Contract interpretation and subsequent legislation claims: arbitral award upheld for minor minerals, but ordinary earth royalty claim failed.

An arbitral interpretation of a contract will be sustained where it is a possible and reasonable view, and courts will not interfere merely because another construction is available. On that basis, reimbursement for increased royalty or seigniorage on minor minerals was upheld because the contract treated price adjustment under WPI and compensation for later legislative cost increases as separate mechanisms, and the tribunal found state-specific mineral charges were not fully captured by the index. However, a claim for enhanced royalty on ordinary earth failed because the levy already existed on the contract date and the later notification did not create any new statutory burden; the tribunal therefore exceeded the subsequent-legislation clause, and that part of the award was set aside.

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Issues: (i) Whether increase in royalty or seigniorage fee on minor minerals, brought about by subsequent legislation, was separately compensable under the contract notwithstanding the price-adjustment mechanism based on WPI. (ii) Whether a claim for enhanced royalty on ordinary earth fell within the subsequent-legislation clause when the levy existed at the time of the contract and the later notification maintained the same rate.

Issue (i): Whether increase in royalty or seigniorage fee on minor minerals, brought about by subsequent legislation, was separately compensable under the contract notwithstanding the price-adjustment mechanism based on WPI.

Analysis: The contractual scheme treated price adjustment for market-linked inputs and compensation for additional cost arising from later legislation as distinct compartments. The arbitral tribunal found that minor minerals such as earth, sand and aggregate were not part of the basket used for the WPI input and that a uniform index could not fully reflect state-specific increases in seigniorage fee. It also relied on the employer's own contemporaneous view that such additional cost was separately admissible. In judicial review of an arbitral award, the construction adopted by the arbitrator could not be interfered with merely because another view was possible, unless the interpretation was unreasonable or contrary to the contract.

Conclusion: The claim was covered by the subsequent-legislation clause and the award allowing reimbursement was upheld.

Issue (ii): Whether a claim for enhanced royalty on ordinary earth fell within the subsequent-legislation clause when the levy existed at the time of the contract and the later notification maintained the same rate.

Analysis: The contract required all duties, taxes and levies existing on the relevant bid date to be included in the quoted rates. On the facts, royalty on ordinary earth was already being levied when the contract was entered into, and the later notification did not create any new liability or increase the rate. The arbitral tribunal travelled beyond the contract by treating an alleged want of legal competence in the earlier levy as a fresh post-contractual imposition. That approach exceeded the tribunal's jurisdiction under the contract and could not be sustained under the limited scope of review.

Conclusion: The claim was outside the subsequent-legislation clause and the award on that claim was set aside.

Final Conclusion: The common challenge largely failed, but the award was interfered with to the limited extent of the claim relating to ordinary earth, while the remaining awards based on later statutory enhancement of royalty were sustained.

Ratio Decidendi: An arbitral tribunal's construction of a contract will be sustained if it is a possible and reasonable view, but a claim cannot be brought within a subsequent-legislation clause where the levy was already existing under the contract and no new statutory burden was created after the contract date.

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