Emerald Resources NL (ASX:EMR)– whose main focus is gold exploration and mining in Cambodia – has increased its underground resource at the Okvau gold mine in the country’s Mondulkiri Province by 105,000 ounces to 2.13 million tonnes at 6.00 grams per tonne (g/t) of gold for 410,000 ounces. This brings the overall resource at Okvau to 12.53 million tonnes at 2.40g/t for965,000 ounces, with this also comprising an open pit resource of 10.40 million tonnes at 1.66g/t for 555,000 ounces. Located around 265 kilometres northeast of Phnom Penh, Okvau has been mined via an open pit operation, with 32…