The Manila Galleon, silver and Guanajuato: the first global supply chain ran through the Bajío

Historical note · History series

On 8 October 1565, the galleon San Pedro sailed into Acapulco Bay after 129 days at sea from the Philippines. Andrés de Urdaneta had found what no one else had managed: the tornaviaje, the return route from Asia to the Americas, riding the Kuroshio current north and the westerlies east. That route gave birth to the Nao de China — the Manila Galleon — which for 250 years tied Asia, the Americas and Europe into a single trading circuit.

What travelled from Acapulco to Manila was, almost exclusively, silver. And much of that silver came from one place: Guanajuato.

The vein and the route

Silver was found at Guanajuato in 1548; two years later, in 1550, Juan de Rayas struck the Veta Madre, the mother lode that would shape the city for three centuries. In 1554, in Pachuca, Bartolomé de Medina perfected the patio process — amalgamating silver with mercury — the technology that made medium-grade ore profitable at industrial scale.

The silver did not travel alone. It went down the Camino Real de Tierra Adentro to Mexico City, where it was assayed, taxed and minted as the real de a ocho, the piece of eight. From there, part went on to Veracruz and Seville; part took the road to Acapulco and Manila.

Why China wanted silver

In 1571, Miguel López de Legazpi founded Manila. Historians Dennis Flynn and Arturo Giráldez use that year as the birth of global trade: for the first time, every populated continent was exchanging goods directly and continuously.

The engine was on the other side of the Pacific. Around 1580, the Ming dynasty’s Single Whip reform consolidated taxes and required them to be paid in silver. The world’s most populous empire monetised its economy on a metal it did not produce in sufficient quantity. In China, silver was worth more relative to gold than in Europe or the Americas; the arbitrage was enormous.

The galleon carried silver west and returned with silk, porcelain, ivory, spices and cotton. The Metropolitan Museum of Art estimates that about one third of the silver mined in New Spain and Peru was diverted to the Far East along this route.

A monopoly with quotas

The trade was so profitable that Seville’s merchants lobbied to restrict it: they feared American silver would flow to Asia instead of Spain. In 1593 the Crown limited the route to two galleons a year, with caps on cargo value. The result was predictable: ever-larger ships — up to 2,000 tons — systematic overloading and smuggling. The Acapulco Fair, held when the galleon arrived, became the most important wholesale market in the viceroyalty.

Guanajuato’s bonanza

Guanajuato peaked in the eighteenth century. The Valenciana mine, which Antonio de Obregón y Alcocer reopened on credit from 1760, hit bonanza in 1768. In 1780 Charles III made him Count of La Valenciana; its church of San Cayetano (1765–1788) remains one of the high points of Churrigueresque Baroque.

According to UNESCO, which inscribed the city and its mines as a World Heritage Site in 1988, by the eighteenth century Guanajuato had become the world’s largest silver-extraction centre. In 1803, the year Alexander von Humboldt visited, La Valenciana employed some 3,100 people: 1,800 underground and more than 1,300 men, women and children in haulage, sorting and milling.

The mine was also a regional system. A 1792 census shows that about 40% of La Valenciana’s workers came from Bajío towns. The haciendas of Celaya, Salamanca, Irapuato and León supplied the maize, wheat, tallow, leather and mules the mines consumed. The Bajío was the mines’ granary before it was anything else.

The silver that stayed in China

The piece of eight minted in Mexico became the reference currency of Asian trade. Chinese merchants accepted it for its consistent fineness and weight, and stamped it with verification marks — chop marks — as it changed hands. When China standardised its own silver coin in 1889, the yuan was set at par with the Mexican dollar. In Hong Kong, the Mexican dollar remained legal tender until 1935.

For more than three centuries, a coin made from Bajío silver was the dollar of the Pacific.

Both ended at once

On 28 September 1810, Miguel Hidalgo’s insurgents stormed the Alhóndiga de Granaditas in Guanajuato, with miners from La Valenciana among them. Production at the mine was suspended that same year. In 1812, with the roads cut, a provisional mint opened in the city itself so silver would not have to be sent to the capital.

The Manila Galleon did not survive the war. The last galleon, the San Fernando — also known as Magallanes — closed the route in 1815. The mine and the galleon stopped almost together: they were two ends of the same chain.

The takeaway

1. The Bajío has been the first link in a global chain before. Guanajuato’s silver was not priced in Guanajuato: its value was set by Ming China’s tax demand. Today, the corridor’s auto parts and appliances are not priced here either. Exposure to the route — not just to the mine — is the risk to manage.

2. Regulating the route matters as much as the resource. The 1593 caps did not protect Seville; they produced overloaded ships and smuggling. Quotas, permits and infrastructure bottlenecks end up redistributing value, rarely stopping it.

3. What stayed was the infrastructure. The silver left; the city, the roads, the churches, the haciendas and a regional economy organised around the mine remained. That is the question the Bajío is asking again with nearshoring: how much of the value moving through the corridor turns into assets that stay.

Bajío Ventures is a Mexican energy infrastructure investment group based in Guanajuato. We originate and structure USD 5–50M projects across the Bajío corridor.

Colonial production figures vary widely between sources; this note uses only institutional (UNESCO, the Met) or peer-reviewed formulations, and leaves out the unsupported world-share percentages often attributed to a single mine.

Sources: UNESCO — Historic Town of Guanajuato and Adjacent Mines · The Metropolitan Museum of Art — The Manila Galleon Trade (1565–1815) · Scielo / Relaciones — El trabajo en las minas de Guanajuato durante la segunda mitad del siglo XVIII · Javier Mejía — The Economics of the Manila Galleon (NYU Abu Dhabi, 2019) · South China Morning Post — How Spanish-Mexican silver shaped China and Hong Kong’s currencies · Mexican Studies/Estudios Mexicanos — La Casa de Moneda de Guanajuato, 1812–25 · Wikipedia — Manila galleon · Wikipedia — Valenciana Mine