May 06 I was on solo trip on east end of Sturgeon lk. I stopped at island campsite and found this brass plaque on birch tree near the waters edge.

In Memory of Brett
His soul is with God
But his heart is here
1959-1991

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I think there are probably many memorials/plaques scattered thru the area.
I would hope no one decides that since the sites are not occupied that there souvenirs/ booty rather than tributes to loved ones lost.

In my mind it adds to the mystique of the wilderness.