Dec 19 (Reuters) - Duet Group DUE.AX :
* DBP Development Group confirms that it will build largest gas storage facility in Western Australia
* Citic Pacific Mining Management to be foundation customer, under a 10-year gas storage agreement with options for a further 5 years
* Estimated total construction cost of $69 million, to be funded by $38 million of Duet's corporate working capital; balance from DDG's bank debt facility Source text for Eikon: Further company coverage: DUE.AX