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While this step is optional, it can help you determine where the most gold is and also provide encouragement that gold is actually there.
Visually examine the quartz looking for gold. Keep your eyes peeled for loose quartz that has already eroded out of the surrounding rock, as these pieces may also contain gold.
Before collecting rocks, and especially before using your hammer and chisel, find out what the local laws are regarding prospecting and collecting.
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Use your hammer and chisel to remove the gold-laden quartz from the surrounding rock. Things You'll Need. About the Author. Photo Credits. Find Your Next Great Science Fair Project!
Veins grow in thickness by reopening of the vein fracture and progressive deposition of minerals on the growth surface. Veins generally need either hydraulic pressure in excess of hydrostatic pressure to form hydraulic fractures or hydrofracture breccias or they need open spaces or fractures, which requires a plane of extension within the rock mass.
In all cases except brecciation, therefore, a vein measures the plane of extension within the rock mass, give or take a sizeable bit of error.
Measurement of enough veins will statistically form a plane of principal extension. In ductilely deforming compressional regimes, this can in turn give information on the stresses active at the time of vein formation.
In extensionally deforming regimes, the veins occur roughly normal to the axis of extension. Veins are of prime importance to mineral deposits, because they are the source of mineralisation either in or proximal to the veins.
Typical examples include gold lodes , as well as skarn mineralisation. Hydrofracture breccias are classic targets for ore exploration as there is plenty of fluid flow and open space to deposit ore minerals.
In many gold mines exploited during the gold rushes of the 19th century, vein material alone was typically sought as ore material.
The difference between 19th-century and 21st-century mining techniques and the type of ore sought is based on the grade of material being mined and the methods of mining which are used.
Historically, hand-mining of gold ores permitted the miners to pick out the lode quartz or reef quartz, allowing the highest-grade portions of the lodes to be worked, without dilution from the unmineralised wall rocks.
Today's mining, which uses larger machinery and equipment, forces the miners to take low-grade waste rock in with the ore material, resulting in dilution of the grade.
However, today's mining and assaying allows the delineation of lower-grade bulk tonnage mineralisation, within which the gold is invisible to the naked eye.
In these cases, veining is the subordinate host to mineralisation and may only be an indicator of the presence of metasomatism of the wall-rocks which contains the low-grade mineralisation.
For this reason, veins within hydrothermal gold deposits are no longer the exclusive target of mining, and in some cases gold mineralisation is restricted entirely to the altered wall rocks within which entirely barren quartz veins are hosted.
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Unsourced material may be challenged and removed. Main article: Quartz reef mining. Retrieved 1 November Nevada Outback Gems.
Structural geology. Strike and dip Rake Inclinometer Brunton compass Stereographic projection Orthographic projection. Joint Exfoliation joint Vein Dike Columnar jointing.
Thrust fault Detachment fault Disturbance Fault mechanics Fault trace Fault scarp Transform fault Transfer zone Cataclastic rock Cataclasite.
Rock microstructure Crenulation Cleavage Slickenside Pressure solution Stylolite Compaction Fissility Oblique foliation Tectonic phase Tectonite.