Entry in progress—B.P.
   
InvestorWords.com
mint ratio
The price of an ounce of gold divided by the price of an ounce of silver.
 
Investopedia
What Does Mint Ratio Mean?
1. The price of an ounce of gold divided by the price of an ounce of silver. The mint ratio aims to examine the relationship between gold and silver prices.
2. A fixed rate of exchange for gold and silver.
 
Google Books
A Treatise on Political Economy;
or The production, distribution, and consumption of wealth
By Jean Baptiste Say
Boston, MA: Wells and Lilly
1821
Pg. 288:
Gold bullion in the English market is now to silver bullion in the ratio of about 1 to 15 1/2, although the mint ration is still 1 to 15 1/14.
 
Google Books
Report of James W. Taylor : on the mineral resources of the United States east of the Rocky Mountains, [1867].
By James W, Taylor; United States. Dept. of the Treasury.
Washington, DC: U.S. Government Printing Office
1868
Pg. 625:
Simplest, and probably most convenient, mint ratio of gold to silver, 1 to 1; present United States mint ratio of gold to fractional silver, 14.88 to 1; United States mint ratio of gold to silver dollar, (circulation limited because overvalued,) 16 to 1;...