Where can you get your sand assayed?

[Countryboy]

Where do you send your samples to get assayed?

I am in Central Ohio, and our gold is believed to have been brought here during the ice age. In some streams, I can find a fair amount of black sand. Some of our black sand is magnetic, and some is not.

I have read that the gold telluride compound Calaverite has been found in Ontario, which is where the Ohio gold comes from. Logic tells me that if the glaciers brought gold from Ontario, they also could have brought Ontario calaverite too.

I have a bucket half full of heavy black sand. I've ran it through my spiral wheel to get as much gold out as I could, but I have still saved the sand.

Where can I send a sand sample to get it assayed? I tried searching on here, but couldn't find anything.