Question 1

What is an assay ton?

Accepted Answer

An assay ton is 29.166 grams - a unit used in assaying precious metals. Designed so milligrams of gold per assay ton = troy oz per short ton.

Question 2

Why use assay tons?

Accepted Answer

Makes calculations convenient: if 1 mg of gold is found in an assay ton of ore, the ore contains 1 troy oz per short ton of ore.

Question 3

Is there a difference between mass and weight?

Accepted Answer

Yes! Mass (kg) is amount of matter, constant everywhere. Weight (newtons or pounds-force) is gravitational force on mass, varies by location.

Question 4

Why do jewelry and precious metals use different units?

Accepted Answer

Troy system (troy ounces, pennyweights) has been used for precious metals since the Middle Ages. 1 troy oz = 31.1g vs 1 regular oz = 28.35g.

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