Down payment money help.

[Fred Bear]

I'm new to bigger pockets. I was practicing with the with the differnt deal analyzation tools when I  came a cross what I think is a good deal. It's a 4 plex that up for auction in 5 days. 4plex in the area go for around $122,000. The average rent is $500 to $650 a month. The auction wants %20 down at the end of bidding. I have $20,000 tie up in silver, but I don't want to sell it and then not get the house. Any idea on how I can come up with the down payment with out selling the silver outright. Have you here of hard money leander holding solver for collateral.