§ Mr. Roy Mason
asked the Paymaster-General to what extent experiments are being conducted in the use of waste from coal mines for the development of a cheap source of aluminium and iron; and if he mill make a statement on the progress and prospects.
§ Sir I. Horobin
Waste from British coal mines rarely contains more than 20 per cent. of iron and 15 per cent. of aluminium and it would be quite uneconomic to attempt the extraction of these metals from such a source.