The project now contains 423 million indicated tonnes grading 0.41 gram gold per tonne, 0.22% copper, 4.6 grams silver and 41 parts per million molybdenum.
A New York-based company is in talks to buy the 847-megawatt San Juan Generating Station for $1, after four of its five owners decided to shut it down.
Mining stopped on March 8, when members of the Asociación Obrera Minera Argentina (AOMA) downed tools, and processing activities have now also ceased following the exhaustion of surface stockpiles.
The train had to be deliberately derailed after it reached speeds of 162 km/hour (101 mph), destroying two locomotives, 245 ore cars and 2 km (1.2 miles) of track.