Great Boulder Resources (ASX:GBR) has reported its recent 13 drillhole aircore campaign has confirmed gold mineralisation across 400m of strike at Mulga Bill North. The company reported the following batch of data on Tuesday: 17m @ 1.4g/t gold from 49m depth14m @ 1.75g/t gold from 70m depth13m @ 2g/t gold from 136m depth5m @ 3g/t gold from 140m depthThese results will go towards upgrading a mineral resource estimate (MRE) already in place for Mulga with another target called Saltbush to be investigated further down the line. Back at Mulga, RC and diamond tipped drill rigs continue to sniff awa…