Sept 20 (Reuters) - North American Energy Partners Inc NOA.TO :
* Announces the award of two winter earthworks contracts and further revenue diversification progress
* Has secured two substantial winter season earthworks jobs with combined value of around $90 million on 2 different oil sands mines
* Awarded a 3 year term contract, which includes a two year extension provision for potential five year total term, to provide mine support services on Highland Valley Copper Mine in British Columbia