True North Copper Ltd (ASX:TNC) has updated the mineral resource estimate (MRE) of its Vero copper-silver deposit in Queensland, recording a 20% rise in the ounces of silver present, with overall confidence in the resource growing, after confirmatory drilling carried out last year. The updated resource is now set at 15.03 million tonnes (Mt) at 1.46% copper and 10.59 grams per tonne of silver, with this yielding a contained amount of 220,000 tonnes of copper and 5.13 million ounces of silver in the indicated and inferred categories. On the basis of the increase in silver mineralisation, True N…