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caliche rock gold ores

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「Caliche Wikipedia」

Caliche (/ k ə ˈ l iː tʃ iː /) is a sedimentary rock, a hardened natural cement of calcium carbonate that binds other materialssuch as gravel, sand, clay, and silt.

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「Red Sand Vs Caliche GOLD PROSPECTING Nugget」

Turned out this caliche layer barely had any, but the top 12" with the red sand contained most of the gold. I'm wondering if anyone has had any luck getting gold from caliche and whether the caliche tends to be a totally different material than the red sand. I had thought caliche was a form of calcium carbonate left over from the rains.

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「How Is Gold Extracted From Gold Ore? Sciencing」

The ores sometimes contain as little as 5/100 of an ounce of gold per ton of rock. In all methods of gold ore refining, the ore is usually washed and filtered at the mine, then sent to the mill. At the mill, the ore is ground into smaller particles with water, then ground again in a ball mill to further pulverize the ore.

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「Caliche: Mineral information, data and localities.」

Andean sulphur miners sometimes use it for white sulphate crusts created by acid fumarolic alteration of volcanic rocks. In the American Southwest this name is also commonly used to refer to crusts of carbonate (calcite) recently deposited on rocks and in seams, and as a term for soils in semiarid areas...

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「Gold from the caliche AZO's: Metal Detecting Gold」

It was a solid hunk of caliche that had no obvious signs of gold. I set it down on the ground and smacked it with a rock. The lump cracked open and revealed a beautiful yellow color inside! A few more hits with the rock and finally my prize was free. It ended up being a lovely nugget weighing 2.5 grams.

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「Photos of gold ores, quartz, telluride gold ore and gold」

Other minerals, like sphalerite, pyrrhotite, magnetite and hematite sometimes carry small amounts of gold as well. Gold also occurs as tellurides such as calaverite. Common gangue minerals in gold ores include quartz, fluorite, calcite and pyrite, but many others can be found in smaller amounts.

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「Caliche: Also known as calcrete, hardpan, and duricrust」

Caliche layers in aquifers can result in the stratified flow of groundwater. Caliche development can incorporate gold, gemstones, and other valuable minerals. Caliche porosity can serve as the deposition site of valuable secondary minerals, including ores of uranium and vanadium, and gem materials such as turquoise and malachite.

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