All kinds of handy knots
Equipment Information
Prospecting Definitions
Precious Metal Calculator from Dendritics
Fill in the weight of your gold and the currency you would love to cash
it in for, click "Calculate Value," and you get the absolute current going
price for it.
Good Stuff To Know
I figured out how to calculate how much gold is in a specimen with quartz.

I found this video which explains how to measure the specimen in water.
Then the formula is pretty easy once you know the dry and wet weights of the specimen:

W = wet specimen (weight when suspended in water as per the video)

D = dry specimen on scale

Just plug in your 2 values in this formula:

(W x 3.07) - (D x 1.91)  = wt of gold in quartz/gold specimen

I use grams but you can use ounce or grains, works the same.   The 3.07 and 1.91 values are derived from the
specific gravity of gold and quartz in a longer formula. I looked it all up to prove it really works

"A Guide to Metal Detecting for Beginners"

Thanks for the link Lauren