Good game plan or bad game plan??? 49 yr old ...

Good game plan or bad game plan??? 49 yr old single male owns 11 single fam houses. Rents net $5000. mo income. Only have 2 mortgages, each at 40% LTV. I want to refinance which takes interest from 7.0% for 22 years till payoff, to 5.50% for 30 yrs. current combined mo payment $1200. Refinanced mo payment $1450. Purpose? For a 70% LTV that I can pull cash out at closing approx $60k and put into physical silver to hold for 3-10 years to catch gains in the precious metal bull market. After which, cash out, pay off total both mortgages and still have some extra cash based on a projected multi year gains in the silver market. What are your insights into this scenario that I may find supporting or a hazard warning to my financial wellbeing?? Thank you R.E.