As an economist, I don't think you really map out your plans very well; all I could possibly imagine from the few things I understood from your content is more debt. Borrowing money to invest in crypto currency without having a primary source of income is something that's highly discouraged because it can endanger you and put you into more debt. When doing your calculation, did you not look at the negative side of investment? Your analysis is actually not complete if you don't do a proper calculation of risk.
How long do you actually think that the person who lends you the money can wait for you to pay it back without you incurring more debt to your head, and the lender might actually sell off your collateral if you don't meet up and become a loan defaulter?
I will sincerely advise you never to take a loan from anyone just to invest in crypto currency with the hope of paying it back with your profit made from the investment. It's actually a very bad investment strategy; it might work for others, but the chances of it failing for you are very high.
As a financial advisor, I fully agree with you. First of all gold and silver aren't good investments typically. They are great hedges, but investment wise, not so much. This guys is also banking on gold/silver/bitcoin are certainly going to increase in value, which there is simply not guarantee for.
OP - I think this is a very risky proposition you're making here and I woudl think twice about doing so.