Others use a different kind of twig for each metal when they are seeking to discover the veins, for they employ hazel twigs for veins of silver; ash twigs for copper; pitch pine for lead and especially tin, and rods made of iron and steel for gold. All alike grasp the forks of the ...
The W-Te mineral and coloradoite are both believed to be the first reported occurrences in Arizona. The presence of inclusions of rare, brittle, and readily oxidized minerals within the placer gold grains suggest this gold formed within a hydrothermal lode source at medium to high temperature, ...