Executive Summary: Key Legal and Evidentiary Issues

• Teck Metals Ltd. challenged the Property Assessment Appeal Board's decision that 17 tanks at its Trail, B.C. smelter were assessable improvements under the Assessment Act.

• Central dispute involved whether the Vessels qualified as "electrolytic tanks" or "dust and particulate collectors or separators" under s. 1.2(1)(v)(i) of the Assessment Act Regulation, thereby excluding them from property tax assessment.

• The Board erroneously confined "particulate" to airborne particles only, illogically interpreting "dust and particulate" disjunctively yet treating both as essentially the same thing.

• An overly narrow definition of "electrolytic tanks" equated them to the tank portion of an electrolytic cell with the anode and cathode removed, when the Court found the term must mean something more than an electrolytic cell or a component of it, given that "electrolytic cells" are already separately excluded.

• Reliance on the MIPs Manual to restrict the meaning of regulatory exclusions was found to be misplaced, as the manual's costing purpose is distinct from the Executive's power to exclude improvements from assessment.

• The Court applied the correctness standard of review, finding that the Regulation's exclusions are process-based and functionally oriented, not confined by industry nomenclature or MIPs Manual terminology.

The zinc smelting operations and the vessels in dispute

Teck Metals Ltd. operates a smelter in Trail, British Columbia, that produces zinc through a multi-stage process involving roasting, leaching and purification, and electrolysis. Zinc concentrate enters what is known as the "Zinc Circuit" through three pathways: from off-site mines into Roasters, into the Zinc Pressure Leaching Plant, and from lead smelter fume processed in the Oxide Leach Plant. The plants in the Zinc Circuit operate in combination and sequentially to produce zinc electrolyte solution of a purity suitable for electrolysis, the final step in which pure zinc is plated onto large aluminum cathodes inside electrolytic cells at the Electrolytic and Melting Plant.

At issue were 17 tanks, commonly called "thickeners" and "clarifiers" in industry, located across the Sulphide Leaching Plant, Oxide Leaching Plant, Zinc Pressure Leaching Plant, and Ground Water Treatment Plant. All of the Vessels have a capacity greater than 5,000 gallons and were therefore deemed to be "improvements" subject to property tax assessment under s. 1(2)(l) of the British Columbia Assessment Act. The core question was whether these Vessels were nevertheless excluded from that definition by the Assessment Act Regulation, which carves out specific types of vessels including "electrolytic tanks" and "dust and particulate collectors or separators" under s. 1.2(1)(v)(i).

The Board's original decision and its reasoning

The Property Assessment Appeal Board determined that none of the Vessels was excluded from the definition of improvements by being either "electrolytic tanks" or "dust and particulate collectors or separators." On the "dust and particulate collectors or separators" issue, the Board accepted that the phrase could be read disjunctively to mean a vessel removing dust or particulate, or both. However, the Board found that the intent of the Executive was for the word "particulate" to be informed by the meaning of the word "dust." As dust is only found in air, the Board confined the meaning of "particulate" to particles in air rather than in liquid. The Board concluded that since the Vessels separate particles from liquid, they were not "dust and particulate collectors or separators" and were not excluded from the definition of improvements by the Regulation. On "electrolytic tanks," the Board agreed with the Assessor and concluded that the term was to be interpreted restrictively to mean the tank portion of the electrolytic cell that remains once the anode and cathode has been temporarily removed. The Board also applied presumptions against absurdity and of coherence, reasoning that it would be "absurd" for the MIPs Manual to include thickeners and clarifiers for costing, only for the same type of vessel to be excluded from assessment by the Regulation.

The statutory framework and interpretive principles applied by the Court

The appeal came before the Supreme Court of British Columbia as a stated case under s. 65 of the Assessment Act, which permits appeal on a question of law alone. Both parties agreed the standard of review was correctness. The Court applied the modern approach to statutory interpretation, reading the words of the legislation in their entire context, in their grammatical and ordinary sense, harmoniously with the scheme of the Act, the object of the Act, and the intention of Parliament. Justice Fowler emphasized that the plain meaning of the text is not in itself determinative and must be tested against the other indicators of legislative meaning, including context and purpose, drawing on the Supreme Court of Canada's guidance in La Presse inc. v. Quebec and Bell ExpressVu Limited Partnership v. Rex.

The legislative purpose behind the exclusions

A significant portion of the Court's analysis addressed whether a coherent purpose could be discerned for the exclusions in the Regulation. Both parties agreed that there is no uniting commonality to be found in the type of items excluded by the Regulation. However, the Court found that the excluded vessels in s. 1.2(1)(v)(ii) through (vi) share the common characteristic that they are actively used for the production or manufacture of products in specified major industrial plants. Subsection 1.2(1)(v)(i) is not limited to any specific industry, but the Court was satisfied that those vessels are all types otherwise united by the same overall common characteristic of being used in production or manufacture of products, rather than something more passive, like storage. The Court noted that the Executive made a deliberate choice to describe types of vessels purposively, rather than using their industrial name, precisely to ensure that what was being captured by the exclusions was what the improvement was doing, rather than by what it may or may not be called in industry. This functional and purposive approach was found to be consistent with the prior Board decision in Fletcher Challenge, which concluded that the Regulation "appears to exclude from assessment vessels that are in the nature of production machinery, that is, vessels that do something essential or integral to the production process beyond storage," and the Board decision in Norske Skog, which reiterated that excluded vessels are those "where actual processing takes place within the vessel… vessels that do something, beyond storage."

The Court's interpretation of "dust and particulate collectors or separators"

The Court found the Board's reasoning to be illogical. It was illogical, Justice Fowler held, to first conclude that particulate and dust are to be interpreted disjunctively, in other words to find that dust and particulate are distinct things, and then immediately go on to conclude that dust and particulate are essentially the same thing, particles present in air. The stated case facts themselves established that dust is a type of particulate that only occurs in gas, dust is found only in air, and particulate can be separated from any fluid stream be that gas or liquid. The Court could find no justification from a review of the legislative context for such a narrow interpretation that would limit the type of vessel to something that collects or separates dust and particulate from air. The Court further observed that it is illogical to limit the meaning of particulate in the context of a vessel described as a "dust and particulate collector and separator" to airborne particles, when the word vessel is itself more usually associated with liquids. A narrow interpretation of "dust and particulate collectors and separators" was also found to be inconsistent with the self-evident breadth of the exclusions set out in the Regulation.

The Court's interpretation of "electrolytic tanks"

The Board's interpretation that "electrolytic tanks" was limited to the portion of the electrolytic cell when the anode and cathode have been removed was rejected. The Court noted that electrolytic cells are specifically identified as excluded vessels in s. 1.2(1)(v)(i) of the Regulation. The Court found that the only reasonable interpretation of electrolytic tanks is that it is intended to mean something more than an electrolytic cell or a component of the electrolytic cell. Furthermore, the removal of the anode and cathode from the cell is a normal part of the operating procedure and does not change the essential character of the electrolytic cell; it continues to be an electrolytic cell when the anode and cathode are removed. The Court held that consistent with the ordinary meaning of electrolytic and the legislative context, "electrolytic tanks" includes vessels where electrolyte solution is manufactured or produced, rather than simply stored. This interpretation was found to be consistent with the dictionary definition of "electrolytic" — relating to electrolysis or an electrolyte, or produced by or used in electrolysis (Merriam-Webster Dictionary) — as well as the overall scheme of the Regulation, which the Court was satisfied is to exclude an expansive list of major industrial improvements from assessment based on a functional and purposive assessment of the active role of an item in production and manufacture.

The role of the MIPs Manual

The Court addressed whether the MIPs Manual, adopted as a regulation pursuant to s. 20(5) of the Act to establish rates, formulas, rules or principles for the calculation of the costs of replacing an existing industrial improvement, could be used to interpret the exclusion regulation. The Assessor argued that because the MIPs Manual includes costing categories for "thickeners" and "clarifiers," interpreting those same vessels as excluded by the Regulation would create incoherence in the legislative scheme. The Court disagreed. The development of the MIPs Manual is an entirely different process and for an entirely different purpose than the Executive's decision to exclude some improvements from assessment. The decision to exclude an improvement from assessment is not conditional upon, or intertwined with, the process of costing. The fact that an improvement can be costed does not dictate that the improvement must be assessable. The Court found it is neither absurd nor incoherent that the Executive decided to exclude some improvements from assessment despite the MIPs Manual providing costing information for some or all of those improvements. The Court held it would not be an error of law to be informed by the MIPs Manual in interpreting the Regulation, provided that "informed" is restricted to meaning assist, but it would be an error of law for the Board to be bound by the language or terminology used in the MIPs Manual in interpreting the Regulation.

The ruling and outcome

Justice Fowler concluded that the Board erred in law on multiple grounds: in restricting "particulate" to only airborne particulate, in limiting "electrolytic tanks" to the tank portion of an electrolytic cell when the anodes and cathodes have been removed, and in applying the presumptions against absurdity and of coherence based on the MIPs Manual to narrow the scope of the Regulation's exclusions. Rather than remitting the matter to the Board — which the Court agreed would serve no useful purpose other than to create even more delay, given that the matter was heard before the Board in December 2022 and February 2023, with the Board's decision not released until June 25, 2024, and a further delay of 14 months for Teck to obtain dates for the stated case hearing — the Court exercised its power to correct the Board's decision. The Court declared that the Vessels are excluded from the definition of assessable improvements under s. 1 of the Assessment Act, because they are either Electrolytic Tanks or Dust and Particulate Collectors or Separators, or both, pursuant to s. 1.2(1)(v)(i) of the Regulation. Teck Metals Ltd. was the successful party and is therefore presumptively entitled to its costs, although no specific monetary amount was determined in the judgment.