The light grey Fib-arc placed on the impulse move from $15-21 says “not too much longer” for this Silver pullback, which has been consolidating since the beginning of July.

Silver Weekly

From an EWT standpoint, wave 4’s typically correct 38.2%, and this wave (iv) has already corrected 50%.  Of course, that’s just a “tendency” – not a “rule” – so further downside to 68.2% ($17.89), and/or trendline support (green dotted line) is certainly possible!

Also, just fyi: wave c = a*1.618 = $17.67