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LoginMulti-acid methods such as ALS’s four-acid are popular due to demonstrated utility. Defining the value of a resource project goes beyond determining the contained volume of metal. Four-acid digestion methods offered by ALS provide data that can be used to estimate mineralogy and establish proxies for physical and chemical deposit characteristics such as the hardness of ore, deleterious gangue mineralogy, weathering and oxidation fronts, identification of construction materials such as road base and mapping of reactive sulphides for acid mine drainage management.
Our ME-MS61L™ method provides robust results at levels well below the lowest regional backgrounds for most elements, allowing an unprecedented level of detail in major and trace element geochemistry on every sample.
This method provides ALS's lowest detection levels from a four-acid digestion and is achieved via proprietary ICP-MS methodology.
| Code | Analytes & Ranges (ppm) | |||||||
|---|---|---|---|---|---|---|---|---|
| ME-MS61L™ 0.25g sample |
Ag | 0.002-100 | Cu | 0.02-10,000 | Na | 0.001%-10% | Sr | 0.02-10,000 |
| Al | 0.01%-50% | Fe | 0.002%-50% | Nb | 0.005-500 | Ta | 0.01-500 | |
| As | 0.02-10,000 | Ga | 0.05-10,000 | Ni | 0.08-10,000 | Te | 0.005-500 | |
| Ba | 1-10,000 | Ge | 0.05-500 | P | 0.001%-1% | Th | 0.004-10,000 | |
| Be | 0.02-1,000 | Hf | 0.004-500 | Pb | 0.01-10,000 | Ti | 0.001%-10% | |
| Bi | 0.002-10,000 | In | 0.005-500 | Rb | 0.02-10,000 | Tl | 0.002-10,000 | |
| Ca | 0.01%-50% | K | 0.01%-10% | Re | 0.0004-50 | U | 0.01-10,000 | |
| Cd | 0.005-1,000 | La | 0.005-10,000 | S | 0.01%-10% | V | 0.1-10,000 | |
| Ce | 0.01-500 | Li | 0.2-10,000 | Sb | 0.02-10,000 | W | 0.008-10,000 | |
| Co | 0.005-10,000 | Mg | 0.01%-50% | Sc | 0.01-10,000 | Y | 0.01-500 | |
| Cr | 0.3-10,000 | Mn | 0.2-100,000 | Se | 0.006-1000 | Zn | 0.2-10,000 | |
| Cs | 0.01-500 | Mo | 0.02-10,000 | Sn | 0.02-500 | Zr | 0.1-500 | |
A full suite of Rare Earth Elements (REEs) can be added to the ME-MS61L™ method as well as Pb isotope analysis. These add-on methods can provide useful information for exploration in some regions and deposit types. Depending on the minerals hosting the REEs the digestion may not be complete which will provide only the REEs hosted in the labile minerals and adsorbed to mineral surfaces.
REEs and/or Pb isotope measurements can be added to ME-MS61L™ to provide extra dimension for exploration.
| Code | Analytes & Ranges (ppm) | |||||||
|---|---|---|---|---|---|---|---|---|
| MS61L-REE™ Add-on only |
Dy | 0.005-1000 | Ho | 0.002-1000 | Sm | 0.004-1000 | ||
| Er | 0.004-1000 | Lu | 0.002-1000 | Tb | 0.002-1000 | |||
| Eu | 0.004-1000 | Nd | 0.005-1000 | Tm | 0.002-1000 | |||
| Gd | 0.005-1000 | Pr | 0.004-1000 | Yb | 0.004-1000 | |||
| MS61L-PbIS™ Add-on only |
204Pb | 0.01-10000 | 207Pb | 0.01-10000 | ||||
| 206Pb | 0.01-10000 | 208Pb | 0.01-10000 | |||||
22 JUN 2022
No. Some resistive minerals are only partially broken down by a 4-acid digestion and the extent of digestion is often due to the form they take. For example, a zircon that has no structural damage will be highly resistant to 4-acid digestion but zircon that is metamict will often be digested due to structural damage in the mineral.
When super trace detection limits are not needed, four-acid methods with alternative detection limits are available.
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