Carnaby Resources (ASX:CNB) has announced a new copper discovery, but some HotCopper users were skeptical of the claims on Monday. To be sure, shares dropped -4% to 47.5cps – but that comes in the context of a Monday trading session seeing the ASX200 down -2% out the gate. Carnaby’s new reported copper discovery is located in Mt. Isa, QLD, at the Greater Duchess Copper Gold play. A single assay result – 10m @ 1.63% copper – appears to back up what is otherwise an electromagnetic area of interest. Outcropping samples hit with a scanner returned grades of nearly 36% copper but given outcrop samp…