Silver surpassed $50 an ounce for the first time on Thursday amid a supply shortage and an economic environment that bolsters precious metals. Spot silver briefly rose above $51 an ounce during Thursday's trading session after breaking the $50 an ounce threshold earlier in the day. It has since dipped back below $49 a share where it opened on Thursday. The last time silver traded around these levels was January 1980.Spot gold prices fell 2% on Thursday after they crossed the $4,000 on Wednesday for the firs ...