Enrichment of Mineral Deposits by Weathering—Part II
April 2016 by Chris RalphWhile both zinc and lead deposits also are enriched by the surface weathering process, in part two we will look at the enrichment process for copper and also gold deposits, and at the interpretation of leached outcrops to figure how rich the concentrated deposits below them may be.
When my field assistant Jay Roberts and I entered the mine, it appeared as if someone just walked out of the mine, turned off the lights and never returned.
It was the middle of winter and the valley was covered in snow, making prospecting a matter of sinking shafts in the ground.
A treasure-seeking young man whose name will forever remain anonymous made the months-long journey either over land or by sailing ship to California after word spread about the gold strike in 1849.
Gold has always been noted to have an affinity for quartz to such a degree prospectors almost always dig on quartz veins in a search for the precious metal.
The big interest to prospectors thinking about the effect of erosion is not what might happen long into the future, but what they might find in the rivers later this summer when the water levels go down.
In this case, signs of gold were found at the bottom of the alluvial and then traced in a triangle up the face of the mountain until they stopped—that is where the digging began.
There are a large number of different kinds of gangue minerals, and each of them has its own tale to contribute to the story of the chemistry and geology of a deposit.
The Bawl Mill • Legislative and Regulatory Update • Ask The Experts • Ask The Experts • Ask The Experts • Dry Washer, Wet System or Metal Detector? • Multiple Use Lands, Symbiotic Relations and Conflict Resolution • Vendors Announced for Gold Prospecting and Mining Summit • The Tombstone Silver-Lead District, Arizona • Sold: 87-Ounce Nugget • Melman on Gold & Silver • Mining Stock Quotes and Mineral & Metal Prices