Excalibur Resources Ltd. is pleased to announce that it has signed a second Addendum to the September 22, 2010 Joint Venture Agreement whereby it will increase its ownership in the 49% owned subsidiary Minera Catanava S.A. de C.V. in Pinos, Zacatecas, Mexico by acquiring an 11% stake from the 51% of the common shares held by its partner Minera Apolo S.A. de C.V. for US$1,000,000 and a 2% Net Smelter Return royalty on anything produced in the Pinos District, excluding production from the existing Catanava area with the following conditions. Excalibur will make the cash payments in four installments of US$250,000 over 4 years after Catanava reaches full production of three shifts per day or after reaching production of at least 100 tpd, whichever comes first. Each of MASA and Excalibur will retain two of the four seats on the Board of Directors of Catanava and MASA will be represented with one seat of the five seats on the Board of Directors of Excalibur.