The Justice M.B. Shah Commission's estimate of Goa's mining scam being a whopping Rs 35,000 crore is based on a wrong survey and its real extent is unlikely to be more than Rs 50 crore to Rs 100 crore, Chief Minister Manohar Parrikar said on Wednesday.

"The Shah Commission report is based on survey carried out by hand-held gadgets... They did not do a proper survey. They should have done a proper survey," Parrikar told the assembly during Question Hour in reply to a question by former Chief Minister and Congress legislator Luizinho Faleiro.