RABAT, Oct 11 (Reuters) - Morocco's biggest miner Managem MNG.CS has bought a 40 stake in Avocet Mining Plc's AVM.L Tri-K gold mines in Guinea for an undisclosed amount, a statement from the Moroccan company said on Tuesday.

Managem said it will raise its stake to 70 percent of the Tri-K project, located near Kankan in the northeast of the country, if confirmed reserves reach 30 tonnes in a second phase. The company will only raise it to 60 percent stake if confirmed deposits are less than 30 tonnes of gold.

(Reporting by Aziz El Yaakoubi; editing by David Clarke) ((aziz.elyaakoubi@thomsonreuters.com; +212623934595)(;))