Customs Tariff amendment adds new classification imposing duty on other aluminium ores and concentrates under Customs Tariff Act. An insertion into the Second Schedule to the Customs Tariff Act creates Sl. No. 23C, classifying tariff item 2606 00 90 as 'Other aluminium ores and concentrates' and prescribing an ad valorem import duty rate of 30%, thereby establishing a distinct tariff classification and duty for imports of those commodities.