"All of them have also been issued show-cause notices which asked them why action should not be taken (against them)," newly appointed Mines Department Director Prasanna Acharya said.
Sources said that the step to cancel mining licenses was essential to temporarily plug the illegal extraction of ore and export, which a majority of the ore dealers indulge in.
"There were large-scale irregularities in the issuance of licenses to these operators by the mines department. There were scores of cases where the addresses of the ore traders were fake," an official said, adding that the increase of illegal mining in Goa was directly proportional to the rise in the number of ore traders registered in the state.
On April 2, the Goa government had suspended Mines Director Arvind Lolienkar, whom Parrikar had accused of illegalities and pandering to the illegal mining lobby.
The Justice MB Shah Commission into the illegal mining mafia in Goa had also said that a large number of iron ore traders were responsible for illegal mining in the state.
Goa's traditional mining industry was earlier dominated by a few hand-picked families who controlled the business with an iron fist until the 2000s, when the infrastructure boom in China fueled unprecedented mining in the state.
In the last year, Goa exported more than 50 million tons of iron ore.