Abstract Late in the sixth century BCE, the ancient Athenians overthrew the previous tyrant rulers and adopted a new democratic form of government militarily establishing themselves as a regional power. They constructed a fleet which played a crucial role in defeating the Persian invasion of 480/79 BCE and led to their creation of a naval-based empire. A key funding source for the ships was silver from the domestic mines at Lavrion situated in the south-east corner of Attica (Hdt. 7.144; Ath. Pol. 22.7). The current consensus based on earlier metal analysis is that the Athenians must have found and exploited the rich, so-called ‘third contact’ silver mines in 520–515 BCE, a discovery that led to the introduction of the larger tetradrachm monetary unit (Kraay, 1956) and the iconic ‘owl’ coin ‘type’ (Picard, 2001) as a branded medium for exporting silver. Here, we present new lead isotopic and elemental abundance data for 52 archaic Athenian owls (pre-479 BCE) combined with previously published legacy data for 12 other owls. The results show that only a small proportion of the coins were wholly struck from Lavrion ore or other discrete sources while most of the coins were struck from Lavrion ore mixed with ore from a single or homogeneous, geologically older source. Crucially, this was not the multitude of external sources used for the preceding Wappenmünzen series. We deduce that the discovery of the third contact only occurred shortly before 483/2 BCE, precisely as claimed in the literary sources, at which point Lavrion silver came to represent the bulk of the supply. This forces a reappraisal of the current paradigm since it seems that there was no abrupt and complete change of ore source to Lavrion, and therefore this cannot be connected with the introduction of the owl coin type. It also impacts our understanding of the very low gold content of Athenian owls compared with the earlier Wappenmünzen series, which should be attributed to the replacement of ore sources.
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