First Majestic Silver Corp. (AG) is trading 4.7% down at $15.68 today. - The company announced the definitive agreement to sell its San Martin silver mine for $90 million, a strategic move to optimize its asset portfolio. - The downward price action also coincides with weaker silver prices and investor caution ahead of the release of the FOMC minutes. - The San Martin mine has been inactive since 2019.