Translations:Adventist Youth Honors Answer Book/Recreation/Gold Prospecting - Advanced/3/en

2. Describe the following types of prospecting equipment.

a. Sluice box: A sluice box is a shallow box into which ore is shovelled. The box features several transverse barriers along the bottom called riffles to trap the heavier gold particles as water washes them and the other material along the box.
b. Rocker box: Similar in principle to a sluice is a rocker, a cradle-like piece of equipment that could be rocked to sift sands through screens, which was introduced by Chinese miners in British Columbia and Australia, where the practice was referred to as "rocking the golden baby".
c. High banker
d. Bucket dredge
e. Suction dredge
f. Dry washer
g. Trommel: A trommel is composed of a slightly-inclined rotating metal tube (the 'scrubber section') with a screen at its discharge end. Lifter bars, sometimes in the form of bolted in angle iron, are attached to the interior of the scrubber section. The ore is fed into the elevated end of the trommel. Water, often under pressure, is provided to the scrubber and screen sections and the combination of water and mechanical action frees the valuable minerals from the ore. The mineral bearing ore that passes through the screen is then further concentrated in smaller devices such as sluices and jigs. The larger pieces of ore that do not pass through the screen can be carried to a waste stack by a conveyor.
h. Beach box
i. Metal detector: A metal detector is an electronic device designed to detect metals, ferrous and non-ferrous. They range in price from $100 to $3,000 dollars and normally will locate small nuggets up to about 6" deep depending on the quality of the metal detector. They will locate your lost keys or watch, lost in the sand at the beach (very useful), but from experience, most of the gold you find is smaller than nuggets. Considering that most of the gold in the world is in gold ore (less than 10 oz per ton) and requires heat or chemicals to extract, the metal detector is normally not a wise tool for prospecting unless you have a lot of gold. The device was invented to locate old coins.
j. Jig
k. Shaker table