| Takeaway | Detail |
|---|---|
| Three deposits in Sierra Leone are subject to the 2026 rutile audit. | Headline lists three deposits; the required number is three. |
| Each deposit requires a current CRIRSCO-compatible resource statement converted to contained rutile tonnes. | Statements must be current and compatible with CRIRSCO standards; conversion yields contained rutile tonnes per deposit. |
| The five percent rutile demand denominator must be sourced, year-stamped, and specify product form. | Denominator uses five percent of rutile, citing source, year, and product form (rutile). |
| All three deposits must match the demand denominator; any missing side makes the audit claim unproven. | Both resource statements and demand figures are required; lack of either renders the claim invalid. |
This guide outlines the 2026 Sierra Leone rutile audit that evaluates three identified deposits against market demand.
The conclusions remain provisional until each deposit provides a current CRIRSCO-compatible resource statement in contained rutile tonnes and aligns with a sourced, year-stamped five percent demand denominator.
How a Rutile Audit Actually Works
An audit-grade rutile statement for any Sierra Leone deposit must cite a named CRIRSCO-compatible reporting code with an effective date. Check the statement for the code and date; a resource figure without both is not audit-grade and cannot be used in the 2026 comparison.
The audit chain separates Mineral Resource from Mineral Reserve. USGS defines reserves as the economically mineable part of measured or indicated resources, never including inferred material. For each of the three deposits, the auditor must record location, ownership, reporting code, effective date, cut-off grade, rutile grade, and contained rutile tonnes. Any missing field breaks the chain.
Contained rutile tonnes are derived by multiplying the resource tonnage by the rutile grade and applying the appropriate recovery or cut-off factor. The result must be expressed in contained tonnes of rutile, not ore. This figure becomes the left-hand side of the 2026 demand equation.
The right-hand side is a sourced, year-stamped 5% demand denominator. It must name the source, the year, the product form (e.g., concentrate, slag, pigment), and the basis of the 5% figure. Without these four elements, the denominator is unverifiable and the comparison is void.
The audit is valid only if all three deposits pass code, date, category, and contained-tonne checks, and the demand denominator is fully sourced and year-stamped. If either side is missing, the 3-deposit vs 5% claim is unproven and must not be published or acted upon.
What the Evidence Actually Supports
This section alone states that the evidentiary grounding supports classification definitions and the known mineral occurrence in Sierra Leone only, not a rutile demand figure. The audit can be narrowed to how a statement is classified and how an occurrence is described, but the demand side cannot be closed from that grounding alone. Until the denominator is traced, any comparison to a material need remains an assertion rather than a supported conclusion. That boundary matters before any tonnage is discussed.
The U.S. Geological Survey material reviewed here draws a distinction between total mineral endowment and its parts, including identified and undiscovered resources, with certainty tied to the adequacy of knowledge. That distinction is useful for audit vocabulary because it separates described potential from established endowment. It is not, by itself, a rutile tonnage for Sierra Leone, and it should not be converted into one without a source-specific statement. The vocabulary alone cannot substitute for a property-level measurement.
The deeper read of reporting practice shows that mineral reporting categories are code-based. A deposit figure cannot enter the audit cleanly if it does not name its reporting code, effective date, category, and cut-off. Those elements function as a chain of custody for the number. Without them, the figure may still be meaningful historically, but it is not yet admissible to the comparison as an audit-grade contained tonnage. The audit should record the code, date, category, and cut-off together, because a category without those anchors is not sufficient for a contained tonnage comparison.
Any regional or descriptive mineral account for Sierra Leone is not by itself enough to resolve whether rutile is present in a form and quantity that supports a resource statement. The check is source-specific: does the cited occurrence match the critical mineral of interest, and does the language support a contained tonnage rather than a broader exploration theme? The presence of a critical mineral must be established for the specific deposit, not inferred from a broad regional story.
The evidentiary gate is narrow. The comparison should not be published or acted on until each cited deposit passes the code, date, category, and contained-tonne checks, and until the demand denominator names its source, year, product form, and basis. If either the deposit statement or the denominator is missing those elements, the claim remains unproven. The test is sequential and conditional, and the burden sits on both sides before any figure is used.
Three Audit Paths: Which One Wins?
Three audit paths compete to validate the Sierra Leone 2026 rutile claim, but only one produces a defensible number. The code-first path requires a CRIRSCO-compatible resource statement—JORC 2012, PERC 2021, CIM, or SAMREC—converted to contained rutile tonnes and matched to a sourced, year-stamped 5% demand denominator. Without the named code and effective date, the figure is not auditable, and the claim collapses. This path is the winner because it is the only route that generates a contained-tonne total tied to a public reporting standard and an explicit effective date.
The headline-first path begins with the assertion of three deposits and a 5% demand share. It skips the resource statement entirely and treats the deposit count as proof. The failure mode is immediate: the denominator is missing. Without a sourced demand figure—naming the source, year, product form, and tonnage—the comparison is unmoored. This path is rejected because it substitutes assertion for verification.
The map-first path relies on occurrence or prospectivity maps. These show where rutile is known or likely to exist, but they do not classify tonnage or confidence. The failure mode is category error: an occurrence is not a resource. This path is useful only as a screening tool, not as a basis for a 5% demand claim. It cannot produce a contained-tonne number and therefore cannot close the audit loop.
The code-first path wins because it is the only one that satisfies all four gates: code, date, category, and contained tonnes. It forces the auditor to name the reporting standard, state the effective date, classify the resource correctly, and convert the figure to contained rutile. Only then can it be matched to a demand denominator that is sourced, year-stamped, and product-specific. Any deviation from this sequence leaves the claim unproven.
Adopting the code-first path means rejecting shortcuts. The audit must start with a resource statement, not a headline or a map. The statement must cite one of the four recognized codes, carry an effective date, and be converted to contained rutile tonnes. The demand denominator must then be sourced, named by year, and specified by product form. If any of these elements is missing, the 3-deposit vs 5% demand comparison is invalid and must not be published or acted upon.
Costs and Numbers That Change the Verdict
Before any ratio is computed, count the deposits that clear the code test. The headline names three; the audit counts only those carrying a resource statement that cites a named CRIRSCO-compatible code and an effective date. Write that tally down as a number before touching demand. If two deposits clear and one does not, the three-deposit claim is unproven and must be restated as a two-deposit claim. A partial count is not a rounding problem; it changes the noun in the sentence.
The denominator gate is stricter than it appears. A 5% demand share is computable only when the demand figure arrives with four labels attached: the named publishing source, the year of the estimate, the product form (rutile concentrate or TiO2), and the units. Remove any one of the four and the ratio is not imprecise, it is undefined. Two failure modes do the most damage. A denominator taken from a partial or preliminary demand estimate understates the base and inflates the share. A numerator stated as contained rutile set against a denominator stated as TiO2, or the reverse, compares unlike quantities; the conversion factor must be quoted from the demand source, not assumed by the analyst.
The category gate fixes what may be summed. The base case uses Measured plus Indicated only. Inferred material is reported on a separate line and is not folded into the base-case total. That follows the classification logic itself: USGS divides total endowment into identified and undiscovered resources and subdivides those by adequacy of knowledge, and the CRIRSCO-aligned definitions treat a Mineral Reserve as the economically mineable part of a Measured and/or Indicated Mineral Resource. An Inferred tonnage therefore cannot be added to Measured and Indicated tonnes to produce a headline contained-rutile figure.
Recency is an audit choice rather than a code requirement, and it should be labeled that way in print. Set and state an audit cut-off in the same sentence as the result. Screen on the effective date the code requires, not on the date a document happened to be posted. Reports inside the stated window enter the base case; reports outside it are listed with their dates and excluded, so a reader can see what was set aside.
The cost of skipping each gate is asymmetric, which is why the order of operations matters:
| Gate | Evidence required to pass | Cost of a miss |
|---|---|---|
| Count | Three code-compliant statements, each with a named code and effective date | Headline noun is wrong; the claim describes fewer deposits than it says |
| Denominator | Source, year, product form, and units all named | Ratio is not computable, or is silently inflated by a partial base |
| Category | Measured plus Indicated in the base case; Inferred on its own line | Base case carries the lowest-confidence tonnes as if they were firm |
| Recency | Effective date inside the stated cut-off window | Stale tonnage and grade are carried forward without disclosure |
Where the Audit Claim Breaks
The 3-deposit versus 5% demand comparison collapses whenever a single deposit fails the CRIRSCO-compatibility check or the demand denominator omits its source and year. The edge cases are narrow but absolute: if a statement lacks a named code and effective date, it cannot be converted to contained rutile tonnes and must be excluded from the total. If the product form is mixed—rutile concentrate and TiO₂ reported separately—the ratio is meaningless until both are converted to the same product form. Including an inferred resource inflates the numerator and overstates the claim; the audit must report measured plus indicated (M+I) as the base case. Finally, if the demand figure lacks a named source and year, no ratio can be calculated at all.
A deposit statement that cites only “historical estimates” or “internal scoping studies” without a named CRIRSCO-compatible code and effective date is excluded immediately. A deposit report that gives a TiO₂ grade but does not state whether the grade is rutile or ilmenite cannot be converted to contained rutile tonnes. A demand figure that states a percentage share without naming its source, year, product form, and units is unusable. In each case, the audit chain is broken, and the 3-deposit versus 5% claim is unproven.
Frequently Asked Questions
How many deposits are required to be audited in the 2026 Sierra Leone rutile audit?
Three deposits are required, as the headline and required number both specify three.
What type of resource statement is mandatory for each deposit to be considered audit-grade?
Each deposit must provide a current CRIRSCO-compatible resource statement converted to contained rutile tonnes.
What specific details must the five percent rutile demand denominator include?
The denominator must be sourced, year-stamped, and specify the product form as rutile.
What happens if one of the three deposits fails to provide a current resource statement?
Any missing side makes the audit claim unproven, as all three deposits must match the demand denominator.
Can a resource figure without a CRIRSCO-compatible reporting code and effective date be used?
No, a resource figure without both a named CRIRSCO-compatible reporting code and an effective date is not audit-grade and cannot be used.
What are the consequences of lacking either the resource statements or the demand figures?
Lack of either the resource statements or the demand figures renders the audit claim invalid.
Quick answers
| How many deposits are subject to the 2026 rutile audit in Sierra Leone? | Three deposits are subject to the 2026 rutile audit. |
| What is the required denominator for comparing the deposits to market demand? | The required denominator is five percent of rutile demand, which must be sourced, year-stamped, and specify product form. |
| What type of resource statement is required for each deposit? | Each deposit requires a current CRIRSCO-compatible resource statement converted to contained rutile tonnes. |
| What happens if either the resource statements or the demand denominator are missing? | If either the resource statements or the demand denominator are missing, the audit claim is invalid. |
| What standards must the resource statements comply with? | The resource statements must be current and compatible with CRIRSCO standards. |
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