The three member team, headed by committee Chairman P V JayaKrishna visited three areas where three firms are engaged in mining activity, perused mining maps and other records, official sources said.
It also held discussions with officials of forest, mines and revenue departments, they said.
The Committee will continue its inspection tomorrow also.
CEC will submitt its report to the Supreme Court by the first week of April.
Following a writ petition filed by "Samaj Parivartana Samudaya", the Supreme Court had on February 25 asked CEC to submit a report on the alleged illegal mining in Karnataka within six weeks.
The CEC held its first hearing in Delhi on March 10 and based on the deliberations, it had sent a nine-page questionnaire to the State government on 14 points.
Yesterday, the CEC held a meeting with Karnataka Chief Secretary S V Ranganath and sought details of the steps taken to curb alleged illegal mining in mineral-rich Bellary district.