An earlier module showed that eight countries do not make eight risks, because hostile measures spread by political imitation and financial contagion. The common factor there was political. This one takes a common factor of another species, harder to see because it appears on no country risk map: geography. Ten mining contracts spread across three countries whose entire output leaves by one rail corridor constitute a single exposure, and the geographical spread table that reassures the committee is precisely what conceals it.
The starting point is an industrial obviousness insurers absorb poorly: an asset is worth only what it can ship. A mine whose output does not leave is a hole in the ground with fixed costs attached, whatever the quality of the deposit and whatever the security of the mining title. The sum insured covers the asset, real value covers the asset plus its ability to evacuate, and those two figures never diverge while the corridor works.
Then comes the peculiarity that makes this module necessary, and it is almost always discovered at the moment it bites. A corridor crosses countries where the investor owns nothing. Its policies name the countries of its assets, because that is how political risk is underwritten, and the transit country does not appear. A measure taken by that third state, a new transit duty, a requisition of rolling stock, a border closure, industrial action at a port, strikes all ten contracts at once and is covered by no policy, not because it would be excluded but because the country is not insured.
A second consequence follows and it concerns classification. The corridor's operator is frequently a state undertaking of the transit country. Its failure, its unilateral renegotiation, its refusal to allocate rail paths, then fall within sovereign contract breach for whoever contracted with it. But that counterparty is often a third party, a logistics operator or a consortium, and not the mining investor itself. The loss occurs with one party and the contract founding it belongs to another, which leaves the investor with certain damage and no contractual link to establish it.
The exposure calculation must then be redone, because the usual way of doing it is wrong here. A committee rarely adds exposures it believes independent: it takes the largest, or applies a decorrelation. On a shared corridor, simultaneous exposure is the sum of everything that can no longer ship, and not the value of the biggest asset. Ten fifty million contracts sharing one line make five hundred million of exposure on one event, and that figure appears nowhere if the analysis was done country by country.
An aggravation peculiar to chokepoints deserves stating, because it distinguishes this risk from ordinary political correlation. A corridor concentrates causes as much as effects: an administrative measure, a bridge failure, port industrial action, a flood all produce the same result in the same place. Political and physical perils converge on a single point, which makes the exposure insensitive to diversification of causes as much as of countries. It is the configuration where political cover alone protects least, precisely where it looks most complete.
What actually answers that exposure is not always a political risk policy, and the useful professional is the one who can say so. A contingent business interruption cover, responding to the impossibility of shipping whatever the cause, addresses the fact rather than its characterisation and therefore covers the corridor without having to name a country. It has its own limits, notably on duration and on proving origin, and it needs articulating with the political policy to avoid both duplication and a gap. That articulation is designed once, in calm, and is paid for otherwise at the claim.
Three steps close this module and the first reverses a habit. Map the points of passage rather than the assets, and list the states crossed alongside the states owned in. Extend the named countries of the policies to transit countries, which costs little while nothing happens there. And present the committee with simultaneous exposure on the corridor rather than the sum of exposures by country, because it is the only figure describing what the group actually risks losing on one day.
A European mining group holds ten manganese concessions across three southern African countries, for a total sum insured of 620 million euros, covered by three political risk policies each naming one of the three countries. All output without exception is evacuated by a single 900 kilometre rail line crossing a fourth country and ending at a deep water port. The line is operated by a state company of the transit country, under a transport contract with a logistics consortium of which the mining group is not a member. In April 2026 the transit country introduces a transit duty multiplied by six and gives path priority to its own output. The ten concessions run at reduced rates. The risk committee asks why the policies do not respond.
The answer is blunt and must be given plainly before solutions are sought: the policies do not respond because the transit country is named in none of them. The measure is not excluded, it is outside scope, which is worse since there is nothing to argue. Three policies name the three countries where the group holds assets, which is the normal way to underwrite political risk, and the real exposure sat in a fourth country where it holds nothing. The committee must then be shown the figure it has never seen. Its tables present three decorrelated exposures of roughly two hundred million each; the reality is a simultaneous exposure of 620 million on one event, because ten concessions sharing one line are not ten risks. It is the same reasoning as on political correlation, applied to a physical common factor the country map does not show. On classification a further difficulty arises and is worth seeing. The line's operator is a state company, so its decision might fall within sovereign contract breach, but the transport contract binds that company to the logistics consortium and not to the mining group. The group suffers the damage and does not hold the contract founding it. The only contractual route therefore runs through the consortium, which means examining what its own contracts provide and whether it is itself insured, information the group has probably never asked for. Three steps are needed, two of them looking forward. Request at once the extension of the three policies to the transit country, knowing it will be refused or dear now that the measure is taken, but obtaining it for the future. Examine a contingent business interruption cover, responding to the impossibility of shipping without having to name a country, which is the construction that actually answers a chokepoint. And redraw the group's risk map on points of passage rather than on assets, which will take a day and will probably reveal other shared corridors.
- 01An asset is worth only what it can ship: the sum insured covers the asset, real value covers the asset plus its ability to evacuate.
- 02A policy names the countries one owns in, never those one crosses: a transit country's measure is not excluded, it is outside scope, which is worse.
- 03Simultaneous exposure on a corridor is the sum of everything that can no longer ship, not the value of the biggest asset: that figure appears in no country by country analysis.
- 04The corridor operator is often a state undertaking, but the transport contract belongs to a third party: the damage sits with one, the contractual link with the other.
- 05A chokepoint makes political and physical perils converge on a single point: that is where political cover alone protects least, and where it looks most complete.