FIELD TESTING FOR GOLD AND SILVER. PROSPECTOR'S OUTFIT.

FIELD TESTING FOR GOLD AND SILVER.

PROSPECTOR'S OUTFIT.

Some matches, salt, soap, and towel. 22 single shot rifle (short, long, and extra long cartridges). The rifle alluded to can either be used with a short cartridge to shoot birds, rabbits, etc., or it will kill deer
with the extra long cartridge ; therefore the rifle means fresh meat to the prospector. In starting out his pack weighs about 50 Ibs., coming back it will weigh some 16 Ibs. Some oatmeal may advantageously be substituted for part of the flour for the evening meal. If the prospector can stand the weight, he will probably add sugar, but every ounce counts. With this light outfit the prospector, after locating some
place, will come back to it with a larger outfit and more food, and do his work of opening the claim to see what it is like. All the testing he can do with this outfit is to crush up any ore he finds on a rock with his poll-pick and pan it with his horn. He can easily take enough of his testing outfit in his pocket to test the concentrates with blow-pipe and cupellation. If he has no horn he will use a plate for panning, after burning off the grease. If the prospector is in a placer country, he will substitute
a light shovel and a pan for the poll-pick and horn. In the first-mentioned case, where a prospector has a canoe or pack horse, in addition to things above mentioned, he will have a larger " A " tent, a shovel, the outfit for testing, above enumerated, or at least a pan, a mortar and pestle and a sieve, a frying pan, some sugar, beans, bacon, and a larger supply of eatables generally.

USEFUL INFORMATION.

A ton of broken quartz measures about 20 cubic feet. The area of a circle is 07854 (diameter)
2. Ratio of area to circumference is as its radius is to 2.
An acre is 43,560 square feet.
A troy pound = 0*822857 avoirdupois lbs. = 5,760 grains.
A troy ounce = 480 grains.
An avoirdupois ounce = 437 '5 grains.
An avoirdupois pound = 7,000 grains.
A long ton is 2,240 Ibs. avoirdupois.
A short ton, 2,000 Ibs., or 29,1661 troy oz.
1,000 feet (board measure) of dry white pine = 4,000 Ibs.
1,000 feet (board measure) of green white pine = 6,000 Ibs.
One cord of seasoned wood = 128 cubic feet.
One miner's inch = 2,159 cubic feet per twenty-four flours = 0*025 cubic feet per second.
1 metre = 3*28 feet.
1 gramme = 15*43 grains.
An " assay ton" (2,000 Ibs. ton) = 29166 grammes, or 450*1 grains.
Vein with 2 inches solid galena has Ij tons in every
6 by 6 feet of vein.

TABLE OF WEIGHTS OF VARIOUS SUBSTANCES.

Weights of Placer Ground.

1 cubic foot of dry loose loam weighs 72 to 80 Ibs. packed 90 to 100
wet loose 66 to 68 packed 85 to 95
fine sand dry 100 to 117 wet 82 to 90

1 cubic foot of ordinary gravel, free from cement, and containing no
heavy boulders (dry) weighs 90 to 100
The same (wet) 80 to 90
1 cubic foot filled with boulders not over
6 inches in diameter (dry) weighs 95 to 105
The same (wet) 85 to 95

1 cubic inch of water weighs *036 foot 62-5 yard 1687'5

Moving Power of Water.

16 feet per minute begins to wear away fine clay.
30 just lifts fine sand.
39 lifts sand as coarse as linseed.
45 moves fine gravel.
120 inch pebbles.
200 pebbles as large as eggs.
320 boulders 3 to 4 inches thick.
400 6 to 8 600 12 to 18 Cubic Yards of Dirt which may be washed per Day
(Ten Hours) per Man.

Cleaning Gold Nuggets. Boil in water, and afterwards
wash with alum water ; then boil with hydrochloric
acid and salt and water. While gold is hot, wash with hot
water, then put in strong ammonia and let it stand in it
for a few hours.

Taken from the PDF book
FIELD TESTING FOR GOLD AND SILVER
1911