(July 11, 2023) Taking a cue from the Lydian sun lion and storm bull coin which contrasted chaotic versus orderly powers, the Athenians with their silver mine at Laurium (Lavrio) did something similar. They contrasted the sun lion (healthy sun) with a drought causing sick sun which later came to be called the Gorgon.
This coin seems to have been the first coin ever struck to have an engraved design on both sides (obverse and reverse, heads and tails).
The mine at Laurium seems to have been a source of silver as early as 2000 BCE. Commercial level production commenced in 483 BCE with the discovery of rich vein of silver in the vicinity of modern Ag. Konstantinos, otherwise known as Maronia. The mines were rented out to various individuals for a fixed percentage of the production. The most difficult work, including the extracting underground ore came to be done by slaves. This suggests the right to mine was opened up to open bidding. Those able to mine the cheapest and promise the state the highest percentage got the contract
Lavrion Ancient Silver Mines. Online at: https://ancient-greece.org/archaeology/lavrion.html
Shutterfly, Michael (Dec 16, 2020) The Tetradrachms of Athens (and Athena). Online at: https://coinweek.com/the-tetradrachms-of-athens-and-athena/