Australian copper stocks falls on weak commodity prices

** Australian copper miners fall on the day, adding to the broader mining sub-index's .AXMM 2.2% decline

** Copper prices fell to a 2-1/2 month low before trimming some losses amid uncertainty over the outcome of the US midterm elections

** Shares of Sandfire Resources SFR.AX fall 3.1%, on track for their worst day in nearly two weeks if trends hold

** Australia-listed shares of Capstone Copper fall as much as 4.5%, marking their lowest level since end of March