What You Should Know About Inflation…“Shows that inflation is always an increase in the supply of money, which results in price inflation…”
http://mises.org/hazlitt/hazlittbib.asp
if you cant use the term in this context in this post , post elsewhere
In MES, Rothbard defines inflation on page 990 note 106. His definition of inflation excludes increases in the stock of specie (gold and silver).
You are right that gold and silver have nonmonetary utility. People use these metals to make jewelry. When the supply of gold and silver increases due to mining, some people benefit because of the nonmonetary utility the metals have. These people are those who appreciate jewelry. However, regarding monetary issues, the increase causes no net social effect, and the only people who obtain wealth from gold mining are the mining company owners, employees, stockholders, etc. Likewise, the only people who gain from issuance of new fiat currency are those who spend it before it causes a general fall in the purchasing power of money.