Some past answers to question about pre-Columbian American metalworking have included (links to) pictures of examples. Some pictures provided by u/Reedstilt and myself in:

• https://www.reddit.com/r/AskHistorians/comments/1gnhzs/is_there_much_evidence_of_precolumbian/

• https://www.reddit.com/r/AskHistorians/comments/9rjcut/the_native_americans_knew_smithing_but_they/

Not all of these examples are bronze, but some are. Both arsenic bronze and tin bronze were used; most or all of the bronze examples in the replies linked above don't specify what alloy was used.