Aug 17 (Reuters) - Subzero Group Ltd SZG.AX :
* Subzero awarded contract with BHP Billiton (LONDON:BLT)
* Contract covers all works on and offsite for the mine workshop, field maintenance and the coal handling and preparation plant
* Says total contract value in which Subzero Group will share is $20M per annum
* Selected as one of contractor providers for BHP billiton's Mt Arthur coal mine