Kamat has been facing inquiry for condoning delay in obtaining renewal for a mining lease held by Prafulla Hede, a mining firm owner, in South Goa. Kamat was then chief minister.
Talking to reporters afterwards, Kamat said he answered all questions.
"God is with me, he knows that I am not part of any scam," he said.
Superintendent of Police (Crime Branch) Kartik Kashyap refused to divulge any details of the interrogation.
A case was filed against Hede in September 2014.
Justice M B Shah Commission, which probed the rampant illegal mining in Goa, had observed in its report that several mining companies were allowed to fraudulently use the provision of condoning the delay in renewal of mining lease.
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