CompanyGraph
Fresnillo plc
FRES · Mexico
Mines silver, gold, lead, and zinc from seven underground shafts in Mexico and refines the output through its parent company's own smelter.
Fresnillo mines silver, gold, lead, and zinc from vein deposits in Mexico's Sierra Madre Occidental, where all four metals are locked into the same ore body and must be extracted together, then separated on-site by flotation circuits before any of them can be sold. Those concentrates travel directly to the Met-Mex refinery owned by Fresnillo's parent, Industrias Peñoles, so the toll-refining margin that would otherwise go to an independent smelter stays inside the same corporate group. A competitor buying a Sierra Madre mine could not replicate this arrangement with money alone, because the flotation circuits at each mine are calibrated to produce concentrates at the exact specifications Met-Mex is built to receive, and the intra-group pricing relationship between the two depends on a parent-subsidiary structure that took decades to build across both the mining and smelting tiers. The whole chain rests on Met-Mex remaining operational and under Peñoles' control — if the refinery were disrupted or Mexican policy forced a separation of the two businesses, Fresnillo's concentrates would have to find third-party smelters at open-market rates, which would make the economics of sinking shafts deeper than 1,000 metres financially unworkable at current silver prices.
How does this company make money?
Silver and gold are sold as doré bars priced against the London Metal Exchange and COMEX benchmarks. Lead and zinc concentrates go to third-party smelters under separate arrangements where the smelter charges a treatment fee and Fresnillo receives the remaining value of the metal. The company also earns revenue by leasing mining equipment and providing contractor services to other mining operations in Mexico.
What makes this company hard to replace?
Industrial silver buyers sign long-term concentrate supply agreements that specify exact mesh size and purity levels matching Fresnillo's particular flotation circuit outputs. Reformulating processes to accept a different supplier's material is costly and slow. On Fresnillo's side, transferring a Mexican mining concession to a new owner requires federal government approval, which adds friction to any forced change of ownership. The company also has dedicated electrical infrastructure agreements with CFE serving remote mine sites that took years to establish and are not easily transferred.
What limits this company?
At the main Fresnillo mine, the richest ore left to dig sits deeper than 1,000 metres underground. Every additional metre of shaft costs dramatically more to build and ventilate than the metre above it. That rising cost per tonne of rock is what limits how fast the company can grow output — not the machines on the surface or the demand for silver, but the sheer expense of going deeper.
What does this company depend on?
Fresnillo cannot operate without CFE electrical grid connections that power the concentrator plants and underground ventilation systems. It relies on the Grupo México railway network to move concentrates to Pacific ports. Cyanide supplies are essential for the heap leach operations at Herradura and Noche Buena. Mexican federal mining concessions covering each specific claim area must remain in place. And explosives permits from SEDENA are required to blast underground.
Who depends on this company?
Johnson Matthey and other manufacturers who make autocatalysts for vehicle exhaust systems depend on a stable silver supply for electronics uses. Solar panel makers in Asia formulate their conductive pastes to specific silver grain specifications — a shift in those specs would force costly reformulation. Mexican peso stability is also a downstream dependency in the other direction: because Fresnillo pays workers in pesos but earns revenue in US dollars, peso swings directly affect who can afford to keep buying from it.
How does this company scale?
Growth within the existing seven concessions is relatively straightforward — the company can sink parallel shafts or open new levels inside ground it already holds. What does not scale easily is finding brand-new ore districts: any Sierra Madre Occidental property beyond current boundaries requires greenfield development that typically takes five to ten years from discovery to first production, and none of the existing underground infrastructure can be carried over.
What external forces can significantly affect this company?
When the Mexican peso weakens against the US dollar, mining wages cost less in dollar terms, which helps margins — but sharp swings in either direction create planning uncertainty. The AMLO administration's decision to nationalize lithium has raised questions about whether similar moves could affect silver and gold concessions, creating legal uncertainty around long-term mine ownership. Separately, shifts in Chinese solar panel production volumes can move industrial silver demand up or down in ways that have nothing to do with jewelry or investment buying.
Where is this company structurally vulnerable?
If the Met-Mex refinery went offline for an extended period, or if Mexican mining policy forced Fresnillo to separate from its parent Industrias Peñoles, Fresnillo's concentrates would have to find independent smelters at open-market rates. That would erase the integrated refining margin that currently makes the high cost of deep-shaft development worthwhile, and at current silver prices the economics of digging deeper would no longer hold up.