Middle Island Resources Limited announced that it has received positive results from pit optimisation of the Wirraminna deposit Mineral Resources. The Wirraminna deposit is located immediately adjacent to the company's 100%-owned Sandstone gold project in WA and within 1km of the gold processing plant. Middle Island declared a JORC 2012 compliant Mineral Resource estimate of 550,000t at 1.3g/t Au for 23,000oz gold at a 0.5g/t Au lower cut-off grade for Wirraminna in December 2017. Open pit optimisations using Whittle software were completed by Mining Focus Consultants Pty Ltd. The December 2017 Mineral Resource model (total resources) was optimised at a base case gold price of AUD 1,600/oz, utilising other input parameters derived from the December 2016 Sandstone project Pre- Feasibility Study. At a gold price of AUD 1,600/oz the optimal pit shell, based on the maximum undiscounted operating cash flow, includes 72,000 t at a grade of 1.97 g/t gold for a strip ratio of 9:1. This equates to a mill recovered 4,200 oz of gold. This pit shell depth is to a maximum of 45 m from surface and hence is wholly contained within the oxide zone.