Ann: Investor Update Presentation - January 2019, page-6

Great points MIStragic however one point overlooked is that SAR holds significantly more ground and has a "real" exploration approach with new development adding to inventory via greenfields discovery, whereas SLR have not found anything new since IGR was acquired, although hats off to the Brownsfield team for the continual development of Daisy.
The other key point to recognise is that SAR has TWO mills and is not beholden to things breaking in turn stopping cash flow - which is why the merger is more important for both DRM and SLR.
As for BRB - after a quick look on their website, they have something, it looks like a challenge to develop so put it into a what this space