Sorry folks but just a bit confused, they say a "target" of...

Sorry folks but just a bit confused, they say a "target" of 480-790k oz, so are they aware they have not yet achieved 480 oz or they just dont know until more drilling is done, but then this line is confusing where they say they are unsure if more drilling will result in the estimation of an MRE?, this needs clarification.
##Exploration Target Basis The potential quantity and grade of the Exploration Target is conceptual in nature and as such there has been insufficient exploration drilling conducted to estimate a Mineral Resource. At this stage it is uncertain if further exploration drilling will result in the estimation of a Mineral Resource. The Exploration Target has been prepared in accordance with the JORC Code (2012).##