Before Ibarra arrived, another Spaniard had already glimpsed what lay beneath this ground. Between 1551 and 1552, Diego Fernandez de Proano explored the Zacatecas region, searching for a legendary mineral-rich hill. He found one -- not the hill of legend, but a promising prospect he named Cerro de Proano. He reported his discovery to the Viceroy in Zacatecas, but the response was indifference. Proano's Hill was forgotten for years. When mining finally began in earnest, the hill proved his instincts right: between 1682 and 1757, the mines on Proano's foothills produced steadily. Then the shafts reached fifty meters and groundwater flooded in. Unable to pump the mines dry, the owners defaulted on loans to the Spanish Crown, which seized the properties and appointed new administrators. The mines sat idle. It would take new technology and new capital to reopen what the water had claimed.

The early decades after Fresnillo's founding were violent. Guachichil warriors -- nomadic and formidable -- raided the settlement repeatedly, inflicting heavy losses. The Viceroy Martin Enriquez de Almanza ordered the construction of a presidio, assigning Captain Rodrigo Rio de Loza and eight soldiers to defend the town. The military outpost stood where the municipal palace stands today. But Fresnillo's enduring fame owes less to its soldiers than to its saints. In the nearby mining town of Plateros, Spanish miners in the late 1690s reportedly found a silver crucifix in a wooden crate, its origin unknown. Devotion to the find led to the cross-Atlantic transport of a statue of Our Lady of Atocha, depicting the Virgin Mary holding the infant Jesus. That infant figure became the Santo Nino de Atocha -- the Holy Child of Atocha -- and pilgrims have traveled to Plateros to pray before it ever since.

Believers attribute miracles to the Holy Child. Those who feel their prayers were answered return with gifts of gratitude -- so many gifts that in 1883 a separate building was constructed to house them. The shrine at Plateros remains one of the most visited pilgrimage sites in Mexico, drawing families from across the country who attend mass and offer devotion to the small statue they consider a guardian of miners. The tradition reflects something essential about Fresnillo: this is a city where the sacred and the industrial have always been intertwined. The coat of arms tells the same story -- the Virgin of Candlemas on one side, weapons of conquest on the other, and at the bottom the spring and the ash tree, with Proano's Hill rising beneath September clouds. The Latin inscription reads: Orat Atque Laborat Ab Urbe Condita. Since its founding, a city that works and prays.

The Mina Proano, now operated by the Penoles mining company, remains one of the world's most productive silver mines. Agriculture -- corn, peppers, tomatoes -- supplements the mining economy, and surrounding villages send their harvests to Fresnillo's markets. But modern Fresnillo carries shadows alongside its silver. In 2013, the city made history by electing Mexico's first openly gay mayor, Benjamin Medrano, in a region not known for progressive politics. In 2020, the murder of a twelve-year-old girl sparked protests that burned the municipal palace. By 2021, surveys found that 96 percent of Fresnillo's residents felt unsafe, a figure driven by cartel violence that the New York Times documented under the headline 'We're Living in Hell.' The city that works and prays now also endures -- its centuries-old resilience tested by pressures its founders could not have imagined.