All prices are in US$ per troy oz and are provided for information purposes only.

Daily prices are the first prices in each time zone.

Monthly average prices are the averages of all prices set in all time zones during the month, calculated as follows:

The sum of the daily prices is divided by the number of prices set during that day to give a daily average
The daily averages are added together and divided by the number of days on which prices were set during the month.