Sept 7 (Reuters) - Westgold Resources Ltd WGX.AX
* Added 15,000 ounces of short dated deliveries for September through December 2017 at gold price of A$1,656.3 per ounce
* Westgold agreed with Citibank to extend gold-prepay by a further 18 months adding 22,500 ounces
* Pre-pay will add an immediate $36.15 million in cash to working capital position of company