Look at the rock with magnifier lens, if you don't see gold its not worth considering. If you want to go further you would have to crush it to the size of flower. Then add something to lessen the surface tension, like a detergent or trisodium phosphate. Then wash it in away that the denser grains ...
not far off from that 25lb nugget found in 1850 buy the the Missourians not even a mile off. so on i found a little gold panning around in this creek stream bed and was uncovering a big rock and found within in it a couple quartz veins 3 of them to be exavt about 3ft long no more than 6 incses wide some much smaller could this be the natural ...
Rock Contact Zones and Faults: Many quartz veins and other hard rock gold deposits occur in "zones" along faults or at the contact of two different types of rock. Correct Topography: As a general concept, the coarser gold does tend to hang up farther upstream.
The single most common gold-bearing matrix in the world as a whole is the quartz vein.I'm no geologist, but as a hard-rock or placer gold miner I do know that having a basic understanding of the geological characteristics of auriferous quartz veins is important.
Most prospectors, when they think of hard rock gold deposits, think of quartz containing particles of gold. While gold deposits can be things besides quartz veins, gold is certainly found in the quartz of veins cutting through various types of rocks.
Sometimes a rock is called a migmatite because of the presence of segregation quartz veins in it, but this is a misnomer: segregation quartz forms at hydrothermal conditions, while in migmatites the segregation of minerals into vein-like structures is caused by partial melting of the rock.
Visible gold in quartz is relatively uncommon: most productive gold mines are either dredge based for alluvial (moved by water) deposits, or cyanide float or mercury extraction of microscopic gold particles, either distributed in soil or hard rock (often quartz bearing) that are too small to see with the naked eye.
Look for gold and gold-containing quartz rocks in areas where volcanic hydrothermal activity has taken place in the geologic past. These areas include the regions around old gold mines and rock outcrops upstream from placer gold deposits where gold has eroded out of its bedrock, washed downstream and accumulated in and near stream channels.
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