Job losses have already begun in the opencast mining industry and companies which supply plant to deep pits are facing closure.Now transport union TGWU construction secretary George Henderson is seeking urgent talks with trade and industry secretary Michael Heseltine to discuss the cuts.Civil engineering contractors and plant hirers involved in deep mining operations are also laying off workers, and Mr Henderson fears the redundancies could run into thousands.He is also up in arms that TGWU members are being sacked without the statutory 90 days notice period.Mr Henderson said: 'When the pit closure plans were announced I warned there would be a snowball effect in the opencast industry.''That is happening quicker than expected. And other industries like civil engineering contractors and plant and machinery manufacturers are also being hit.'TGWU officials have already reported 120 redundancies in the Yorkshire area.And many firms are known to be reluctant to speak out against the situation for fear of losing their remaining contracts with British Coal.Mr Henderson said: 'These workers are being hit with a double blow. Not only do they face losing their jobs, but employers are also disregarding the law when it comes to 90 day consultation periods over redundancies.'I am now seeking talks with Mr Heseltine and leaders of British Coal as a matter of urgency.'