. PAPERS The following paper was laid on the table, and ordered to be printed:— Report of the Department of Commercial and Industrial Development for the year ended 30 June 1982 The following papers were laid on the table:— Regulations uhder— PubUc Service Act 1922-1978 Art Unions and Ainusements Act 1976-1981 PubUc Trustee Act 1978-1981 Banana Industry Protection Acts 1929 to 1937 Margarine Act 1958-1982 ; Primary Producers' Organisation and Marketing Act 1926-1981 ' Sugar Experiment Stations Act 1900-1981 Wheat Pool Act 1920-1979 and the Primary Producers' Organisation and Marketing Act 1926-1981 Regulations to be observed on the appointment of Queen's Counsel Orders in CouncU under— Metropolitan Transit Authority Act 1976-1979 and the Statutory Bodies Financial Arrangements Act 1982 Industrial Development Act 1963-1981 Supreme Court Act 1921-1979 Harbours Act 1955-1982 Port of Brisbane Authority Act 1976-1982 Agricultural Bank (Loans) Act 1959-1981 Agricultural Bank (Loans) Act 1959-1981 and the Statutory Bodies Financial Arrangements Act 1982 Banana Industry Protection Acts 1929 to 1937 Primary Producers' Co-operative Associations Act 1923-1981 Electricity Act 1976-1982 and the Statutory Bodies Financial Arrangements Act 1982 1456 1» Oc.<*er 1982 ^m^i S...««„ Forestry Act 1959-1982 ^^^1982^''* ^^^^"^^^^ *"** ^''^ Statutory Bodies Finandal Arrangements Act Farm Water Supplies Assistance Act 1958-1979 By-laws under the Dental Act 1971-1973 Reports— Queensland Trustees Limited for the year ended 30 June 1982 Bureau of Sugar Experiment Stations for the year ended 30 June 1982 MINISTERIAL STATEMENT Radioactive Mineral Sands Hon. B. D. AUSTIN (Wavell—Minister for Health) (11.5 a.m.): A number of the more dense minerals in beach sands have economic value and in this country, particularly the eastem coast, these dense minerals have been concentrated to the' extent that extradion is economically viable. The minerals extracted, usuaUy referred to as heavy minerals are— (i) RutUe (Tetanium Dioxide) (ii) Zircon (Zirconium SiUcate) (iii) Ilmenite (Iron-Tetanium Dioxide) (iv) Monazite. The usual practice is to produce heavy mineral concentrates at the beach sand-mming sites and transport them to separation plants or dry mUls for separaticui and concentration into commercial concentrates. The separation process relies on the differing physical properties of the heavy minerals. The monazite is initiaUy coUeded as a magnetic, non-conductor component mixed with other materials, including magnetic zircon This semi-processed component may contam 10 to 14 p)er cent monazite as compared with .01 per cent in the original beach sand. The semi-processed component may be further processed to yield a component with up to 50 per cent monazite, which can be further processed as required to yield soluble concentrates of 70-90 per cent monazite. The beach sand-mining industry has been estabUshed on the east coast of Australia since 1934 (at Byron Bay), and has subsequently extended to other locations in New South Wales and (Queensland. The possibility therefore exists that dumps of semi-processed material containing 10 per cent or more of monazite may be located near shes where dry miU operations have been carried out. Over the past 10 months, surv^s of sand-mining sites and processing plants in South-east Queensland have been made by officers of my department. Six sites were surveyed. Three were in operation or are still in operation. Varying problems were found with each particular site depending on the extent of the original sand-mining separation process. Many of the heavy metals present in the sand had been separated and removed. Some of the material which was left contained various levels of monazite. The radiation levels from this material varied according to the concentration. It is these radiation levels which have been matters of concern and on which the National Health and Medical Research CouncU has made recommendations. In respyect of places which are intermittently occupied by members of the public, such as sporting fields and footpaths, the recommended maximum is 2.5 micro-sieverts per hour. In respect of residential land, the exposure set by the National Health and Medical Research Council is .1 of a micro-sievert per hour. The Consolidated Rutile Limited plant at Meeandah was surveyed. Two stockpiles of some processed mineral and a store of bag monazite were located and surveyed. All monazite in that plant is located well away from areas which are accessible to the public. The radiation levels in the vicinity of the stockpUes and the bag stores are acceptable and are at present no hazard to members of the pubUc or plant operators. It was recommended that no remedial action was required in respect of that plant. The Associated Minerals Consolidated Limhed plant in Ferry Road, Southport, has been extensively surveyed over a period of nine months. There are a number of sites on which material has been tested. It is understood that the company is winding: up its operation Ministerial Statement 19 October 1982 1457 and is looking for ways of removing the offending material so that the sites can be sold for residentml development. Discussions have taken place with the company with respect to the removal of the offending material and hs being buried under controUed conditions to a depth of at least one metre and covered vrith an appropriate solid fill. If these procedures are carried out, the sites owned by this company may then be sold for residential development. A survey of the mineral sand processing plant at South Currumbin has recently been carried out. One grass mound was found to have radiation levels above the acceptable level and two smaller mounds had radiation levels below but close to the acceptable levels for recreation areas. The material in those three areas has been removed and deposited in a safe and acceptable manner. In an industrial area in Maryborough, a sand-mining processing plant had previously been in operation. It ceased some years ago and the property was sold to another commercial company not involved in mineral sands activities. The she has been surveyed and the area that is occupied by the present commercial company does not provide any hazard, but there is an adjacent area which was used to stockpile some processed sand, and that area demonstrates significantly high levels of radiation. Recommendations are being made as to how that site can be handled, and this will probably involve more adequate fencing and the stabilising of the sand on site. Discussions are to take place with the present owners of the site. Now it has come to the notice of the department that some of the processed sand has been sold to householders in the Brisbane area for land fill. I have already advised the pubUc of this fact and asked for people who have had sand fill placed on thdr property to come forward so that appropriate tests could be carried out. Tests carried out on a number of properties at the request of the owners in the past months have demonstrated that there is no hazard and in fact in a significant numbers of cases the background radiation was higher than the radiation level coming from any sand deposited on their residential site. In one instance, in a large garden setting there were a few small peripheral sites where radiation was on the upper level as set by the National Health and Medical Research CouncU, and on another site the radiation level was significantly higher than the standard set. These householders have been advised, and I understand that the one whh significantly higher levels has taken remedial action. The extent of the distribution of this material in the south-east comer of the State is not known. Records are very inadequate. Companies that have been involved in distributing the material have been co-operative but have been unable to provide definitive information. The only way to get some idea of the extent of the problem is by asking members of the public who have had sand delivered for land fiU purposes to bring this to the notice of my department. It is pointed out that the testing and the surveys that are required are time-consuming and require highly skilled scientific staff. The health aspects of this problem have two components. First is the effect on individual members of the public and, secondly, the workers associated with industrial plants. Over the years, workers in mineral sands processing plants have been the subject of industrial medical supervision, and these plants have operated satisfadorily from that point of view. These monitoring arrangements will continue and are directed by my Division of Industrial Medicine. The effect on members of the public has only become significant since the discovery that some of the material has been used on domestic premises for land fill. The levels that have been obtained from surveys of residential premises would indicate that the risk to health is minimal. At one residential site it was felt that the levds did present a demonstrable risk, and action has been taken by the owner of that property to remove the offending material. The health problem generated in this context would be one of 10 to 20 year duration and therefore the immediate effects are negligible. But some risk does exist in the long term where significant levels of radiation are present. On the present information available, it is not anticipated that there will be very many residential sites which would have levels above the recommended National Health and Medical Research C!ouncU levels and therefore require remedial action.