How are mining costs declining when ore grades are declining? Is the price of diesel/oil really so low that it's having a large effect on lowering their costs?

I don't see Silver at $26 any time in 2019 - maybe $19 by years end. Actually, I believe gold will run to $1400 in order for us to see $19 silver. That would put the Gold:Silver ratio back down to about 75:1. After that, silver might be able to go on another run, but it might take another 3 or 4 years?