The VMS mineralization consists of primarily stratabound lenses of massive, typically fine grained, sulphide-barite mineralization up to 10 meters thick. Upper contacts are generally knife sharp with the marker horizon mafic volcaniclastic or chert/jasper units.
Mineralization consists of pyrite-chalcopyrite-sphalerite-galena-barite, with accessory bornite±covellite-chalcocite and sulphosalts. Within the sulphide sequence, there is evidence of some weak vertical zonation, and overprinting of sulphide mineralization and remobilisation is common within and peripheral to the massive sulphide lenses.
Lower contacts are usually gradational into stockwork zones or disseminated sulphides, with similar mineralogy to the VMS lenses, albeit of a lower tenor of grade.
Two stages of gold are inferred. The first is associated with the primary deposition of massive sulphide mineralization, and the second is a much younger overprinting phase associated with quartz veining.
The VMS bodies strike in a north-south orientation, and dip between 80° and 45° towards the east, with an overall strike length of 620m, and an average ‘flattened’ width of ~250m.
Small-scale mining in the mid-1970’s and early 1980’s exploited a small portion of the La Mina North block, mainly focussing on visible copper mineralization.
High Grade Results From Previous Drilling
|Hole||Width (m)||To (m)||m||Au (g/t)||Ag (g/t)||Cu (%)||Zn (%)||Pb (%)|