Manhattan Gold Mine Western Mining History
By 1973, more than 200,000 tons of ore grading opt gold had been delineated and 6500 tons of it was mined and heapleached later that year, with poor recovery due to the coarseness of the gold. Continued drilling in 1974 and 1975 defined more ore in the East and West pit areas increasing the proven reserves to more than 400,000 tons