From anomaly to reserve

Early signals are distinct

The three terms belong to early stages but answer different questions. They help organize evidence and determine whether an area merits further work.

• Anomaly: a geochemical, geophysical, spectral, or spatial pattern that differs from the expected behavior for the region or dataset.
• Occurrence: a location where a substance or mineralization has been identified, without demonstrating size, continuity, or viability.
• Target: an area prioritized because the combination of evidence justifies more detailed investigation.

An exploration result is not a resource

Samples, trenches, or drilling may produce relevant results. They describe the investigated material and help test a geological hypothesis, but do not automatically demonstrate geometry, volume, or continuity at deposit scale.

Advancement requires an understanding of spatial distribution, data quality, mineralogy, density, and interpretation limits. Isolated results may justify new campaigns, not a conclusion about the entire area.

Resource, reserve, and proof

A Mineral Resource depends on sufficient geological evidence and sampling to estimate quantity, grade, form, and continuity at a stated level of confidence. Classification must follow recognized technical criteria and make assumptions and limitations explicit.

A Mineral Reserve adds evidence that a portion of the resource can be economically extracted after considering mining, processing, infrastructure, environmental, permitting, economic, and market factors. A reserve is not synonymous with everything that exists underground.

Exploration reduces uncertainty

Regional information may generate an anomaly. Converging evidence turns part of that universe into targets. Fieldwork, sampling, geophysics, mineralogy, metallurgy, and drilling deepen the hypothesis and show whether there is a technical reason to continue.

Not every opportunity passes through every stage. Closing a hypothesis that has lost support is part of the discipline: it preserves capital and focuses investigation on questions with the greatest capacity to change a decision.

Technology does not validate

Geospatial models can compare thousands of areas under consistent criteria, recognize convergence among layers, and indicate where available information is weaker or more coherent. This narrows the search space and guides the next work.

A computational classification remains a hypothesis based on available data. It is not equivalent to a discovery, resource, or reserve and must be tested by specialists, fieldwork, and appropriate technical evidence.

How to read evidence

Check which term is used, which evidence supports it, the extent of sampling, the base date, the methodology, and the limitations. Determine whether the information describes a sample, target, exploration result, resource, or reserve.

Correctly separating these stages protects readers from premature conclusions. For rare earths, it is also essential to identify which elements were found, which minerals host them, and whether a plausible recovery route exists.