South Perth-based oil and gas producer Cooper Energy Ltd has acquired a 6.6 per cent stake in Sydney-based oil and gas company Mosaic Oil NL for $5.1 million, the company announced today.

South Perth-based oil and gas producer Cooper Energy Ltd has acquired a 6.6 per cent stake in Sydney-based oil and gas company Mosaic Oil NL for $5.1 million, the company announced today.