The NADSAQ-listed miner is offering an exchange of up to $31.7 million aggregate principal amount of its 10% convertible senior notes due 2018 for any and all of its outstanding 4.5% convertible senior notes due 2015.

It is also offering an exchange on up to $22.7 million aggregate principal amount of the 10% convertible senior notes due 2018 for any and all of its outstanding 3.125% convertible senior notes due 2018.

The exchange offer was meant to expire on September 11 but has been extended to 5pm, New York time, on September 18.

US Bank National Association, the exchange agent and information agent for the offers, advised the company that as of 5pm on September 11, tenders of approximately $3.6 million aggregate principal amount of the existing 2015 notes and $38.5 million aggregate principal amount of the existing 2018 notes had been validly tendered for exchange and not withdrawn.

The exchanges represent approximately 7% and 75% of the existing 2015 notes and existing 2018 notes respectively.

Except for the extension of the expiration date, all other terms of the exchange offers are unchanged.