Discovery of a Blind Gold Deposit via 3D Geology Model Targeting, Kalgoorlie, Western Australia.
The Central Kalgoorlie 3D modelling project was a collaboration between geologists from Model Earth Pty Ltd, Geoscience Now Pty Ltd (both formerly Jigsaw Geoscience Pty Ltd) and KCGM, in late-2009. The resultant Central Corridor 3D model is the first geological model built for Central Kalgoorlie that integrates historic and newly generated geologic data into a representative, functional and queryable 3D model. The fundamental tenet of this model is that it honours the data. The driving force behind construction of this 3D model is the need to be predictive about exploration targeting. The model integrates geology, alteration, structure, mineralisation and physical property data from both surface, pit, underground and drill core. The 3D model was delivered in mid 2010. Drilling of the first target (Town Fault target) began in early-mid 2011 with an intersection of 71.38m @ 4.99ppm Au returned in UNGD015 (Barrick Gold Investor Day presentation, 7 Sept 2011) early in its discovery. The Town Fault Target was reassigned Hidden Secret to due proximity of this historic mine, however they are unrelated. Drilling was ongoing from surface and underground throughout 2011, 2012 and into 2013. In September 2014, KCGM announced the discovery of the Hidden Secret resource of 76,000oz (0.66Mt @ 3.56ppm Au) (http://superpit.com.au/publications/information-sheets/). EPA approval (https://consultation.epa.wa.gov.au/seven-day-comment-on-referrals/kcgm-hidden-secret-project) for development of the Hidden Secret mine was granted in April 2015 with the orebody planned to be mined as an underground operation from Mt Charlotte over a period of 2 years.