Buying a mine is not buying a factory: the core asset lies underground and exists on paper only through reserve reports, a time-limited licence and a train of attached environmental duties. Mine valuation in M&A is therefore a three-layer audit — reserves, licence and risk — each layer capable of erasing a significant part of the seller’s presented value. This article sets out how those three layers are valued and diligenced in a Vietnamese mine transaction.
Three valuation layers of a mine in M&A
- The reserves layer: only reserves approved by the competent authority under Law on Geology and Minerals 54/2024/QH15 carry full legal value in valuation; reserves ‘per internal geological reports’ unapproved, and inferred resources, must be heavily discounted or excluded from the value model — the largest price adjustment point in mine diligence.
- The licence layer: the mining licence’s remaining term, extendability, permitted capacity and compliance status (design, environment, reporting) decide the lawful cash flow the mine can generate; exploitation rights and investment projects transfer under conditions of Law 54/2024 and investment law — the deal must pass transfer-approval procedures, not merely an underground share sale.
- The risk and attached-duties layer: rehabilitation deposits paid and still payable, accrued rehabilitation duties over mined-out areas, unsettled resource tax and fees, community and land disputes — all must be quantified and deducted from enterprise value or handled through warranties and price holdbacks/escrow in the M&A contract.
- Valuation method: producing mines are valued mainly by discounted cash flow on the licensed mining plan; exploration-stage mines by sunk cost and comparable transactions with heavy reserve-risk discount — mixing the two methods without adjustment is the classic valuation error.
Diligencing a mine valuation before signing
- Commission an independent reserve audit: a competent geologist reconciles approved reserve reports with actual extraction data and remaining reserves in the field, to international reporting standards where the buyer is foreign.
- Full legal review of the licence chain: from exploration onwards, licence continuity, inspection minutes and unremedied violations, conditions for transferring exploitation rights and investment-policy approval for the transferee.
- Quantify ‘environmental debt’ as a price item: rehabilitation cost for all disturbed area less deposits paid, plus provisions for community and land disputes — negotiated into the price rather than discovered after closing.
A correct mine valuation prices three verifiable numbers: remaining approved reserves, lawful cash flow inside the licence term, and accrued environmental duties. Everything outside those three — ‘expected’ reserves, ‘certain’ extensions — must be paid for with discounts, not with trust.
Frequently asked questions
What is a mine valued on?
Three layers: approved remaining extractable reserves, lawful cash flow within the mining licence’s term and capacity, minus accrued duties (environmental rehabilitation, unsettled tax and fees, dispute risk).
Do unapproved reserves count in M&A value?
Not at full value: reserves not approved by the competent authority under Law 54/2024 have no legal extractability, so valuation must exclude them or discount them heavily as geological expectation; buyers commonly make reserve approval a transaction condition precedent.
Does environmental risk reduce a mine’s value?
Yes, quantifiably: rehabilitation cost for mined-but-unrehabilitated area, deposit shortfalls and accrued pollution risk are deducted directly from value or secured through purchase-price holdback until the duties are clarified.
Does buying shares in a mining company need a mining-right transfer procedure?
Ownership change via share purchase still must be screened under investment and minerals law: transferring an investment project/mineral exploitation right under Law 54/2024 requires meeting the corresponding conditions and approval procedures, and cannot be treated as a purely private share deal outside regulatory reach.
This article has been quality-reviewed by the FLAW AI Legal Council