An investigation into the leaching behaviour of copper
cine to copper ratio was 81. However, further investigation established the optimum leaching conditions as being pH 11 and glycine to copper ratio of 41. Under such conditions 95.0%, 91.0%, 83. 8% and 17.4% of copper was extracted after 24 h from the azurite, malachite, cuprite, and chrysocolla mineral specimens respectively.