Grasberg mine in Indonesia (Credit: Freeport) Copper prices jumped Wednesday after Freeport-McMoRan (NYSE: FCX) declared force majeure on contracted supplies from its Grasberg Block Cave mine in Indonesia.Three-month futures traded above $10,496 per ton ($4.7710 per lb.) on the CME, up 2.74% for the day. In London, copper for delivery in three months rose as much as 2% to $10,172 a ton on the London Metal Exchange, the highest level in more than 15 months. Click on chart for live prices.Freeport’s shares fe ...