MANILA, May 13 (Reuters) -

Gold miner OceanaGold Philippines Inc's shares fell

as much as 6% below their initial public offering (IPO) price in

the first 15 minutes of trading on their market debut on Monday.

The shares opened at 13.34 pesos ($0.2314) a touch above

their IPO price of 13.33 pesos, but subsequently lost ground.

Toronto-listed miner OceanaGold Corp ( OCANF ) sold 20% in

subsidiary OceanaGold Philippines via an 6.078 billion pesos

IPO, the first listing in the Southeast Asian nation this year

and the country's first public debut for a mining firm since

2012.

The gold and copper miner conducted its IPO to comply

with a regulatory requirement for its operations in northern

Philippines.

OceanaGold's ( OCANF ) Didipio mine started commercial operations

in 2013 and has a mine life of up to 2035.

($1 = 57.64 Philippine pesos)