n the United States, the term "stone" is not a commonly used unit of measurement for weight or mass in everyday contexts. Instead, the United States primarily uses pounds (lbs) to measure weight. One pound is equal to approximately 0.0714 stones.
However, the "stone" is a traditional unit of weight used more commonly in the United Kingdom and some other countries, but it is not part of the standard metric system.
1 stone (UK) = 14 pounds (lbs)
So, when you encounter the term "stone" in the context of weight or mass in the United States, it's typically used informally or in specialized contexts where individuals may be familiar with this unit of measurement due to cultural or international exposure.
The "ton assay" or "ton assay UK" typically refers to the assay ton, a unit of measurement used in the mining industry to express the amount of valuable material contained in a quantity of ore. This unit of measurement is used similarly in both the United States and the United Kingdom.
An assay ton is defined as 29.1667 grams (or approximately 1.04 ounces) of ore material. It is a standardized sample size used for analyzing the composition of ore and determining the percentage of valuable minerals or metals present within it.
Miners and metallurgists use assay tons to assess the quality and economic potential of ore deposits. By analyzing a sample equivalent to one assay ton, they can estimate the likely yield of valuable minerals from a larger quantity of ore.
So, "ton assay UK" refers to the assay ton measurement used in the United Kingdom, which is the same as the assay ton used in the United States and other mining contexts.