Ruben Montoya, historian, on Hispania: 'Its mines represented the financial backbone of Rome, funding its armies and sustaining its monetary system'

The 2nd century B.C. was a golden era of expansion and conquest for Rome. Following the fall of Numantia, Roman soldiers flocked to Hispania, drawn by its vast riches. However, the most valuable treasure lay beneath the earth. Historian Ruben Montoya has published an essay detailing the Roman exploits in the Iberian Peninsula, highlighting how the region served as the primary engine for the Roman economy and military machine during both the Republic and the Empire.

Historian Polybius, visiting the mines of Cartagonova in 151 B.C., noted that forty thousand men worked regularly, providing the Roman people with a daily income of 25,000 drachmas—a massive fortune for the era. Montoya explains that these mines were the financial backbone of Rome, funding its armies and sustaining its currency. Beyond mineral wealth, the historian notes that the commercialization of olive oil and wine provided additional revenue streams that fueled the Roman state's expansionist ambitions.

Before Rome, Carthage had already identified the strategic importance of the Iberian Peninsula. Having lost Sicily and Sardinia during the First Punic War, Carthage viewed Iberia as its economic and military salvation. Both powers saw the region as a financial pantry, leading to a brutal colonization process that culminated in the formal creation of Roman provinces by 197 B.C. This struggle for control was essentially a battle for the resources required to secure hegemony over the Mediterranean world.

Following the conquest of Cartagonova in 209 B.C., the Roman focus shifted to the Sierra Morena region for lead and silver, while the Riotinto mines provided iron, mercury, and tin. This extraction model was managed indirectly through publicani and Italian entrepreneurial societies, which generated colossal wealth for the public treasury. The impact of this extraction was profound, affecting local populations and reshaping the landscape to serve the insatiable demands of the Roman capital and its far-flung legions.

From 27 B.C. through the 3rd century A.D., the focus shifted to the northeast, where massive operations like Las Médulas utilized the 'ruina montium' technique to extract gold, ensuring the stability of the 'aureus'. Montoya concludes that Hispania transitioned from being a mere source of plunder to the primary industrial motor of the Empire. Future archaeological studies continue to reveal the scale of this exploitation, confirming that the Roman Empire's longevity was inextricably linked to the mineral wealth extracted from the Iberian soil.