Ann: Doubling of Copper Resource at Walford Creek, page-15

Fair enough, Kookaburra. How about putting it this way. Underground rocks and ore bodies are solid and should remain that way, unless they are exposed to >1000 degree which causes them to liquify. However, if the chemistry is just right, certain metals can dissolve from an ore body at lower temperatures. The hydrothermal flow is a hot solution with a chemistry which is capable of dissolving metals. So over millions of years the metals are moved from the original orebody as a "hot toothpaste". At first the flow described by AML appears to have flowed horizontal from aan original orebody, then when it hit the wall of impermeable rock, the flow moved vertically to be deposited in the PY3 and PY1 layers. Importantly, the high concentration of metal sulfides in the PY3 and PY1 layers reflects the fact that there was a lack of oxygen in the hydrothermal flow and this allowed the flow to carry the range of metals. Actually, when AML starts to process its ore, it will probably use a process with chemical conditions of the hydrothermal flow, such as acid and heat, in order to release (ie dissolve) the key metals. You asked about the location of the original ore body - it may have completely dissolved by now, or it may be sitting their waiting for AML to find it. This understanding is my best interpretation, but you don't have to accept it and others are welcome to give their interpretation. Whatever, AML has a massive, rich deposit and the management is kicking great goals. We just need to go with their flow.