During extensive field studies of ancient copper production at Faynan in 1963 and between 1984 and 1997, 1395 coins were collected, of which 1013 have been identified in detail. Of these, 103 coins had been minted between about 300 BC and AD 312. They include 7 Ptolemaic, 6 Jewish, 40 Nabataean, 17 Roman provincial and civic and 9 Roman imperial coins. 609 coins have been dated between 312 and the severe earthquake of AD 363. Field evidence suggests that during this period a Roman garrison at Faynan intensified the production of copper. The following 60 years are represented by 643 coins, the next 225 years by only 18 coins. No coins have been found from the periods AD 655 to 1210 and AD 1360 to 1800. Eleven Islamic coins date the last major efforts to revive copper production to between AD 1210 and 1360.
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Kind et al. (2005) studied this question.
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