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How do you measure the gold content of ore?

Updated: 8/10/2023
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Rhunter961

Lvl 1
9y ago

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Nitric acid testing kits are available to determine the purity of gold. The Specific Gravity Test (used to calculate the gold content of gold nuggets that contain a mixture of gold and other materials) In this example of the specific gravity test, we use gold mixed with quartz. Simply put, the formula is 3.1 x the weight in water, minus 1.9 x the weight in air: Wet nugget weighs 74.5 grams x 3.1 = 230.95

Dry nugget weighs 96 grams x 1.9 = 182.4

230.95 - 182.4 = 48.55

31.1 = number of grams per ounce

48.55 / 31.1 = 1.56 ounces of gold

Original dry weight = 96 grams / 31.1 = 3.08 ounces.

Subtract the difference between the wet and the dry:

3.08 ounces - 1.56 ounces = 1.52 ounces.

Therefore what is left is 1.52 ounces of quartz.

"Wet" = weight in water - Put container of water (enough water to cover nugget) on scale. Tare (zero) out scale. Hang nugget by string in water. Note weight. The specific gravity for gold is 19.3.

The specific gravity for quartz is 2.65.

The ratio between gold and quartz is 7.28 X.

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15y ago
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9y ago

Only applying methods of analytical chemistry.

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If they were following a streak of visible gold they would follow that streak wherever it lead. If it was ore they would have it assayed and if rich enough in gold content they would start blasting and tunnel through whatever was in the way.


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The mass of 9999 pure gold you get from 1 gram of gold ore is minute. For example, 30g of gold can be extracted from an 860kg block of gold ore.


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