During 2016/17 open pit mining by Excelsior Gold concentrated on the Zoroastrian system where gold mineralisation is hosted in quartz veins and stockwork zones within the differentiated Zoroastrian Dolerite. The quartz veining has been defined over a strike length of 1.4 kilometres and remains open below a vertical depth of 380 metres. The high gold grades associated with the stockwork and narrower vein style mineralisation demonstrates excellent potential for the delineation of further open pit and underground resources.
Mining of the Zoroastrian open pit by Excelsior to a depth of about 110 metres below surface produced approximately 55,000 ounces from 810,000 tonnes of ore grading 2g/t Au and was treated at the nearby Paddington plant and Golden Mile Milling’s Lakewood plant.
Isometric view of Zoroastrian deposit (looking down towards the NE) of wireframe interpretation of main lode systems
The new interpretation of the distribution of mineralisation within the Zoroastrian Dolerite and the adjacent sediment contact provides a template for the assessment of other prospects along the 13 kilometres of strike of the dolerite unit within the Project tenements to the south of the open pit and in other parallel dolerite horizons.