After completing a claim consolidation in September, Riverside conducted a follow up field mapping and sampling program of 103 samples with the best sample returning 83.2 g/t (2.6 oz/t) gold and 4,816 g/t (150 oz/t) silver. The work further enhanced Riverside's understanding of the structural and lithological context by linking the small historical workings into a larger regional context. Although the Project is still in its initial stages, mineralization appears to be of manto-chimney and replacement type within Pre-Cambrian to Cambrian sedimentary rocks
Previous sampling this year by Riverside returned high grade gold assays up to 59.4 g/t Au from dump materials and surface sampling. Following-up on this high-grade discovery Riverside's team returned and was able to define the extent of the mineralization. The highlights of this latest work defined high grade polymetallic samples up to 30% Zn, 83.2 g/t Au, 4,816 g/t Ag, 10.3% Pb. Of the 103 samples assay value ranged from 83.3 g/t gold to non-detectable with about 30% of the samples returning significant values in gold, silver, lead and/or zinc the best being
Riverside's President and CEO,
Geological Environment
Three sedimentary units have been identified from top to bottom: black limestone, quartzite, and grey limestone. Thicknesses of these units vary from 150 to 250 m with folding occurring mostly within the grey limestone, which is believed to be the primary reactive layer responsible for mineral deposition. As a weaker unit the grey limestone is prone to low angle thrusting while the quartzite units are more brittle and tend to fracture.
Post-mineral faulting also plays an important role. The west side of the property at the Plomito mine target area is separated from the Union-Famosa corridor target by a 3 km-wide colluvium-filled N-S trending graben. The geology at the
Geochemistry shows an overall similar pattern across the property, with the dominant geochemical signature being polymetallic Pb-Ag-Zn-As-Cu-Sb-Au. Secondary Au-As association is recognized which suggests another hydrothermal event spatially associated with the dominant polymetallic event.
Mineralization is found on surface associated with low angle faults, folds, with the thicker mineralized intervals being where high angle fault intersect with other structures creating 'traps'. GIS compilation of Riverside's work and older data is showing a tendency for thicker mineralized zones to occur within the stratigraphy defined 'grey limestone' where replacement and crack infilling is noted.
Riverside is currently planning future exploration work, which will include a geophysical survey to better identify the depth and behavior of mineralization within the grey limestone unit and the structural nature of the lower part of the sedimentary sequence. The next stage in exploration will be to compile the proposed geophysics with the existing information to identify drill targets for a 2022 program.
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Riverside is a well-funded exploration company driven by value generation and discovery. The Company has no debt and approximately 71M shares outstanding with a strong portfolio of gold-silver and copper assets in
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