I found this huge mangled iron thing. Same spot I have found weird metal bits in. It appears to have a large handle, with mineralization. It might have a copper shaft in the middle with the handle coming from it. I found it in a gravel bar.
Thanks for the responses. I guess in hindsight identification might be hard due to the corroded nature of it. I can probably salvage the copper, but the iron is hopeless. I am not deterred, I will still continue to search. It could very well be a pump, but I just can't tell. Thanks again!