For Metal Bulletin's assessed prices, such as cobalt and ferro-vanadium, for example, what this means in practice is that the final day of 2014 on which prices will be assessed by a journalist will be December 24.
That price will then be rolled over on December 26 and December 31.
Therefore there will be nine dates in December (3, 5, 10, 12, 17, 19, 24, 26, 31) against which assessed prices such as cobalt and ferro-vanadium are published.
But the final two quotes of the year (December 26 and December 31) will be rolled over from the assessment of December 24.
Metal Bulletin adopted this method of pricing over the holidays to ensure that prices were available against as many days per year as possible following consultation with market participants.
Our alumina, managanese ore and ferro-chrome indices, by contrast, will be calculated based on data collected in the weeks commencing December 22 and December 29, though they will not be published till the weeks of December 29 and January 5 respectively.