100% ore! Avg 40g/t Au 1km x 200m to EOH all holes, OP mining 2019, page-323

Good read from 2006 about the discovery of Olympic Dam in 1975. More history in the making happening right now at Ema and TE.

The initiallow-grade copper discovery in drillhole RD (Roxby Downs) 1 in July 1975. The mine opened in 1988. 13 years of exploration and development, mainly because it's an UG deposit. Our Olympic Dam will take about 3 years from discovery to the commencement of mining.

"The finding of a higher gradesection of the orebody took more than a year torealize, following a sequence ofeight drill holes, seven of which defined low gradecopper mineralization."

"The history spans five years of activemetalliferous mineralsexploration, and its recollectionstill generates excitement. It is a history with manyimplicit lessons, the chief of which is theimportance of mentoring, multidisciplinaryteamwork, enthusiasm, scientificcuriosity, and persistence."

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.457.4613&rep=rep1&type=pdf