Sandfire Resources Limited announced that step-out drilling at the A4 Dome, located 8km west of the Company's Motheo Copper Mine in Botswana, has returned an outstanding high-grade vein-hosted copper-silver intersection some 1.2km to the south- west of the current A4 Deposit Mineral Resource envelope. The new intercept, in diamond hole MO-A4-207D, is located on an interpreted structure with minimal previous drilling which potentially opens up an exciting new area for exploration in close proximity to the recently updated A4 Mineral Resource. MO-A4-207D is located approximately 1.2km south-west of the western end of the A4 Mineral Resource. A revised Mineral Resource for the A4 deposit was announced on 21 July 2021 comprising 9.8Mt at 1.4% Cu and 21g/t Ag for 134,000t of contained copper and 6.6Moz of contained silver (using a 0.5% Cu cut-off). Work is well progressed on a Pre-Feasibility Study and maiden Ore Reserve estimate, due for completion in the September quarter 2021, and a Feasibility Study for an open pit mine development is expected in the March quarter 2022. The mineralisation in MO-A4-207D occurs as coarse to semi-massive, bornite and chalcopyrite within multiple brecciated quartz-carbonate veins, with additional copper sulphides disseminated along bedding planes. The intersection is hosted by a sequence of sandstone and siltstone units within the Lower D'Kar Formation, approximately 250m above the Ngwako Pan Formation (NPF) contact. Importantly, MO-A4-207D is the first hole to effectively test the axis of the A4 periclinal anticline (A4 Dome) interpreted from AEM data to the southwest of the current Mineral Resource. Similar vein- hosted copper-silver mineralisation was reported by MOD Resources in 2018 up to 1.9km northeast of MO-A4-207D and approximately 100m south of the A4 Mineral Resource.