Below are daily charts of the S&P 500 and the gold miners index ETF, GDX.

Right now, it seems as though these two are trading inversely for the most part. Odds are we see a gap down Friday in the stock market and a gap up in GDX.

This should be followed by a strong rally for stocks into Monday and a strong drop in GDX. Overall, the stock market looks lower into April 21 with gold stocks trading higher.