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Experimental Study on the Leaching of Gold from Greenstone 1
Author(s) -
Yushan Liu,
Guilan Zhang,
Jun Tian
Publication year - 1993
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.1993.mp6002008.x
Subject(s) - leaching (pedology) , mineral redox buffer , chloride , fugacity , chemistry , oxygen , metallurgy , inorganic chemistry , geology , materials science , soil science , organic chemistry , soil water
Experiments were conducted on the leaching of gold from greenstone by chloride solution under the temperature of 200‐550°C and the pressure of 60 MPa. During part of the experiments, the oxygen fugacity was controlled. The results show that the leaching rate of gold is related to temperature, composition of the solution, pH and oxygen fugacity. In the experiment with oxidative acidic solution, the leaching rate was up to 50% or more. It is known that the leaching of gold is restricted by the reaction in which the gold is dissolved from the rock to form gold chloride complex. Therefore, the authors hold that the acidic chloride solution derived from granite magma has caused the remobilization‐migration of gold from greenstone and its enrichment into ore.