Hola amigo and thank you for your reply,
<You posted>
Some believe that Pactola Dam has covered the original mouth of Jenny Gulch. On the west end of Pactola Reservoir is Silver city. From Siver City Rd - Follow Forest service rt 671 / Sunnyside Gulch rd to Jenny Gulch Rd - OR - Silver City Rd North until it T's - to the left is Forest rt 671 / Jenny Gulch Rd, to the right is Silver City Rd
Yes this is one theory, however "Jenny gulch" may or may not be the same one which connects to what is today Pactola, and Standoff Bar is supposed to be at least a mile up the canyon from either the mouth of the canyon or Prof Jenny's mine. So it would not be under water. Even if it were under the lake, with a hookah and dredge the mine could be worked today.
One of the letters (or diary) written by one of the original owners described the mine as being "either Jennys Gulch or Spring Creek" which further confuses this matter. Spring creek is miles away from what we call Jenny Gulch today (near Silver City) and has no part known as Jenny Gulch. A letter written by a soldier who was with Crook on the campaign after the Little Bighorn mentioned passing Standoff Bar and seems to place it on Spring Creek, but is not specific enough to be sure.
Pactola is central to several other lost mine legends of the area including several silver mines, which as far as I can determine are not under the reservoir. Rainbow canyon is key to locating one of them, and I have not been able to ID this canyon yet.
What I suspect is that the canyon where Standoff is located is not known today by the same name, as many have been renamed since the 1876 gold rush including Beaver creek, Amphibious creek, etc. The fact that there was a 'standoff' at the mine in the early days of the rush suggests (to me) that the crowd of rushers came through there, not that this is a strong clue but we know that the 'crowd' first gathered at Custer, then Spring creek, and so on to each new site as the discoveries were made so if we had any diaries of the rushers, it might help pin down exactly which canyon was "Jenny gulch or Spring creek" at that time.
Thank you again, I look forward to your replies.
Oroblanco