The ore consisted of quartz, in which, above the 250-ft. level, the iron-minerals were largely oxidized and some free gold was visible; below that level
We have already devoted two previous memoirs to this question. In the first we collated and discussed the existing literature on the subject; in the
In the zeal for opening up new ore-bodies, or for extracting the ore from attractive bodies already opened up, we very often lose sight of
Although the bromo-cyanide or Diehl process for the extraction of gold from its ores is used on several of the Kalgoorlie mines, very little information
Some epithermal veins, worked for gold in the upper, enriched zones, consist mainly of base-metal minerals below the enriched zone. The Smuggler vein at Telluride,
The volcanic source of gold deposits is also most clearly indicated in the Cripple Creek district, Colorado, where the deposits of commercial grade are either
Supposing that a claim is suitable for hydraulic sluicing, the first thing to do would be to ascertain what is the probable volume and pressure
It seems desirable to remove zinc more completely than can be done by acid-treatment, and also to obtain it in a form at once available
In considering the prospective value of dredging ground there are many conditions to be taken into account besides its actual gold content; it is like
The working of gold alluvial deposits by dredging has from all times been a popular form of mining, not only from the simplicity of its operations, but