Description
DOWNLOAD AMIS CERTIFICATE (PDF)
Origin of Material
The material is sourced from parts of the Kaapvaal Craton and is overlain by late Archaean Ventersdorp lavas and tertiary sediments.
Approximate Mineral and Chemical Composition
The host rock is mainly Banded Iron Formations, and the Goldridge deposits occur within the central belt which comprises BIF, magnetite quartzite, chert, greywacke, shale and schist.
Certified Concentrations (at two Standard Deviations)
| Analyte | Method | Certified Value (µ) | Two standard deviations (2s) ± | Unit |
| Au | Pb Collection | 1.19 | 0.072 | g/t |
| Au | 2A_MICP | 1.16 | 0.10 | g/t |
| Au | FA_GRAV | 1.22 | 0.090 | g/t |
| Au | CL | 1.22 | 0.053 | g/t |
| Ag | 4A_MICP | 0.5 | 0.2 | ppm |
| Cu | 4A_MICP | 97 | 14 | ppm |
| S | 4A_MICP | 0.15 | 0.02 | % |
| SG | SG | 3.15 | 0.47 | Dimensionless |
| As | 4A_MICP | 159 | 33 | ppm |
| Ba | 4A_MICP | 109 | 15 | ppm |
| Be | 4A_MICP | 1 | 0.2 | ppm |
| Ca | 4A_MICP | 8122 | 691 | ppm |
| Co | 4A_MICP | 15 | 3 | ppm |
| Cr | 4A_MICP | 199 | 26 | ppm |
| Fe | 4A_MICP | 29.50 | 0.53 | % |
| K | 4A_MICP | 789 | 64 | ppm |
| La | 4A_MICP | 6 | 2 | ppm |
| Mg | 4A_MICP | 6800 | 663 | ppm |
| Mn | 4A_MICP | 3329 | 278 | ppm |
| Mo | 4A_MICP | 26 | 2 | ppm |
| Ni | 4A_MICP | 72 | 15 | ppm |
| P | 4A_MICP | 956 | 84 | ppm |
| Sc | 4A_MICP | 6 | 0.6 | ppm |
| Sr | 4A_MICP | 85 | 6 | ppm |
| V | 4A_MICP | 225 | 19 | ppm |
| W | 4A_MICP | 87 | 17 | ppm |
| Zn | 4A_MICP | 104 | 21 | ppm |
Major Oxides Certified Concentrations (at two Standard Deviations)
| Analyte | Method | Certified Value (µ) | Two standard deviations (2s) ± | Unit |
| Al2O3 | XRF | 2.62 | 0.13 | % |
| CaO | XRF | 1.12 | 0.12 | % |
| Cr2O3 | XRF | 0.030 | 0.0009 | % |
| Fe2O3 | XRF | 42.55 | 0.51 | % |
| MgO | XRF | 1.13 | 0.14 | % |
| Na2O | XRF | 0.080 | 0.01 | % |
| P2O5 | XRF | 0.21 | 0.02 | % |
| SiO2 | XRF | 45.73 | 2.1 | % |
| SO3 | XRF | 0.39 | 0.05 | % |
