Greek Copper Hoard Discovered

Okay - I don't get it - were the weapons made out of copper (see first sentence of article) - or out of bronze (see title of article)? It makes a big difference as far as historicity is concerned! Prehistoric bronze hoard found off Greek beach Thu Dec 11, 7:46 am ET ATHENS, Greece – Authorities say a hoard of 4,500-year-old copper weapons recovered off a northern beach is the largest of its kind ever found in Greece. A Culture Ministry statement says the discovery includes at least 110 ax and hammer heads, but several more should be extracted from compacted masses of corroded metal. The ministry says they were probably buried at a time of unrest or war. The hoard would have represented a fortune at the time. Thursday's statement says there were no traces of a shipwreck. The site was probably a coastal area flooded by rising sea levels. The tools were discovered near the village of Mesi, 500 miles (800 kilometers) northeast of Athens. Archaeologists recovered it from a depth of 3 1/2 yards (meters).