Big gold inventories guarantee their owners exposure to the metal’s inevitable highs, as well as the lows, hence they usually form part of the portfolios of large companies. Wiluna Mining Corp (ASX: WMX), looking to build a significant, profitable gold factory on a world class resource at Wiluna in the middle of Western Australia, is not a large company today. But executive chairman Milan Jerkovic says it has the platform to propel it into the mid-tier space populated by other Yilgarn leaders that have emerged in the past decade.