This is why TAR are targeting the RSC layer.... supergene...

This is why TAR are targeting the RSC layer.... supergene cobalt.... hence why you are getting 2-3% cobalt. Market slow to understand the dynamics of this IMHO. Mind you, even KCC didn't get it until recently.

http://www.katangamining.com/~/medi...tsoperational/technical-report-march-2018.pdf

7.4 Mineralization Primary mineralization, in the form of sulphides, within the Lower Roan is associated with the DSTRAT and RSF for the OBI and the SDB and SDS for the OBS and is thought to be syn-sedimentary in origin. Typical primary copper sulphide minerals are bornite, chalcopyrite, chalcocite and occasional native copper while cobalt is in the form of carrolite. The mineralization occurs as disseminations or in association with hydrothermal carbonate alteration and silicification.
Supergene mineralization is generally associated with the levels of oxidation in the subsurface sometimes deeper than 100 m below surface. The most common secondary supergene minerals for copper and cobalt are malachite and heterogenite.
The RSC, a lithological unit stratigraphically intermediate between the OBS and OBI host rocks, contains relatively less copper mineralization. The RSC contains appreciable copper mineralization near the contacts with the overlying SDB formation and the underlying RSF formations. The middle portion of the RSC, considered to be “sterile” by GCM, normally contains relatively less copper mineralization and was historically not sampled. KCC currently samples the entire RSC. The mineral potential of the RSC is less well known than that of other formations.
The RSC has been observed to be well mineralized in supergene cobalt hydroxide, heterogenite, which occurs as vug infillings, especially near the surface.