The Centre-appointed Commission of Inquiry's report said the companies were mining in as many as 40 leases in West Singhbhum, including thick Saranda forests, in violation of rules and regulations between 1994 and 2006.
It also alleged "flagrant misuse" of rules by various firms, windfall profits to them due to meagre royalty rates, diversion of forest land and granting undue favours to companies like JSW Steel. Companies like Usha Martin allegedly paid "levy" to extremists, it said.
"An approximate quantity of 119 million tonne (MT) iron ore for an approximate value of Rs 14,403 crore and an approximate quantity of 0.1 MT of manganese ore for an approximate value of Rs 138 crore is extracted illegally and without lawful authority," the Commission said.
The one-member panel in its report on illegal mining in Jharkhand running in four volumes recommended that "the said amount should be recovered from the lessees under ... Mines & Mineral Development and Regulation Act, 1957."
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The Commission has recommended termination of 24 leases across 8,898 hectares in Saranda Forest, saying 7,652 hectares fell in forest land and grant of fresh lease through public auction subsequently.
It recommended that the government should ensure that there should not be any further depletion of Saranda forest reserve as it is also notified Elephant Reserve and a proposed conservation reserve.
It said authorities allowed lessees to operate the mines without lawful authority whereas "No authority including central government and state government did have the power to condone or extend the period without proper grant of lease withing time provided under relevant rule prevailing at the time."