Market Vectors Mining ETF (GDX) gains $2.13 to $58.16 on a good day for the miners after the yellow metal surged $55 to $1707 an ounce. Gold is shining and an noteworthy trade in GDX is a Dec 57 – 60 – 62 call Tree at 21 cents, 15000X. The strategist collected the credit to buy the 57s for $4 and sell the two higher strikes for a combined premium of $4.21 (2.47 + 1.74). The spread offers its best payoff if GDX settles at $60 at the December expiration, which represents a 3.2 percent gain over the next 52 days.