Zoomed in on the shiniest thing I could find in your lot... I'd assume this is conglomerate, which would contain chunks of other rocks all mixed together in an ancient riverbed and cemented over time/pressure. Can't tell what it is from the picture, it'd be great if it were gold, but it'd be more likely to be pyrite or mica lending any shininess. The melted down "coins" are likely just iron deposits or other smaller rocks mixed in the stone. Can't tell if any of it is man-made concrete or conglomerate stone. Here's info on conglomerate so you can compare.
Not sure if this is a joke or not... but YES mica comes in various shades, and pyrite is a famous "fool". I still haven't taught myself to tell the difference between authentic conglomerate and concrete. But if you are REALLY finding actual coin bits, perhaps they are simply coins dropped during a construction project... UNLESS some strange person decided to hide their stash in cement... sorta like Mack the Knife "hiding" a "friend" after "meeting him"...
Chunks of coins. Some one or some thing had quite a time grinding them up. Maybe an alien spaceship used a 19th century bank as a launch pad--all that heat and pressure.
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