UM-2 and UM-4 Sulphide-Bearing Ultramafic Rocks
UM-2 and UM-4 are from the Werner Lake - Gordon Lake district of northwestern Ontario. These rock samples are intended as reference materials for the determination of ascorbic acid/hydrogen peroxide-soluble copper, nickel, and cobalt in ultramafic rocks to evaluate their ore potential.
| Sample | Cu | Ni | Co |
|---|---|---|---|
| UM-2 | 0.095 | 0.29 | 0.012 |
| UM-4 | 0.054 | 0.19 | 0.007 |
| wt % | ||
|---|---|---|
| Constituent | UM-2 | UM-4 |
| SiO2 | 39.2 | 39.35 |
| TiO2 | 0.24 | 0.35 |
| Al2O3 | 7.23 | 8.98 |
| Total Fe as FeO | 12.95 | 12.8 |
| MnO | 0.08 | 0.15 |
| MgO | 25.45 | 22.5 |
| CaO | 4.68 | 6.27 |
| Na2O | 0.32 | 0.45 |
| K2O | 0.11 | 0.18 |
| P2O5 | 0.02 | 0.02 |
| H2O | 6.27 | 4.86 |
| CO2 | 0.1 | 0.26 |
| S | 0.94 | 0.44 |
| Cr2O3 | 1.51 | 2.59 |
| ZnO | 0.004 | 0.008 |
Details of the mineralogy of UM-2 and UM-4 are given in Geological Survey of Canada Paper 71-35, "Three geochemical standards of sulphide-bearing ultramafic rock: UM-1, UM-2, and UM-4". The following table by E.M. Cameron provides values for the major and minor elements; they are intended for information purposes only. Note: the supply of UM-1 has been exhausted.
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