here is what I found on another web site:
From Charlebois Kenneth
Placer Gold found in Ogantz River.
Near Ralph, MI placer gold in Ford River and some of it's tributary creeks.
Most of the creeks flowing into the Yellow Dog and Salmon Trout have some gold.
From David Payant AKA MadDog
There are gold deposits in Michigan's Upper Peninsula. Marquette County has one closed mine, Roper's, located north of the City of Ishpeming. Allegedly, there are gold bearing formations near Rocking Chair Lakes, near the Mulligan Plains. The Longyear Corporation tried to block making a wilderness area there because they claim it has potential for a big gold strike. I have heard of placer gold in Bushy Creek, a tributary of the the Yellow Dog River. Placer gold has been found in the Yellow Dog Plains, south of the AAA road. The Marquette County Planning Department has a map of the sites. Two failed mines are locate off Gold Mine Road. The road starts at the ghost town of Birch which is on County Road 550. I have located one of the these mines and a test pit. Allegedly, the gold is found in a association with silver and copper. There is a legend about two lost silver deposits. One was found by an old prospector who showed the nuggets to several people and then died in a fire in a L'anse boarding house. He claimed the find was from the Huron Mountains. Another deposit was found near the Holyoke Mine (silver), north of the Dead River. That depost was simply lost and the prospector forgot how to go back to the site.
From Johnny Banjo
I'm in southeast lower Michigan and I've found nearly all the streams in Washtenaw, Livingston, Lenawee, Jackson, and Oakland Counties show color in minor amounts.
I usually get a couple dozen specs and flakes per sluice load. I also found one nice "soup-bean" size copper and gold nugget in the Huron river in Wasthenaw County ten minutes west of Ann Arbor.
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...in addition there are black sands on some Great Lakes beaches...try that...really impressive gold has come out of beaches up on the Michigan shore of Lake Superior. ( I have seen the youtube videos of prospectors there myself!)
Good luck searching and be sure to at least PM me with any successful results you get from this info. My folks live up in Cheyboygan so I am particularly interested in learning about any gold in the northern part of the lower penninsula. Thanks!!