I don't know anything about Death Valley Scotty.
I used to be ambivalent, even doubtful about the Pegleg story, but changed my opinion when I found out that a number of other searchers have found black-stained gold nuggets in the same general vicinity of Pegleg's apparent discovery. This indicated to me that the unusual nuggets are real and sporadically dispersed in that desert. This fact adds much credence to Smith's story - enough for me to consider it "probable". Also, an excellent book, Golden Mirages, by Philip A. Bailey, provided much verifiable history about Smith and that desert country. If that part of the world was accessible to me, it'd be a possibility for an interesting winter project.
the reason for the black coating on peglegs gold is a manganese coating...matter of fact there is a source for some black coated nuggets locally. i have seen one of them...the old guy had them since the 50's and the coating started to wear through in places....another guy has found some magnetic nuggets not far from morristown ...10 miles southeast of wickenburg...the gold has just enough iron alloyed with it to make it stick to a magnet but you wouldn't know it to look at the gold