Opening (Margin): GDXJ January 21st 36/46 Short Strangle

... for a 1.12 credit.

Comments: One of the only underlyings at the top of my high implied exchange-traded funds list that I'm not already in with 30-day at 39.3%.

Selling 18 delta-ish premium on both sides. 1.12 on buying power effect of 4.13 (on margin); 27.1% ROC at max; 13.6% at 50% max.

Will look to take profit at 50% max; manage sides on approaching worthless/side test.