CALCULATING THE APPROXIMATE WEIGHT OF GOLD IN QUARTZ REEF ROCK.
I. Dry weight of the quartz and gold specimen =[A]
II. Weight of the displaced water =[B]
III. s.g.[specific gravity] of quartz = 2.65
IV. Weight of the displaced water x the s.g. =[C] assumed weight of the specimen if it was 100% quartz
V. A – C = approx. weight of the gold in the specimen
1. Tare [zero] your scales, weigh the DRY, clean specimen rock [record this = A]
2. Put sufficient water in a container [glass, or clear plastic] that would cover the rock. …. Or use a fancy graduated laboratory beaker.
3. Use a permanent thin line marker on the outside of the container to mark the water level.
4. Put the specimen in the water
5. Mark the new water level on the container where the water level is displaced to
6. Take the specimen out of the water, and let as much water drip off the specimen back into the water container as this can make a significant result to your calculation.
7. Put the container of water on your sales and THEN TARE the scales [check the readout of the scales reads 0.00]
8. Now add water up to the marked displacement line.
9. Record the weight of the water [ the weight of the displaced water = B]
10. Calculate: C = (B x 2.65)
11. Calculate A – C = approximate weight of gold in the specimen.
The calculation becomes less accurate with the mass of other materials in a specimen. The only true measure is by dollying the rock.