Hint
Eagle River!
https://viewer.nationalmap.gov/advanced-viewer/?p=default&b=base1&q=58.592777777778%20-134.86277777778&l=13
Now the Herbert and Eagle Rivers are very near each other and they have had years ago good gold showings at and around Eagle River.
The old Morningstar mine and probably others long gone by the wayside from the oldtimers.
You have too poke around but its a good map and it shows what looks like muskeg or swampy areas. Must be from all the water melting from the Herbert glacier.
And yes the more splays or offshoots they find is more gold in the 43-101.