Summary of Judgment

Factual and Procedural Background

This matter reached the High Court by way of a consultative case stated from the Valuation Tribunal. The Valuation Tribunal had been required to value a "tailings management facility" — a structure comprising a base and containment walls used to contain waste material produced by mining activities. The facility had been filled to capacity and capped, such that it could no longer receive additional deposits and could not facilitate ongoing extraction activities.

The principal factual question underlying valuation was whether the facility's value should be assessed by reference to its current use as an aftercare/containment facility, or by reference to a longer time span that included its historical use in facilitating mining operations (and thereby generating revenue under relevant development consents).

Procedurally, the appeal before the Valuation Tribunal concerned valuation of structures at a mine referred to in the determination as "the Site" located in The County. The appeal focused on the single structure described as the tailings management facility; the values of other structures were largely agreed. The Valuation Tribunal issued a determination dated 19 January 2024. The Commissioner requested the case stated by the Valuation Tribunal, and the High Court (Judge Simons) heard the case stated on 26 September 2025.

Legal Issues Presented

1. Whether the Valuation Tribunal had properly identified and applied the appropriate method or combination of methods of valuation in relation to the tailings management facility, in particular whether the contractor's method of valuation (relying on notional replacement cost with a fixed decapitalisation rate) was appropriate.
2. Whether the Valuation Tribunal provided adequate reasons, and in particular whether its determination disclosed the tribunal's findings and rationale on the principal valuation method(s), such that the High Court could exercise its case stated jurisdiction under section 39 of the Valuation Act 2001.

Arguments of the Parties

Appellant's Arguments

• The Appellant took the position (as recorded in the impugned determination) that once the tailings management facility had reached capacity and been capped it had come to the end of its useful life — i.e., its useful life terminated when it could no longer receive further deposits.

Respondent's Arguments

• The Respondent contended that the facility remained "in use" in a meaningful sense because it continued to store previously deposited waste and enabled compliance with continuing aftercare obligations (including monitoring and assurances to environmental authorities), such that this continuing use had valuation relevance.
• The Respondent (through its valuer) contended before the Valuation Tribunal that the contractor's method of valuation, as described in section 50 of the Valuation Act 2001, was the appropriate (and effectively the only practicable) method to apply in this case.

Table of Precedents Cited

Court's Reasoning and Analysis

The High Court set out a structured analysis grounded in statutory provisions and the case law on reasons and tribunal deference.

1. Statutory context: The court noted section 37(4) of the Valuation Act 2001, which permits the Valuation Tribunal to adopt whatever method of valuation or combination of methods it deems appropriate, thereby recognising the tribunal's discretionary scope in selecting valuation methods.
2. Description of the contractor's method: The court summarised the contractor's method as set out in section 50 of the Valuation Act 2001 — calculate replacement cost (depreciated where appropriate), add site value, and apply a fixed decapitalisation rate of 5% to derive net annual value, with an adjustment to have regard to comparable values where practicable.
3. Practical issue in the present facts: The court observed that the tailings management facility has two distinct phases of use (active reception of tailings generating revenue; and aftercare/containment once filled and capped). This dual-phased use is atypical for properties commonly valued under the contractor's method and raises a significant question whether that method appropriately captures the property's value in its actual state.
4. Failure to identify method and reasoning: The court determined that the Valuation Tribunal's impugned determination did not disclose which valuation method it adopted. Although the determination discussed the contractor's method, comparable valuations, and hypothetical rent approaches, it did not state which of these methods the tribunal ultimately relied upon nor explain its rationale for the choice.
5. Consequence of inadequate reasons: Drawing on Company D v. Company B and Person A v. Company F, the court explained that adequate reasons are necessary both for fairness and to enable the High Court to exercise its statutory case stated supervisory jurisdiction. The absence of discernible reasoning on the principal issue frustrated the High Court's ability to engage meaningfully with the questions posed.
6. Remedy: Because the tribunal's determination failed to disclose its reasoning on a principal issue — an error of law amenable to review by case stated — the court concluded it must set aside the determination and remit the appeal for reconsideration by a differently constituted panel of the Valuation Tribunal.
7. Costs approach: The court proposed, provisionally, to reserve the costs decision pending final determination of the underlying appeal before the Valuation Tribunal, on the basis that the case stated was resolved on a narrow procedural ground and no party was wholly successful before the High Court.

Holding and Implications

SET ASIDE

Holding (direct effect): The High Court set aside the Valuation Tribunal's determination dated 19 January 2024 pursuant to section 39 of the Valuation Act 2001. The underlying appeal is remitted for reconsideration by a differently constituted panel of the Valuation Tribunal.

Implications:

• The remittal means the Valuation Tribunal must reconsider and produce a determination that discloses the valuation method(s) adopted and the tribunal's rationale for those choices, particularly addressing whether the contractor's method is appropriate for the tailings management facility given its distinct phases of use.
• The decision underscores that curial deference to tribunal expertise depends on the tribunal providing adequate reasons; an inadequately reasoned determination is reviewable and can be set aside as an error of law.
• On costs, the court took a provisional view to make no order at this stage; costs may be revisited once the underlying appeal is finally determined. The parties have liberty to seek a costs order from the court after final resolution of the Valuation Tribunal appeal.
• The judgment does not create a new valuation rule; it enforces existing standards for adequate reasoning and proper engagement with statutory valuation methods in tribunal determinations.

Order

The determination of the Valuation Tribunal dated 19 January 2024 is set aside and the underlying appeal is remitted for reconsideration by a differently constituted panel of the Valuation Tribunal. No costs order is made at this stage; parties may re-enter the matter on costs after the underlying appeal is finally determined. Parties may apply within twenty-one days if they seek a different form of order.

Appearances

Attorney Leonard and Attorney Vallely for the Respondent (instructed by Company C).

Attorney Hickey and Attorney Maolchalain for the Appellant (instructed by Company D).

Judge Simons, High Court — Judgment delivered 26 September 2025.