Small-Scale Hard Rock Mining With Water Recycling
March 2015 by Bruce MannOnce I have established the presence of gold in the sample, I collect five-gallon bucket quantities of the rock material for processing back at my shop.
Imagine you have located a source of virgin placer ore containing immense gold value. Now imagine that there is a 10-ton monolith of extremely hard gneiss in between you and payday.
The same day, while two of us were heading to Vancouver to attend the mining convention, two others from our team were headed to Nevada to begin loading the millsite equipment.
The next hurdle to jump was whether the trommel motor would start again after sitting on the desert for six years without being started. The last time it had taken a three foot pipe wrench to bust it loose.
There is reason to believe these stream valleys are still rich with gold, silver and copper.
I thought it might be worthwhile to take a look at the basics of this important mineral separation technique and how a miner can use it to recover the values out of an ore.
The favorable geology of the northeastern and central parts of the Seven Troughs Range are the parts most interesting to prospectors. They are underlain by a thick sequence of Tertiary volcanic rocks, mostly rhyolites and andesites.
For the prospector, knowing what oxidized hydrothermal alteration looks like in the field is an important exploration tool.
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