The board of directors of Goa Carbon, which met today, approved a proposal to issue shares on rights basis.According to a release issued by the company to the BSE today, the rights issue in the ratio of 1:1 will be priced at Rs 80/- per share (i.e. Rs 10 each paid up share at a premium of Rs 70 per share).The stock had closed at Rs 149 on the BSE on Friday.