specific gravity test for gold nuggets

The Specific Gravity Test is 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.

Nugget weighed in air weighs 96 grams

Nugget suspended in water weighs 74.5 grams

96 - 74.5 = 23.5
96 divided by 23.5 = 4.17 (the specific gravity of the specimen)
4.17 - 2.63 (the average specific gravity of quartz) = 1.54
1.54 x 23.5 = 36.19.
36.19 divided by the constant 25.97 = 1.39 ounces of contained gold
1.39 ounces x 31.103 = 43.23 Grams of contained gold.

For a more detailed description of how to set up to weigh your nugget in water click this link

The specific gravity for quartz is 2.60 - 2.65.



What is specific gravity? Specific gravity is simply the weight in grams of one cubic centimeter of a metal. Here are specific gravities and other properties of a few more metals:
Metal Symbol Specific Gravity Melting Point (F) Melting Point (C)
Copper Cu 8.96 1981 1083
Gold Au 19.32 1945 1063
Iron Fe 7.87 2802 1539
Lead Pb 11.34 621 327
Nickel Ni 8.90 2651 1455
Palladium Pd 12.00 2831 1555
Platinum Pt 21.45 3224 1773
Silver Ag 10.49 1761 961


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