commodity total bid and ask quantity
1000 people(it could be much lesser as you are assuming that 1 person = 1lot) at that particular point could have placed buy orders for Zinc. But that doesn’t mean because only so many buy orders are open, that means only those are trading Zinc mini. The important number to look at is open interest, which shows how many lots are currently open in that contract. You can read about futures here: http://zerodha.com/varsity/module/futures-trading/
Thank you so much Nithin