You are right on, about the date....and it is nice shape. It was minted by the Bureau of Revenue. (that is one of the Chinese characters on the reverse side.) A common coin, but not in Deadwood. Good find.
Nice coin, glad you got out to hunt. I hope to live in Deadwood some day, it is a great place. My wife Margie, and I get up there at least 1 or 2 times a year to shoot in a Fast Draw contest.