Gold Resource's Arista underground mine is located at the Company's El Aguila Project in the southern state of Oaxaca, Mexico. The El Aguila Project mineralization occurs as structurally-controlled epithermal deposits in veins and stockwork zones consisting of concentrations of sulfides containing gold, silver, copper, lead and zinc, associated with gangue minerals such as quartz, calcite, and other minor elements.
Development of the Arista mine began in 2009, and initial production from the deposit began in March 2011. Ore is trucked approximately 2 kilometers to the Aguila mill where it is processed into three differential concentrates: a copper/gold; a lead/silver; and a zinc.
Since the initial discovery of the Arista and Baja veins in 2007, multiple additional en echelon veins have been discovered, many which have been mined or will be mined in the future. The Arista deposit is currently "open" in both strike and at depth, and consists of two distinct vein systems – the Arista and the Switchback. The Company continues to drill the extensions of the Arista deposit to extend the mine life.