Campaigners are calling on MEPs to toughen up European rules on ‘conflict minerals’.<br /><br /> The European Parliament is set to vote on European Commission proposals to limit imports of four minerals from countries gripped by armed conflict or at risk of conflict.<br /><br /> It proposes a self-certification scheme to prove that tin, tantalum, tungsten and gold in their raw form do not come from mines in war-torn regions.<br /><br /> More than one hundred and fifty groups have signed a letter saying any scheme should be mandatory. <br /><br /> Many such minerals are used in tech gadgets such as smartphones or tablets.<br /><br /> Green and centre-left MEPs agree that an opt-in scheme doesn’t go far enough.<br /><br /> The vote on the draft will take place on Wednesday 20 May.<br /><br /> Any text voted for by MEPs will also require the approval of EU governments before it can become law.
