To date, no suitable recovery method was found due primarily to the partial oxidation of the principally sulfide deposit.
But now they have the expert advice of Robert Garcia! Look how that worked out at Santa Elena.
BTW, I am still curious what they are going to do with each batch of spent ore. Dump it into the ravine next to the process area? Galena and arsenopyrite are ores of lead and arsenic. Throw in a little cyanide, and you've got some pretty nasty waste products to dispose of. Given the environmental problems at Santa Elena, you can bet that the Mexican authorities are watching.
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