thanks Butcherboy. But what happens if the air temp cools by the time it reaches the top of the tower and equals the outside temp at that height
CUF CuFe sells its Crossroads gold royalty to Northern Star for $4M cash; says better than waiting for mine launch
Week 46 Wrap: Copper hits 2mth low as Trump threatens net zero pace; US rally fades; HotCopper’s picks
