The Federal Reserve has the largest private gold reserve on the planet. They use that gold to facilitate loans, meaning, they loan the gold out. I imagine that some of their biggest loans are coming due.
Gold is the collateral, the only real collateral, that the Federal Reserve has. They have 14k tonnes of gold they can put on loan. They loan the gold to other central banks. This so the other central banks will continue to buy bonds, for they know that the gold is a good hedge if the bonds collapse.
The Federal Reserve prints money and pays off the foreign central banks that buy Treasurie bonds. They also pay off the Private Dealers who are helping with the fiat ponzi scheme. The Private Dealers go along with it because the Federal Reserve bails out there faulty loans. The Private Dealers also short the precious metals in coordination, which not only lowers the price for when the Federal Reserve's loans come due, but offers for a good investment opportunity.
The President's Working Group on Financial Markets could also short precious metals. The Federal Reserve by proxy has many tools to manipulate the system. They use them all with coercion, because fights will go on as long as they have to.