“WHEREAS [MRI] agrees to buy and [EMC] agrees to sell a copper flotation concentrate production of Erdenet Mining Corporation (“Concentrate”) on the terms and conditions hereinafter contained: 2. Duration – This Contract shall enter into force from the date of the last signature and shall remain in force until completion of the Parties’ obligations herein. 3. Quantity - The quantity of Concentrate to be delivered shall be 40,000 WMT plus or minus 10% at [EMC’s] option. 6. Dispatch 6.1 Shipping schedule shall be agreed during the negotiations of terms for 2010. 9. Deductions 9.1 Treatment Charge shall be agreed between [MRI] and [EMC] during the negotiation of terms for 2010. 9.2 Refining charge shall be agreed between [MRI] and [EMC] during the negotiation of terms for 2010. 25. Prior Agreements - This Contract shall constitute the entire agreement between the Parties hereto and supersedes all prior agreements and understandings, whether oral or written, in relation to the subject matter hereof. Except the terms of the Settlement Agreement between Parties dated30 January 2009 .”
“19. It is unnecessary, and would be superfluous, to review those authorities again in this judgment. It is I think sufficient to identify five propositions which, as it seems to me, are not capable of dispute. 20. First, each case must be decided on its own facts and on the construction of the words used in the particular agreement. Decisions on other words, in other agreements, construed against the background of other facts, are not determinative and may not be of any real assistance. 21. Second, if on the true construction of the words which they have used in the circumstances in which they have used them, the parties must be taken to have intended to leave some essential matter, such as price or rent, to be agreed between them in the future—on the basis that either will remain free to agree or disagree about that matter—there is no bargain which the courts can enforce. 22. Third, in such a case, there is no obligation on the parties to negotiate in good faith about the matter which remains to be agreed between them—see Walford v. Miles [1992] A.C. 128 , at page 138G. 23. Fourth, where the court is satisfied that the parties intended that their bargain should be enforceable, it will strive to give effect to that intention by construing the words which they have used in a way which does not leave the matter to be agreed in the future incapable of being determined in the absence of future agreement. In order to achieve that result the court may feel able to imply a term in the original bargain that the price or rent, or other matter to be agreed, shall be a “fair” price, or a “market” price, or a “reasonable” price; or by quantifying whatever matter it is that has to be agreed by some equivalent epithet. In a contract for sale of goods such a term may be implied bysection 8 of the Sale of Goods Act 1979 . But the court cannot imply a term which is inconsistent with what the parties have actually agreed. So if, on the true construction of the words which they have used, the court is driven to the conclusion that they must be taken to have intended that the matter should be left to their future agreement on the basis that either is to remain free to agree or disagree about that matter as his own perceived interest dictates there is no place for an implied term that, in the absence of agreement, the matter shall be determined by some objective criteria of fairness or reasonableness. 24. Fifth, if the court concludes that the true intention of the parties was that the matter to be agreed in the future is capable of being determined, in the absence of future agreement, by some objective criteria of fairness or reasonableness, then the bargain does not fail because the parties have provided no machinery for such determination, or because the machinery which they have provided breaks down. In those circumstances the court will provide its own machinery for determining what needs to be determined—where appropriate by ordering an inquiry (see Sudbrook Trading Estate Ltd v. Eggleton [1983] A.C. 444).”