Koba Resources (ASX:KOB) said the first phase of drilling at the Mt. John prospect at its Yarramba uranium project in South Australia intersected significant mineralization, according to a Thursday Australian bourse filing.

It said an initial 11 holes were drilled and significant drill results include an intercept of one meter at 397 parts per million grade of triuranium octoxide from 104.4 meters, the filing said.

It said it will continue drilling at the prospect in February with a further 20 holes planned.

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