As a side note - this development in zinc batteries looks very interesting. https://www.eurekalert.org/pub_releases/2018-04/uom-ahs041318.php
Week 46 Wrap: Copper hits 2mth low as Trump threatens net zero pace; US rally fades; HotCopper’s picks
AN1 CuFe sells its Crossroads gold royalty to Northern Star for $4M cash; says better than waiting for mine launch