In other words If a one thousand gram sample of ore was measured it would be one fifth the volume of the equal weight of water. You know that the ore weighs five times as much the amount of water that it displaces. As an example let us say that the weight of the sample was three thousand four hundred grams. If the specific gravity of a mineral is 5*0 or five times as much as the water, by taking a one liter sample of slurry and weighing it you can determine the percentage of ore that is in the one litre sample. As an example One liter of water weights one thousand grams. Once you know how much the mineral weights in relationship to the water the rest is easy. This process should not be confused the rock tumblers you see being used in the hobbyist sector. An example is if a mineral that weighs one hundred grams displaces twenty grams of water the specific gravity of the mineral is 5*0 or the mineral weighs five times more than the same amount of water. This will give you the ratio between the mineral and the water. Weigh the water that was displaced by the mineral. To determine the specific gravity of a mineral, you simply take a sample of ore of known size and put it into a volume of water. The standard that was chosen was the weight of water. ![]() ![]() To determine each minerals specific gravity, a standard to measure each against was needed. This means, that although they occupy the same amount of space, their weight is definitely different. If you take a block of sandstone that is 2 inches by 2 inches and weigh it, then take a block of marble that is 2 inches by 2 inches and weigh it you will find that the marble far out weights the sand stone. You could very easily put a pound of gold into your pocket and walk away with it but try and put a pound of feathers into your pocket. An extreme example of this is the difference in volume of a pound of feathers and a pound of gold. What specific gravity is, is the mass of a solid in relationship to its weight. What is required to make this measurement is a weight scale, and the list of the different minerals SPECIFIC GRAVITIES. ![]() In the method we use to How to Find and Determine Specific Gravity of Rocks (some call it Specific Density because they don’t know better!), we’ll use simple equipment.
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