Molopo Farm Geology22 Feb 2021 18:47
The evidence to date would suggest that Molopo Farms does not mirror Bushveld but is more akin to the Kalahara Suture Zone, steeply dipping, dyke-like ultramafic and mafic bodies parallel to major shears interpreted as solidified feeder zones, but minus the coal bearing rocks that inject sulphur into the mix. If the Nickel Sulphide pockets are confirmed then great as the more advanced survey techniques will enable more precise targeting of these zones; but need to await assay results to confirm.
http://nora.nerc.ac.uk/id/eprint/14839/1/GEOPHYSICAL_MODELLING_OF_THE_MOLOPO_FARMS_COMPLEX_-_for_NORA.pdf
Mineralisation
Previous mineral exploration (Behr, 1974 and 1987; Gould et al., 1987, Reichhardt, 1994) focused on finding PGE
mineralization comparable to that found in the Bushveld Complex. Efforts were made to establish a complete
igneous stratigraphy for the MFC and to identify the ultramafic-mafic contact. PGE mineralization was discovered
but found to be laterally discontinuous, even between closely spaced exploration drillholes and therefore of no
economic value. The laterally discontinuous nature of platinum mineralization noted by previous exploration
(notably by Reichhardt, 1994) may now be attributed to the laterally discontinuous nature of the host rocks.
It is suggested that an alternative exploration target are the steeply dipping, dyke-like ultramafic and mafic bodies
parallel to major shears interpreted as solidified feeder zones. According to models developed for the genesis of
magmatic Ni-Cu ± PGE sulphide deposits in Voisey’s Bay, Labrador, at Nor’ilsk in Russia and elsewhere, the
feeder conduit is regarded as a particularly favourable site for mineralisation (Evans- Lamswood et al., 2000;
Naldrett, 1999; Naldrett, 2007). Interaction of the magma with country rocks, possibly associated with the addition
of sulphur, is also an important genetic control although there is no evidence for this in the MFC. Repeated magma
flow within the feeder zones can give rise to massive sulphide mineralisation, which is preferentially developed
where physical traps exist for the concentration of sulphide droplets, either in structural embayments or
irregularities, or at the point where the feeder enters a high-level magma chamber. On this basis, future exploration
should be focused along the postulated MFC feeder zones (zones E and F in Figure 6). However, given the inferred
complexity of the intrusive plumbing in the central internal sector of the MFC and the lack of exposure, it is not
possible to predict the precise locations of targets in this part of the MFC.